Merge tag 'nds32-for-linus-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/greentime/linux

Pull nds32 architecture support from Greentime Hu:
 "This contains the core nds32 Linux port (including interrupt
  controller driver and timer driver), which has been through seven
  rounds of review on mailing list.

  It is able to boot to shell and passes most LTP-2017 testsuites in
  nds32 AE3XX platform:

    Total Tests: 1901
    Total Skipped Tests: 618
    Total Failures: 78"

Reviewed-by: Arnd Bergmann <arnd@arndb.de>

* tag 'nds32-for-linus-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/greentime/linux: (44 commits)
  nds32: To use the generic dump_stack()
  nds32: fix building failed if using elf toolchain.
  nios2: add ioremap_nocache declaration before include asm-generic/io.h.
  nds32: fix building failed if using older version gcc.
  dt-bindings: timer: Add andestech atcpit100 timer binding doc
  clocksource/drivers/atcpit100: VDSO support
  clocksource/drivers/atcpit100: Add andestech atcpit100 timer
  net: faraday add nds32 support.
  irqchip: Andestech Internal Vector Interrupt Controller driver
  dt-bindings: interrupt-controller: Andestech Internal Vector Interrupt Controller
  dt-bindings: nds32 SoC Bindings
  dt-bindings: nds32 L2 cache controller Bindings
  dt-bindings: nds32 CPU Bindings
  MAINTAINERS: Add nds32
  nds32: Build infrastructure
  nds32: defconfig
  nds32: Miscellaneous header files
  nds32: Device tree support
  nds32: Generic timers support
  nds32: Loadable modules
  ...

130 files changed, 11864 insertions, 21 deletions

diff --git a/Documentation/devicetree/bindings/interrupt-controller/andestech,ativic32.txt b/Documentation/devicetree/bindings/interrupt-controller/andestech,ativic32.txt
new file mode 100644
index 0000000..f4b4193
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/andestech,ativic32.txt
@@ -0,0 +1,19 @@
+* Andestech Internal Vector Interrupt Controller
+
+The Internal Vector Interrupt Controller (IVIC) is a basic interrupt controller
+suitable for a simpler SoC platform not requiring a more sophisticated and
+bigger External Vector Interrupt Controller.
+
+
+Main node required properties:
+
+- compatible : should at least contain  "andestech,ativic32".
+- interrupt-controller : Identifies the node as an interrupt controller
+- #interrupt-cells: 1 cells and refer to interrupt-controller/interrupts
+
+Examples:
+	intc: interrupt-controller {
+		compatible = "andestech,ativic32";
+		#interrupt-cells = <1>;
+		interrupt-controller;
+	};
diff --git a/Documentation/devicetree/bindings/nds32/andestech-boards b/Documentation/devicetree/bindings/nds32/andestech-boards
new file mode 100644
index 0000000..f5d7569
--- /dev/null
+++ b/Documentation/devicetree/bindings/nds32/andestech-boards
@@ -0,0 +1,40 @@
+Andestech(nds32) AE3XX Platform
+-----------------------------------------------------------------------------
+The AE3XX prototype demonstrates the AE3XX example platform on the FPGA. It
+is composed of one Andestech(nds32) processor and AE3XX.
+
+Required properties (in root node):
+- compatible = "andestech,ae3xx";
+
+Example:
+/dts-v1/;
+/ {
+	compatible = "andestech,ae3xx";
+	#address-cells = <1>;
+	#size-cells = <1>;
+	interrupt-parent = <&intc>;
+};
+
+Andestech(nds32) AG101P Platform
+-----------------------------------------------------------------------------
+AG101P is a generic SoC Platform IP that works with any of Andestech(nds32)
+processors to provide a cost-effective and high performance solution for
+majority of embedded systems in variety of application domains. Users may
+simply attach their IP on one of the system buses together with certain glue
+logics to complete a SoC solution for a specific application. With
+comprehensive simulation and design environments, users may evaluate the
+system performance of their applications and track bugs of their designs
+efficiently. The optional hardware development platform further provides real
+system environment for early prototyping and software/hardware co-development.
+
+Required properties (in root node):
+	compatible = "andestech,ag101p";
+
+Example:
+/dts-v1/;
+/ {
+	compatible = "andestech,ag101p";
+	#address-cells = <1>;
+	#size-cells = <1>;
+	interrupt-parent = <&intc>;
+};
diff --git a/Documentation/devicetree/bindings/nds32/atl2c.txt b/Documentation/devicetree/bindings/nds32/atl2c.txt
new file mode 100644
index 0000000..da8ab8e
--- /dev/null
+++ b/Documentation/devicetree/bindings/nds32/atl2c.txt
@@ -0,0 +1,28 @@
+* Andestech L2 cache Controller
+
+The level-2 cache controller plays an important role in reducing memory latency
+for high performance systems, such as thoese designs with AndesCore processors.
+Level-2 cache controller in general enhances overall system performance
+signigicantly and the system power consumption might be reduced as well by
+reducing DRAM accesses.
+
+This binding specifies what properties must be available in the device tree
+representation of an Andestech L2 cache controller.
+
+Required properties:
+	- compatible:
+		Usage: required
+		Value type: <string>
+		Definition: "andestech,atl2c"
+	- reg : Physical base address and size of cache controller's memory mapped
+	- cache-unified : Specifies the cache is a unified cache.
+	- cache-level : Should be set to 2 for a level 2 cache.
+
+* Example
+
+	cache-controller@e0500000 {
+		compatible = "andestech,atl2c";
+		reg = <0xe0500000 0x1000>;
+		cache-unified;
+		cache-level = <2>;
+	};
diff --git a/Documentation/devicetree/bindings/nds32/cpus.txt b/Documentation/devicetree/bindings/nds32/cpus.txt
new file mode 100644
index 0000000..6f9e311
--- /dev/null
+++ b/Documentation/devicetree/bindings/nds32/cpus.txt
@@ -0,0 +1,38 @@
+* Andestech Processor Binding
+
+This binding specifies what properties must be available in the device tree
+representation of a Andestech Processor Core, which is the root node in the
+tree.
+
+Required properties:
+
+	- compatible:
+		Usage: required
+		Value type: <string>
+		Definition: Should be "andestech,<core_name>", "andestech,nds32v3" as fallback.
+		Must contain "andestech,nds32v3" as the most generic value, in addition to
+		one of the following identifiers for a particular CPU core:
+		"andestech,n13"
+		"andestech,n15"
+		"andestech,d15"
+		"andestech,n10"
+		"andestech,d10"
+	- device_type
+		Usage: required
+		Value type: <string>
+		Definition: must be "cpu"
+	- reg: Contains CPU index.
+	- clock-frequency: Contains the clock frequency for CPU, in Hz.
+
+* Examples
+
+/ {
+	cpus {
+		cpu@0 {
+			device_type = "cpu";
+			compatible = "andestech,n13", "andestech,nds32v3";
+			reg = <0x0>;
+			clock-frequency = <60000000>
+		};
+	};
+};
diff --git a/Documentation/devicetree/bindings/timer/andestech,atcpit100-timer.txt b/Documentation/devicetree/bindings/timer/andestech,atcpit100-timer.txt
new file mode 100644
index 0000000..4c9ea59
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/andestech,atcpit100-timer.txt
@@ -0,0 +1,33 @@
+Andestech ATCPIT100 timer
+------------------------------------------------------------------
+ATCPIT100 is a generic IP block from Andes Technology, embedded in
+Andestech AE3XX platforms and other designs.
+
+This timer is a set of compact multi-function timers, which can be
+used as pulse width modulators (PWM) as well as simple timers.
+
+It supports up to 4 PIT channels. Each PIT channel is a
+multi-function timer and provide the following usage scenarios:
+One 32-bit timer
+Two 16-bit timers
+Four 8-bit timers
+One 16-bit PWM
+One 16-bit timer and one 8-bit PWM
+Two 8-bit timer and one 8-bit PWM
+
+Required properties:
+- compatible	: Should be "andestech,atcpit100"
+- reg		: Address and length of the register set
+- interrupts	: Reference to the timer interrupt
+- clocks 	: a clock to provide the tick rate for "andestech,atcpit100"
+- clock-names 	: should be "PCLK" for the peripheral clock source.
+
+Examples:
+
+timer0: timer@f0400000 {
+	compatible = "andestech,atcpit100";
+	reg = <0xf0400000 0x1000>;
+	interrupts = <2>;
+	clocks = <&apb>;
+	clock-names = "PCLK";
+};
diff --git a/MAINTAINERS b/MAINTAINERS
index 689f875..b587fd4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -870,6 +870,17 @@ X:	drivers/iio/*/adjd*
 F:	drivers/staging/iio/*/ad*
 F:	drivers/staging/iio/trigger/iio-trig-bfin-timer.c
 
+ANDES ARCHITECTURE
+M:	Greentime Hu <green.hu@gmail.com>
+M:	Vincent Chen <deanbo422@gmail.com>
+T:	git https://github.com/andestech/linux.git
+S:	Supported
+F:	arch/nds32/
+F:	Documentation/devicetree/bindings/interrupt-controller/andestech,ativic32.txt
+F:	Documentation/devicetree/bindings/nds32/
+K:	nds32
+N:	nds32
+
 ANDROID CONFIG FRAGMENTS
 M:	Rob Herring <robh@kernel.org>
 S:	Supported
diff --git a/arch/nds32/Kconfig b/arch/nds32/Kconfig
new file mode 100644
index 0000000..249f38d
--- /dev/null
+++ b/arch/nds32/Kconfig
@@ -0,0 +1,103 @@
+#
+# For a description of the syntax of this configuration file,
+# see Documentation/kbuild/kconfig-language.txt.
+#
+
+config NDS32
+        def_bool y
+	select ARCH_WANT_FRAME_POINTERS if FTRACE
+	select CLKSRC_MMIO
+	select CLONE_BACKWARDS
+	select COMMON_CLK
+	select GENERIC_ATOMIC64
+	select GENERIC_CPU_DEVICES
+	select GENERIC_CLOCKEVENTS
+	select GENERIC_IRQ_CHIP
+	select GENERIC_IRQ_SHOW
+	select GENERIC_STRNCPY_FROM_USER
+	select GENERIC_STRNLEN_USER
+	select GENERIC_TIME_VSYSCALL
+	select HANDLE_DOMAIN_IRQ
+	select HAVE_ARCH_TRACEHOOK
+	select HAVE_DEBUG_KMEMLEAK
+	select HAVE_MEMBLOCK
+	select HAVE_REGS_AND_STACK_ACCESS_API
+	select IRQ_DOMAIN
+	select LOCKDEP_SUPPORT
+	select MODULES_USE_ELF_RELA
+	select OF
+	select OF_EARLY_FLATTREE
+	select NO_BOOTMEM
+	select NO_IOPORT_MAP
+	select RTC_LIB
+	select THREAD_INFO_IN_TASK
+	help
+	  Andes(nds32) Linux support.
+
+config GENERIC_CALIBRATE_DELAY
+	def_bool y
+
+config GENERIC_CSUM
+        def_bool y
+
+config GENERIC_HWEIGHT
+        def_bool y
+
+config GENERIC_LOCKBREAK
+        def_bool y
+	depends on PREEMPT
+
+config RWSEM_GENERIC_SPINLOCK
+	def_bool y
+
+config TRACE_IRQFLAGS_SUPPORT
+	def_bool y
+
+config STACKTRACE_SUPPORT
+        def_bool y
+
+config FIX_EARLYCON_MEM
+	def_bool y
+
+config PGTABLE_LEVELS
+	default 2
+
+source "init/Kconfig"
+
+menu "System Type"
+source "arch/nds32/Kconfig.cpu"
+config NR_CPUS
+	int
+	default 1
+
+config MMU
+        def_bool y
+
+config NDS32_BUILTIN_DTB
+        string "Builtin DTB"
+        default ""
+	help
+	  User can use it to specify the dts of the SoC
+endmenu
+
+menu "Kernel Features"
+source "kernel/Kconfig.preempt"
+source "mm/Kconfig"
+source "kernel/Kconfig.hz"
+endmenu
+
+menu "Executable file formats"
+source "fs/Kconfig.binfmt"
+endmenu
+
+source "net/Kconfig"
+source "drivers/Kconfig"
+source "fs/Kconfig"
+
+menu "Kernel hacking"
+source "lib/Kconfig.debug"
+endmenu
+
+source "security/Kconfig"
+source "crypto/Kconfig"
+source "lib/Kconfig"
diff --git a/arch/nds32/Kconfig.cpu b/arch/nds32/Kconfig.cpu
new file mode 100644
index 0000000..ba44cc5
--- /dev/null
+++ b/arch/nds32/Kconfig.cpu
@@ -0,0 +1,174 @@
+comment "Processor Features"
+
+config CPU_BIG_ENDIAN
+	bool "Big endian"
+
+config CPU_LITTLE_ENDIAN
+        def_bool !CPU_BIG_ENDIAN
+
+config HWZOL
+	bool "hardware zero overhead loop support"
+	depends on CPU_D10 || CPU_D15
+	default n
+	help
+	  A set of Zero-Overhead Loop mechanism is provided to reduce the
+	  instruction fetch and execution overhead of loop-control instructions.
+	  It will save 3 registers($LB, $LC, $LE) for context saving if say Y.
+	  You don't need to save these registers if you can make sure your user
+	  program doesn't use these registers.
+
+	  If unsure, say N.
+
+config CPU_CACHE_ALIASING
+	bool "Aliasing cache"
+	depends on CPU_N10 || CPU_D10 || CPU_N13 || CPU_V3
+	default y
+	help
+	  If this CPU is using VIPT data cache and its cache way size is larger
+	  than page size, say Y. If it is using PIPT data cache, say N.
+
+	  If unsure, say Y.
+
+choice
+	prompt "minimum CPU type"
+	default CPU_V3
+	help
+	  The data cache of N15/D15 is implemented as PIPT and it will not cause
+	  the cache aliasing issue. The rest cpus(N13, N10 and D10) are
+	  implemented as VIPT data cache. It may cause the cache aliasing issue
+	  if its cache way size is larger than page size. You can specify the
+	  CPU type direcly or choose CPU_V3 if unsure.
+
+          A kernel built for N10 is able to run on N15, D15, N13, N10 or D10.
+          A kernel built for N15 is able to run on N15 or D15.
+          A kernel built for D10 is able to run on D10 or D15.
+          A kernel built for D15 is able to run on D15.
+          A kernel built for N13 is able to run on N15, N13 or D15.
+
+config CPU_N15
+	bool "AndesCore N15"
+config CPU_N13
+	bool "AndesCore N13"
+	select CPU_CACHE_ALIASING if ANDES_PAGE_SIZE_4KB
+config CPU_N10
+	bool "AndesCore N10"
+	select CPU_CACHE_ALIASING
+config CPU_D15
+	bool "AndesCore D15"
+config CPU_D10
+	bool "AndesCore D10"
+	select CPU_CACHE_ALIASING
+config CPU_V3
+	bool "AndesCore v3 compatible"
+	select CPU_CACHE_ALIASING
+endchoice
+choice
+	prompt "Paging -- page size "
+	default ANDES_PAGE_SIZE_4KB
+config  ANDES_PAGE_SIZE_4KB
+	bool "use 4KB page size"
+config  ANDES_PAGE_SIZE_8KB
+	bool "use 8KB page size"
+endchoice
+
+config CPU_ICACHE_DISABLE
+	bool "Disable I-Cache"
+	help
+	  Say Y here to disable the processor instruction cache. Unless
+	  you have a reason not to or are unsure, say N.
+
+config CPU_DCACHE_DISABLE
+	bool "Disable D-Cache"
+	help
+	  Say Y here to disable the processor data cache. Unless
+	  you have a reason not to or are unsure, say N.
+
+config CPU_DCACHE_WRITETHROUGH
+	bool "Force write through D-cache"
+	depends on !CPU_DCACHE_DISABLE
+	help
+	  Say Y here to use the data cache in writethrough mode. Unless you
+	  specifically require this or are unsure, say N.
+
+config WBNA
+	bool "WBNA"
+	default n
+	help
+	  Say Y here to enable write-back memory with no-write-allocation policy.
+
+config ALIGNMENT_TRAP
+	bool "Kernel support unaligned access handling by sw"
+	depends on PROC_FS
+	default n
+	help
+	  Andes processors cannot load/store information which is not
+	  naturally aligned on the bus, i.e., a 4 byte load must start at an
+	  address divisible by 4. On 32-bit Andes processors, these non-aligned
+	  load/store instructions will be emulated in software if you say Y
+	  here, which has a severe performance impact. With an IP-only
+	  configuration it is safe to say N, otherwise say Y.
+
+config HW_SUPPORT_UNALIGNMENT_ACCESS
+	bool "Kernel support unaligned access handling by hw"
+	depends on !ALIGNMENT_TRAP
+	default n
+	help
+	  Andes processors load/store world/half-word instructions can access
+	  unaligned memory locations without generating the Data Alignment
+	  Check exceptions. With an IP-only configuration it is safe to say N,
+	  otherwise say Y.
+
+config HIGHMEM
+	bool "High Memory Support"
+	depends on MMU && !CPU_CACHE_ALIASING
+	help
+	  The address space of Andes processors is only 4 Gigabytes large
+	  and it has to accommodate user address space, kernel address
+	  space as well as some memory mapped IO. That means that, if you
+	  have a large amount of physical memory and/or IO, not all of the
+	  memory can be "permanently mapped" by the kernel. The physical
+	  memory that is not permanently mapped is called "high memory".
+
+	  Depending on the selected kernel/user memory split, minimum
+	  vmalloc space and actual amount of RAM, you may not need this
+	  option which should result in a slightly faster kernel.
+
+	  If unsure, say N.
+
+config CACHE_L2
+	bool "Support L2 cache"
+        default y
+	help
+	  Say Y here to enable L2 cache if your SoC are integrated with L2CC.
+	  If unsure, say N.
+
+menu "Memory configuration"
+
+choice
+	prompt "Memory split"
+	depends on MMU
+	default VMSPLIT_3G_OPT
+	help
+	  Select the desired split between kernel and user memory.
+
+	  If you are not absolutely sure what you are doing, leave this
+	  option alone!
+
+	config VMSPLIT_3G
+		bool "3G/1G user/kernel split"
+	config VMSPLIT_3G_OPT
+		bool "3G/1G user/kernel split (for full 1G low memory)"
+	config VMSPLIT_2G
+		bool "2G/2G user/kernel split"
+	config VMSPLIT_1G
+		bool "1G/3G user/kernel split"
+endchoice
+
+config PAGE_OFFSET
+	hex
+	default 0x40000000 if VMSPLIT_1G
+	default 0x80000000 if VMSPLIT_2G
+	default 0xB0000000 if VMSPLIT_3G_OPT
+	default 0xC0000000
+
+endmenu
diff --git a/arch/nds32/Makefile b/arch/nds32/Makefile
new file mode 100644
index 0000000..91f933d
--- /dev/null
+++ b/arch/nds32/Makefile
@@ -0,0 +1,67 @@
+LDFLAGS_vmlinux	:= --no-undefined -X
+OBJCOPYFLAGS	:= -O binary -R .note -R .note.gnu.build-id -R .comment -S
+
+KBUILD_DEFCONFIG := defconfig
+
+comma = ,
+
+KBUILD_CFLAGS	+= $(call cc-option, -mno-sched-prolog-epilog)
+KBUILD_CFLAGS	+= -mcmodel=large
+
+KBUILD_CFLAGS	+=$(arch-y) $(tune-y)
+KBUILD_AFLAGS	+=$(arch-y) $(tune-y)
+
+#Default value
+head-y		 := arch/nds32/kernel/head.o
+textaddr-y	 := $(CONFIG_PAGE_OFFSET)+0xc000
+
+TEXTADDR := $(textaddr-y)
+
+export	TEXTADDR
+
+
+# If we have a machine-specific directory, then include it in the build.
+core-y				+= arch/nds32/kernel/ arch/nds32/mm/
+libs-y				+= arch/nds32/lib/
+LIBGCC_PATH     		:= \
+  $(shell $(CC) $(KBUILD_CFLAGS) $(KCFLAGS) -print-libgcc-file-name)
+libs-y				+= $(LIBGCC_PATH)
+
+ifneq '$(CONFIG_NDS32_BUILTIN_DTB)' '""'
+BUILTIN_DTB := y
+else
+BUILTIN_DTB := n
+endif
+
+ifdef CONFIG_CPU_LITTLE_ENDIAN
+KBUILD_CFLAGS   += $(call cc-option, -EL)
+else
+KBUILD_CFLAGS   += $(call cc-option, -EB)
+endif
+
+boot := arch/nds32/boot
+core-$(BUILTIN_DTB) += $(boot)/dts/
+
+.PHONY: FORCE
+
+Image: vmlinux
+	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
+
+
+PHONY += vdso_install
+vdso_install:
+	$(Q)$(MAKE) $(build)=arch/nds32/kernel/vdso $@
+
+prepare: vdso_prepare
+vdso_prepare: prepare0
+	$(Q)$(MAKE) $(build)=arch/nds32/kernel/vdso include/generated/vdso-offsets.h
+
+CLEAN_FILES += include/asm-nds32/constants.h*
+
+# We use MRPROPER_FILES and CLEAN_FILES now
+archclean:
+	$(Q)$(MAKE) $(clean)=$(boot)
+
+define archhelp
+  echo  '  Image         - kernel image (arch/$(ARCH)/boot/Image)'
+endef
diff --git a/arch/nds32/boot/Makefile b/arch/nds32/boot/Makefile
new file mode 100644
index 0000000..3f9b86f
--- /dev/null
+++ b/arch/nds32/boot/Makefile
@@ -0,0 +1,15 @@
+targets := Image Image.gz
+
+$(obj)/Image: vmlinux FORCE
+	$(call if_changed,objcopy)
+
+$(obj)/Image.gz: $(obj)/Image FORCE
+	$(call if_changed,gzip)
+
+install: $(obj)/Image
+	$(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \
+	$(obj)/Image System.map "$(INSTALL_PATH)"
+
+zinstall: $(obj)/Image.gz
+	$(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \
+	$(obj)/Image.gz System.map "$(INSTALL_PATH)"
diff --git a/arch/nds32/boot/dts/Makefile b/arch/nds32/boot/dts/Makefile
new file mode 100644
index 0000000..d31faa8
--- /dev/null
+++ b/arch/nds32/boot/dts/Makefile
@@ -0,0 +1,8 @@
+ifneq '$(CONFIG_NDS32_BUILTIN_DTB)' '""'
+BUILTIN_DTB := $(patsubst "%",%,$(CONFIG_NDS32_BUILTIN_DTB)).dtb.o
+else
+BUILTIN_DTB :=
+endif
+obj-$(CONFIG_OF) += $(BUILTIN_DTB)
+
+clean-files := *.dtb *.dtb.S
diff --git a/arch/nds32/boot/dts/ae3xx.dts b/arch/nds32/boot/dts/ae3xx.dts
new file mode 100644
index 0000000..bb39749
--- /dev/null
+++ b/arch/nds32/boot/dts/ae3xx.dts
@@ -0,0 +1,85 @@
+/dts-v1/;
+/ {
+	compatible = "andestech,ae3xx";
+	#address-cells = <1>;
+	#size-cells = <1>;
+	interrupt-parent = <&intc>;
+
+	chosen {
+		stdout-path = &serial0;
+	};
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x00000000 0x40000000>;
+	};
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		cpu@0 {
+			device_type = "cpu";
+			compatible = "andestech,n13", "andestech,nds32v3";
+			reg = <0>;
+			clock-frequency = <60000000>;
+			next-level-cache = <&L2>;
+		};
+	};
+
+	intc: interrupt-controller {
+		compatible = "andestech,ativic32";
+		#interrupt-cells = <1>;
+		interrupt-controller;
+	};
+
+	clock: clk {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <30000000>;
+	};
+
+	apb {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		serial0: serial@f0300000 {
+			compatible = "andestech,uart16550", "ns16550a";
+			reg = <0xf0300000 0x1000>;
+			interrupts = <8>;
+			clock-frequency = <14745600>;
+			reg-shift = <2>;
+			reg-offset = <32>;
+			no-loopback-test = <1>;
+		};
+
+		timer0: timer@f0400000 {
+			compatible = "andestech,atcpit100";
+			reg = <0xf0400000 0x1000>;
+			interrupts = <2>;
+			clocks = <&clock>;
+			clock-names = "PCLK";
+		};
+	};
+
+	ahb {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		L2: cache-controller@e0500000 {
+			compatible = "andestech,atl2c";
+			reg = <0xe0500000 0x1000>;
+			cache-unified;
+			cache-level = <2>;
+		};
+
+		mac0: ethernet@e0100000 {
+			compatible = "andestech,atmac100";
+			reg = <0xe0100000 0x1000>;
+			interrupts = <18>;
+		};
+	};
+};
diff --git a/arch/nds32/configs/defconfig b/arch/nds32/configs/defconfig
new file mode 100644
index 0000000..2546d87
--- /dev/null
+++ b/arch/nds32/configs/defconfig
@@ -0,0 +1,104 @@
+CONFIG_CROSS_COMPILE="nds32le-linux-"
+CONFIG_SYSVIPC=y
+CONFIG_POSIX_MQUEUE=y
+CONFIG_HIGH_RES_TIMERS=y
+CONFIG_BSD_PROCESS_ACCT=y
+CONFIG_BSD_PROCESS_ACCT_V3=y
+CONFIG_IKCONFIG=y
+CONFIG_IKCONFIG_PROC=y
+CONFIG_LOG_BUF_SHIFT=14
+CONFIG_USER_NS=y
+CONFIG_RELAY=y
+CONFIG_BLK_DEV_INITRD=y
+CONFIG_KALLSYMS_ALL=y
+CONFIG_PROFILING=y
+CONFIG_MODULES=y
+CONFIG_MODULE_UNLOAD=y
+# CONFIG_BLK_DEV_BSG is not set
+# CONFIG_CACHE_L2 is not set
+CONFIG_PREEMPT=y
+# CONFIG_COMPACTION is not set
+CONFIG_HZ_100=y
+# CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_UNIX=y
+CONFIG_NET_KEY=y
+CONFIG_INET=y
+CONFIG_IP_MULTICAST=y
+# CONFIG_INET_XFRM_MODE_TRANSPORT is not set
+# CONFIG_INET_XFRM_MODE_TUNNEL is not set
+# CONFIG_INET_XFRM_MODE_BEET is not set
+# CONFIG_INET_DIAG is not set
+# CONFIG_IPV6 is not set
+# CONFIG_BLK_DEV is not set
+CONFIG_NETDEVICES=y
+# CONFIG_NET_CADENCE is not set
+# CONFIG_NET_VENDOR_BROADCOM is not set
+CONFIG_FTMAC100=y
+# CONFIG_NET_VENDOR_INTEL is not set
+# CONFIG_NET_VENDOR_MARVELL is not set
+# CONFIG_NET_VENDOR_MICREL is not set
+# CONFIG_NET_VENDOR_NATSEMI is not set
+# CONFIG_NET_VENDOR_SEEQ is not set
+# CONFIG_NET_VENDOR_STMICRO is not set
+# CONFIG_NET_VENDOR_WIZNET is not set
+CONFIG_INPUT_EVDEV=y
+# CONFIG_INPUT_KEYBOARD is not set
+# CONFIG_INPUT_MOUSE is not set
+CONFIG_INPUT_TOUCHSCREEN=y
+# CONFIG_SERIO is not set
+CONFIG_VT_HW_CONSOLE_BINDING=y
+CONFIG_SERIAL_8250=y
+# CONFIG_SERIAL_8250_DEPRECATED_OPTIONS is not set
+CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_SERIAL_8250_NR_UARTS=3
+CONFIG_SERIAL_8250_RUNTIME_UARTS=3
+CONFIG_SERIAL_OF_PLATFORM=y
+# CONFIG_HW_RANDOM is not set
+# CONFIG_HWMON is not set
+# CONFIG_HID_A4TECH is not set
+# CONFIG_HID_APPLE is not set
+# CONFIG_HID_BELKIN is not set
+# CONFIG_HID_CHERRY is not set
+# CONFIG_HID_CHICONY is not set
+# CONFIG_HID_CYPRESS is not set
+# CONFIG_HID_EZKEY is not set
+# CONFIG_HID_ITE is not set
+# CONFIG_HID_KENSINGTON is not set
+# CONFIG_HID_LOGITECH is not set
+# CONFIG_HID_MICROSOFT is not set
+# CONFIG_HID_MONTEREY is not set
+# CONFIG_USB_SUPPORT is not set
+CONFIG_GENERIC_PHY=y
+CONFIG_EXT4_FS=y
+CONFIG_EXT4_FS_POSIX_ACL=y
+CONFIG_EXT4_FS_SECURITY=y
+CONFIG_EXT4_ENCRYPTION=y
+CONFIG_FUSE_FS=y
+CONFIG_MSDOS_FS=y
+CONFIG_VFAT_FS=y
+CONFIG_TMPFS=y
+CONFIG_TMPFS_POSIX_ACL=y
+CONFIG_CONFIGFS_FS=y
+CONFIG_NFS_FS=y
+CONFIG_NFS_V3_ACL=y
+CONFIG_NFS_V4=y
+CONFIG_NFS_V4_1=y
+CONFIG_NFS_USE_LEGACY_DNS=y
+CONFIG_NLS_CODEPAGE_437=y
+CONFIG_NLS_ISO8859_1=y
+CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_DWARF4=y
+CONFIG_GDB_SCRIPTS=y
+CONFIG_READABLE_ASM=y
+CONFIG_HEADERS_CHECK=y
+CONFIG_DEBUG_SECTION_MISMATCH=y
+CONFIG_MAGIC_SYSRQ=y
+CONFIG_DEBUG_KERNEL=y
+CONFIG_PANIC_ON_OOPS=y
+# CONFIG_SCHED_DEBUG is not set
+# CONFIG_DEBUG_PREEMPT is not set
+CONFIG_STACKTRACE=y
+CONFIG_RCU_CPU_STALL_TIMEOUT=300
+# CONFIG_CRYPTO_HW is not set
diff --git a/arch/nds32/include/asm/Kbuild b/arch/nds32/include/asm/Kbuild
new file mode 100644
index 0000000..06bdf81
--- /dev/null
+++ b/arch/nds32/include/asm/Kbuild
@@ -0,0 +1,55 @@
+generic-y += asm-offsets.h
+generic-y += atomic.h
+generic-y += bitops.h
+generic-y += bitsperlong.h
+generic-y += bpf_perf_event.h
+generic-y += bug.h
+generic-y += bugs.h
+generic-y += checksum.h
+generic-y += clkdev.h
+generic-y += cmpxchg.h
+generic-y += cmpxchg-local.h
+generic-y += cputime.h
+generic-y += device.h
+generic-y += div64.h
+generic-y += dma.h
+generic-y += emergency-restart.h
+generic-y += errno.h
+generic-y += exec.h
+generic-y += fb.h
+generic-y += fcntl.h
+generic-y += ftrace.h
+generic-y += gpio.h
+generic-y += hardirq.h
+generic-y += hw_irq.h
+generic-y += ioctl.h
+generic-y += ioctls.h
+generic-y += irq.h
+generic-y += irq_regs.h
+generic-y += irq_work.h
+generic-y += kdebug.h
+generic-y += kmap_types.h
+generic-y += kprobes.h
+generic-y += kvm_para.h
+generic-y += limits.h
+generic-y += local.h
+generic-y += mm-arch-hooks.h
+generic-y += mman.h
+generic-y += parport.h
+generic-y += pci.h
+generic-y += percpu.h
+generic-y += preempt.h
+generic-y += sections.h
+generic-y += segment.h
+generic-y += serial.h
+generic-y += shmbuf.h
+generic-y += sizes.h
+generic-y += stat.h
+generic-y += switch_to.h
+generic-y += timex.h
+generic-y += topology.h
+generic-y += trace_clock.h
+generic-y += unaligned.h
+generic-y += user.h
+generic-y += vga.h
+generic-y += word-at-a-time.h
diff --git a/arch/nds32/include/asm/assembler.h b/arch/nds32/include/asm/assembler.h
new file mode 100644
index 0000000..c385578
--- /dev/null
+++ b/arch/nds32/include/asm/assembler.h
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __NDS32_ASSEMBLER_H__
+#define __NDS32_ASSEMBLER_H__
+
+.macro gie_disable
+	setgie.d
+	dsb
+.endm
+
+.macro gie_enable
+	setgie.e
+	dsb
+.endm
+
+.macro gie_save oldpsw
+	mfsr \oldpsw, $ir0
+	setgie.d
+        dsb
+.endm
+
+.macro gie_restore oldpsw
+	andi \oldpsw, \oldpsw, #0x1
+	beqz \oldpsw, 7001f
+	setgie.e
+	dsb
+7001:
+.endm
+
+
+#define USER(insn,  reg, addr, opr)	\
+9999:	insn  reg, addr, opr;		\
+	.section __ex_table,"a";	\
+	.align 3;			\
+	.long	9999b, 9001f;		\
+	.previous
+
+#endif /* __NDS32_ASSEMBLER_H__ */
diff --git a/arch/nds32/include/asm/barrier.h b/arch/nds32/include/asm/barrier.h
new file mode 100644
index 0000000..faafc37
--- /dev/null
+++ b/arch/nds32/include/asm/barrier.h
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __NDS32_ASM_BARRIER_H
+#define __NDS32_ASM_BARRIER_H
+
+#ifndef __ASSEMBLY__
+#define mb()		asm volatile("msync all":::"memory")
+#define rmb()		asm volatile("msync all":::"memory")
+#define wmb()		asm volatile("msync store":::"memory")
+#include <asm-generic/barrier.h>
+
+#endif	/* __ASSEMBLY__ */
+
+#endif	/* __NDS32_ASM_BARRIER_H */
diff --git a/arch/nds32/include/asm/bitfield.h b/arch/nds32/include/asm/bitfield.h
new file mode 100644
index 0000000..c73f71d
--- /dev/null
+++ b/arch/nds32/include/asm/bitfield.h
@@ -0,0 +1,963 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __NDS32_BITFIELD_H__
+#define __NDS32_BITFIELD_H__
+/******************************************************************************
+ * cr0: CPU_VER (CPU Version Register)
+ *****************************************************************************/
+#define CPU_VER_offCFGID	0	/* Minor configuration */
+#define CPU_VER_offREV		16	/* Revision of the CPU version */
+#define CPU_VER_offCPUID	24	/* Major CPU versions */
+
+#define CPU_VER_mskCFGID	( 0xFFFF  << CPU_VER_offCFGID )
+#define CPU_VER_mskREV		( 0xFF  << CPU_VER_offREV )
+#define CPU_VER_mskCPUID	( 0xFF  << CPU_VER_offCPUID )
+
+/******************************************************************************
+ * cr1: ICM_CFG (Instruction Cache/Memory Configuration Register)
+ *****************************************************************************/
+#define ICM_CFG_offISET		0	/* I-cache sets (# of cache lines) per way */
+#define ICM_CFG_offIWAY		3	/* I-cache ways */
+#define ICM_CFG_offISZ		6	/* I-cache line size */
+#define ICM_CFG_offILCK		9	/* I-cache locking support */
+#define ICM_CFG_offILMB		10	/* On-chip ILM banks */
+#define ICM_CFG_offBSAV		13	/* ILM base register alignment version */
+/* bit 15:31 reserved */
+
+#define ICM_CFG_mskISET		( 0x7  << ICM_CFG_offISET )
+#define ICM_CFG_mskIWAY		( 0x7  << ICM_CFG_offIWAY )
+#define ICM_CFG_mskISZ		( 0x7  << ICM_CFG_offISZ )
+#define ICM_CFG_mskILCK		( 0x1  << ICM_CFG_offILCK )
+#define ICM_CFG_mskILMB		( 0x7  << ICM_CFG_offILMB )
+#define ICM_CFG_mskBSAV		( 0x3  << ICM_CFG_offBSAV )
+
+/******************************************************************************
+ * cr2: DCM_CFG (Data Cache/Memory Configuration Register)
+ *****************************************************************************/
+#define DCM_CFG_offDSET		0	/* D-cache sets (# of cache lines) per way */
+#define DCM_CFG_offDWAY		3	/* D-cache ways */
+#define DCM_CFG_offDSZ		6	/* D-cache line size */
+#define DCM_CFG_offDLCK		9	/* D-cache locking support */
+#define DCM_CFG_offDLMB		10	/* On-chip DLM banks */
+#define DCM_CFG_offBSAV		13	/* DLM base register alignment version */
+/* bit 15:31 reserved */
+
+#define DCM_CFG_mskDSET		( 0x7  << DCM_CFG_offDSET )
+#define DCM_CFG_mskDWAY		( 0x7  << DCM_CFG_offDWAY )
+#define DCM_CFG_mskDSZ		( 0x7  << DCM_CFG_offDSZ )
+#define DCM_CFG_mskDLCK		( 0x1  << DCM_CFG_offDLCK )
+#define DCM_CFG_mskDLMB		( 0x7  << DCM_CFG_offDLMB )
+#define DCM_CFG_mskBSAV		( 0x3  << DCM_CFG_offBSAV )
+
+/******************************************************************************
+ * cr3: MMU_CFG (MMU Configuration Register)
+ *****************************************************************************/
+#define MMU_CFG_offMMPS		0	/* Memory management protection scheme */
+#define MMU_CFG_offMMPV		2	/* Memory management protection version number */
+#define MMU_CFG_offFATB		7	/* Fully-associative or non-fully-associative TLB */
+
+#define MMU_CFG_offTBW		8	/* TLB ways(non-associative) TBS */
+#define MMU_CFG_offTBS		11	/* TLB sets per way(non-associative) TBS */
+/* bit 14:14 reserved */
+
+#define MMU_CFG_offEP8MIN4	15	/* 8KB page supported while minimum page is 4KB */
+#define MMU_CFG_offfEPSZ	16	/* Extra page size supported */
+#define MMU_CFG_offTLBLCK	24	/* TLB locking support */
+#define MMU_CFG_offHPTWK	25	/* Hardware Page Table Walker implemented */
+#define MMU_CFG_offDE		26	/* Default endian */
+#define MMU_CFG_offNTPT		27	/* Partitions for non-translated attributes */
+#define MMU_CFG_offIVTB		28	/* Invisible TLB */
+#define MMU_CFG_offVLPT		29	/* VLPT for fast TLB fill handling implemented */
+#define MMU_CFG_offNTME		30	/* Non-translated VA to PA mapping */
+/* bit 31 reserved */
+
+#define MMU_CFG_mskMMPS		( 0x3  << MMU_CFG_offMMPS )
+#define MMU_CFG_mskMMPV		( 0x1F  << MMU_CFG_offMMPV )
+#define MMU_CFG_mskFATB		( 0x1  << MMU_CFG_offFATB )
+#define MMU_CFG_mskTBW		( 0x7  << MMU_CFG_offTBW )
+#define MMU_CFG_mskTBS		( 0x7  << MMU_CFG_offTBS )
+#define MMU_CFG_mskEP8MIN4	( 0x1  << MMU_CFG_offEP8MIN4 )
+#define MMU_CFG_mskfEPSZ	( 0xFF  << MMU_CFG_offfEPSZ )
+#define MMU_CFG_mskTLBLCK	( 0x1  << MMU_CFG_offTLBLCK )
+#define MMU_CFG_mskHPTWK	( 0x1  << MMU_CFG_offHPTWK )
+#define MMU_CFG_mskDE		( 0x1  << MMU_CFG_offDE )
+#define MMU_CFG_mskNTPT		( 0x1  << MMU_CFG_offNTPT )
+#define MMU_CFG_mskIVTB		( 0x1  << MMU_CFG_offIVTB )
+#define MMU_CFG_mskVLPT		( 0x1  << MMU_CFG_offVLPT )
+#define MMU_CFG_mskNTME		( 0x1  << MMU_CFG_offNTME )
+
+/******************************************************************************
+ * cr4: MSC_CFG (Misc Configuration Register)
+ *****************************************************************************/
+#define MSC_CFG_offEDM		0
+#define MSC_CFG_offLMDMA	1
+#define MSC_CFG_offPFM		2
+#define MSC_CFG_offHSMP		3
+#define MSC_CFG_offTRACE	4
+#define MSC_CFG_offDIV		5
+#define MSC_CFG_offMAC		6
+#define MSC_CFG_offAUDIO	7
+#define MSC_CFG_offL2C		9
+#define MSC_CFG_offRDREG	10
+#define MSC_CFG_offADR24	11
+#define MSC_CFG_offINTLC	12
+#define MSC_CFG_offBASEV	13
+#define MSC_CFG_offNOD		16
+/* bit 13:31 reserved */
+
+#define MSC_CFG_mskEDM		( 0x1  << MSC_CFG_offEDM )
+#define MSC_CFG_mskLMDMA	( 0x1  << MSC_CFG_offLMDMA )
+#define MSC_CFG_mskPFM		( 0x1  << MSC_CFG_offPFM )
+#define MSC_CFG_mskHSMP		( 0x1  << MSC_CFG_offHSMP )
+#define MSC_CFG_mskTRACE	( 0x1  << MSC_CFG_offTRACE )
+#define MSC_CFG_mskDIV		( 0x1  << MSC_CFG_offDIV )
+#define MSC_CFG_mskMAC		( 0x1  << MSC_CFG_offMAC )
+#define MSC_CFG_mskAUDIO	( 0x3  << MSC_CFG_offAUDIO )
+#define MSC_CFG_mskL2C		( 0x1  << MSC_CFG_offL2C )
+#define MSC_CFG_mskRDREG	( 0x1  << MSC_CFG_offRDREG )
+#define MSC_CFG_mskADR24	( 0x1  << MSC_CFG_offADR24 )
+#define MSC_CFG_mskINTLC	( 0x1  << MSC_CFG_offINTLC )
+#define MSC_CFG_mskBASEV	( 0x7  << MSC_CFG_offBASEV )
+#define MSC_CFG_mskNOD		( 0x1  << MSC_CFG_offNOD )
+
+/******************************************************************************
+ * cr5: CORE_CFG (Core Identification Register)
+ *****************************************************************************/
+#define CORE_ID_offCOREID	0
+/* bit 4:31 reserved */
+
+#define CORE_ID_mskCOREID	( 0xF  << CORE_ID_offCOREID )
+
+/******************************************************************************
+ * cr6: FUCOP_EXIST (FPU and Coprocessor Existence Configuration Register)
+ *****************************************************************************/
+#define FUCOP_EXIST_offCP0EX	0
+#define FUCOP_EXIST_offCP1EX	1
+#define FUCOP_EXIST_offCP2EX	2
+#define FUCOP_EXIST_offCP3EX	3
+#define FUCOP_EXIST_offCP0ISFPU	31
+
+#define FUCOP_EXIST_mskCP0EX	( 0x1  << FUCOP_EXIST_offCP0EX )
+#define FUCOP_EXIST_mskCP1EX	( 0x1  << FUCOP_EXIST_offCP1EX )
+#define FUCOP_EXIST_mskCP2EX	( 0x1  << FUCOP_EXIST_offCP2EX )
+#define FUCOP_EXIST_mskCP3EX	( 0x1  << FUCOP_EXIST_offCP3EX )
+#define FUCOP_EXIST_mskCP0ISFPU	( 0x1  << FUCOP_EXIST_offCP0ISFPU )
+
+/******************************************************************************
+ * ir0: PSW (Processor Status Word Register)
+ * ir1: IPSW (Interruption PSW Register)
+ * ir2: P_IPSW (Previous IPSW Register)
+ *****************************************************************************/
+#define PSW_offGIE		0	/* Global Interrupt Enable */
+#define PSW_offINTL		1	/* Interruption Stack Level */
+#define PSW_offPOM		3	/* Processor Operation Mode, User/Superuser */
+#define PSW_offBE		5	/* Endianness for data memory access, 1:MSB, 0:LSB */
+#define PSW_offIT		6	/* Enable instruction address translation */
+#define PSW_offDT		7	/* Enable data address translation */
+#define PSW_offIME		8	/* Instruction Machine Error flag */
+#define PSW_offDME		9	/* Data Machine Error flag */
+#define PSW_offDEX		10	/* Debug Exception */
+#define PSW_offHSS		11	/* Hardware Single Stepping */
+#define PSW_offDRBE		12	/* Device Register Endian Mode */
+#define PSW_offAEN		13	/* Audio ISA special feature */
+#define PSW_offWBNA		14	/* Write Back Non-Allocate */
+#define PSW_offIFCON		15	/* IFC On */
+#define PSW_offCPL		16	/* Current Priority Level */
+/* bit 19:31 reserved */
+
+#define PSW_mskGIE		( 0x1  << PSW_offGIE )
+#define PSW_mskINTL		( 0x3  << PSW_offINTL )
+#define PSW_mskPOM		( 0x3  << PSW_offPOM )
+#define PSW_mskBE		( 0x1  << PSW_offBE )
+#define PSW_mskIT		( 0x1  << PSW_offIT )
+#define PSW_mskDT		( 0x1  << PSW_offDT )
+#define PSW_mskIME		( 0x1  << PSW_offIME )
+#define PSW_mskDME		( 0x1  << PSW_offDME )
+#define PSW_mskDEX		( 0x1  << PSW_offDEX )
+#define PSW_mskHSS		( 0x1  << PSW_offHSS )
+#define PSW_mskDRBE		( 0x1  << PSW_offDRBE )
+#define PSW_mskAEN		( 0x1  << PSW_offAEN )
+#define PSW_mskWBNA		( 0x1  << PSW_offWBNA )
+#define PSW_mskIFCON		( 0x1  << PSW_offIFCON )
+#define PSW_mskCPL		( 0x7  << PSW_offCPL )
+
+#define PSW_SYSTEM		( 1 << PSW_offPOM )
+#define PSW_INTL_1		( 1 << PSW_offINTL )
+#define PSW_CPL_NO		( 0 << PSW_offCPL )
+#define PSW_CPL_ANY		( 7 << PSW_offCPL )
+
+#define PSW_clr			(PSW_mskGIE|PSW_mskINTL|PSW_mskPOM|PSW_mskIT|PSW_mskDT|PSW_mskIME|PSW_mskWBNA)
+#ifdef __NDS32_EB__
+#ifdef CONFIG_WBNA
+#define PSW_init		(PSW_mskWBNA|(1<<PSW_offINTL)|(1<<PSW_offPOM)|PSW_mskIT|PSW_mskDT|PSW_mskBE)
+#else
+#define PSW_init		((1<<PSW_offINTL)|(1<<PSW_offPOM)|PSW_mskIT|PSW_mskDT|PSW_mskBE)
+#endif
+#else
+#ifdef CONFIG_WBNA
+#define PSW_init		(PSW_mskWBNA|(1<<PSW_offINTL)|(1<<PSW_offPOM)|PSW_mskIT|PSW_mskDT)
+#else
+#define PSW_init		((1<<PSW_offINTL)|(1<<PSW_offPOM)|PSW_mskIT|PSW_mskDT)
+#endif
+#endif
+/******************************************************************************
+ * ir3: IVB (Interruption Vector Base Register)
+ *****************************************************************************/
+/* bit 0:12 reserved */
+#define IVB_offNIVIC		1	/* Number of input for IVIC Controller */
+#define IVB_offIVIC_VER		11	/* IVIC Version */
+#define IVB_offEVIC		13	/* External Vector Interrupt Controller mode */
+#define IVB_offESZ		14	/* Size of each vector entry */
+#define IVB_offIVBASE		16	/* BasePA of interrupt vector table */
+
+#define IVB_mskNIVIC		( 0x7  << IVB_offNIVIC )
+#define IVB_mskIVIC_VER		( 0x3  << IVB_offIVIC_VER )
+#define IVB_mskEVIC		( 0x1  << IVB_offEVIC )
+#define IVB_mskESZ		( 0x3  << IVB_offESZ )
+#define IVB_mskIVBASE		( 0xFFFF  << IVB_offIVBASE )
+
+#define IVB_valESZ4		0
+#define IVB_valESZ16		1
+#define IVB_valESZ64		2
+#define IVB_valESZ256		3
+/******************************************************************************
+ * ir4: EVA (Exception Virtual Address Register)
+ * ir5: P_EVA (Previous EVA Register)
+ *****************************************************************************/
+
+	/* This register contains the VA that causes the exception */
+
+/******************************************************************************
+ * ir6: ITYPE (Interruption Type Register)
+ * ir7: P_ITYPE (Previous ITYPE Register)
+ *****************************************************************************/
+#define ITYPE_offETYPE		0	/* Exception Type */
+#define ITYPE_offINST		4	/* Exception caused by insn fetch or data access */
+/* bit 5:15 reserved */
+#define ITYPE_offVECTOR		5	/* Vector */
+#define ITYPE_offSWID		16	/* SWID of debugging exception */
+/* bit 31:31 reserved */
+
+#define ITYPE_mskETYPE		( 0xF  << ITYPE_offETYPE )
+#define ITYPE_mskINST		( 0x1  << ITYPE_offINST )
+#define ITYPE_mskVECTOR		( 0x7F  << ITYPE_offVECTOR )
+#define ITYPE_mskSWID		( 0x7FFF  << ITYPE_offSWID )
+
+/* Additional definitions for ITYPE register */
+#define ITYPE_offSTYPE          16	/* Arithmetic Sub Type */
+#define ITYPE_offCPID           20	/* Co-Processor ID which generate the exception */
+
+#define ITYPE_mskSTYPE		( 0xF  << ITYPE_offSTYPE )
+#define ITYPE_mskCPID		( 0x3  << ITYPE_offCPID )
+
+#define NDS32_VECTOR_mskNONEXCEPTION	0x78
+#define NDS32_VECTOR_offEXCEPTION	8
+#define NDS32_VECTOR_offINTERRUPT	9
+
+/* Interrupt vector entry */
+#define ENTRY_RESET_NMI			0
+#define ENTRY_TLB_FILL			1
+#define ENTRY_PTE_NOT_PRESENT		2
+#define ENTRY_TLB_MISC			3
+#define ENTRY_TLB_VLPT_MISS		4
+#define ENTRY_MACHINE_ERROR		5
+#define ENTRY_DEBUG_RELATED		6
+#define ENTRY_GENERAL_EXCPETION		7
+#define ENTRY_SYSCALL			8
+
+/* PTE not present exception definition */
+#define ETYPE_NON_LEAF_PTE_NOT_PRESENT	0
+#define ETYPE_LEAF_PTE_NOT_PRESENT	1
+
+/* General exception ETYPE definition */
+#define ETYPE_ALIGNMENT_CHECK		0
+#define ETYPE_RESERVED_INSTRUCTION	1
+#define ETYPE_TRAP			2
+#define ETYPE_ARITHMETIC		3
+#define ETYPE_PRECISE_BUS_ERROR		4
+#define ETYPE_IMPRECISE_BUS_ERROR	5
+#define ETYPE_COPROCESSOR		6
+#define ETYPE_RESERVED_VALUE		7
+#define ETYPE_NONEXISTENT_MEM_ADDRESS	8
+#define ETYPE_MPZIU_CONTROL		9
+#define ETYPE_NEXT_PRECISE_STACK_OFL	10
+
+/* Kerenl reserves software ID */
+#define SWID_RAISE_INTERRUPT_LEVEL	0x1a	/* SWID_RAISE_INTERRUPT_LEVEL is used to
+						 * raise interrupt level for debug exception
+						 */
+
+/******************************************************************************
+ * ir8: MERR (Machine Error Log Register)
+ *****************************************************************************/
+/* bit 0:30 reserved */
+#define MERR_offBUSERR		31	/* Bus error caused by a load insn */
+
+#define MERR_mskBUSERR		( 0x1  << MERR_offBUSERR )
+
+/******************************************************************************
+ * ir9: IPC (Interruption Program Counter Register)
+ * ir10: P_IPC (Previous IPC Register)
+ * ir11: OIPC (Overflow Interruption Program Counter Register)
+ *****************************************************************************/
+
+	/* This is the shadow stack register of the Program Counter */
+
+/******************************************************************************
+ * ir12: P_P0 (Previous P0 Register)
+ * ir13: P_P1 (Previous P1 Register)
+ *****************************************************************************/
+
+	/* These are shadow registers of $p0 and $p1 */
+
+/******************************************************************************
+ * ir14: INT_MASK (Interruption Masking Register)
+ *****************************************************************************/
+#define INT_MASK_offH0IM	0	/* Hardware Interrupt 0 Mask bit */
+#define INT_MASK_offH1IM	1	/* Hardware Interrupt 1 Mask bit */
+#define INT_MASK_offH2IM	2	/* Hardware Interrupt 2 Mask bit */
+#define INT_MASK_offH3IM	3	/* Hardware Interrupt 3 Mask bit */
+#define INT_MASK_offH4IM	4	/* Hardware Interrupt 4 Mask bit */
+#define INT_MASK_offH5IM	5	/* Hardware Interrupt 5 Mask bit */
+/* bit 6:15 reserved */
+#define INT_MASK_offSIM		16	/* Software Interrupt Mask bit */
+/* bit 17:29 reserved */
+#define INT_MASK_offIDIVZE	30	/* Enable detection for Divide-By-Zero */
+#define INT_MASK_offDSSIM	31	/* Default Single Stepping Interruption Mask */
+
+#define INT_MASK_mskH0IM	( 0x1  << INT_MASK_offH0IM )
+#define INT_MASK_mskH1IM	( 0x1  << INT_MASK_offH1IM )
+#define INT_MASK_mskH2IM	( 0x1  << INT_MASK_offH2IM )
+#define INT_MASK_mskH3IM	( 0x1  << INT_MASK_offH3IM )
+#define INT_MASK_mskH4IM	( 0x1  << INT_MASK_offH4IM )
+#define INT_MASK_mskH5IM	( 0x1  << INT_MASK_offH5IM )
+#define INT_MASK_mskSIM		( 0x1  << INT_MASK_offSIM )
+#define INT_MASK_mskIDIVZE	( 0x1  << INT_MASK_offIDIVZE )
+#define INT_MASK_mskDSSIM	( 0x1  << INT_MASK_offDSSIM )
+
+#define INT_MASK_INITAIAL_VAL	0x10003
+
+/******************************************************************************
+ * ir15: INT_PEND (Interrupt Pending Register)
+ *****************************************************************************/
+#define INT_PEND_offH0I		0	/* Hardware Interrupt 0 pending bit */
+#define INT_PEND_offH1I		1	/* Hardware Interrupt 1 pending bit */
+#define INT_PEND_offH2I		2	/* Hardware Interrupt 2 pending bit */
+#define INT_PEND_offH3I		3	/* Hardware Interrupt 3 pending bit */
+#define INT_PEND_offH4I		4	/* Hardware Interrupt 4 pending bit */
+#define INT_PEND_offH5I		5	/* Hardware Interrupt 5 pending bit */
+
+#define INT_PEND_offCIPL	0	/* Current Interrupt Priority Level */
+
+/* bit 6:15 reserved */
+#define INT_PEND_offSWI		16	/* Software Interrupt pending bit */
+/* bit 17:31 reserved */
+
+#define INT_PEND_mskH0I		( 0x1  << INT_PEND_offH0I )
+#define INT_PEND_mskH1I		( 0x1  << INT_PEND_offH1I )
+#define INT_PEND_mskH2I		( 0x1  << INT_PEND_offH2I )
+#define INT_PEND_mskH3I		( 0x1  << INT_PEND_offH3I )
+#define INT_PEND_mskH4I		( 0x1  << INT_PEND_offH4I )
+#define INT_PEND_mskH5I		( 0x1  << INT_PEND_offH5I )
+#define INT_PEND_mskCIPL	( 0x1  << INT_PEND_offCIPL )
+#define INT_PEND_mskSWI		( 0x1  << INT_PEND_offSWI )
+
+/******************************************************************************
+ * mr0: MMU_CTL (MMU Control Register)
+ *****************************************************************************/
+#define MMU_CTL_offD		0	/* Default minimum page size */
+#define MMU_CTL_offNTC0		1	/* Non-Translated Cachebility of partition 0 */
+#define MMU_CTL_offNTC1		3	/* Non-Translated Cachebility of partition 1 */
+#define MMU_CTL_offNTC2		5	/* Non-Translated Cachebility of partition 2 */
+#define MMU_CTL_offNTC3		7	/* Non-Translated Cachebility of partition 3 */
+#define MMU_CTL_offTBALCK	9	/* TLB all-lock resolution scheme */
+#define MMU_CTL_offMPZIU	10	/* Multiple Page Size In Use bit */
+#define MMU_CTL_offNTM0		11	/* Non-Translated VA to PA of partition 0 */
+#define MMU_CTL_offNTM1		13	/* Non-Translated VA to PA of partition 1 */
+#define MMU_CTL_offNTM2		15	/* Non-Translated VA to PA of partition 2 */
+#define MMU_CTL_offNTM3		17	/* Non-Translated VA to PA of partition 3 */
+#define MMU_CTL_offUNA		23	/* Unaligned access */
+/* bit 24:31 reserved */
+
+#define MMU_CTL_mskD		( 0x1  << MMU_CTL_offD )
+#define MMU_CTL_mskNTC0		( 0x3  << MMU_CTL_offNTC0 )
+#define MMU_CTL_mskNTC1		( 0x3  << MMU_CTL_offNTC1 )
+#define MMU_CTL_mskNTC2		( 0x3  << MMU_CTL_offNTC2 )
+#define MMU_CTL_mskNTC3		( 0x3  << MMU_CTL_offNTC3 )
+#define MMU_CTL_mskTBALCK	( 0x1  << MMU_CTL_offTBALCK )
+#define MMU_CTL_mskMPZIU	( 0x1  << MMU_CTL_offMPZIU )
+#define MMU_CTL_mskNTM0		( 0x3  << MMU_CTL_offNTM0 )
+#define MMU_CTL_mskNTM1         ( 0x3  << MMU_CTL_offNTM1 )
+#define MMU_CTL_mskNTM2         ( 0x3  << MMU_CTL_offNTM2 )
+#define MMU_CTL_mskNTM3         ( 0x3  << MMU_CTL_offNTM3 )
+
+#define MMU_CTL_D4KB		0
+#define MMU_CTL_D8KB		1
+#define MMU_CTL_UNA		( 0x1  << MMU_CTL_offUNA )
+
+#define MMU_CTL_CACHEABLE_WB	2
+#define MMU_CTL_CACHEABLE_WT	3
+
+/******************************************************************************
+ * mr1: L1_PPTB (L1 Physical Page Table Base Register)
+ *****************************************************************************/
+#define L1_PPTB_offNV		0	/* Enable Hardware Page Table Walker (HPTWK) */
+/* bit 1:11 reserved */
+#define L1_PPTB_offBASE		12	/* First level physical page table base address */
+
+#define L1_PPTB_mskNV		( 0x1  << L1_PPTB_offNV )
+#define L1_PPTB_mskBASE		( 0xFFFFF  << L1_PPTB_offBASE )
+
+/******************************************************************************
+ * mr2: TLB_VPN (TLB Access VPN Register)
+ *****************************************************************************/
+/* bit 0:11 reserved */
+#define TLB_VPN_offVPN		12	/* Virtual Page Number */
+
+#define TLB_VPN_mskVPN		( 0xFFFFF  << TLB_VPN_offVPN )
+
+/******************************************************************************
+ * mr3: TLB_DATA (TLB Access Data Register)
+ *****************************************************************************/
+#define TLB_DATA_offV		0	/* PTE is valid and present */
+#define TLB_DATA_offM		1	/* Page read/write access privilege */
+#define TLB_DATA_offD		4	/* Dirty bit */
+#define TLB_DATA_offX		5	/* Executable bit */
+#define TLB_DATA_offA		6	/* Access bit */
+#define TLB_DATA_offG		7	/* Global page (shared across contexts) */
+#define TLB_DATA_offC		8	/* Cacheability atribute */
+/* bit 11:11 reserved */
+#define TLB_DATA_offPPN		12	/* Phisical Page Number */
+
+#define TLB_DATA_mskV		( 0x1  << TLB_DATA_offV )
+#define TLB_DATA_mskM		( 0x7  << TLB_DATA_offM )
+#define TLB_DATA_mskD		( 0x1  << TLB_DATA_offD )
+#define TLB_DATA_mskX		( 0x1  << TLB_DATA_offX )
+#define TLB_DATA_mskA		( 0x1  << TLB_DATA_offA )
+#define TLB_DATA_mskG		( 0x1  << TLB_DATA_offG )
+#define TLB_DATA_mskC		( 0x7  << TLB_DATA_offC )
+#define TLB_DATA_mskPPN		( 0xFFFFF  << TLB_DATA_offPPN )
+
+#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
+#define TLB_DATA_kernel_text_attr	(TLB_DATA_mskV|TLB_DATA_mskM|TLB_DATA_mskD|TLB_DATA_mskX|TLB_DATA_mskG|TLB_DATA_mskC)
+#else
+#define TLB_DATA_kernel_text_attr	(TLB_DATA_mskV|TLB_DATA_mskM|TLB_DATA_mskD|TLB_DATA_mskX|TLB_DATA_mskG|(0x6 << TLB_DATA_offC))
+#endif
+
+/******************************************************************************
+ * mr4: TLB_MISC (TLB Access Misc Register)
+ *****************************************************************************/
+#define TLB_MISC_offACC_PSZ	0	/* Page size of a PTE entry */
+#define TLB_MISC_offCID		4	/* Context id */
+/* bit 13:31 reserved */
+
+#define TLB_MISC_mskACC_PSZ    ( 0xF  << TLB_MISC_offACC_PSZ )
+#define TLB_MISC_mskCID        ( 0x1FF  << TLB_MISC_offCID )
+
+/******************************************************************************
+ * mr5: VLPT_IDX (Virtual Linear Page Table Index Register)
+ *****************************************************************************/
+#define VLPT_IDX_offZERO	0	/* Always 0 */
+#define VLPT_IDX_offEVPN	2	/* Exception Virtual Page Number */
+#define VLPT_IDX_offVLPTB	22	/* Base VA of VLPT */
+
+#define VLPT_IDX_mskZERO	( 0x3  << VLPT_IDX_offZERO )
+#define VLPT_IDX_mskEVPN	( 0xFFFFF  << VLPT_IDX_offEVPN )
+#define VLPT_IDX_mskVLPTB	( 0x3FF  << VLPT_IDX_offVLPTB )
+
+/******************************************************************************
+ * mr6: ILMB (Instruction Local Memory Base Register)
+ *****************************************************************************/
+#define ILMB_offIEN		0	/* Enable ILM */
+#define ILMB_offILMSZ		1	/* Size of ILM */
+/* bit 5:19 reserved */
+#define ILMB_offIBPA		20	/* Base PA of ILM */
+
+#define ILMB_mskIEN		( 0x1  << ILMB_offIEN )
+#define ILMB_mskILMSZ		( 0xF  << ILMB_offILMSZ )
+#define ILMB_mskIBPA		( 0xFFF  << ILMB_offIBPA )
+
+/******************************************************************************
+ * mr7: DLMB (Data Local Memory Base Register)
+ *****************************************************************************/
+#define DLMB_offDEN		0	/* Enable DLM */
+#define DLMB_offDLMSZ		1	/* Size of DLM */
+#define DLMB_offDBM		5	/* Enable Double-Buffer Mode for DLM */
+#define DLMB_offDBB		6	/* Double-buffer bank which can be accessed by the processor */
+/* bit 7:19 reserved */
+#define DLMB_offDBPA		20	/* Base PA of DLM */
+
+#define DLMB_mskDEN		( 0x1  << DLMB_offDEN )
+#define DLMB_mskDLMSZ		( 0xF  << DLMB_offDLMSZ )
+#define DLMB_mskDBM		( 0x1  << DLMB_offDBM )
+#define DLMB_mskDBB		( 0x1  << DLMB_offDBB )
+#define DLMB_mskDBPA		( 0xFFF  << DLMB_offDBPA )
+
+/******************************************************************************
+ * mr8: CACHE_CTL (Cache Control Register)
+ *****************************************************************************/
+#define CACHE_CTL_offIC_EN	0	/* Enable I-cache */
+#define CACHE_CTL_offDC_EN	1	/* Enable D-cache */
+#define CACHE_CTL_offICALCK	2	/* I-cache all-lock resolution scheme */
+#define CACHE_CTL_offDCALCK	3	/* D-cache all-lock resolution scheme */
+#define CACHE_CTL_offDCCWF	4	/* Enable D-cache Critical Word Forwarding */
+#define CACHE_CTL_offDCPMW	5	/* Enable D-cache concurrent miss and write-back processing */
+/* bit 6:31 reserved */
+
+#define CACHE_CTL_mskIC_EN	( 0x1  << CACHE_CTL_offIC_EN )
+#define CACHE_CTL_mskDC_EN	( 0x1  << CACHE_CTL_offDC_EN )
+#define CACHE_CTL_mskICALCK	( 0x1  << CACHE_CTL_offICALCK )
+#define CACHE_CTL_mskDCALCK	( 0x1  << CACHE_CTL_offDCALCK )
+#define CACHE_CTL_mskDCCWF	( 0x1  << CACHE_CTL_offDCCWF )
+#define CACHE_CTL_mskDCPMW	( 0x1  << CACHE_CTL_offDCPMW )
+
+/******************************************************************************
+ * mr9: HSMP_SADDR (High Speed Memory Port Starting Address)
+ *****************************************************************************/
+#define HSMP_SADDR_offEN	0	/* Enable control bit for the High Speed Memory port */
+/* bit 1:19 reserved */
+
+#define HSMP_SADDR_offRANGE	1	/* Denote the address range (only defined in HSMP v2 ) */
+#define HSMP_SADDR_offSADDR	20	/* Starting base PA of the High Speed Memory Port region */
+
+#define HSMP_SADDR_mskEN	( 0x1  << HSMP_SADDR_offEN )
+#define HSMP_SADDR_mskRANGE	( 0xFFF  << HSMP_SADDR_offRANGE )
+#define HSMP_SADDR_mskSADDR	( 0xFFF  << HSMP_SADDR_offSADDR )
+
+/******************************************************************************
+ * mr10: HSMP_EADDR (High Speed Memory Port Ending Address)
+ *****************************************************************************/
+/* bit 0:19 reserved */
+#define HSMP_EADDR_offEADDR	20
+
+#define HSMP_EADDR_mskEADDR	( 0xFFF  << HSMP_EADDR_offEADDR )
+
+/******************************************************************************
+ * dr0+(n*5): BPCn (n=0-7) (Breakpoint Control Register)
+ *****************************************************************************/
+#define BPC_offWP		0	/* Configuration of BPAn */
+#define BPC_offEL		1	/* Enable BPAn */
+#define BPC_offS		2	/* Data address comparison for a store instruction */
+#define BPC_offP		3	/* Compared data address is PA */
+#define BPC_offC		4	/* CID value is compared with the BPCIDn register */
+#define BPC_offBE0		5	/* Enable byte mask for the comparison with register */
+#define BPC_offBE1		6	/* Enable byte mask for the comparison with register */
+#define BPC_offBE2		7	/* Enable byte mask for the comparison with register */
+#define BPC_offBE3		8	/* Enable byte mask for the comparison with register */
+#define BPC_offT		9	/* Enable breakpoint Embedded Tracer triggering operation */
+
+#define BPC_mskWP		( 0x1  << BPC_offWP )
+#define BPC_mskEL		( 0x1  << BPC_offEL )
+#define BPC_mskS		( 0x1  << BPC_offS )
+#define BPC_mskP		( 0x1  << BPC_offP )
+#define BPC_mskC		( 0x1  << BPC_offC )
+#define BPC_mskBE0		( 0x1  << BPC_offBE0 )
+#define BPC_mskBE1		( 0x1  << BPC_offBE1 )
+#define BPC_mskBE2		( 0x1  << BPC_offBE2 )
+#define BPC_mskBE3		( 0x1  << BPC_offBE3 )
+#define BPC_mskT		( 0x1  << BPC_offT )
+
+/******************************************************************************
+ * dr1+(n*5): BPAn (n=0-7) (Breakpoint Address Register)
+ *****************************************************************************/
+
+	/* These registers contain break point address */
+
+/******************************************************************************
+ * dr2+(n*5): BPAMn (n=0-7) (Breakpoint Address Mask Register)
+ *****************************************************************************/
+
+	/* These registerd contain the address comparison mask for the BPAn register */
+
+/******************************************************************************
+ * dr3+(n*5): BPVn (n=0-7) Breakpoint Data Value Register
+ *****************************************************************************/
+
+	/* The BPVn register contains the data value that will be compared with the
+	 * incoming load/store data value */
+
+/******************************************************************************
+ * dr4+(n*5): BPCIDn (n=0-7) (Breakpoint Context ID Register)
+ *****************************************************************************/
+#define BPCID_offCID		0	/* CID that will be compared with a process's CID */
+/* bit 9:31 reserved */
+
+#define BPCID_mskCID		( 0x1FF  << BPCID_offCID )
+
+/******************************************************************************
+ * dr40: EDM_CFG (EDM Configuration Register)
+ *****************************************************************************/
+#define EDM_CFG_offBC		0	/* Number of hardware breakpoint sets implemented */
+#define EDM_CFG_offDIMU		3	/* Debug Instruction Memory Unit exists */
+/* bit 4:15 reserved */
+#define EDM_CFG_offVER		16	/* EDM version */
+
+#define EDM_CFG_mskBC		( 0x7  << EDM_CFG_offBC )
+#define EDM_CFG_mskDIMU		( 0x1  << EDM_CFG_offDIMU )
+#define EDM_CFG_mskVER		( 0xFFFF  << EDM_CFG_offVER )
+
+/******************************************************************************
+ * dr41: EDMSW (EDM Status Word)
+ *****************************************************************************/
+#define EDMSW_offWV		0	/* Write Valid */
+#define EDMSW_offRV		1	/* Read Valid */
+#define EDMSW_offDE		2	/* Debug exception has occurred for this core */
+/* bit 3:31 reserved */
+
+#define EDMSW_mskWV		( 0x1  << EDMSW_offWV )
+#define EDMSW_mskRV		( 0x1  << EDMSW_offRV )
+#define EDMSW_mskDE		( 0x1  << EDMSW_offDE )
+
+/******************************************************************************
+ * dr42: EDM_CTL (EDM Control Register)
+ *****************************************************************************/
+/* bit 0:30 reserved */
+#define EDM_CTL_offV3_EDM_MODE	6	/* EDM compatibility control bit */
+#define EDM_CTL_offDEH_SEL	31	/* Controls where debug exception is directed to */
+
+#define EDM_CTL_mskV3_EDM_MODE	( 0x1 << EDM_CTL_offV3_EDM_MODE )
+#define EDM_CTL_mskDEH_SEL	( 0x1 << EDM_CTL_offDEH_SEL )
+
+/******************************************************************************
+ * dr43: EDM_DTR (EDM Data Transfer Register)
+ *****************************************************************************/
+
+	/* This is used to exchange data between the embedded EDM logic
+	 * and the processor core */
+
+/******************************************************************************
+ * dr44: BPMTC (Breakpoint Match Trigger Counter Register)
+ *****************************************************************************/
+#define BPMTC_offBPMTC		0	/* Breakpoint match trigger counter value */
+/* bit 16:31 reserved */
+
+#define BPMTC_mskBPMTC		( 0xFFFF  << BPMTC_offBPMTC )
+
+/******************************************************************************
+ * dr45: DIMBR (Debug Instruction Memory Base Register)
+ *****************************************************************************/
+/* bit 0:11 reserved */
+#define DIMBR_offDIMB		12	/* Base address of the Debug Instruction Memory (DIM) */
+#define DIMBR_mskDIMB		( 0xFFFFF  << DIMBR_offDIMB )
+
+/******************************************************************************
+ * dr46: TECR0(Trigger Event Control register 0)
+ * dr47: TECR1 (Trigger Event Control register 1)
+ *****************************************************************************/
+#define TECR_offBP		0	/* Controld which BP is used as a trigger source */
+#define TECR_offNMI		8	/* Use NMI as a trigger source */
+#define TECR_offHWINT		9	/* Corresponding interrupt is used as a trigger source */
+#define TECR_offEVIC		15	/* Enable HWINT as a trigger source in EVIC mode */
+#define TECR_offSYS		16	/* Enable SYSCALL instruction as a trigger source */
+#define TECR_offDBG		17	/* Enable debug exception as a trigger source */
+#define TECR_offMRE		18	/* Enable MMU related exception as a trigger source */
+#define TECR_offE		19	/* An exception is used as a trigger source */
+/* bit 20:30 reserved */
+#define TECR_offL		31	/* Link/Cascade TECR0 trigger event to TECR1 trigger event */
+
+#define TECR_mskBP		( 0xFF  << TECR_offBP )
+#define TECR_mskNMI		( 0x1  << TECR_offBNMI )
+#define TECR_mskHWINT		( 0x3F  << TECR_offBHWINT )
+#define TECR_mskEVIC		( 0x1  << TECR_offBEVIC )
+#define TECR_mskSYS		( 0x1  << TECR_offBSYS )
+#define TECR_mskDBG		( 0x1  << TECR_offBDBG )
+#define TECR_mskMRE		( 0x1  << TECR_offBMRE )
+#define TECR_mskE		( 0x1  << TECR_offE )
+#define TECR_mskL		( 0x1  << TECR_offL )
+
+/******************************************************************************
+ * pfr0-2: PFMC0-2 (Performance Counter Register 0-2)
+ *****************************************************************************/
+
+	/* These registers contains performance event count */
+
+/******************************************************************************
+ * pfr3: PFM_CTL (Performance Counter Control Register)
+ *****************************************************************************/
+#define PFM_CTL_offEN0		0	/* Enable PFMC0 */
+#define PFM_CTL_offEN1		1	/* Enable PFMC1 */
+#define PFM_CTL_offEN2		2	/* Enable PFMC2 */
+#define PFM_CTL_offIE0		3	/* Enable interrupt for PFMC0 */
+#define PFM_CTL_offIE1		4	/* Enable interrupt for PFMC1 */
+#define PFM_CTL_offIE2		5	/* Enable interrupt for PFMC2 */
+#define PFM_CTL_offOVF0		6	/* Overflow bit of PFMC0 */
+#define PFM_CTL_offOVF1		7	/* Overflow bit of PFMC1 */
+#define PFM_CTL_offOVF2		8	/* Overflow bit of PFMC2 */
+#define PFM_CTL_offKS0		9	/* Enable superuser mode event counting for PFMC0 */
+#define PFM_CTL_offKS1		10	/* Enable superuser mode event counting for PFMC1 */
+#define PFM_CTL_offKS2		11	/* Enable superuser mode event counting for PFMC2 */
+#define PFM_CTL_offKU0		12	/* Enable user mode event counting for PFMC0 */
+#define PFM_CTL_offKU1		13	/* Enable user mode event counting for PFMC1 */
+#define PFM_CTL_offKU2		14	/* Enable user mode event counting for PFMC2 */
+#define PFM_CTL_offSEL0		15	/* The event selection for PFMC0 */
+#define PFM_CTL_offSEL1		21	/* The event selection for PFMC1 */
+#define PFM_CTL_offSEL2		27	/* The event selection for PFMC2 */
+/* bit 28:31 reserved */
+
+#define PFM_CTL_mskEN0		( 0x01  << PFM_CTL_offEN0 )
+#define PFM_CTL_mskEN1		( 0x01  << PFM_CTL_offEN1 )
+#define PFM_CTL_mskEN2		( 0x01  << PFM_CTL_offEN2 )
+#define PFM_CTL_mskIE0		( 0x01  << PFM_CTL_offIE0 )
+#define PFM_CTL_mskIE1		( 0x01  << PFM_CTL_offIE1 )
+#define PFM_CTL_mskIE2		( 0x01  << PFM_CTL_offIE2 )
+#define PFM_CTL_mskOVF0		( 0x01  << PFM_CTL_offOVF0 )
+#define PFM_CTL_mskOVF1		( 0x01  << PFM_CTL_offOVF1 )
+#define PFM_CTL_mskOVF2		( 0x01  << PFM_CTL_offOVF2 )
+#define PFM_CTL_mskKS0		( 0x01  << PFM_CTL_offKS0 )
+#define PFM_CTL_mskKS1		( 0x01  << PFM_CTL_offKS1 )
+#define PFM_CTL_mskKS2		( 0x01  << PFM_CTL_offKS2 )
+#define PFM_CTL_mskKU0		( 0x01  << PFM_CTL_offKU0 )
+#define PFM_CTL_mskKU1		( 0x01  << PFM_CTL_offKU1 )
+#define PFM_CTL_mskKU2		( 0x01  << PFM_CTL_offKU2 )
+#define PFM_CTL_mskSEL0		( 0x01  << PFM_CTL_offSEL0 )
+#define PFM_CTL_mskSEL1		( 0x3F  << PFM_CTL_offSEL1 )
+#define PFM_CTL_mskSEL2		( 0x3F  << PFM_CTL_offSEL2 )
+
+/******************************************************************************
+ * SDZ_CTL (Structure Downsizing Control Register)
+ *****************************************************************************/
+#define SDZ_CTL_offICDZ		0	/* I-cache downsizing control */
+#define SDZ_CTL_offDCDZ		3	/* D-cache downsizing control */
+#define SDZ_CTL_offMTBDZ	6	/* MTLB downsizing control */
+#define SDZ_CTL_offBTBDZ	9	/* Branch Target Table downsizing control */
+/* bit 12:31 reserved */
+#define SDZ_CTL_mskICDZ		( 0x07  << SDZ_CTL_offICDZ )
+#define SDZ_CTL_mskDCDZ		( 0x07  << SDZ_CTL_offDCDZ )
+#define SDZ_CTL_mskMTBDZ	( 0x07  << SDZ_CTL_offMTBDZ )
+#define SDZ_CTL_mskBTBDZ	( 0x07  << SDZ_CTL_offBTBDZ )
+
+/******************************************************************************
+ * N13MISC_CTL (N13 Miscellaneous Control Register)
+ *****************************************************************************/
+#define N13MISC_CTL_offBTB	0	/* Disable Branch Target Buffer */
+#define N13MISC_CTL_offRTP	1	/* Disable Return Target Predictor */
+#define N13MISC_CTL_offPTEPF	2	/* Disable HPTWK L2 PTE pefetch */
+#define N13MISC_CTL_offSP_SHADOW_EN	4	/* Enable shadow stack pointers */
+/* bit 6, 9:31 reserved */
+
+#define N13MISC_CTL_makBTB	( 0x1  << N13MISC_CTL_offBTB )
+#define N13MISC_CTL_makRTP	( 0x1  << N13MISC_CTL_offRTP )
+#define N13MISC_CTL_makPTEPF	( 0x1  << N13MISC_CTL_offPTEPF )
+#define N13MISC_CTL_makSP_SHADOW_EN	( 0x1  << N13MISC_CTL_offSP_SHADOW_EN )
+
+#define MISC_init	(N13MISC_CTL_makBTB|N13MISC_CTL_makRTP|N13MISC_CTL_makSP_SHADOW_EN)
+
+/******************************************************************************
+ * PRUSR_ACC_CTL (Privileged Resource User Access Control Registers)
+ *****************************************************************************/
+#define PRUSR_ACC_CTL_offDMA_EN	0	/* Allow user mode access of DMA registers */
+#define PRUSR_ACC_CTL_offPFM_EN	1	/* Allow user mode access of PFM registers */
+
+#define PRUSR_ACC_CTL_mskDMA_EN	( 0x1  << PRUSR_ACC_CTL_offDMA_EN )
+#define PRUSR_ACC_CTL_mskPFM_EN	( 0x1  << PRUSR_ACC_CTL_offPFM_EN )
+
+/******************************************************************************
+ * dmar0: DMA_CFG (DMA Configuration Register)
+ *****************************************************************************/
+#define DMA_CFG_offNCHN		0	/* The number of DMA channels implemented */
+#define DMA_CFG_offUNEA		2	/* Un-aligned External Address transfer feature */
+#define DMA_CFG_off2DET		3	/* 2-D Element Transfer feature */
+/* bit 4:15 reserved */
+#define DMA_CFG_offVER		16	/* DMA architecture and implementation version */
+
+#define DMA_CFG_mskNCHN		( 0x3  << DMA_CFG_offNCHN )
+#define DMA_CFG_mskUNEA		( 0x1  << DMA_CFG_offUNEA )
+#define DMA_CFG_msk2DET		( 0x1  << DMA_CFG_off2DET )
+#define DMA_CFG_mskVER		( 0xFFFF  << DMA_CFG_offVER )
+
+/******************************************************************************
+ * dmar1: DMA_GCSW (DMA Global Control and Status Word Register)
+ *****************************************************************************/
+#define DMA_GCSW_offC0STAT	0	/* DMA channel 0 state */
+#define DMA_GCSW_offC1STAT	3	/* DMA channel 1 state */
+/* bit 6:11 reserved */
+#define DMA_GCSW_offC0INT	12	/* DMA channel 0 generate interrupt */
+#define DMA_GCSW_offC1INT	13	/* DMA channel 1 generate interrupt */
+/* bit 14:30 reserved */
+#define DMA_GCSW_offEN		31	/* Enable DMA engine */
+
+#define DMA_GCSW_mskC0STAT	( 0x7  << DMA_GCSW_offC0STAT )
+#define DMA_GCSW_mskC1STAT	( 0x7  << DMA_GCSW_offC1STAT )
+#define DMA_GCSW_mskC0INT	( 0x1  << DMA_GCSW_offC0INT )
+#define DMA_GCSW_mskC1INT	( 0x1  << DMA_GCSW_offC1INT )
+#define DMA_GCSW_mskEN		( 0x1  << DMA_GCSW_offEN )
+
+/******************************************************************************
+ * dmar2: DMA_CHNSEL (DMA Channel Selection Register)
+ *****************************************************************************/
+#define DMA_CHNSEL_offCHAN	0	/* Selected channel number */
+/* bit 2:31 reserved */
+
+#define DMA_CHNSEL_mskCHAN	( 0x3  << DMA_CHNSEL_offCHAN )
+
+/******************************************************************************
+ * dmar3: DMA_ACT (DMA Action Register)
+ *****************************************************************************/
+#define DMA_ACT_offACMD		0	/* DMA Action Command */
+/* bit 2:31 reserved */
+#define DMA_ACT_mskACMD		( 0x3  << DMA_ACT_offACMD )
+
+/******************************************************************************
+ * dmar4: DMA_SETUP (DMA Setup Register)
+ *****************************************************************************/
+#define DMA_SETUP_offLM		0	/* Local Memory Selection */
+#define DMA_SETUP_offTDIR	1	/* Transfer Direction */
+#define DMA_SETUP_offTES	2	/* Transfer Element Size */
+#define DMA_SETUP_offESTR	4	/* External memory transfer Stride */
+#define DMA_SETUP_offCIE	16	/* Interrupt Enable on Completion */
+#define DMA_SETUP_offSIE	17	/* Interrupt Enable on explicit Stop */
+#define DMA_SETUP_offEIE	18	/* Interrupt Enable on Error */
+#define DMA_SETUP_offUE		19	/* Enable the Un-aligned External Address */
+#define DMA_SETUP_off2DE	20	/* Enable the 2-D External Transfer */
+#define DMA_SETUP_offCOA	21	/* Transfer Coalescable */
+/* bit 22:31 reserved */
+
+#define DMA_SETUP_mskLM		( 0x1  << DMA_SETUP_offLM )
+#define DMA_SETUP_mskTDIR	( 0x1  << DMA_SETUP_offTDIR )
+#define DMA_SETUP_mskTES	( 0x3  << DMA_SETUP_offTES )
+#define DMA_SETUP_mskESTR	( 0xFFF  << DMA_SETUP_offESTR )
+#define DMA_SETUP_mskCIE	( 0x1  << DMA_SETUP_offCIE )
+#define DMA_SETUP_mskSIE	( 0x1  << DMA_SETUP_offSIE )
+#define DMA_SETUP_mskEIE	( 0x1  << DMA_SETUP_offEIE )
+#define DMA_SETUP_mskUE		( 0x1  << DMA_SETUP_offUE )
+#define DMA_SETUP_msk2DE	( 0x1  << DMA_SETUP_off2DE )
+#define DMA_SETUP_mskCOA	( 0x1  << DMA_SETUP_offCOA )
+
+/******************************************************************************
+ * dmar5: DMA_ISADDR (DMA Internal Start Address Register)
+ *****************************************************************************/
+#define DMA_ISADDR_offISADDR	0	/* Internal Start Address */
+/* bit 20:31 reserved */
+#define DMA_ISADDR_mskISADDR	( 0xFFFFF  << DMA_ISADDR_offISADDR )
+
+/******************************************************************************
+ * dmar6: DMA_ESADDR (DMA External Start Address Register)
+ *****************************************************************************/
+/* This register holds External Start Address */
+
+/******************************************************************************
+ * dmar7: DMA_TCNT (DMA Transfer Element Count Register)
+ *****************************************************************************/
+#define DMA_TCNT_offTCNT	0	/* DMA transfer element count */
+/* bit 18:31 reserved */
+#define DMA_TCNT_mskTCNT	( 0x3FFFF  << DMA_TCNT_offTCNT )
+
+/******************************************************************************
+ * dmar8: DMA_STATUS (DMA Status Register)
+ *****************************************************************************/
+#define DMA_STATUS_offSTAT	0	/* DMA channel state */
+#define DMA_STATUS_offSTUNA	3	/* Un-aligned error on External Stride value */
+#define DMA_STATUS_offDERR	4	/* DMA Transfer Disruption Error */
+#define DMA_STATUS_offEUNA	5	/* Un-aligned error on the External address */
+#define DMA_STATUS_offIUNA	6	/* Un-aligned error on the Internal address */
+#define DMA_STATUS_offIOOR	7	/* Out-Of-Range error on the Internal address */
+#define DMA_STATUS_offEBUS	8	/* Bus Error on an External DMA transfer */
+#define DMA_STATUS_offESUP	9	/* DMA setup error */
+/* bit 10:31 reserved */
+
+#define DMA_STATUS_mskSTAT	( 0x7  << DMA_STATUS_offSTAT )
+#define DMA_STATUS_mskSTUNA	( 0x1  << DMDMA_STATUS_offSTUNA )
+#define DMA_STATUS_mskDERR	( 0x1  << DMDMA_STATUS_offDERR )
+#define DMA_STATUS_mskEUNA	( 0x1  << DMDMA_STATUS_offEUNA )
+#define DMA_STATUS_mskIUNA	( 0x1  << DMDMA_STATUS_offIUNA )
+#define DMA_STATUS_mskIOOR	( 0x1  << DMDMA_STATUS_offIOOR )
+#define DMA_STATUS_mskEBUS	( 0x1  << DMDMA_STATUS_offEBUS )
+#define DMA_STATUS_mskESUP	( 0x1  << DMDMA_STATUS_offESUP )
+
+/******************************************************************************
+ * dmar9: DMA_2DSET (DMA 2D Setup Register)
+ *****************************************************************************/
+#define DMA_2DSET_offWECNT	0	/* The Width Element Count for a 2-D region */
+#define DMA_2DSET_offHTSTR	16	/* The Height Stride for a 2-D region */
+
+#define DMA_2DSET_mskHTSTR	( 0xFFFF  << DMA_2DSET_offHTSTR )
+#define DMA_2DSET_mskWECNT	( 0xFFFF  << DMA_2DSET_offWECNT )
+
+/******************************************************************************
+ * dmar10: DMA_2DSCTL (DMA 2D Startup Control Register)
+ *****************************************************************************/
+#define DMA_2DSCTL_offSTWECNT	0	/* Startup Width Element Count for a 2-D region */
+/* bit 16:31 reserved */
+
+#define DMA_2DSCTL_mskSTWECNT	( 0xFFFF  << DMA_2DSCTL_offSTWECNT )
+
+/******************************************************************************
+ * fpcsr: FPCSR (Floating-Point Control Status Register)
+ *****************************************************************************/
+#define FPCSR_offRM		0
+#define FPCSR_offIVO		2
+#define FPCSR_offDBZ		3
+#define FPCSR_offOVF		4
+#define FPCSR_offUDF		5
+#define FPCSR_offIEX		6
+#define FPCSR_offIVOE		7
+#define FPCSR_offDBZE		8
+#define FPCSR_offOVFE		9
+#define FPCSR_offUDFE		10
+#define FPCSR_offIEXE		11
+#define FPCSR_offDNZ		12
+#define FPCSR_offIVOT		13
+#define FPCSR_offDBZT		14
+#define FPCSR_offOVFT		15
+#define FPCSR_offUDFT		16
+#define FPCSR_offIEXT		17
+#define FPCSR_offDNIT		18
+#define FPCSR_offRIT		19
+
+#define FPCSR_mskRM             ( 0x3  << FPCSR_offRM )
+#define FPCSR_mskIVO            ( 0x1  << FPCSR_offIVO )
+#define FPCSR_mskDBZ            ( 0x1  << FPCSR_offDBZ )
+#define FPCSR_mskOVF            ( 0x1  << FPCSR_offOVF )
+#define FPCSR_mskUDF            ( 0x1  << FPCSR_offUDF )
+#define FPCSR_mskIEX            ( 0x1  << FPCSR_offIEX )
+#define FPCSR_mskIVOE           ( 0x1  << FPCSR_offIVOE )
+#define FPCSR_mskDBZE           ( 0x1  << FPCSR_offDBZE )
+#define FPCSR_mskOVFE           ( 0x1  << FPCSR_offOVFE )
+#define FPCSR_mskUDFE           ( 0x1  << FPCSR_offUDFE )
+#define FPCSR_mskIEXE           ( 0x1  << FPCSR_offIEXE )
+#define FPCSR_mskDNZ            ( 0x1  << FPCSR_offDNZ )
+#define FPCSR_mskIVOT           ( 0x1  << FPCSR_offIVOT )
+#define FPCSR_mskDBZT           ( 0x1  << FPCSR_offDBZT )
+#define FPCSR_mskOVFT           ( 0x1  << FPCSR_offOVFT )
+#define FPCSR_mskUDFT           ( 0x1  << FPCSR_offUDFT )
+#define FPCSR_mskIEXT           ( 0x1  << FPCSR_offIEXT )
+#define FPCSR_mskDNIT           ( 0x1  << FPCSR_offDNIT )
+#define FPCSR_mskRIT		( 0x1  << FPCSR_offRIT )
+#define FPCSR_mskALL		(FPCSR_mskIVO | FPCSR_mskDBZ | FPCSR_mskOVF | FPCSR_mskUDF | FPCSR_mskIEX)
+#define FPCSR_mskALLE		(FPCSR_mskIVOE | FPCSR_mskDBZE | FPCSR_mskOVFE | FPCSR_mskUDFE | FPCSR_mskIEXE)
+#define FPCSR_mskALLT           (FPCSR_mskIVOT | FPCSR_mskDBZT | FPCSR_mskOVFT | FPCSR_mskUDFT | FPCSR_mskIEXT |FPCSR_mskDNIT | FPCSR_mskRIT)
+
+/******************************************************************************
+ * fpcfg: FPCFG (Floating-Point Configuration Register)
+ *****************************************************************************/
+#define	FPCFG_offSP		0
+#define FPCFG_offDP		1
+#define FPCFG_offFREG		2
+#define FPCFG_offFMA		4
+#define FPCFG_offIMVER		22
+#define FPCFG_offAVER		27
+
+#define FPCFG_mskSP		( 0x1  << FPCFG_offSP )
+#define FPCFG_mskDP		( 0x1  << FPCFG_offDP )
+#define FPCFG_mskFREG		( 0x3  << FPCFG_offFREG )
+#define FPCFG_mskFMA		( 0x1  << FPCFG_offFMA )
+#define FPCFG_mskIMVER		( 0x1F  << FPCFG_offIMVER )
+#define FPCFG_mskAVER		( 0x1F  << FPCFG_offAVER )
+
+/******************************************************************************
+ * fucpr: FUCOP_CTL (FPU and Coprocessor Enable Control Register)
+ *****************************************************************************/
+#define FUCOP_CTL_offCP0EN	0
+#define FUCOP_CTL_offCP1EN	1
+#define FUCOP_CTL_offCP2EN	2
+#define FUCOP_CTL_offCP3EN	3
+#define FUCOP_CTL_offAUEN	31
+
+#define FUCOP_CTL_mskCP0EN	( 0x1  << FUCOP_CTL_offCP0EN )
+#define FUCOP_CTL_mskCP1EN	( 0x1  << FUCOP_CTL_offCP1EN )
+#define FUCOP_CTL_mskCP2EN      ( 0x1  << FUCOP_CTL_offCP2EN )
+#define FUCOP_CTL_mskCP3EN      ( 0x1  << FUCOP_CTL_offCP3EN )
+#define FUCOP_CTL_mskAUEN       ( 0x1  << FUCOP_CTL_offAUEN )
+
+#endif /* __NDS32_BITFIELD_H__ */
diff --git a/arch/nds32/include/asm/cache.h b/arch/nds32/include/asm/cache.h
new file mode 100644
index 0000000..347db48
--- /dev/null
+++ b/arch/nds32/include/asm/cache.h
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __NDS32_CACHE_H__
+#define __NDS32_CACHE_H__
+
+#define L1_CACHE_BYTES	32
+#define L1_CACHE_SHIFT	5
+
+#define ARCH_DMA_MINALIGN   L1_CACHE_BYTES
+
+#endif /* __NDS32_CACHE_H__ */
diff --git a/arch/nds32/include/asm/cache_info.h b/arch/nds32/include/asm/cache_info.h
new file mode 100644
index 0000000..38ec458
--- /dev/null
+++ b/arch/nds32/include/asm/cache_info.h
@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+struct cache_info {
+	unsigned char ways;
+	unsigned char line_size;
+	unsigned short sets;
+	unsigned short size;
+#if defined(CONFIG_CPU_CACHE_ALIASING)
+	unsigned short aliasing_num;
+	unsigned int aliasing_mask;
+#endif
+};
diff --git a/arch/nds32/include/asm/cacheflush.h b/arch/nds32/include/asm/cacheflush.h
new file mode 100644
index 0000000..7b9b20a
--- /dev/null
+++ b/arch/nds32/include/asm/cacheflush.h
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __NDS32_CACHEFLUSH_H__
+#define __NDS32_CACHEFLUSH_H__
+
+#include <linux/mm.h>
+
+#define PG_dcache_dirty PG_arch_1
+
+#ifdef CONFIG_CPU_CACHE_ALIASING
+void flush_cache_mm(struct mm_struct *mm);
+void flush_cache_dup_mm(struct mm_struct *mm);
+void flush_cache_range(struct vm_area_struct *vma,
+		       unsigned long start, unsigned long end);
+void flush_cache_page(struct vm_area_struct *vma,
+		      unsigned long addr, unsigned long pfn);
+void flush_cache_kmaps(void);
+void flush_cache_vmap(unsigned long start, unsigned long end);
+void flush_cache_vunmap(unsigned long start, unsigned long end);
+
+#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
+void flush_dcache_page(struct page *page);
+void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
+		       unsigned long vaddr, void *dst, void *src, int len);
+void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
+			 unsigned long vaddr, void *dst, void *src, int len);
+
+#define ARCH_HAS_FLUSH_ANON_PAGE
+void flush_anon_page(struct vm_area_struct *vma,
+		     struct page *page, unsigned long vaddr);
+
+#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
+void flush_kernel_dcache_page(struct page *page);
+void flush_icache_range(unsigned long start, unsigned long end);
+void flush_icache_page(struct vm_area_struct *vma, struct page *page);
+#define flush_dcache_mmap_lock(mapping)   spin_lock_irq(&(mapping)->tree_lock)
+#define flush_dcache_mmap_unlock(mapping) spin_unlock_irq(&(mapping)->tree_lock)
+
+#else
+#include <asm-generic/cacheflush.h>
+#endif
+
+#endif /* __NDS32_CACHEFLUSH_H__ */
diff --git a/arch/nds32/include/asm/current.h b/arch/nds32/include/asm/current.h
new file mode 100644
index 0000000..b4dcd22
--- /dev/null
+++ b/arch/nds32/include/asm/current.h
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef _ASM_NDS32_CURRENT_H
+#define _ASM_NDS32_CURRENT_H
+
+#ifndef __ASSEMBLY__
+register struct task_struct *current asm("$r25");
+#endif /* __ASSEMBLY__ */
+#define tsk $r25
+
+#endif /* _ASM_NDS32_CURRENT_H */
diff --git a/arch/nds32/include/asm/delay.h b/arch/nds32/include/asm/delay.h
new file mode 100644
index 0000000..519ba97
--- /dev/null
+++ b/arch/nds32/include/asm/delay.h
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __NDS32_DELAY_H__
+#define __NDS32_DELAY_H__
+
+#include <asm/param.h>
+
+/* There is no clocksource cycle counter in the CPU. */
+static inline void __delay(unsigned long loops)
+{
+	__asm__ __volatile__(".align 2\n"
+			     "1:\n"
+			     "\taddi\t%0, %0, -1\n"
+			     "\tbgtz\t%0, 1b\n"
+			     :"=r"(loops)
+			     :"0"(loops));
+}
+
+static inline void __udelay(unsigned long usecs, unsigned long lpj)
+{
+	usecs *= (unsigned long)(((0x8000000000000000ULL / (500000 / HZ)) +
+				  0x80000000ULL) >> 32);
+	usecs = (unsigned long)(((unsigned long long)usecs * lpj) >> 32);
+	__delay(usecs);
+}
+
+#define udelay(usecs) __udelay((usecs), loops_per_jiffy)
+
+/* make sure "usecs *= ..." in udelay do not overflow. */
+#if HZ >= 1000
+#define MAX_UDELAY_MS	1
+#elif HZ <= 200
+#define MAX_UDELAY_MS	5
+#else
+#define MAX_UDELAY_MS	(1000 / HZ)
+#endif
+
+#endif
diff --git a/arch/nds32/include/asm/dma-mapping.h b/arch/nds32/include/asm/dma-mapping.h
new file mode 100644
index 0000000..2dd47d24
--- /dev/null
+++ b/arch/nds32/include/asm/dma-mapping.h
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef ASMNDS32_DMA_MAPPING_H
+#define ASMNDS32_DMA_MAPPING_H
+
+extern struct dma_map_ops nds32_dma_ops;
+
+static inline struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
+{
+	return &nds32_dma_ops;
+}
+
+#endif
diff --git a/arch/nds32/include/asm/elf.h b/arch/nds32/include/asm/elf.h
new file mode 100644
index 0000000..56c4790
--- /dev/null
+++ b/arch/nds32/include/asm/elf.h
@@ -0,0 +1,171 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __ASMNDS32_ELF_H
+#define __ASMNDS32_ELF_H
+
+/*
+ * ELF register definitions..
+ */
+
+#include <asm/ptrace.h>
+
+typedef unsigned long elf_greg_t;
+typedef unsigned long elf_freg_t[3];
+
+extern unsigned int elf_hwcap;
+
+#define EM_NDS32			167
+
+#define R_NDS32_NONE			0
+#define R_NDS32_16_RELA			19
+#define R_NDS32_32_RELA			20
+#define R_NDS32_9_PCREL_RELA		22
+#define R_NDS32_15_PCREL_RELA		23
+#define R_NDS32_17_PCREL_RELA		24
+#define R_NDS32_25_PCREL_RELA		25
+#define R_NDS32_HI20_RELA		26
+#define R_NDS32_LO12S3_RELA		27
+#define R_NDS32_LO12S2_RELA		28
+#define R_NDS32_LO12S1_RELA		29
+#define R_NDS32_LO12S0_RELA		30
+#define R_NDS32_SDA15S3_RELA    	31
+#define R_NDS32_SDA15S2_RELA    	32
+#define R_NDS32_SDA15S1_RELA    	33
+#define R_NDS32_SDA15S0_RELA    	34
+#define R_NDS32_GOT20			37
+#define R_NDS32_25_PLTREL		38
+#define R_NDS32_COPY			39
+#define R_NDS32_GLOB_DAT		40
+#define R_NDS32_JMP_SLOT		41
+#define R_NDS32_RELATIVE		42
+#define R_NDS32_GOTOFF			43
+#define R_NDS32_GOTPC20			44
+#define R_NDS32_GOT_HI20		45
+#define R_NDS32_GOT_LO12		46
+#define R_NDS32_GOTPC_HI20		47
+#define R_NDS32_GOTPC_LO12		48
+#define R_NDS32_GOTOFF_HI20		49
+#define R_NDS32_GOTOFF_LO12		50
+#define R_NDS32_INSN16			51
+#define R_NDS32_LABEL			52
+#define R_NDS32_LONGCALL1		53
+#define R_NDS32_LONGCALL2		54
+#define R_NDS32_LONGCALL3		55
+#define R_NDS32_LONGJUMP1		56
+#define R_NDS32_LONGJUMP2		57
+#define R_NDS32_LONGJUMP3		58
+#define R_NDS32_LOADSTORE		59
+#define R_NDS32_9_FIXED_RELA		60
+#define R_NDS32_15_FIXED_RELA		61
+#define R_NDS32_17_FIXED_RELA		62
+#define R_NDS32_25_FIXED_RELA		63
+#define R_NDS32_PLTREL_HI20		64
+#define R_NDS32_PLTREL_LO12		65
+#define R_NDS32_PLT_GOTREL_HI20		66
+#define R_NDS32_PLT_GOTREL_LO12		67
+#define R_NDS32_LO12S0_ORI_RELA		72
+#define R_NDS32_DWARF2_OP1_RELA     	77
+#define R_NDS32_DWARF2_OP2_RELA     	78
+#define R_NDS32_DWARF2_LEB_RELA     	79
+#define R_NDS32_WORD_9_PCREL_RELA	94
+#define R_NDS32_LONGCALL4 		107
+#define R_NDS32_RELA_NOP_MIX		192
+#define R_NDS32_RELA_NOP_MAX		255
+
+#define ELF_NGREG (sizeof (struct user_pt_regs) / sizeof(elf_greg_t))
+#define ELF_CORE_COPY_REGS(dest, regs)	\
+	*(struct user_pt_regs *)&(dest) = (regs)->user_regs;
+
+typedef elf_greg_t elf_gregset_t[ELF_NGREG];
+
+/* Core file format: The core file is written in such a way that gdb
+   can understand it and provide useful information to the user (under
+   linux we use the 'trad-core' bfd).  There are quite a number of
+   obstacles to being able to view the contents of the floating point
+   registers, and until these are solved you will not be able to view the
+   contents of them.  Actually, you can read in the core file and look at
+   the contents of the user struct to find out what the floating point
+   registers contain.
+   The actual file contents are as follows:
+   UPAGE: 1 page consisting of a user struct that tells gdb what is present
+   in the file.  Directly after this is a copy of the task_struct, which
+   is currently not used by gdb, but it may come in useful at some point.
+   All of the registers are stored as part of the upage.  The upage should
+   always be only one page.
+   DATA: The data area is stored.  We use current->end_text to
+   current->brk to pick up all of the user variables, plus any memory
+   that may have been malloced.  No attempt is made to determine if a page
+   is demand-zero or if a page is totally unused, we just cover the entire
+   range.  All of the addresses are rounded in such a way that an integral
+   number of pages is written.
+   STACK: We need the stack information in order to get a meaningful
+   backtrace.  We need to write the data from (esp) to
+   current->start_stack, so we round each of these off in order to be able
+   to write an integer number of pages.
+   The minimum core file size is 3 pages, or 12288 bytes.
+*/
+
+struct user_fp {
+        unsigned long long fd_regs[32];
+        unsigned long fpcsr;
+};
+
+typedef struct user_fp elf_fpregset_t;
+
+struct elf32_hdr;
+#define elf_check_arch(x)		((x)->e_machine == EM_NDS32)
+
+/*
+ * These are used to set parameters in the core dumps.
+ */
+#define ELF_CLASS	ELFCLASS32
+#ifdef __NDS32_EB__
+#define ELF_DATA	ELFDATA2MSB;
+#else
+#define ELF_DATA	ELFDATA2LSB;
+#endif
+#define ELF_ARCH	EM_NDS32
+#define USE_ELF_CORE_DUMP
+#define ELF_EXEC_PAGESIZE	PAGE_SIZE
+
+/* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
+   use of this is to invoke "./ld.so someprog" to test out a new version of
+   the loader.  We need to make sure that it is out of the way of the program
+   that it will "exec", and that there is sufficient room for the brk.  */
+
+#define ELF_ET_DYN_BASE	(2 * TASK_SIZE / 3)
+
+/* When the program starts, a1 contains a pointer to a function to be
+   registered with atexit, as per the SVR4 ABI.  A value of 0 means we
+   have no such handler.  */
+#define ELF_PLAT_INIT(_r, load_addr)	(_r)->uregs[0] = 0
+
+/* This yields a mask that user programs can use to figure out what
+   instruction set this cpu supports. */
+
+#define ELF_HWCAP	(elf_hwcap)
+
+#ifdef __KERNEL__
+
+#define ELF_PLATFORM    (NULL)
+
+/* Old NetWinder binaries were compiled in such a way that the iBCS
+   heuristic always trips on them.  Until these binaries become uncommon
+   enough not to care, don't trust the `ibcs' flag here.  In any case
+   there is no other ELF system currently supported by iBCS.
+   @@ Could print a warning message to encourage users to upgrade.  */
+#define SET_PERSONALITY(ex)	set_personality(PER_LINUX)
+
+#endif
+
+#define ARCH_DLINFO						\
+do {								\
+	NEW_AUX_ENT(AT_SYSINFO_EHDR,				\
+		    (elf_addr_t)current->mm->context.vdso);	\
+} while (0)
+#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
+struct linux_binprm;
+int arch_setup_additional_pages(struct linux_binprm *, int);
+
+#endif
diff --git a/arch/nds32/include/asm/fixmap.h b/arch/nds32/include/asm/fixmap.h
new file mode 100644
index 0000000..0e60e15
--- /dev/null
+++ b/arch/nds32/include/asm/fixmap.h
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __ASM_NDS32_FIXMAP_H
+#define __ASM_NDS32_FIXMAP_H
+
+#ifdef CONFIG_HIGHMEM
+#include <linux/threads.h>
+#include <asm/kmap_types.h>
+#endif
+
+enum fixed_addresses {
+	FIX_HOLE,
+	FIX_KMAP_RESERVED,
+	FIX_KMAP_BEGIN,
+#ifdef CONFIG_HIGHMEM
+	FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS),
+#endif
+	FIX_EARLYCON_MEM_BASE,
+	__end_of_fixed_addresses
+};
+#define FIXADDR_TOP             ((unsigned long) (-(16 * PAGE_SIZE)))
+#define FIXADDR_SIZE		((__end_of_fixed_addresses) << PAGE_SHIFT)
+#define FIXADDR_START		(FIXADDR_TOP - FIXADDR_SIZE)
+#define FIXMAP_PAGE_IO		__pgprot(PAGE_DEVICE)
+void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
+
+#include <asm-generic/fixmap.h>
+#endif /* __ASM_NDS32_FIXMAP_H */
diff --git a/arch/nds32/include/asm/futex.h b/arch/nds32/include/asm/futex.h
new file mode 100644
index 0000000..eab5e84
--- /dev/null
+++ b/arch/nds32/include/asm/futex.h
@@ -0,0 +1,103 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __NDS32_FUTEX_H__
+#define __NDS32_FUTEX_H__
+
+#include <linux/futex.h>
+#include <linux/uaccess.h>
+#include <asm/errno.h>
+
+#define __futex_atomic_ex_table(err_reg)			\
+	"	.pushsection __ex_table,\"a\"\n"		\
+	"	.align	3\n"					\
+	"	.long	1b, 4f\n"				\
+	"	.long	2b, 4f\n"				\
+	"	.popsection\n"					\
+	"	.pushsection .fixup,\"ax\"\n"			\
+	"4:	move	%0, " err_reg "\n"			\
+	"	j	3b\n"					\
+	"	.popsection"
+
+#define __futex_atomic_op(insn, ret, oldval, tmp, uaddr, oparg)	\
+	smp_mb();						\
+	asm volatile(					\
+	"	movi	$ta, #0\n"				\
+	"1:	llw	%1, [%2+$ta]\n"				\
+	"	" insn "\n"					\
+	"2:	scw	%0, [%2+$ta]\n"				\
+	"	beqz	%0, 1b\n"				\
+	"	movi	%0, #0\n"				\
+	"3:\n"							\
+	__futex_atomic_ex_table("%4")				\
+	: "=&r" (ret), "=&r" (oldval)				\
+	: "r" (uaddr), "r" (oparg), "i" (-EFAULT)		\
+	: "cc", "memory")
+static inline int
+futex_atomic_cmpxchg_inatomic(u32 * uval, u32 __user * uaddr,
+			      u32 oldval, u32 newval)
+{
+	int ret = 0;
+	u32 val, tmp, flags;
+
+	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
+		return -EFAULT;
+
+	smp_mb();
+	asm volatile ("       movi    $ta, #0\n"
+		      "1:     llw     %1, [%6 + $ta]\n"
+		      "       sub     %3, %1, %4\n"
+		      "       cmovz   %2, %5, %3\n"
+		      "       cmovn   %2, %1, %3\n"
+		      "2:     scw     %2, [%6 + $ta]\n"
+		      "       beqz    %2, 1b\n"
+		      "3:\n                   " __futex_atomic_ex_table("%7")
+		      :"+&r"(ret), "=&r"(val), "=&r"(tmp), "=&r"(flags)
+		      :"r"(oldval), "r"(newval), "r"(uaddr), "i"(-EFAULT)
+		      :"$ta", "memory");
+	smp_mb();
+
+	*uval = val;
+	return ret;
+}
+
+static inline int
+arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
+{
+	int oldval = 0, ret;
+
+
+	pagefault_disable();
+	switch (op) {
+	case FUTEX_OP_SET:
+		__futex_atomic_op("move	%0, %3", ret, oldval, tmp, uaddr,
+				  oparg);
+		break;
+	case FUTEX_OP_ADD:
+		__futex_atomic_op("add	%0, %1, %3", ret, oldval, tmp, uaddr,
+				  oparg);
+		break;
+	case FUTEX_OP_OR:
+		__futex_atomic_op("or	%0, %1, %3", ret, oldval, tmp, uaddr,
+				  oparg);
+		break;
+	case FUTEX_OP_ANDN:
+		__futex_atomic_op("and	%0, %1, %3", ret, oldval, tmp, uaddr,
+				  ~oparg);
+		break;
+	case FUTEX_OP_XOR:
+		__futex_atomic_op("xor	%0, %1, %3", ret, oldval, tmp, uaddr,
+				  oparg);
+		break;
+	default:
+		ret = -ENOSYS;
+	}
+
+	pagefault_enable();
+
+	if (!ret)
+		*oval = oldval;
+
+	return ret;
+}
+#endif /* __NDS32_FUTEX_H__ */
diff --git a/arch/nds32/include/asm/highmem.h b/arch/nds32/include/asm/highmem.h
new file mode 100644
index 0000000..425d546
--- /dev/null
+++ b/arch/nds32/include/asm/highmem.h
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef _ASM_HIGHMEM_H
+#define _ASM_HIGHMEM_H
+
+#include <asm/proc-fns.h>
+#include <asm/kmap_types.h>
+#include <asm/fixmap.h>
+#include <asm/pgtable.h>
+
+/*
+ * Right now we initialize only a single pte table. It can be extended
+ * easily, subsequent pte tables have to be allocated in one physical
+ * chunk of RAM.
+ */
+/*
+ * Ordering is (from lower to higher memory addresses):
+ *
+ * high_memory
+ *			Persistent kmap area
+ * PKMAP_BASE
+ *			fixed_addresses
+ * FIXADDR_START
+ * FIXADDR_TOP
+ *			Vmalloc area
+ * VMALLOC_START
+ * VMALLOC_END
+ */
+#define PKMAP_BASE		((FIXADDR_START - PGDIR_SIZE) & (PGDIR_MASK))
+#define LAST_PKMAP		PTRS_PER_PTE
+#define LAST_PKMAP_MASK		(LAST_PKMAP - 1)
+#define PKMAP_NR(virt)		(((virt) - (PKMAP_BASE)) >> PAGE_SHIFT)
+#define PKMAP_ADDR(nr)		(PKMAP_BASE + ((nr) << PAGE_SHIFT))
+#define kmap_prot		PAGE_KERNEL
+
+static inline void flush_cache_kmaps(void)
+{
+	cpu_dcache_wbinval_all();
+}
+
+/* declarations for highmem.c */
+extern unsigned long highstart_pfn, highend_pfn;
+
+extern pte_t *pkmap_page_table;
+
+extern void *kmap_high(struct page *page);
+extern void kunmap_high(struct page *page);
+
+extern void kmap_init(void);
+
+/*
+ * The following functions are already defined by <linux/highmem.h>
+ * when CONFIG_HIGHMEM is not set.
+ */
+#ifdef CONFIG_HIGHMEM
+extern void *kmap(struct page *page);
+extern void kunmap(struct page *page);
+extern void *kmap_atomic(struct page *page);
+extern void __kunmap_atomic(void *kvaddr);
+extern void *kmap_atomic_pfn(unsigned long pfn);
+extern struct page *kmap_atomic_to_page(void *ptr);
+#endif
+
+#endif
diff --git a/arch/nds32/include/asm/io.h b/arch/nds32/include/asm/io.h
new file mode 100644
index 0000000..966e71b
--- /dev/null
+++ b/arch/nds32/include/asm/io.h
@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __ASM_NDS32_IO_H
+#define __ASM_NDS32_IO_H
+
+extern void iounmap(volatile void __iomem *addr);
+#define __raw_writeb __raw_writeb
+static inline void __raw_writeb(u8 val, volatile void __iomem *addr)
+{
+	asm volatile("sbi %0, [%1]" : : "r" (val), "r" (addr));
+}
+
+#define __raw_writew __raw_writew
+static inline void __raw_writew(u16 val, volatile void __iomem *addr)
+{
+	asm volatile("shi %0, [%1]" : : "r" (val), "r" (addr));
+}
+
+#define __raw_writel __raw_writel
+static inline void __raw_writel(u32 val, volatile void __iomem *addr)
+{
+	asm volatile("swi %0, [%1]" : : "r" (val), "r" (addr));
+}
+
+#define __raw_readb __raw_readb
+static inline u8 __raw_readb(const volatile void __iomem *addr)
+{
+	u8 val;
+
+	asm volatile("lbi %0, [%1]" : "=r" (val) : "r" (addr));
+	return val;
+}
+
+#define __raw_readw __raw_readw
+static inline u16 __raw_readw(const volatile void __iomem *addr)
+{
+	u16 val;
+
+	asm volatile("lhi %0, [%1]" : "=r" (val) : "r" (addr));
+	return val;
+}
+
+#define __raw_readl __raw_readl
+static inline u32 __raw_readl(const volatile void __iomem *addr)
+{
+	u32 val;
+
+	asm volatile("lwi %0, [%1]" : "=r" (val) : "r" (addr));
+	return val;
+}
+
+#define __iormb()               rmb()
+#define __iowmb()               wmb()
+
+#define mmiowb()        __asm__ __volatile__ ("msync all" : : : "memory");
+
+/*
+ * {read,write}{b,w,l,q}_relaxed() are like the regular version, but
+ * are not guaranteed to provide ordering against spinlocks or memory
+ * accesses.
+ */
+
+#define readb_relaxed(c)	({ u8  __v = __raw_readb(c); __v; })
+#define readw_relaxed(c)	({ u16 __v = le16_to_cpu((__force __le16)__raw_readw(c)); __v; })
+#define readl_relaxed(c)	({ u32 __v = le32_to_cpu((__force __le32)__raw_readl(c)); __v; })
+#define writeb_relaxed(v,c)	((void)__raw_writeb((v),(c)))
+#define writew_relaxed(v,c)	((void)__raw_writew((__force u16)cpu_to_le16(v),(c)))
+#define writel_relaxed(v,c)	((void)__raw_writel((__force u32)cpu_to_le32(v),(c)))
+
+/*
+ * {read,write}{b,w,l,q}() access little endian memory and return result in
+ * native endianness.
+ */
+#define readb(c)	({ u8  __v = readb_relaxed(c); __iormb(); __v; })
+#define readw(c)	({ u16 __v = readw_relaxed(c); __iormb(); __v; })
+#define readl(c)	({ u32 __v = readl_relaxed(c); __iormb(); __v; })
+
+#define writeb(v,c)	({ __iowmb(); writeb_relaxed((v),(c)); })
+#define writew(v,c)	({ __iowmb(); writew_relaxed((v),(c)); })
+#define writel(v,c)	({ __iowmb(); writel_relaxed((v),(c)); })
+#include <asm-generic/io.h>
+#endif /* __ASM_NDS32_IO_H */
diff --git a/arch/nds32/include/asm/irqflags.h b/arch/nds32/include/asm/irqflags.h
new file mode 100644
index 0000000..2bfd00f
--- /dev/null
+++ b/arch/nds32/include/asm/irqflags.h
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <asm/nds32.h>
+#include <nds32_intrinsic.h>
+
+#define arch_local_irq_disable()	\
+	GIE_DISABLE();
+
+#define arch_local_irq_enable()	\
+	GIE_ENABLE();
+static inline unsigned long arch_local_irq_save(void)
+{
+	unsigned long flags;
+	flags = __nds32__mfsr(NDS32_SR_PSW) & PSW_mskGIE;
+	GIE_DISABLE();
+	return flags;
+}
+
+static inline unsigned long arch_local_save_flags(void)
+{
+	unsigned long flags;
+	flags = __nds32__mfsr(NDS32_SR_PSW) & PSW_mskGIE;
+	return flags;
+}
+
+static inline void arch_local_irq_restore(unsigned long flags)
+{
+	if(flags)
+		GIE_ENABLE();
+}
+
+static inline int arch_irqs_disabled_flags(unsigned long flags)
+{
+	return !flags;
+}
diff --git a/arch/nds32/include/asm/l2_cache.h b/arch/nds32/include/asm/l2_cache.h
new file mode 100644
index 0000000..37dd5ef
--- /dev/null
+++ b/arch/nds32/include/asm/l2_cache.h
@@ -0,0 +1,137 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef L2_CACHE_H
+#define L2_CACHE_H
+
+/* CCTL_CMD_OP */
+#define L2_CA_CONF_OFF		0x0
+#define L2_IF_CONF_OFF		0x4
+#define L2CC_SETUP_OFF		0x8
+#define L2CC_PROT_OFF		0xC
+#define L2CC_CTRL_OFF		0x10
+#define L2_INT_EN_OFF           0x20
+#define L2_STA_OFF              0x24
+#define RDERR_ADDR_OFF		0x28
+#define WRERR_ADDR_OFF		0x2c
+#define EVDPTERR_ADDR_OFF	0x30
+#define IMPL3ERR_ADDR_OFF	0x34
+#define L2_CNT0_CTRL_OFF        0x40
+#define L2_EVNT_CNT0_OFF        0x44
+#define L2_CNT1_CTRL_OFF        0x48
+#define L2_EVNT_CNT1_OFF        0x4c
+#define L2_CCTL_CMD_OFF		0x60
+#define L2_CCTL_STATUS_OFF	0x64
+#define L2_LINE_TAG_OFF		0x68
+#define L2_LINE_DPT_OFF		0x70
+
+#define CCTL_CMD_L2_IX_INVAL    0x0
+#define CCTL_CMD_L2_PA_INVAL    0x1
+#define CCTL_CMD_L2_IX_WB       0x2
+#define CCTL_CMD_L2_PA_WB       0x3
+#define CCTL_CMD_L2_PA_WBINVAL  0x5
+#define CCTL_CMD_L2_SYNC        0xa
+
+/* CCTL_CMD_TYPE */
+#define CCTL_SINGLE_CMD         0
+#define CCTL_BLOCK_CMD          0x10
+#define CCTL_ALL_CMD		0x10
+
+/******************************************************************************
+ * L2_CA_CONF (Cache architecture configuration)
+ *****************************************************************************/
+#define L2_CA_CONF_offL2SET		0
+#define L2_CA_CONF_offL2WAY		4
+#define L2_CA_CONF_offL2CLSZ            8
+#define L2_CA_CONF_offL2DW		11
+#define L2_CA_CONF_offL2PT		14
+#define L2_CA_CONF_offL2VER		16
+
+#define L2_CA_CONF_mskL2SET	(0xFUL << L2_CA_CONF_offL2SET)
+#define L2_CA_CONF_mskL2WAY	(0xFUL << L2_CA_CONF_offL2WAY)
+#define L2_CA_CONF_mskL2CLSZ    (0x7UL << L2_CA_CONF_offL2CLSZ)
+#define L2_CA_CONF_mskL2DW	(0x7UL << L2_CA_CONF_offL2DW)
+#define L2_CA_CONF_mskL2PT	(0x3UL << L2_CA_CONF_offL2PT)
+#define L2_CA_CONF_mskL2VER	(0xFFFFUL << L2_CA_CONF_offL2VER)
+
+/******************************************************************************
+ * L2CC_SETUP (L2CC Setup register)
+ *****************************************************************************/
+#define L2CC_SETUP_offPART              0
+#define L2CC_SETUP_mskPART              (0x3UL << L2CC_SETUP_offPART)
+#define L2CC_SETUP_offDDLATC            4
+#define L2CC_SETUP_mskDDLATC            (0x3UL << L2CC_SETUP_offDDLATC)
+#define L2CC_SETUP_offTDLATC            8
+#define L2CC_SETUP_mskTDLATC            (0x3UL << L2CC_SETUP_offTDLATC)
+
+/******************************************************************************
+ * L2CC_PROT (L2CC Protect register)
+ *****************************************************************************/
+#define L2CC_PROT_offMRWEN              31
+#define L2CC_PROT_mskMRWEN      (0x1UL << L2CC_PROT_offMRWEN)
+
+/******************************************************************************
+ * L2_CCTL_STATUS_Mn (The L2CCTL command working status for Master n)
+ *****************************************************************************/
+#define L2CC_CTRL_offEN                 31
+#define L2CC_CTRL_mskEN                 (0x1UL << L2CC_CTRL_offEN)
+
+/******************************************************************************
+ * L2_CCTL_STATUS_Mn (The L2CCTL command working status for Master n)
+ *****************************************************************************/
+#define L2_CCTL_STATUS_offCMD_COMP      31
+#define L2_CCTL_STATUS_mskCMD_COMP      (0x1 << L2_CCTL_STATUS_offCMD_COMP)
+
+extern void __iomem *atl2c_base;
+#include <linux/smp.h>
+#include <asm/io.h>
+#include <asm/bitfield.h>
+
+#define L2C_R_REG(offset)               readl(atl2c_base + offset)
+#define L2C_W_REG(offset, value)        writel(value, atl2c_base + offset)
+
+#define L2_CMD_RDY()    \
+        do{;}while((L2C_R_REG(L2_CCTL_STATUS_OFF) & L2_CCTL_STATUS_mskCMD_COMP) == 0)
+
+static inline unsigned long L2_CACHE_SET(void)
+{
+	return 64 << ((L2C_R_REG(L2_CA_CONF_OFF) & L2_CA_CONF_mskL2SET) >>
+		      L2_CA_CONF_offL2SET);
+}
+
+static inline unsigned long L2_CACHE_WAY(void)
+{
+	return 1 +
+	    ((L2C_R_REG(L2_CA_CONF_OFF) & L2_CA_CONF_mskL2WAY) >>
+	     L2_CA_CONF_offL2WAY);
+}
+
+static inline unsigned long L2_CACHE_LINE_SIZE(void)
+{
+
+	return 4 << ((L2C_R_REG(L2_CA_CONF_OFF) & L2_CA_CONF_mskL2CLSZ) >>
+		     L2_CA_CONF_offL2CLSZ);
+}
+
+static inline unsigned long GET_L2CC_CTRL_CPU(unsigned long cpu)
+{
+	if (cpu == smp_processor_id())
+		return L2C_R_REG(L2CC_CTRL_OFF);
+	return L2C_R_REG(L2CC_CTRL_OFF + (cpu << 8));
+}
+
+static inline void SET_L2CC_CTRL_CPU(unsigned long cpu, unsigned long val)
+{
+	if (cpu == smp_processor_id())
+		L2C_W_REG(L2CC_CTRL_OFF, val);
+	else
+		L2C_W_REG(L2CC_CTRL_OFF + (cpu << 8), val);
+}
+
+static inline unsigned long GET_L2CC_STATUS_CPU(unsigned long cpu)
+{
+	if (cpu == smp_processor_id())
+		return L2C_R_REG(L2_CCTL_STATUS_OFF);
+	return L2C_R_REG(L2_CCTL_STATUS_OFF + (cpu << 8));
+}
+#endif
diff --git a/arch/nds32/include/asm/linkage.h b/arch/nds32/include/asm/linkage.h
new file mode 100644
index 0000000..e708c8b
--- /dev/null
+++ b/arch/nds32/include/asm/linkage.h
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __ASM_LINKAGE_H
+#define __ASM_LINKAGE_H
+
+/* This file is required by include/linux/linkage.h */
+#define __ALIGN .align 2
+#define __ALIGN_STR ".align 2"
+
+#endif
diff --git a/arch/nds32/include/asm/memory.h b/arch/nds32/include/asm/memory.h
new file mode 100644
index 0000000..60efc72
--- /dev/null
+++ b/arch/nds32/include/asm/memory.h
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __ASM_NDS32_MEMORY_H
+#define __ASM_NDS32_MEMORY_H
+
+#include <linux/compiler.h>
+#include <linux/sizes.h>
+
+#ifndef __ASSEMBLY__
+#include <asm/page.h>
+#endif
+
+#ifndef PHYS_OFFSET
+#define PHYS_OFFSET     (0x0)
+#endif
+
+#ifndef __virt_to_bus
+#define __virt_to_bus	__virt_to_phys
+#endif
+
+#ifndef __bus_to_virt
+#define __bus_to_virt	__phys_to_virt
+#endif
+
+/*
+ * TASK_SIZE - the maximum size of a user space task.
+ * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
+ */
+#define TASK_SIZE		((CONFIG_PAGE_OFFSET) - (SZ_32M))
+#define TASK_UNMAPPED_BASE	ALIGN(TASK_SIZE / 3, SZ_32M)
+#define PAGE_OFFSET		(CONFIG_PAGE_OFFSET)
+
+/*
+ * Physical vs virtual RAM address space conversion.  These are
+ * private definitions which should NOT be used outside memory.h
+ * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
+ */
+#ifndef __virt_to_phys
+#define __virt_to_phys(x)	((x) - PAGE_OFFSET + PHYS_OFFSET)
+#define __phys_to_virt(x)	((x) - PHYS_OFFSET + PAGE_OFFSET)
+#endif
+
+/*
+ * The module space lives between the addresses given by TASK_SIZE
+ * and PAGE_OFFSET - it must be within 32MB of the kernel text.
+ */
+#define MODULES_END	(PAGE_OFFSET)
+#define MODULES_VADDR	(MODULES_END - SZ_32M)
+
+#if TASK_SIZE > MODULES_VADDR
+#error Top of user space clashes with start of module space
+#endif
+
+#ifndef __ASSEMBLY__
+
+/*
+ * PFNs are used to describe any physical page; this means
+ * PFN 0 == physical address 0.
+ *
+ * This is the PFN of the first RAM page in the kernel
+ * direct-mapped view.  We assume this is the first page
+ * of RAM in the mem_map as well.
+ */
+#define PHYS_PFN_OFFSET	(PHYS_OFFSET >> PAGE_SHIFT)
+
+/*
+ * Drivers should NOT use these either.
+ */
+#define __pa(x)			__virt_to_phys((unsigned long)(x))
+#define __va(x)			((void *)__phys_to_virt((unsigned long)(x)))
+
+/*
+ * Conversion between a struct page and a physical address.
+ *
+ * Note: when converting an unknown physical address to a
+ * struct page, the resulting pointer must be validated
+ * using VALID_PAGE().  It must return an invalid struct page
+ * for any physical address not corresponding to a system
+ * RAM address.
+ *
+ *  pfn_valid(pfn)	indicates whether a PFN number is valid
+ *
+ *  virt_to_page(k)	convert a _valid_ virtual address to struct page *
+ *  virt_addr_valid(k)	indicates whether a virtual address is valid
+ */
+#ifndef CONFIG_DISCONTIGMEM
+
+#define ARCH_PFN_OFFSET		PHYS_PFN_OFFSET
+#define pfn_valid(pfn)		((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
+
+#define virt_to_page(kaddr)	(pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
+#define virt_addr_valid(kaddr)	((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
+
+#else /* CONFIG_DISCONTIGMEM */
+#error CONFIG_DISCONTIGMEM is not supported yet.
+#endif /* !CONFIG_DISCONTIGMEM */
+
+#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
+
+#endif
+
+#include <asm-generic/memory_model.h>
+
+#endif
diff --git a/arch/nds32/include/asm/mmu.h b/arch/nds32/include/asm/mmu.h
new file mode 100644
index 0000000..88b9ee8
--- /dev/null
+++ b/arch/nds32/include/asm/mmu.h
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __NDS32_MMU_H
+#define __NDS32_MMU_H
+
+typedef struct {
+	unsigned int id;
+	void *vdso;
+} mm_context_t;
+
+#endif
diff --git a/arch/nds32/include/asm/mmu_context.h b/arch/nds32/include/asm/mmu_context.h
new file mode 100644
index 0000000..fd7d13c
--- /dev/null
+++ b/arch/nds32/include/asm/mmu_context.h
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __ASM_NDS32_MMU_CONTEXT_H
+#define __ASM_NDS32_MMU_CONTEXT_H
+
+#include <linux/spinlock.h>
+#include <asm/tlbflush.h>
+#include <asm/proc-fns.h>
+#include <asm-generic/mm_hooks.h>
+
+static inline int
+init_new_context(struct task_struct *tsk, struct mm_struct *mm)
+{
+	mm->context.id = 0;
+	return 0;
+}
+
+#define destroy_context(mm)	do { } while(0)
+
+#define CID_BITS	9
+extern spinlock_t cid_lock;
+extern unsigned int cpu_last_cid;
+
+static inline void __new_context(struct mm_struct *mm)
+{
+	unsigned int cid;
+	unsigned long flags;
+
+	spin_lock_irqsave(&cid_lock, flags);
+	cid = cpu_last_cid;
+	cpu_last_cid += 1 << TLB_MISC_offCID;
+	if (cpu_last_cid == 0)
+		cpu_last_cid = 1 << TLB_MISC_offCID << CID_BITS;
+
+	if ((cid & TLB_MISC_mskCID) == 0)
+		flush_tlb_all();
+	spin_unlock_irqrestore(&cid_lock, flags);
+
+	mm->context.id = cid;
+}
+
+static inline void check_context(struct mm_struct *mm)
+{
+	if (unlikely
+	    ((mm->context.id ^ cpu_last_cid) >> TLB_MISC_offCID >> CID_BITS))
+		__new_context(mm);
+}
+
+static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
+{
+}
+
+static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
+			     struct task_struct *tsk)
+{
+	unsigned int cpu = smp_processor_id();
+
+	if (!cpumask_test_and_set_cpu(cpu, mm_cpumask(next)) || prev != next) {
+		check_context(next);
+		cpu_switch_mm(next);
+	}
+}
+
+#define deactivate_mm(tsk,mm)	do { } while (0)
+#define activate_mm(prev,next)	switch_mm(prev, next, NULL)
+
+#endif
diff --git a/arch/nds32/include/asm/module.h b/arch/nds32/include/asm/module.h
new file mode 100644
index 0000000..16cf9c7
--- /dev/null
+++ b/arch/nds32/include/asm/module.h
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef _ASM_NDS32_MODULE_H
+#define _ASM_NDS32_MODULE_H
+
+#include <asm-generic/module.h>
+
+#define MODULE_ARCH_VERMAGIC	"NDS32v3"
+
+#endif /* _ASM_NDS32_MODULE_H */
diff --git a/arch/nds32/include/asm/nds32.h b/arch/nds32/include/asm/nds32.h
new file mode 100644
index 0000000..19b1939
--- /dev/null
+++ b/arch/nds32/include/asm/nds32.h
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef _ASM_NDS32_NDS32_H_
+#define _ASM_NDS32_NDS32_H_
+
+#include <asm/bitfield.h>
+#include <asm/cachectl.h>
+
+#ifndef __ASSEMBLY__
+#include <linux/init.h>
+#include <asm/barrier.h>
+#include <nds32_intrinsic.h>
+
+#ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
+#define FP_OFFSET (-3)
+#else
+#define FP_OFFSET (-2)
+#endif
+
+extern void __init early_trap_init(void);
+static inline void GIE_ENABLE(void)
+{
+	mb();
+	__nds32__gie_en();
+}
+
+static inline void GIE_DISABLE(void)
+{
+	mb();
+	__nds32__gie_dis();
+}
+
+static inline unsigned long CACHE_SET(unsigned char cache)
+{
+
+	if (cache == ICACHE)
+		return 64 << ((__nds32__mfsr(NDS32_SR_ICM_CFG) & ICM_CFG_mskISET) >>
+			      ICM_CFG_offISET);
+	else
+		return 64 << ((__nds32__mfsr(NDS32_SR_DCM_CFG) & DCM_CFG_mskDSET) >>
+			      DCM_CFG_offDSET);
+}
+
+static inline unsigned long CACHE_WAY(unsigned char cache)
+{
+
+	if (cache == ICACHE)
+		return 1 +
+		    ((__nds32__mfsr(NDS32_SR_ICM_CFG) & ICM_CFG_mskIWAY) >> ICM_CFG_offIWAY);
+	else
+		return 1 +
+		    ((__nds32__mfsr(NDS32_SR_DCM_CFG) & DCM_CFG_mskDWAY) >> DCM_CFG_offDWAY);
+}
+
+static inline unsigned long CACHE_LINE_SIZE(unsigned char cache)
+{
+
+	if (cache == ICACHE)
+		return 8 <<
+		    (((__nds32__mfsr(NDS32_SR_ICM_CFG) & ICM_CFG_mskISZ) >> ICM_CFG_offISZ) - 1);
+	else
+		return 8 <<
+		    (((__nds32__mfsr(NDS32_SR_DCM_CFG) & DCM_CFG_mskDSZ) >> DCM_CFG_offDSZ) - 1);
+}
+
+#endif /* __ASSEMBLY__ */
+
+#define IVB_BASE		PHYS_OFFSET	/* in user space for intr/exc/trap/break table base, 64KB aligned
+						 * We defined at the start of the physical memory */
+
+/* dispatched sub-entry exception handler numbering */
+#define RD_PROT			0	/* read protrection */
+#define WRT_PROT		1	/* write protection */
+#define NOEXEC			2	/* non executable */
+#define PAGE_MODIFY		3	/* page modified */
+#define ACC_BIT			4	/* access bit */
+#define RESVED_PTE		5	/* reserved PTE attribute */
+/* reserved 6 ~ 16 */
+
+#endif /* _ASM_NDS32_NDS32_H_ */
diff --git a/arch/nds32/include/asm/page.h b/arch/nds32/include/asm/page.h
new file mode 100644
index 0000000..e27365c
--- /dev/null
+++ b/arch/nds32/include/asm/page.h
@@ -0,0 +1,67 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0
+ * Copyright (C) 2005-2017 Andes Technology Corporation
+ */
+
+#ifndef _ASMNDS32_PAGE_H
+#define _ASMNDS32_PAGE_H
+
+#ifdef CONFIG_ANDES_PAGE_SIZE_4KB
+#define PAGE_SHIFT      12
+#endif
+#ifdef CONFIG_ANDES_PAGE_SIZE_8KB
+#define PAGE_SHIFT      13
+#endif
+#include <linux/const.h>
+#define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
+#define PAGE_MASK       (~(PAGE_SIZE-1))
+
+#ifdef __KERNEL__
+
+#ifndef __ASSEMBLY__
+
+struct page;
+struct vm_area_struct;
+#ifdef CONFIG_CPU_CACHE_ALIASING
+extern void copy_user_highpage(struct page *to, struct page *from,
+			       unsigned long vaddr, struct vm_area_struct *vma);
+extern void clear_user_highpage(struct page *page, unsigned long vaddr);
+
+#define __HAVE_ARCH_COPY_USER_HIGHPAGE
+#define clear_user_highpage	clear_user_highpage
+#else
+#define clear_user_page(page, vaddr, pg)        clear_page(page)
+#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
+#endif
+
+void clear_page(void *page);
+void copy_page(void *to, void *from);
+
+typedef unsigned long pte_t;
+typedef unsigned long pmd_t;
+typedef unsigned long pgd_t;
+typedef unsigned long pgprot_t;
+
+#define pte_val(x)      (x)
+#define pmd_val(x)      (x)
+#define pgd_val(x)	(x)
+#define pgprot_val(x)   (x)
+
+#define __pte(x)        (x)
+#define __pmd(x)        (x)
+#define __pgd(x)        (x)
+#define __pgprot(x)     (x)
+
+typedef struct page *pgtable_t;
+
+#include <asm/memory.h>
+#include <asm-generic/getorder.h>
+
+#endif /* !__ASSEMBLY__ */
+
+#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
+				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
+
+#endif /* __KERNEL__ */
+
+#endif
diff --git a/arch/nds32/include/asm/pgalloc.h b/arch/nds32/include/asm/pgalloc.h
new file mode 100644
index 0000000..2744886
--- /dev/null
+++ b/arch/nds32/include/asm/pgalloc.h
@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef _ASMNDS32_PGALLOC_H
+#define _ASMNDS32_PGALLOC_H
+
+#include <asm/processor.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+#include <asm/proc-fns.h>
+
+/*
+ * Since we have only two-level page tables, these are trivial
+ */
+#define pmd_alloc_one(mm, addr)		({ BUG(); ((pmd_t *)2); })
+#define pmd_free(mm, pmd)			do { } while (0)
+#define pgd_populate(mm, pmd, pte)	BUG()
+#define pmd_pgtable(pmd) pmd_page(pmd)
+
+extern pgd_t *pgd_alloc(struct mm_struct *mm);
+extern void pgd_free(struct mm_struct *mm, pgd_t * pgd);
+
+#define check_pgt_cache()		do { } while (0)
+
+static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
+					  unsigned long addr)
+{
+	pte_t *pte;
+
+	pte =
+	    (pte_t *) __get_free_page(GFP_KERNEL | __GFP_RETRY_MAYFAIL |
+				      __GFP_ZERO);
+
+	return pte;
+}
+
+static inline pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long addr)
+{
+	pgtable_t pte;
+
+	pte = alloc_pages(GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_ZERO, 0);
+	if (pte)
+		cpu_dcache_wb_page((unsigned long)page_address(pte));
+
+	return pte;
+}
+
+/*
+ * Free one PTE table.
+ */
+static inline void pte_free_kernel(struct mm_struct *mm, pte_t * pte)
+{
+	if (pte) {
+		free_page((unsigned long)pte);
+	}
+}
+
+static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
+{
+	__free_page(pte);
+}
+
+/*
+ * Populate the pmdp entry with a pointer to the pte.  This pmd is part
+ * of the mm address space.
+ *
+ * Ensure that we always set both PMD entries.
+ */
+static inline void
+pmd_populate_kernel(struct mm_struct *mm, pmd_t * pmdp, pte_t * ptep)
+{
+	unsigned long pte_ptr = (unsigned long)ptep;
+	unsigned long pmdval;
+
+	BUG_ON(mm != &init_mm);
+
+	/*
+	 * The pmd must be loaded with the physical
+	 * address of the PTE table
+	 */
+	pmdval = __pa(pte_ptr) | _PAGE_KERNEL_TABLE;
+	set_pmd(pmdp, __pmd(pmdval));
+}
+
+static inline void
+pmd_populate(struct mm_struct *mm, pmd_t * pmdp, pgtable_t ptep)
+{
+	unsigned long pmdval;
+
+	BUG_ON(mm == &init_mm);
+
+	pmdval = page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE;
+	set_pmd(pmdp, __pmd(pmdval));
+}
+
+#endif
diff --git a/arch/nds32/include/asm/pgtable.h b/arch/nds32/include/asm/pgtable.h
new file mode 100644
index 0000000..6783937
--- /dev/null
+++ b/arch/nds32/include/asm/pgtable.h
@@ -0,0 +1,409 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef _ASMNDS32_PGTABLE_H
+#define _ASMNDS32_PGTABLE_H
+
+#define __PAGETABLE_PMD_FOLDED
+#include <asm-generic/4level-fixup.h>
+#include <asm-generic/sizes.h>
+
+#include <asm/memory.h>
+#include <asm/nds32.h>
+#ifndef __ASSEMBLY__
+#include <asm/fixmap.h>
+#include <asm/io.h>
+#include <nds32_intrinsic.h>
+#endif
+
+#ifdef CONFIG_ANDES_PAGE_SIZE_4KB
+#define PGDIR_SHIFT      22
+#define PTRS_PER_PGD     1024
+#define PMD_SHIFT        22
+#define PTRS_PER_PMD     1
+#define PTRS_PER_PTE     1024
+#endif
+
+#ifdef CONFIG_ANDES_PAGE_SIZE_8KB
+#define PGDIR_SHIFT      24
+#define PTRS_PER_PGD     256
+#define PMD_SHIFT        24
+#define PTRS_PER_PMD     1
+#define PTRS_PER_PTE     2048
+#endif
+
+#ifndef __ASSEMBLY__
+extern void __pte_error(const char *file, int line, unsigned long val);
+extern void __pmd_error(const char *file, int line, unsigned long val);
+extern void __pgd_error(const char *file, int line, unsigned long val);
+
+#define pte_ERROR(pte)		__pte_error(__FILE__, __LINE__, pte_val(pte))
+#define pmd_ERROR(pmd)		__pmd_error(__FILE__, __LINE__, pmd_val(pmd))
+#define pgd_ERROR(pgd)		__pgd_error(__FILE__, __LINE__, pgd_val(pgd))
+#endif /* !__ASSEMBLY__ */
+
+#define PMD_SIZE		(1UL << PMD_SHIFT)
+#define PMD_MASK		(~(PMD_SIZE-1))
+#define PGDIR_SIZE		(1UL << PGDIR_SHIFT)
+#define PGDIR_MASK		(~(PGDIR_SIZE-1))
+
+/*
+ * This is the lowest virtual address we can permit any user space
+ * mapping to be mapped at.  This is particularly important for
+ * non-high vector CPUs.
+ */
+#define FIRST_USER_ADDRESS	0x8000
+
+#ifdef CONFIG_HIGHMEM
+#define CONSISTENT_BASE		((PKMAP_BASE) - (SZ_2M))
+#define CONSISTENT_END		(PKMAP_BASE)
+#else
+#define CONSISTENT_BASE		(FIXADDR_START - SZ_2M)
+#define CONSISTENT_END		(FIXADDR_START)
+#endif
+#define CONSISTENT_OFFSET(x)	(((unsigned long)(x) - CONSISTENT_BASE) >> PAGE_SHIFT)
+
+#ifdef CONFIG_HIGHMEM
+#ifndef __ASSEMBLY__
+#include <asm/highmem.h>
+#endif
+#endif
+
+#define VMALLOC_RESERVE 	SZ_128M
+#define VMALLOC_END		(CONSISTENT_BASE - PAGE_SIZE)
+#define VMALLOC_START		((VMALLOC_END) - VMALLOC_RESERVE)
+#define VMALLOC_VMADDR(x)	((unsigned long)(x))
+#define MAXMEM			__pa(VMALLOC_START)
+#define MAXMEM_PFN		PFN_DOWN(MAXMEM)
+
+#define FIRST_USER_PGD_NR	0
+#define USER_PTRS_PER_PGD	((TASK_SIZE/PGDIR_SIZE) + FIRST_USER_PGD_NR)
+
+/* L2 PTE */
+#define _PAGE_V			(1UL << 0)
+
+#define _PAGE_M_XKRW            (0UL << 1)
+#define _PAGE_M_UR_KR		(1UL << 1)
+#define _PAGE_M_UR_KRW		(2UL << 1)
+#define _PAGE_M_URW_KRW		(3UL << 1)
+#define _PAGE_M_KR		(5UL << 1)
+#define _PAGE_M_KRW		(7UL << 1)
+
+#define _PAGE_D			(1UL << 4)
+#define _PAGE_E			(1UL << 5)
+#define _PAGE_A			(1UL << 6)
+#define _PAGE_G			(1UL << 7)
+
+#define _PAGE_C_DEV		(0UL << 8)
+#define _PAGE_C_DEV_WB		(1UL << 8)
+#define _PAGE_C_MEM		(2UL << 8)
+#define _PAGE_C_MEM_SHRD_WB	(4UL << 8)
+#define _PAGE_C_MEM_SHRD_WT	(5UL << 8)
+#define _PAGE_C_MEM_WB		(6UL << 8)
+#define _PAGE_C_MEM_WT		(7UL << 8)
+
+#define _PAGE_L			(1UL << 11)
+
+#define _HAVE_PAGE_L		(_PAGE_L)
+#define _PAGE_FILE		(1UL << 1)
+#define _PAGE_YOUNG		0
+#define _PAGE_M_MASK		_PAGE_M_KRW
+#define _PAGE_C_MASK		_PAGE_C_MEM_WT
+
+#ifdef CONFIG_SMP
+#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
+#define _PAGE_CACHE_SHRD	_PAGE_C_MEM_SHRD_WT
+#else
+#define _PAGE_CACHE_SHRD	_PAGE_C_MEM_SHRD_WB
+#endif
+#else
+#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
+#define _PAGE_CACHE_SHRD	_PAGE_C_MEM_WT
+#else
+#define _PAGE_CACHE_SHRD	_PAGE_C_MEM_WB
+#endif
+#endif
+
+#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
+#define _PAGE_CACHE		_PAGE_C_MEM_WT
+#else
+#define _PAGE_CACHE		_PAGE_C_MEM_WB
+#endif
+
+/*
+ * + Level 1 descriptor (PMD)
+ */
+#define PMD_TYPE_TABLE		0
+
+#ifndef __ASSEMBLY__
+
+#define _PAGE_USER_TABLE     PMD_TYPE_TABLE
+#define _PAGE_KERNEL_TABLE   PMD_TYPE_TABLE
+
+#define PAGE_EXEC	__pgprot(_PAGE_V | _PAGE_M_XKRW | _PAGE_E)
+#define PAGE_NONE	__pgprot(_PAGE_V | _PAGE_M_KRW | _PAGE_A)
+#define PAGE_READ	__pgprot(_PAGE_V | _PAGE_M_UR_KR)
+#define PAGE_RDWR	__pgprot(_PAGE_V | _PAGE_M_URW_KRW | _PAGE_D)
+#define PAGE_COPY	__pgprot(_PAGE_V | _PAGE_M_UR_KR)
+
+#define PAGE_UXKRWX_V1	__pgprot(_PAGE_V | _PAGE_M_KRW | _PAGE_D | _PAGE_E | _PAGE_G | _PAGE_CACHE_SHRD)
+#define PAGE_UXKRWX_V2	__pgprot(_PAGE_V | _PAGE_M_XKRW | _PAGE_D | _PAGE_E | _PAGE_G | _PAGE_CACHE_SHRD)
+#define PAGE_URXKRWX_V2	__pgprot(_PAGE_V | _PAGE_M_UR_KRW | _PAGE_D | _PAGE_E | _PAGE_G | _PAGE_CACHE_SHRD)
+#define PAGE_CACHE_L1	__pgprot(_HAVE_PAGE_L | _PAGE_V | _PAGE_M_KRW | _PAGE_D | _PAGE_E | _PAGE_G | _PAGE_CACHE)
+#define PAGE_MEMORY	__pgprot(_HAVE_PAGE_L | _PAGE_V | _PAGE_M_KRW | _PAGE_D | _PAGE_E | _PAGE_G | _PAGE_CACHE_SHRD)
+#define PAGE_KERNEL	__pgprot(_PAGE_V | _PAGE_M_KRW | _PAGE_D | _PAGE_E | _PAGE_G | _PAGE_CACHE_SHRD)
+#define PAGE_DEVICE    __pgprot(_PAGE_V | _PAGE_M_KRW | _PAGE_D | _PAGE_G | _PAGE_C_DEV)
+#endif /* __ASSEMBLY__ */
+
+/*         xwr */
+#define __P000  (PAGE_NONE | _PAGE_CACHE_SHRD)
+#define __P001  (PAGE_READ | _PAGE_CACHE_SHRD)
+#define __P010  (PAGE_COPY | _PAGE_CACHE_SHRD)
+#define __P011  (PAGE_COPY | _PAGE_CACHE_SHRD)
+#define __P100  (PAGE_EXEC | _PAGE_CACHE_SHRD)
+#define __P101  (PAGE_READ | _PAGE_E | _PAGE_CACHE_SHRD)
+#define __P110  (PAGE_COPY | _PAGE_E | _PAGE_CACHE_SHRD)
+#define __P111  (PAGE_COPY | _PAGE_E | _PAGE_CACHE_SHRD)
+
+#define __S000  (PAGE_NONE | _PAGE_CACHE_SHRD)
+#define __S001  (PAGE_READ | _PAGE_CACHE_SHRD)
+#define __S010  (PAGE_RDWR | _PAGE_CACHE_SHRD)
+#define __S011  (PAGE_RDWR | _PAGE_CACHE_SHRD)
+#define __S100  (PAGE_EXEC | _PAGE_CACHE_SHRD)
+#define __S101  (PAGE_READ | _PAGE_E | _PAGE_CACHE_SHRD)
+#define __S110  (PAGE_RDWR | _PAGE_E | _PAGE_CACHE_SHRD)
+#define __S111  (PAGE_RDWR | _PAGE_E | _PAGE_CACHE_SHRD)
+
+#ifndef __ASSEMBLY__
+/*
+ * ZERO_PAGE is a global shared page that is always zero: used
+ * for zero-mapped memory areas etc..
+ */
+extern struct page *empty_zero_page;
+extern void paging_init(void);
+#define ZERO_PAGE(vaddr)	(empty_zero_page)
+
+#define pte_pfn(pte)		(pte_val(pte) >> PAGE_SHIFT)
+#define pfn_pte(pfn,prot)	(__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)))
+
+#define pte_none(pte)	        !(pte_val(pte))
+#define pte_clear(mm,addr,ptep)	set_pte_at((mm),(addr),(ptep), __pte(0))
+#define pte_page(pte)		(pfn_to_page(pte_pfn(pte)))
+
+#define pte_index(address)                   (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
+#define pte_offset_kernel(dir, address)	     ((pte_t *)pmd_page_kernel(*(dir)) + pte_index(address))
+#define pte_offset_map(dir, address)	     ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
+#define pte_offset_map_nested(dir, address)  pte_offset_map(dir, address)
+#define pmd_page_kernel(pmd)	  	     ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
+
+#define pte_unmap(pte)		do { } while (0)
+#define pte_unmap_nested(pte)	do { } while (0)
+
+#define pmd_off_k(address)	pmd_offset(pgd_offset_k(address), address)
+
+#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+/*
+ * Set a level 1 translation table entry, and clean it out of
+ * any caches such that the MMUs can load it correctly.
+ */
+static inline void set_pmd(pmd_t * pmdp, pmd_t pmd)
+{
+
+	*pmdp = pmd;
+#if !defined(CONFIG_CPU_DCACHE_DISABLE) && !defined(CONFIG_CPU_DCACHE_WRITETHROUGH)
+	__asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (pmdp):"memory");
+	__nds32__msync_all();
+	__nds32__dsb();
+#endif
+}
+
+/*
+ * Set a PTE and flush it out
+ */
+static inline void set_pte(pte_t * ptep, pte_t pte)
+{
+
+	*ptep = pte;
+#if !defined(CONFIG_CPU_DCACHE_DISABLE) && !defined(CONFIG_CPU_DCACHE_WRITETHROUGH)
+	__asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (ptep):"memory");
+	__nds32__msync_all();
+	__nds32__dsb();
+#endif
+}
+
+/*
+ * The following only work if pte_present() is true.
+ * Undefined behaviour if not..
+ */
+
+/*
+ * pte_write: 	     this page is writeable for user mode
+ * pte_read:         this page is readable for user mode
+ * pte_kernel_write: this page is writeable for kernel mode
+ *
+ * We don't have pte_kernel_read because kernel always can read.
+ *
+ * */
+
+#define pte_present(pte)        (pte_val(pte) & _PAGE_V)
+#define pte_write(pte)          ((pte_val(pte) & _PAGE_M_MASK) == _PAGE_M_URW_KRW)
+#define pte_read(pte)		(((pte_val(pte) & _PAGE_M_MASK) == _PAGE_M_UR_KR) || \
+				((pte_val(pte) & _PAGE_M_MASK) == _PAGE_M_UR_KRW) || \
+				((pte_val(pte) & _PAGE_M_MASK) == _PAGE_M_URW_KRW))
+#define pte_kernel_write(pte)   (((pte_val(pte) & _PAGE_M_MASK) == _PAGE_M_URW_KRW) || \
+				((pte_val(pte) & _PAGE_M_MASK) == _PAGE_M_UR_KRW) || \
+				((pte_val(pte) & _PAGE_M_MASK) == _PAGE_M_KRW) || \
+				(((pte_val(pte) & _PAGE_M_MASK) == _PAGE_M_XKRW) && pte_exec(pte)))
+#define pte_exec(pte)		(pte_val(pte) & _PAGE_E)
+#define pte_dirty(pte)		(pte_val(pte) & _PAGE_D)
+#define pte_young(pte)		(pte_val(pte) & _PAGE_YOUNG)
+
+/*
+ * The following only works if pte_present() is not true.
+ */
+#define pte_file(pte)		(pte_val(pte) & _PAGE_FILE)
+#define pte_to_pgoff(x)		(pte_val(x) >> 2)
+#define pgoff_to_pte(x)		__pte(((x) << 2) | _PAGE_FILE)
+
+#define PTE_FILE_MAX_BITS	29
+
+#define PTE_BIT_FUNC(fn,op) \
+static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; }
+
+static inline pte_t pte_wrprotect(pte_t pte)
+{
+	pte_val(pte) = pte_val(pte) & ~_PAGE_M_MASK;
+	pte_val(pte) = pte_val(pte) | _PAGE_M_UR_KR;
+	return pte;
+}
+
+static inline pte_t pte_mkwrite(pte_t pte)
+{
+	pte_val(pte) = pte_val(pte) & ~_PAGE_M_MASK;
+	pte_val(pte) = pte_val(pte) | _PAGE_M_URW_KRW;
+	return pte;
+}
+
+PTE_BIT_FUNC(exprotect, &=~_PAGE_E);
+PTE_BIT_FUNC(mkexec, |=_PAGE_E);
+PTE_BIT_FUNC(mkclean, &=~_PAGE_D);
+PTE_BIT_FUNC(mkdirty, |=_PAGE_D);
+PTE_BIT_FUNC(mkold, &=~_PAGE_YOUNG);
+PTE_BIT_FUNC(mkyoung, |=_PAGE_YOUNG);
+static inline int pte_special(pte_t pte)
+{
+	return 0;
+}
+
+static inline pte_t pte_mkspecial(pte_t pte)
+{
+	return pte;
+}
+
+/*
+ * Mark the prot value as uncacheable and unbufferable.
+ */
+#define pgprot_noncached(prot)	   __pgprot((pgprot_val(prot)&~_PAGE_C_MASK) | _PAGE_C_DEV)
+#define pgprot_writecombine(prot)  __pgprot((pgprot_val(prot)&~_PAGE_C_MASK) | _PAGE_C_DEV_WB)
+
+#define pmd_none(pmd)         (pmd_val(pmd)&0x1)
+#define pmd_present(pmd)      (!pmd_none(pmd))
+#define	pmd_bad(pmd)	      pmd_none(pmd)
+
+#define copy_pmd(pmdpd,pmdps)	set_pmd((pmdpd), *(pmdps))
+#define pmd_clear(pmdp)		set_pmd((pmdp), __pmd(1))
+
+static inline pmd_t __mk_pmd(pte_t * ptep, unsigned long prot)
+{
+	unsigned long ptr = (unsigned long)ptep;
+	pmd_t pmd;
+
+	/*
+	 * The pmd must be loaded with the physical
+	 * address of the PTE table
+	 */
+
+	pmd_val(pmd) = __virt_to_phys(ptr) | prot;
+	return pmd;
+}
+
+#define pmd_page(pmd)        virt_to_page(__va(pmd_val(pmd)))
+
+/*
+ * Permanent address of a page. We never have highmem, so this is trivial.
+ */
+#define pages_to_mb(x)       ((x) >> (20 - PAGE_SHIFT))
+
+/*
+ * Conversion functions: convert a page and protection to a page entry,
+ * and a page entry and page directory to the page they refer to.
+ */
+#define mk_pte(page,prot)	pfn_pte(page_to_pfn(page),prot)
+
+/*
+ * The "pgd_xxx()" functions here are trivial for a folded two-level
+ * setup: the pgd is never bad, and a pmd always exists (as it's folded
+ * into the pgd entry)
+ */
+#define pgd_none(pgd)		(0)
+#define pgd_bad(pgd)		(0)
+#define pgd_present(pgd)  	(1)
+#define pgd_clear(pgdp)		do { } while (0)
+
+#define page_pte_prot(page,prot)     	mk_pte(page, prot)
+#define page_pte(page)		        mk_pte(page, __pgprot(0))
+/*
+ *     L1PTE = $mr1 + ((virt >> PMD_SHIFT) << 2);
+ *     L2PTE = (((virt >> PAGE_SHIFT) & (PTRS_PER_PTE -1 )) << 2);
+ *     PPN = (phys & 0xfffff000);
+ *
+*/
+
+/* to find an entry in a page-table-directory */
+#define pgd_index(address)      (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
+#define pgd_offset(mm, address)	((mm)->pgd + pgd_index(address))
+/* to find an entry in a kernel page-table-directory */
+#define pgd_offset_k(addr)      pgd_offset(&init_mm, addr)
+
+/* Find an entry in the second-level page table.. */
+#define pmd_offset(dir, addr)	((pmd_t *)(dir))
+
+static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
+{
+	const unsigned long mask = 0xfff;
+	pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
+	return pte;
+}
+
+extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
+
+/* Encode and decode a swap entry.
+ *
+ * We support up to 32GB of swap on 4k machines
+ */
+#define __swp_type(x)	 	     (((x).val >> 2) & 0x7f)
+#define __swp_offset(x)	   	     ((x).val >> 9)
+#define __swp_entry(type,offset)     ((swp_entry_t) { ((type) << 2) | ((offset) << 9) })
+#define __pte_to_swp_entry(pte)	     ((swp_entry_t) { pte_val(pte) })
+#define __swp_entry_to_pte(swp)	     ((pte_t) { (swp).val })
+
+/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
+#define kern_addr_valid(addr)	(1)
+
+#include <asm-generic/pgtable.h>
+
+/*
+ * We provide our own arch_get_unmapped_area to cope with VIPT caches.
+ */
+#define HAVE_ARCH_UNMAPPED_AREA
+
+/*
+ * remap a physical address `phys' of size `size' with page protection `prot'
+ * into virtual address `from'
+ */
+
+#define pgtable_cache_init()       do { } while (0)
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* _ASMNDS32_PGTABLE_H */
diff --git a/arch/nds32/include/asm/proc-fns.h b/arch/nds32/include/asm/proc-fns.h
new file mode 100644
index 0000000..bedc4f5
--- /dev/null
+++ b/arch/nds32/include/asm/proc-fns.h
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __NDS32_PROCFNS_H__
+#define __NDS32_PROCFNS_H__
+
+#ifdef __KERNEL__
+#include <asm/page.h>
+
+struct mm_struct;
+struct vm_area_struct;
+extern void cpu_proc_init(void);
+extern void cpu_proc_fin(void);
+extern void cpu_do_idle(void);
+extern void cpu_reset(unsigned long reset);
+extern void cpu_switch_mm(struct mm_struct *mm);
+
+extern void cpu_dcache_inval_all(void);
+extern void cpu_dcache_wbinval_all(void);
+extern void cpu_dcache_inval_page(unsigned long page);
+extern void cpu_dcache_wb_page(unsigned long page);
+extern void cpu_dcache_wbinval_page(unsigned long page);
+extern void cpu_dcache_inval_range(unsigned long start, unsigned long end);
+extern void cpu_dcache_wb_range(unsigned long start, unsigned long end);
+extern void cpu_dcache_wbinval_range(unsigned long start, unsigned long end);
+
+extern void cpu_icache_inval_all(void);
+extern void cpu_icache_inval_page(unsigned long page);
+extern void cpu_icache_inval_range(unsigned long start, unsigned long end);
+
+extern void cpu_cache_wbinval_page(unsigned long page, int flushi);
+extern void cpu_cache_wbinval_range(unsigned long start,
+				    unsigned long end, int flushi);
+extern void cpu_cache_wbinval_range_check(struct vm_area_struct *vma,
+					  unsigned long start,
+					  unsigned long end, bool flushi,
+					  bool wbd);
+
+extern void cpu_dma_wb_range(unsigned long start, unsigned long end);
+extern void cpu_dma_inval_range(unsigned long start, unsigned long end);
+extern void cpu_dma_wbinval_range(unsigned long start, unsigned long end);
+
+#endif /* __KERNEL__ */
+#endif /* __NDS32_PROCFNS_H__ */
diff --git a/arch/nds32/include/asm/processor.h b/arch/nds32/include/asm/processor.h
new file mode 100644
index 0000000..9c83caf
--- /dev/null
+++ b/arch/nds32/include/asm/processor.h
@@ -0,0 +1,103 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __ASM_NDS32_PROCESSOR_H
+#define __ASM_NDS32_PROCESSOR_H
+
+/*
+ * Default implementation of macro that returns current
+ * instruction pointer ("program counter").
+ */
+#define current_text_addr() ({ __label__ _l; _l: &&_l;})
+
+#ifdef __KERNEL__
+
+#include <asm/ptrace.h>
+#include <asm/types.h>
+#include <asm/sigcontext.h>
+
+#define KERNEL_STACK_SIZE	PAGE_SIZE
+#define STACK_TOP	TASK_SIZE
+#define STACK_TOP_MAX   TASK_SIZE
+
+struct cpu_context {
+	unsigned long r6;
+	unsigned long r7;
+	unsigned long r8;
+	unsigned long r9;
+	unsigned long r10;
+	unsigned long r11;
+	unsigned long r12;
+	unsigned long r13;
+	unsigned long r14;
+	unsigned long fp;
+	unsigned long pc;
+	unsigned long sp;
+};
+
+struct thread_struct {
+	struct cpu_context cpu_context;	/* cpu context */
+	/* fault info     */
+	unsigned long address;
+	unsigned long trap_no;
+	unsigned long error_code;
+};
+
+#define INIT_THREAD  {	}
+
+#ifdef __NDS32_EB__
+#define PSW_DE	PSW_mskBE
+#else
+#define PSW_DE	0x0
+#endif
+
+#ifdef CONFIG_WBNA
+#define PSW_valWBNA	PSW_mskWBNA
+#else
+#define PSW_valWBNA	0x0
+#endif
+
+#ifdef CONFIG_HWZOL
+#define	PSW_valINIT (PSW_CPL_ANY | PSW_mskAEN | PSW_valWBNA | PSW_mskDT | PSW_mskIT | PSW_DE | PSW_mskGIE)
+#else
+#define	PSW_valINIT (PSW_CPL_ANY | PSW_valWBNA | PSW_mskDT | PSW_mskIT | PSW_DE | PSW_mskGIE)
+#endif
+
+#define start_thread(regs,pc,stack)			\
+({							\
+	memzero(regs, sizeof(struct pt_regs));		\
+	forget_syscall(regs);				\
+	regs->ipsw = PSW_valINIT;			\
+	regs->ir0 = (PSW_CPL_ANY | PSW_valWBNA | PSW_mskDT | PSW_mskIT | PSW_DE | PSW_SYSTEM | PSW_INTL_1);	\
+	regs->ipc = pc;					\
+	regs->sp = stack;				\
+})
+
+/* Forward declaration, a strange C thing */
+struct task_struct;
+
+/* Free all resources held by a thread. */
+#define release_thread(thread) do { } while(0)
+
+/* Prepare to copy thread state - unlazy all lazy status */
+#define prepare_to_copy(tsk)	do { } while (0)
+
+unsigned long get_wchan(struct task_struct *p);
+
+#define cpu_relax()			barrier()
+
+#define task_pt_regs(task) \
+	((struct pt_regs *) (task_stack_page(task) + THREAD_SIZE \
+		- 8) - 1)
+
+/*
+ * Create a new kernel thread
+ */
+extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
+
+#define KSTK_EIP(tsk)	instruction_pointer(task_pt_regs(tsk))
+#define KSTK_ESP(tsk)	user_stack_pointer(task_pt_regs(tsk))
+
+#endif
+
+#endif /* __ASM_NDS32_PROCESSOR_H */
diff --git a/arch/nds32/include/asm/ptrace.h b/arch/nds32/include/asm/ptrace.h
new file mode 100644
index 0000000..c453883
--- /dev/null
+++ b/arch/nds32/include/asm/ptrace.h
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __ASM_NDS32_PTRACE_H
+#define __ASM_NDS32_PTRACE_H
+
+#include <uapi/asm/ptrace.h>
+
+/*
+ * If pt_regs.syscallno == NO_SYSCALL, then the thread is not executing
+ * a syscall -- i.e., its most recent entry into the kernel from
+ * userspace was not via syscall, or otherwise a tracer cancelled the
+ * syscall.
+ *
+ * This must have the value -1, for ABI compatibility with ptrace etc.
+ */
+#define NO_SYSCALL (-1)
+#ifndef __ASSEMBLY__
+#include <linux/types.h>
+
+struct pt_regs {
+	union {
+		struct user_pt_regs user_regs;
+		struct {
+			long uregs[26];
+			long fp;
+			long gp;
+			long lp;
+			long sp;
+			long ipc;
+#if defined(CONFIG_HWZOL)
+			long lb;
+			long le;
+			long lc;
+#else
+			long dummy[3];
+#endif
+			long syscallno;
+		};
+	};
+	long orig_r0;
+	long ir0;
+	long ipsw;
+	long pipsw;
+	long pipc;
+	long pp0;
+	long pp1;
+	long fucop_ctl;
+	long osp;
+};
+
+static inline bool in_syscall(struct pt_regs const *regs)
+{
+	return regs->syscallno != NO_SYSCALL;
+}
+
+static inline void forget_syscall(struct pt_regs *regs)
+{
+	regs->syscallno = NO_SYSCALL;
+}
+static inline unsigned long regs_return_value(struct pt_regs *regs)
+{
+	return regs->uregs[0];
+}
+extern void show_regs(struct pt_regs *);
+/* Avoid circular header include via sched.h */
+struct task_struct;
+
+#define arch_has_single_step()		(1)
+#define user_mode(regs)			(((regs)->ipsw & PSW_mskPOM) == 0)
+#define interrupts_enabled(regs)	(!!((regs)->ipsw & PSW_mskGIE))
+#define user_stack_pointer(regs)	((regs)->sp)
+#define instruction_pointer(regs)	((regs)->ipc)
+#define profile_pc(regs) 		instruction_pointer(regs)
+
+#endif /* __ASSEMBLY__ */
+#endif
diff --git a/arch/nds32/include/asm/shmparam.h b/arch/nds32/include/asm/shmparam.h
new file mode 100644
index 0000000..fd1cff6
--- /dev/null
+++ b/arch/nds32/include/asm/shmparam.h
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef _ASMNDS32_SHMPARAM_H
+#define _ASMNDS32_SHMPARAM_H
+
+/*
+ * This should be the size of the virtually indexed cache/ways,
+ * whichever is greater since the cache aliases every size/ways
+ * bytes.
+ */
+#define	SHMLBA	(4 * SZ_8K)	/* attach addr a multiple of this */
+
+/*
+ * Enforce SHMLBA in shmat
+ */
+#define __ARCH_FORCE_SHMLBA
+
+#endif /* _ASMNDS32_SHMPARAM_H */
diff --git a/arch/nds32/include/asm/string.h b/arch/nds32/include/asm/string.h
new file mode 100644
index 0000000..179272c
--- /dev/null
+++ b/arch/nds32/include/asm/string.h
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __ASM_NDS32_STRING_H
+#define __ASM_NDS32_STRING_H
+
+#define __HAVE_ARCH_MEMCPY
+extern void *memcpy(void *, const void *, __kernel_size_t);
+
+#define __HAVE_ARCH_MEMMOVE
+extern void *memmove(void *, const void *, __kernel_size_t);
+
+#define __HAVE_ARCH_MEMSET
+extern void *memset(void *, int, __kernel_size_t);
+
+extern void *memzero(void *ptr, __kernel_size_t n);
+#endif
diff --git a/arch/nds32/include/asm/swab.h b/arch/nds32/include/asm/swab.h
new file mode 100644
index 0000000..e01a755
--- /dev/null
+++ b/arch/nds32/include/asm/swab.h
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __NDS32_SWAB_H__
+#define __NDS32_SWAB_H__
+
+#include <linux/types.h>
+#include <linux/compiler.h>
+
+static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x)
+{
+	__asm__("wsbh   %0, %0\n\t"	/* word swap byte within halfword */
+		"rotri  %0, %0, #16\n"
+		:"=r"(x)
+		:"0"(x));
+	return x;
+}
+
+static __inline__ __attribute_const__ __u16 ___arch__swab16(__u16 x)
+{
+	__asm__("wsbh   %0, %0\n"	/* word swap byte within halfword */
+		:"=r"(x)
+		:"0"(x));
+	return x;
+}
+
+#define __arch_swab32(x) ___arch__swab32(x)
+#define __arch_swab16(x) ___arch__swab16(x)
+
+#if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
+#define __BYTEORDER_HAS_U64__
+#define __SWAB_64_THRU_32__
+#endif
+
+#endif /* __NDS32_SWAB_H__ */
diff --git a/arch/nds32/include/asm/syscall.h b/arch/nds32/include/asm/syscall.h
new file mode 100644
index 0000000..f7e5e86
--- /dev/null
+++ b/arch/nds32/include/asm/syscall.h
@@ -0,0 +1,188 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2008-2009 Red Hat, Inc.  All rights reserved.
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef _ASM_NDS32_SYSCALL_H
+#define _ASM_NDS32_SYSCALL_H	1
+
+#include <linux/err.h>
+struct task_struct;
+struct pt_regs;
+
+/**
+ * syscall_get_nr - find what system call a task is executing
+ * @task:	task of interest, must be blocked
+ * @regs:	task_pt_regs() of @task
+ *
+ * If @task is executing a system call or is at system call
+ * tracing about to attempt one, returns the system call number.
+ * If @task is not executing a system call, i.e. it's blocked
+ * inside the kernel for a fault or signal, returns -1.
+ *
+ * Note this returns int even on 64-bit machines.  Only 32 bits of
+ * system call number can be meaningful.  If the actual arch value
+ * is 64 bits, this truncates to 32 bits so 0xffffffff means -1.
+ *
+ * It's only valid to call this when @task is known to be blocked.
+ */
+int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
+{
+	return regs->syscallno;
+}
+
+/**
+ * syscall_rollback - roll back registers after an aborted system call
+ * @task:	task of interest, must be in system call exit tracing
+ * @regs:	task_pt_regs() of @task
+ *
+ * It's only valid to call this when @task is stopped for system
+ * call exit tracing (due to TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT),
+ * after tracehook_report_syscall_entry() returned nonzero to prevent
+ * the system call from taking place.
+ *
+ * This rolls back the register state in @regs so it's as if the
+ * system call instruction was a no-op.  The registers containing
+ * the system call number and arguments are as they were before the
+ * system call instruction.  This may not be the same as what the
+ * register state looked like at system call entry tracing.
+ */
+void syscall_rollback(struct task_struct *task, struct pt_regs *regs)
+{
+	regs->uregs[0] = regs->orig_r0;
+}
+
+/**
+ * syscall_get_error - check result of traced system call
+ * @task:	task of interest, must be blocked
+ * @regs:	task_pt_regs() of @task
+ *
+ * Returns 0 if the system call succeeded, or -ERRORCODE if it failed.
+ *
+ * It's only valid to call this when @task is stopped for tracing on exit
+ * from a system call, due to %TIF_SYSCALL_TRACE or %TIF_SYSCALL_AUDIT.
+ */
+long syscall_get_error(struct task_struct *task, struct pt_regs *regs)
+{
+	unsigned long error = regs->uregs[0];
+	return IS_ERR_VALUE(error) ? error : 0;
+}
+
+/**
+ * syscall_get_return_value - get the return value of a traced system call
+ * @task:	task of interest, must be blocked
+ * @regs:	task_pt_regs() of @task
+ *
+ * Returns the return value of the successful system call.
+ * This value is meaningless if syscall_get_error() returned nonzero.
+ *
+ * It's only valid to call this when @task is stopped for tracing on exit
+ * from a system call, due to %TIF_SYSCALL_TRACE or %TIF_SYSCALL_AUDIT.
+ */
+long syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
+{
+	return regs->uregs[0];
+}
+
+/**
+ * syscall_set_return_value - change the return value of a traced system call
+ * @task:	task of interest, must be blocked
+ * @regs:	task_pt_regs() of @task
+ * @error:	negative error code, or zero to indicate success
+ * @val:	user return value if @error is zero
+ *
+ * This changes the results of the system call that user mode will see.
+ * If @error is zero, the user sees a successful system call with a
+ * return value of @val.  If @error is nonzero, it's a negated errno
+ * code; the user sees a failed system call with this errno code.
+ *
+ * It's only valid to call this when @task is stopped for tracing on exit
+ * from a system call, due to %TIF_SYSCALL_TRACE or %TIF_SYSCALL_AUDIT.
+ */
+void syscall_set_return_value(struct task_struct *task, struct pt_regs *regs,
+			      int error, long val)
+{
+	regs->uregs[0] = (long)error ? error : val;
+}
+
+/**
+ * syscall_get_arguments - extract system call parameter values
+ * @task:	task of interest, must be blocked
+ * @regs:	task_pt_regs() of @task
+ * @i:		argument index [0,5]
+ * @n:		number of arguments; n+i must be [1,6].
+ * @args:	array filled with argument values
+ *
+ * Fetches @n arguments to the system call starting with the @i'th argument
+ * (from 0 through 5).  Argument @i is stored in @args[0], and so on.
+ * An arch inline version is probably optimal when @i and @n are constants.
+ *
+ * It's only valid to call this when @task is stopped for tracing on
+ * entry to a system call, due to %TIF_SYSCALL_TRACE or %TIF_SYSCALL_AUDIT.
+ * It's invalid to call this with @i + @n > 6; we only support system calls
+ * taking up to 6 arguments.
+ */
+#define SYSCALL_MAX_ARGS 6
+void syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
+			   unsigned int i, unsigned int n, unsigned long *args)
+{
+	if (n == 0)
+		return;
+	if (i + n > SYSCALL_MAX_ARGS) {
+		unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i;
+		unsigned int n_bad = n + i - SYSCALL_MAX_ARGS;
+		pr_warning("%s called with max args %d, handling only %d\n",
+			   __func__, i + n, SYSCALL_MAX_ARGS);
+		memset(args_bad, 0, n_bad * sizeof(args[0]));
+		memset(args_bad, 0, n_bad * sizeof(args[0]));
+	}
+
+	if (i == 0) {
+		args[0] = regs->orig_r0;
+		args++;
+		i++;
+		n--;
+	}
+
+	memcpy(args, &regs->uregs[0] + i, n * sizeof(args[0]));
+}
+
+/**
+ * syscall_set_arguments - change system call parameter value
+ * @task:	task of interest, must be in system call entry tracing
+ * @regs:	task_pt_regs() of @task
+ * @i:		argument index [0,5]
+ * @n:		number of arguments; n+i must be [1,6].
+ * @args:	array of argument values to store
+ *
+ * Changes @n arguments to the system call starting with the @i'th argument.
+ * Argument @i gets value @args[0], and so on.
+ * An arch inline version is probably optimal when @i and @n are constants.
+ *
+ * It's only valid to call this when @task is stopped for tracing on
+ * entry to a system call, due to %TIF_SYSCALL_TRACE or %TIF_SYSCALL_AUDIT.
+ * It's invalid to call this with @i + @n > 6; we only support system calls
+ * taking up to 6 arguments.
+ */
+void syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
+			   unsigned int i, unsigned int n,
+			   const unsigned long *args)
+{
+	if (n == 0)
+		return;
+
+	if (i + n > SYSCALL_MAX_ARGS) {
+		pr_warn("%s called with max args %d, handling only %d\n",
+			__func__, i + n, SYSCALL_MAX_ARGS);
+		n = SYSCALL_MAX_ARGS - i;
+	}
+
+	if (i == 0) {
+		regs->orig_r0 = args[0];
+		args++;
+		i++;
+		n--;
+	}
+
+	memcpy(&regs->uregs[0] + i, args, n * sizeof(args[0]));
+}
+#endif /* _ASM_NDS32_SYSCALL_H */
diff --git a/arch/nds32/include/asm/syscalls.h b/arch/nds32/include/asm/syscalls.h
new file mode 100644
index 0000000..78778ec
--- /dev/null
+++ b/arch/nds32/include/asm/syscalls.h
@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __ASM_NDS32_SYSCALLS_H
+#define __ASM_NDS32_SYSCALLS_H
+
+asmlinkage long sys_cacheflush(unsigned long addr, unsigned long len, unsigned int op);
+asmlinkage long sys_fadvise64_64_wrapper(int fd, int advice, loff_t offset, loff_t len);
+asmlinkage long sys_rt_sigreturn_wrapper(void);
+
+#include <asm-generic/syscalls.h>
+
+#endif /* __ASM_NDS32_SYSCALLS_H */
diff --git a/arch/nds32/include/asm/thread_info.h b/arch/nds32/include/asm/thread_info.h
new file mode 100644
index 0000000..bff741f
--- /dev/null
+++ b/arch/nds32/include/asm/thread_info.h
@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __ASM_NDS32_THREAD_INFO_H
+#define __ASM_NDS32_THREAD_INFO_H
+
+#ifdef __KERNEL__
+
+#define THREAD_SIZE_ORDER 	(1)
+#define THREAD_SIZE		(PAGE_SIZE << THREAD_SIZE_ORDER)
+
+#ifndef __ASSEMBLY__
+
+struct task_struct;
+
+#include <asm/ptrace.h>
+#include <asm/types.h>
+
+typedef unsigned long mm_segment_t;
+
+/*
+ * low level task data that entry.S needs immediate access to.
+ * __switch_to() assumes cpu_context follows immediately after cpu_domain.
+ */
+struct thread_info {
+	unsigned long flags;	/* low level flags */
+	__s32 preempt_count;	/* 0 => preemptable, <0 => bug */
+	mm_segment_t addr_limit;	/* address limit */
+};
+#define INIT_THREAD_INFO(tsk)						\
+{									\
+	.preempt_count	= INIT_PREEMPT_COUNT,				\
+	.addr_limit	= KERNEL_DS,					\
+}
+#define thread_saved_pc(tsk) ((unsigned long)(tsk->thread.cpu_context.pc))
+#define thread_saved_fp(tsk) ((unsigned long)(tsk->thread.cpu_context.fp))
+#endif
+
+/*
+ * thread information flags:
+ *  TIF_SYSCALL_TRACE	- syscall trace active
+ *  TIF_SIGPENDING	- signal pending
+ *  TIF_NEED_RESCHED	- rescheduling necessary
+ *  TIF_NOTIFY_RESUME	- callback before returning to user
+ *  TIF_USEDFPU		- FPU was used by this task this quantum (SMP)
+ *  TIF_POLLING_NRFLAG	- true if poll_idle() is polling TIF_NEED_RESCHED
+ */
+#define TIF_SIGPENDING		1
+#define TIF_NEED_RESCHED	2
+#define TIF_SINGLESTEP		3
+#define TIF_NOTIFY_RESUME	4	/* callback before returning to user */
+#define TIF_SYSCALL_TRACE	8
+#define TIF_USEDFPU             16
+#define TIF_POLLING_NRFLAG	17
+#define TIF_MEMDIE		18
+#define TIF_FREEZE		19
+#define TIF_RESTORE_SIGMASK	20
+
+#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
+#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
+#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
+#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
+#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
+#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
+#define _TIF_FREEZE		(1 << TIF_FREEZE)
+#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
+
+/*
+ * Change these and you break ASM code in entry-common.S
+ */
+#define _TIF_WORK_MASK		0x000000ff
+#define _TIF_WORK_SYSCALL_ENTRY (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP)
+#define _TIF_WORK_SYSCALL_LEAVE (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP)
+
+#endif /* __KERNEL__ */
+#endif /* __ASM_NDS32_THREAD_INFO_H */
diff --git a/arch/nds32/include/asm/tlb.h b/arch/nds32/include/asm/tlb.h
new file mode 100644
index 0000000..b35ae5e
--- /dev/null
+++ b/arch/nds32/include/asm/tlb.h
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __ASMNDS32_TLB_H
+#define __ASMNDS32_TLB_H
+
+#define tlb_start_vma(tlb,vma)						\
+	do {								\
+		if (!tlb->fullmm)					\
+			flush_cache_range(vma, vma->vm_start, vma->vm_end); \
+	} while (0)
+
+#define tlb_end_vma(tlb,vma)				\
+	do { 						\
+		if(!tlb->fullmm)			\
+			flush_tlb_range(vma, vma->vm_start, vma->vm_end); \
+	} while (0)
+
+#define __tlb_remove_tlb_entry(tlb, pte, addr) do { } while (0)
+
+#define tlb_flush(tlb)	flush_tlb_mm((tlb)->mm)
+
+#include <asm-generic/tlb.h>
+
+#define __pte_free_tlb(tlb, pte, addr)	pte_free((tlb)->mm, pte)
+#define __pmd_free_tlb(tlb, pmd, addr)	pmd_free((tln)->mm, pmd)
+
+#endif
diff --git a/arch/nds32/include/asm/tlbflush.h b/arch/nds32/include/asm/tlbflush.h
new file mode 100644
index 0000000..9b411f4
--- /dev/null
+++ b/arch/nds32/include/asm/tlbflush.h
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef _ASMNDS32_TLBFLUSH_H
+#define _ASMNDS32_TLBFLUSH_H
+
+#include <linux/spinlock.h>
+#include <linux/mm.h>
+#include <nds32_intrinsic.h>
+
+static inline void local_flush_tlb_all(void)
+{
+	__nds32__tlbop_flua();
+	__nds32__isb();
+}
+
+static inline void local_flush_tlb_mm(struct mm_struct *mm)
+{
+	__nds32__tlbop_flua();
+	__nds32__isb();
+}
+
+static inline void local_flush_tlb_kernel_range(unsigned long start,
+						unsigned long end)
+{
+	while (start < end) {
+		__nds32__tlbop_inv(start);
+		__nds32__isb();
+		start += PAGE_SIZE;
+	}
+}
+
+void local_flush_tlb_range(struct vm_area_struct *vma,
+			   unsigned long start, unsigned long end);
+void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long addr);
+
+#define flush_tlb_all		local_flush_tlb_all
+#define flush_tlb_mm		local_flush_tlb_mm
+#define flush_tlb_range		local_flush_tlb_range
+#define flush_tlb_page		local_flush_tlb_page
+#define flush_tlb_kernel_range	local_flush_tlb_kernel_range
+
+void update_mmu_cache(struct vm_area_struct *vma,
+		      unsigned long address, pte_t * pte);
+void tlb_migrate_finish(struct mm_struct *mm);
+
+#endif
diff --git a/arch/nds32/include/asm/uaccess.h b/arch/nds32/include/asm/uaccess.h
new file mode 100644
index 0000000..18a009f
--- /dev/null
+++ b/arch/nds32/include/asm/uaccess.h
@@ -0,0 +1,283 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef _ASMANDES_UACCESS_H
+#define _ASMANDES_UACCESS_H
+
+/*
+ * User space memory access functions
+ */
+#include <linux/sched.h>
+#include <asm/errno.h>
+#include <asm/memory.h>
+#include <asm/types.h>
+#include <linux/mm.h>
+
+#define VERIFY_READ	0
+#define VERIFY_WRITE	1
+
+#define __asmeq(x, y)  ".ifnc " x "," y " ; .err ; .endif\n\t"
+
+/*
+ * The exception table consists of pairs of addresses: the first is the
+ * address of an instruction that is allowed to fault, and the second is
+ * the address at which the program should continue.  No registers are
+ * modified, so it is entirely up to the continuation code to figure out
+ * what to do.
+ *
+ * All the routines below use bits of fixup code that are out of line
+ * with the main instruction path.  This means when everything is well,
+ * we don't even have to jump over them.  Further, they do not intrude
+ * on our cache or tlb entries.
+ */
+
+struct exception_table_entry {
+	unsigned long insn, fixup;
+};
+
+extern int fixup_exception(struct pt_regs *regs);
+
+#define KERNEL_DS 	((mm_segment_t) { ~0UL })
+#define USER_DS     	((mm_segment_t) {TASK_SIZE - 1})
+
+#define get_ds()	(KERNEL_DS)
+#define get_fs()	(current_thread_info()->addr_limit)
+#define user_addr_max	get_fs
+
+static inline void set_fs(mm_segment_t fs)
+{
+	current_thread_info()->addr_limit = fs;
+}
+
+#define segment_eq(a, b)    ((a) == (b))
+
+#define __range_ok(addr, size) (size <= get_fs() && addr <= (get_fs() -size))
+
+#define access_ok(type, addr, size)                 \
+	__range_ok((unsigned long)addr, (unsigned long)size)
+/*
+ * Single-value transfer routines.  They automatically use the right
+ * size if we just have the right pointer type.  Note that the functions
+ * which read from user space (*get_*) need to take care not to leak
+ * kernel data even if the calling code is buggy and fails to check
+ * the return value.  This means zeroing out the destination variable
+ * or buffer on error.  Normally this is done out of line by the
+ * fixup code, but there are a few places where it intrudes on the
+ * main code path.  When we only write to user space, there is no
+ * problem.
+ *
+ * The "__xxx" versions of the user access functions do not verify the
+ * address space - it must have been done previously with a separate
+ * "access_ok()" call.
+ *
+ * The "xxx_error" versions set the third argument to EFAULT if an
+ * error occurs, and leave it unchanged on success.  Note that these
+ * versions are void (ie, don't return a value as such).
+ */
+
+#define get_user(x,p)							\
+({									\
+	long __e = -EFAULT;						\
+	if(likely(access_ok(VERIFY_READ,  p, sizeof(*p)))) {		\
+		__e = __get_user(x,p);					\
+	} else								\
+		x = 0;							\
+	__e;								\
+})
+#define __get_user(x,ptr)						\
+({									\
+	long __gu_err = 0;						\
+	__get_user_err((x),(ptr),__gu_err);				\
+	__gu_err;							\
+})
+
+#define __get_user_error(x,ptr,err)					\
+({									\
+	__get_user_err((x),(ptr),err);					\
+	(void) 0;							\
+})
+
+#define __get_user_err(x,ptr,err)					\
+do {									\
+	unsigned long __gu_addr = (unsigned long)(ptr);			\
+	unsigned long __gu_val;						\
+	__chk_user_ptr(ptr);						\
+	switch (sizeof(*(ptr))) {					\
+	case 1:								\
+		__get_user_asm("lbi",__gu_val,__gu_addr,err);		\
+		break;							\
+	case 2:								\
+		__get_user_asm("lhi",__gu_val,__gu_addr,err);		\
+		break;							\
+	case 4:								\
+		__get_user_asm("lwi",__gu_val,__gu_addr,err);		\
+		break;							\
+	case 8:								\
+		__get_user_asm_dword(__gu_val,__gu_addr,err);		\
+		break;							\
+	default:							\
+		BUILD_BUG(); 						\
+		break;							\
+	}								\
+	(x) = (__typeof__(*(ptr)))__gu_val;				\
+} while (0)
+
+#define __get_user_asm(inst,x,addr,err)					\
+	asm volatile(							\
+	"1:	"inst"	%1,[%2]\n"					\
+	"2:\n"								\
+	"	.section .fixup,\"ax\"\n"				\
+	"	.align	2\n"						\
+	"3:	move %0, %3\n"						\
+	"	move %1, #0\n"						\
+	"	b	2b\n"						\
+	"	.previous\n"						\
+	"	.section __ex_table,\"a\"\n"				\
+	"	.align	3\n"						\
+	"	.long	1b, 3b\n"					\
+	"	.previous"						\
+	: "+r" (err), "=&r" (x)						\
+	: "r" (addr), "i" (-EFAULT)					\
+	: "cc")
+
+#ifdef __NDS32_EB__
+#define __gu_reg_oper0 "%H1"
+#define __gu_reg_oper1 "%L1"
+#else
+#define __gu_reg_oper0 "%L1"
+#define __gu_reg_oper1 "%H1"
+#endif
+
+#define __get_user_asm_dword(x, addr, err) 				\
+	asm volatile(			    				\
+	"\n1:\tlwi " __gu_reg_oper0 ",[%2]\n"				\
+	"\n2:\tlwi " __gu_reg_oper1 ",[%2+4]\n"				\
+	"3:\n"								\
+	"	.section .fixup,\"ax\"\n"				\
+	"	.align	2\n"						\
+	"4:	move	%0, %3\n"					\
+	"	b	3b\n"						\
+	"	.previous\n"						\
+	"	.section __ex_table,\"a\"\n"				\
+	"	.align	3\n"						\
+	"	.long	1b, 4b\n"					\
+	"	.long	2b, 4b\n"					\
+	"	.previous"						\
+	: "+r"(err), "=&r"(x)                				\
+	: "r"(addr), "i"(-EFAULT) 					\
+	: "cc")
+#define put_user(x,p)							\
+({									\
+	long __e = -EFAULT;						\
+	if(likely(access_ok(VERIFY_WRITE,  p, sizeof(*p)))) {		\
+		__e = __put_user(x,p);					\
+	}								\
+	__e;								\
+})
+#define __put_user(x,ptr)						\
+({									\
+	long __pu_err = 0;						\
+	__put_user_err((x),(ptr),__pu_err);				\
+	__pu_err;							\
+})
+
+#define __put_user_error(x,ptr,err)					\
+({									\
+	__put_user_err((x),(ptr),err);					\
+	(void) 0;							\
+})
+
+#define __put_user_err(x,ptr,err)					\
+do {									\
+	unsigned long __pu_addr = (unsigned long)(ptr);			\
+	__typeof__(*(ptr)) __pu_val = (x);				\
+	__chk_user_ptr(ptr);						\
+	switch (sizeof(*(ptr))) {					\
+	case 1:								\
+		__put_user_asm("sbi",__pu_val,__pu_addr,err);		\
+		break;							\
+	case 2: 							\
+		__put_user_asm("shi",__pu_val,__pu_addr,err);		\
+		break;							\
+	case 4: 							\
+		__put_user_asm("swi",__pu_val,__pu_addr,err);		\
+		break;							\
+	case 8:								\
+		__put_user_asm_dword(__pu_val,__pu_addr,err);		\
+		break;							\
+	default:							\
+		BUILD_BUG(); 						\
+		break;							\
+	}								\
+} while (0)
+
+#define __put_user_asm(inst,x,addr,err)					\
+	asm volatile(							\
+	"1:	"inst"	%1,[%2]\n"					\
+	"2:\n"								\
+	"	.section .fixup,\"ax\"\n"				\
+	"	.align	2\n"						\
+	"3:	move	%0, %3\n"					\
+	"	b	2b\n"						\
+	"	.previous\n"						\
+	"	.section __ex_table,\"a\"\n"				\
+	"	.align	3\n"						\
+	"	.long	1b, 3b\n"					\
+	"	.previous"						\
+	: "+r" (err)							\
+	: "r" (x), "r" (addr), "i" (-EFAULT)				\
+	: "cc")
+
+#ifdef __NDS32_EB__
+#define __pu_reg_oper0 "%H2"
+#define __pu_reg_oper1 "%L2"
+#else
+#define __pu_reg_oper0 "%L2"
+#define __pu_reg_oper1 "%H2"
+#endif
+
+#define __put_user_asm_dword(x, addr, err) 				\
+	asm volatile(			    				\
+	"\n1:\tswi " __pu_reg_oper0 ",[%1]\n"				\
+	"\n2:\tswi " __pu_reg_oper1 ",[%1+4]\n"				\
+	"3:\n"								\
+	"	.section .fixup,\"ax\"\n"				\
+	"	.align	2\n"						\
+	"4:	move	%0, %3\n"					\
+	"	b	3b\n"						\
+	"	.previous\n"						\
+	"	.section __ex_table,\"a\"\n"				\
+	"	.align	3\n"						\
+	"	.long	1b, 4b\n"					\
+	"	.long	2b, 4b\n"					\
+	"	.previous"						\
+	: "+r"(err)                					\
+	: "r"(addr), "r"(x), "i"(-EFAULT) 				\
+	: "cc")
+extern unsigned long __arch_clear_user(void __user * addr, unsigned long n);
+extern long strncpy_from_user(char *dest, const char __user * src, long count);
+extern __must_check long strlen_user(const char __user * str);
+extern __must_check long strnlen_user(const char __user * str, long n);
+extern unsigned long __arch_copy_from_user(void *to, const void __user * from,
+                                           unsigned long n);
+extern unsigned long __arch_copy_to_user(void __user * to, const void *from,
+                                         unsigned long n);
+
+#define raw_copy_from_user __arch_copy_from_user
+#define raw_copy_to_user __arch_copy_to_user
+
+#define INLINE_COPY_FROM_USER
+#define INLINE_COPY_TO_USER
+static inline unsigned long clear_user(void __user * to, unsigned long n)
+{
+	if (access_ok(VERIFY_WRITE, to, n))
+		n = __arch_clear_user(to, n);
+	return n;
+}
+
+static inline unsigned long __clear_user(void __user * to, unsigned long n)
+{
+	return __arch_clear_user(to, n);
+}
+
+#endif /* _ASMNDS32_UACCESS_H */
diff --git a/arch/nds32/include/asm/unistd.h b/arch/nds32/include/asm/unistd.h
new file mode 100644
index 0000000..b586a28
--- /dev/null
+++ b/arch/nds32/include/asm/unistd.h
@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#define __ARCH_WANT_SYS_CLONE
+
+#include <uapi/asm/unistd.h>
diff --git a/arch/nds32/include/asm/vdso.h b/arch/nds32/include/asm/vdso.h
new file mode 100644
index 0000000..af2c6af
--- /dev/null
+++ b/arch/nds32/include/asm/vdso.h
@@ -0,0 +1,24 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0
+ * Copyright (C) 2005-2017 Andes Technology Corporation
+ */
+
+#ifndef __ASM_VDSO_H
+#define __ASM_VDSO_H
+
+#ifdef __KERNEL__
+
+#ifndef __ASSEMBLY__
+
+#include <generated/vdso-offsets.h>
+
+#define VDSO_SYMBOL(base, name)						   \
+({									   \
+	(unsigned long)(vdso_offset_##name + (unsigned long)(base)); \
+})
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* __KERNEL__ */
+
+#endif /* __ASM_VDSO_H */
diff --git a/arch/nds32/include/asm/vdso_datapage.h b/arch/nds32/include/asm/vdso_datapage.h
new file mode 100644
index 0000000..79db5a1
--- /dev/null
+++ b/arch/nds32/include/asm/vdso_datapage.h
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2012 ARM Limited
+// Copyright (C) 2005-2017 Andes Technology Corporation
+#ifndef __ASM_VDSO_DATAPAGE_H
+#define __ASM_VDSO_DATAPAGE_H
+
+#ifdef __KERNEL__
+
+#ifndef __ASSEMBLY__
+
+struct vdso_data {
+	bool cycle_count_down;	/* timer cyclye counter is decrease with time */
+	u32 cycle_count_offset;	/* offset of timer cycle counter register */
+	u32 seq_count;		/* sequence count - odd during updates */
+	u32 xtime_coarse_sec;	/* coarse time */
+	u32 xtime_coarse_nsec;
+
+	u32 wtm_clock_sec;	/* wall to monotonic offset */
+	u32 wtm_clock_nsec;
+	u32 xtime_clock_sec;	/* CLOCK_REALTIME - seconds */
+	u32 cs_mult;		/* clocksource multiplier */
+	u32 cs_shift;		/* Cycle to nanosecond divisor (power of two) */
+
+	u64 cs_cycle_last;	/* last cycle value */
+	u64 cs_mask;		/* clocksource mask */
+
+	u64 xtime_clock_nsec;	/* CLOCK_REALTIME sub-ns base */
+	u32 tz_minuteswest;	/* timezone info for gettimeofday(2) */
+	u32 tz_dsttime;
+};
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* __KERNEL__ */
+
+#endif /* __ASM_VDSO_DATAPAGE_H */
diff --git a/arch/nds32/include/asm/vdso_timer_info.h b/arch/nds32/include/asm/vdso_timer_info.h
new file mode 100644
index 0000000..50ba117
--- /dev/null
+++ b/arch/nds32/include/asm/vdso_timer_info.h
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+extern struct timer_info_t timer_info;
+#define EMPTY_VALUE ~(0UL)
+#define EMPTY_TIMER_MAPPING EMPTY_VALUE
+#define EMPTY_REG_OFFSET EMPTY_VALUE
+
+struct timer_info_t
+{
+	bool cycle_count_down;
+	unsigned long mapping_base;
+	unsigned long cycle_count_reg_offset;
+};
diff --git a/arch/nds32/include/uapi/asm/Kbuild b/arch/nds32/include/uapi/asm/Kbuild
new file mode 100644
index 0000000..40be972
--- /dev/null
+++ b/arch/nds32/include/uapi/asm/Kbuild
@@ -0,0 +1,29 @@
+# UAPI Header export list
+include include/uapi/asm-generic/Kbuild.asm
+
+generic-y += bpf_perf_event.h
+generic-y += errno.h
+generic-y += ioctl.h
+generic-y += ioctls.h
+generic-y += ipcbuf.h
+generic-y += shmbuf.h
+generic-y += bitsperlong.h
+generic-y += fcntl.h
+generic-y += stat.h
+generic-y += mman.h
+generic-y += msgbuf.h
+generic-y += poll.h
+generic-y += posix_types.h
+generic-y += resource.h
+generic-y += sembuf.h
+generic-y += setup.h
+generic-y += siginfo.h
+generic-y += signal.h
+generic-y += socket.h
+generic-y += sockios.h
+generic-y += swab.h
+generic-y += statfs.h
+generic-y += termbits.h
+generic-y += termios.h
+generic-y += types.h
+generic-y += ucontext.h
diff --git a/arch/nds32/include/uapi/asm/auxvec.h b/arch/nds32/include/uapi/asm/auxvec.h
new file mode 100644
index 0000000..56043ce
--- /dev/null
+++ b/arch/nds32/include/uapi/asm/auxvec.h
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __ASM_AUXVEC_H
+#define __ASM_AUXVEC_H
+
+/* VDSO location */
+#define AT_SYSINFO_EHDR	33
+
+#define AT_VECTOR_SIZE_ARCH 1
+
+#endif
diff --git a/arch/nds32/include/uapi/asm/byteorder.h b/arch/nds32/include/uapi/asm/byteorder.h
new file mode 100644
index 0000000..a23f6f3a
--- /dev/null
+++ b/arch/nds32/include/uapi/asm/byteorder.h
@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __NDS32_BYTEORDER_H__
+#define __NDS32_BYTEORDER_H__
+
+#ifdef __NDS32_EB__
+#include <linux/byteorder/big_endian.h>
+#else
+#include <linux/byteorder/little_endian.h>
+#endif
+
+#endif /* __NDS32_BYTEORDER_H__ */
diff --git a/arch/nds32/include/uapi/asm/cachectl.h b/arch/nds32/include/uapi/asm/cachectl.h
new file mode 100644
index 0000000..4cdca9b
--- /dev/null
+++ b/arch/nds32/include/uapi/asm/cachectl.h
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 1994, 1995, 1996 by Ralf Baechle
+// Copyright (C) 2005-2017 Andes Technology Corporation
+#ifndef	_ASM_CACHECTL
+#define	_ASM_CACHECTL
+
+/*
+ * Options for cacheflush system call
+ */
+#define	ICACHE	0		/* flush instruction cache        */
+#define	DCACHE	1		/* writeback and flush data cache */
+#define	BCACHE	2		/* flush instruction cache + writeback and flush data cache */
+
+#endif /* _ASM_CACHECTL */
diff --git a/arch/nds32/include/uapi/asm/param.h b/arch/nds32/include/uapi/asm/param.h
new file mode 100644
index 0000000..e3fb723
--- /dev/null
+++ b/arch/nds32/include/uapi/asm/param.h
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __ASM_NDS32_PARAM_H
+#define __ASM_NDS32_PARAM_H
+
+#define EXEC_PAGESIZE	8192
+
+#include <asm-generic/param.h>
+
+#endif /* __ASM_NDS32_PARAM_H */
diff --git a/arch/nds32/include/uapi/asm/ptrace.h b/arch/nds32/include/uapi/asm/ptrace.h
new file mode 100644
index 0000000..358c99e
--- /dev/null
+++ b/arch/nds32/include/uapi/asm/ptrace.h
@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef __UAPI_ASM_NDS32_PTRACE_H
+#define __UAPI_ASM_NDS32_PTRACE_H
+
+#ifndef __ASSEMBLY__
+
+/*
+ * User structures for general purpose register.
+ */
+struct user_pt_regs {
+	long uregs[26];
+	long fp;
+	long gp;
+	long lp;
+	long sp;
+	long ipc;
+	long lb;
+	long le;
+	long lc;
+	long syscallno;
+};
+#endif
+#endif
diff --git a/arch/nds32/include/uapi/asm/sigcontext.h b/arch/nds32/include/uapi/asm/sigcontext.h
new file mode 100644
index 0000000..00567b2
--- /dev/null
+++ b/arch/nds32/include/uapi/asm/sigcontext.h
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#ifndef _ASMNDS32_SIGCONTEXT_H
+#define _ASMNDS32_SIGCONTEXT_H
+
+/*
+ * Signal context structure - contains all info to do with the state
+ * before the signal handler was invoked.  Note: only add new entries
+ * to the end of the structure.
+ */
+
+struct zol_struct {
+	unsigned long nds32_lc;	/* $LC */
+	unsigned long nds32_le;	/* $LE */
+	unsigned long nds32_lb;	/* $LB */
+};
+
+struct sigcontext {
+	unsigned long trap_no;
+	unsigned long error_code;
+	unsigned long oldmask;
+	unsigned long nds32_r0;
+	unsigned long nds32_r1;
+	unsigned long nds32_r2;
+	unsigned long nds32_r3;
+	unsigned long nds32_r4;
+	unsigned long nds32_r5;
+	unsigned long nds32_r6;
+	unsigned long nds32_r7;
+	unsigned long nds32_r8;
+	unsigned long nds32_r9;
+	unsigned long nds32_r10;
+	unsigned long nds32_r11;
+	unsigned long nds32_r12;
+	unsigned long nds32_r13;
+	unsigned long nds32_r14;
+	unsigned long nds32_r15;
+	unsigned long nds32_r16;
+	unsigned long nds32_r17;
+	unsigned long nds32_r18;
+	unsigned long nds32_r19;
+	unsigned long nds32_r20;
+	unsigned long nds32_r21;
+	unsigned long nds32_r22;
+	unsigned long nds32_r23;
+	unsigned long nds32_r24;
+	unsigned long nds32_r25;
+	unsigned long nds32_fp;	/* $r28 */
+	unsigned long nds32_gp;	/* $r29 */
+	unsigned long nds32_lp;	/* $r30 */
+	unsigned long nds32_sp;	/* $r31 */
+	unsigned long nds32_ipc;
+	unsigned long fault_address;
+	unsigned long used_math_flag;
+	/* FPU Registers */
+	struct zol_struct zol;
+};
+
+#endif
diff --git a/arch/nds32/include/uapi/asm/unistd.h b/arch/nds32/include/uapi/asm/unistd.h
new file mode 100644
index 0000000..6e95901
--- /dev/null
+++ b/arch/nds32/include/uapi/asm/unistd.h
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#define __ARCH_WANT_SYNC_FILE_RANGE2
+
+/* Use the standard ABI for syscalls */
+#include <asm-generic/unistd.h>
+
+/* Additional NDS32 specific syscalls. */
+#define __NR_cacheflush		(__NR_arch_specific_syscall)
+__SYSCALL(__NR_cacheflush, sys_cacheflush)
diff --git a/arch/nds32/kernel/Makefile b/arch/nds32/kernel/Makefile
new file mode 100644
index 0000000..4279274
--- /dev/null
+++ b/arch/nds32/kernel/Makefile
@@ -0,0 +1,23 @@
+#
+# Makefile for the linux kernel.
+#
+
+CPPFLAGS_vmlinux.lds	:= -DTEXTADDR=$(TEXTADDR)
+AFLAGS_head.o		:= -DTEXTADDR=$(TEXTADDR)
+
+# Object file lists.
+
+obj-y			:= ex-entry.o ex-exit.o ex-scall.o irq.o \
+			process.o ptrace.o setup.o signal.o \
+			sys_nds32.o time.o traps.o cacheinfo.o \
+			dma.o syscall_table.o vdso.o
+
+obj-$(CONFIG_MODULES)		+= nds32_ksyms.o module.o
+obj-$(CONFIG_STACKTRACE)	+= stacktrace.o
+obj-$(CONFIG_OF)		+= devtree.o
+obj-$(CONFIG_CACHE_L2)		+= atl2c.o
+
+extra-y := head.o vmlinux.lds
+
+
+obj-y				+= vdso/
diff --git a/arch/nds32/kernel/asm-offsets.c b/arch/nds32/kernel/asm-offsets.c
new file mode 100644
index 0000000..3541d59
--- /dev/null
+++ b/arch/nds32/kernel/asm-offsets.c
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/sched.h>
+#include <linux/sched/task_stack.h>
+#include <linux/kbuild.h>
+#include <asm/thread_info.h>
+#include <asm/ptrace.h>
+
+int main(void)
+{
+	DEFINE(TSK_TI_FLAGS, offsetof(struct task_struct, thread_info.flags));
+	DEFINE(TSK_TI_PREEMPT,
+	       offsetof(struct task_struct, thread_info.preempt_count));
+	DEFINE(THREAD_CPU_CONTEXT,
+	       offsetof(struct task_struct, thread.cpu_context));
+	DEFINE(OSP_OFFSET, offsetof(struct pt_regs, osp));
+	DEFINE(SP_OFFSET, offsetof(struct pt_regs, sp));
+	DEFINE(FUCOP_CTL_OFFSET, offsetof(struct pt_regs, fucop_ctl));
+	DEFINE(IPSW_OFFSET, offsetof(struct pt_regs, ipsw));
+	DEFINE(SYSCALLNO_OFFSET, offsetof(struct pt_regs, syscallno));
+	DEFINE(IPC_OFFSET, offsetof(struct pt_regs, ipc));
+	DEFINE(R0_OFFSET, offsetof(struct pt_regs, uregs[0]));
+	DEFINE(R15_OFFSET, offsetof(struct pt_regs, uregs[15]));
+	DEFINE(CLOCK_REALTIME_RES, MONOTONIC_RES_NSEC);
+	DEFINE(CLOCK_COARSE_RES, LOW_RES_NSEC);
+	return 0;
+}
diff --git a/arch/nds32/kernel/atl2c.c b/arch/nds32/kernel/atl2c.c
new file mode 100644
index 0000000..0c6d031
--- /dev/null
+++ b/arch/nds32/kernel/atl2c.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/compiler.h>
+#include <linux/of_address.h>
+#include <linux/of_fdt.h>
+#include <linux/of_platform.h>
+#include <asm/l2_cache.h>
+
+void __iomem *atl2c_base;
+static const struct of_device_id atl2c_ids[] __initconst = {
+	{.compatible = "andestech,atl2c",}
+};
+
+static int __init atl2c_of_init(void)
+{
+	struct device_node *np;
+	struct resource res;
+	unsigned long tmp = 0;
+	unsigned long l2set, l2way, l2clsz;
+
+	if (!(__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskL2C))
+		return -ENODEV;
+
+	np = of_find_matching_node(NULL, atl2c_ids);
+	if (!np)
+		return -ENODEV;
+
+	if (of_address_to_resource(np, 0, &res))
+		return -ENODEV;
+
+	atl2c_base = ioremap(res.start, resource_size(&res));
+	if (!atl2c_base)
+		return -ENOMEM;
+
+	l2set =
+	    64 << ((L2C_R_REG(L2_CA_CONF_OFF) & L2_CA_CONF_mskL2SET) >>
+		   L2_CA_CONF_offL2SET);
+	l2way =
+	    1 +
+	    ((L2C_R_REG(L2_CA_CONF_OFF) & L2_CA_CONF_mskL2WAY) >>
+	     L2_CA_CONF_offL2WAY);
+	l2clsz =
+	    4 << ((L2C_R_REG(L2_CA_CONF_OFF) & L2_CA_CONF_mskL2CLSZ) >>
+		  L2_CA_CONF_offL2CLSZ);
+	pr_info("L2:%luKB/%luS/%luW/%luB\n",
+		l2set * l2way * l2clsz / 1024, l2set, l2way, l2clsz);
+
+	tmp = L2C_R_REG(L2CC_PROT_OFF);
+	tmp &= ~L2CC_PROT_mskMRWEN;
+	L2C_W_REG(L2CC_PROT_OFF, tmp);
+
+	tmp = L2C_R_REG(L2CC_SETUP_OFF);
+	tmp &= ~L2CC_SETUP_mskPART;
+	L2C_W_REG(L2CC_SETUP_OFF, tmp);
+
+	tmp = L2C_R_REG(L2CC_CTRL_OFF);
+	tmp |= L2CC_CTRL_mskEN;
+	L2C_W_REG(L2CC_CTRL_OFF, tmp);
+
+	return 0;
+}
+
+subsys_initcall(atl2c_of_init);
diff --git a/arch/nds32/kernel/cacheinfo.c b/arch/nds32/kernel/cacheinfo.c
new file mode 100644
index 0000000..0a7bc69
--- /dev/null
+++ b/arch/nds32/kernel/cacheinfo.c
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/bitops.h>
+#include <linux/cacheinfo.h>
+#include <linux/cpu.h>
+
+static void ci_leaf_init(struct cacheinfo *this_leaf,
+			 enum cache_type type, unsigned int level)
+{
+	char cache_type = (type & CACHE_TYPE_INST ? ICACHE : DCACHE);
+
+	this_leaf->level = level;
+	this_leaf->type = type;
+	this_leaf->coherency_line_size = CACHE_LINE_SIZE(cache_type);
+	this_leaf->number_of_sets = CACHE_SET(cache_type);;
+	this_leaf->ways_of_associativity = CACHE_WAY(cache_type);
+	this_leaf->size = this_leaf->number_of_sets *
+	    this_leaf->coherency_line_size * this_leaf->ways_of_associativity;
+#if defined(CONFIG_CPU_DCACHE_WRITETHROUGH)
+	this_leaf->attributes = CACHE_WRITE_THROUGH;
+#else
+	this_leaf->attributes = CACHE_WRITE_BACK;
+#endif
+}
+
+int init_cache_level(unsigned int cpu)
+{
+	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
+
+	/* Only 1 level and I/D cache seperate. */
+	this_cpu_ci->num_levels = 1;
+	this_cpu_ci->num_leaves = 2;
+	return 0;
+}
+
+int populate_cache_leaves(unsigned int cpu)
+{
+	unsigned int level, idx;
+	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
+	struct cacheinfo *this_leaf = this_cpu_ci->info_list;
+
+	for (idx = 0, level = 1; level <= this_cpu_ci->num_levels &&
+	     idx < this_cpu_ci->num_leaves; idx++, level++) {
+		ci_leaf_init(this_leaf++, CACHE_TYPE_DATA, level);
+		ci_leaf_init(this_leaf++, CACHE_TYPE_INST, level);
+	}
+	return 0;
+}
diff --git a/arch/nds32/kernel/devtree.c b/arch/nds32/kernel/devtree.c
new file mode 100644
index 0000000..bdce0fe
--- /dev/null
+++ b/arch/nds32/kernel/devtree.c
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/bug.h>
+#include <linux/printk.h>
+#include <linux/of_fdt.h>
+
+void __init early_init_devtree(void *params)
+{
+	if (!params || !early_init_dt_scan(params)) {
+		pr_crit("\n"
+			"Error: invalid device tree blob at (virtual address 0x%p)\n"
+			"\nPlease check your bootloader.", params);
+
+		BUG_ON(1);
+	}
+
+	dump_stack_set_arch_desc("%s (DT)", of_flat_dt_get_machine_name());
+}
diff --git a/arch/nds32/kernel/dma.c b/arch/nds32/kernel/dma.c
new file mode 100644
index 0000000..d291800
--- /dev/null
+++ b/arch/nds32/kernel/dma.c
@@ -0,0 +1,477 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/export.h>
+#include <linux/string.h>
+#include <linux/scatterlist.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/cache.h>
+#include <linux/highmem.h>
+#include <linux/slab.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+#include <asm/dma-mapping.h>
+#include <asm/proc-fns.h>
+
+/*
+ * This is the page table (2MB) covering uncached, DMA consistent allocations
+ */
+static pte_t *consistent_pte;
+static DEFINE_RAW_SPINLOCK(consistent_lock);
+
+enum master_type {
+	FOR_CPU = 0,
+	FOR_DEVICE = 1,
+};
+
+/*
+ * VM region handling support.
+ *
+ * This should become something generic, handling VM region allocations for
+ * vmalloc and similar (ioremap, module space, etc).
+ *
+ * I envisage vmalloc()'s supporting vm_struct becoming:
+ *
+ *  struct vm_struct {
+ *    struct vm_region	region;
+ *    unsigned long	flags;
+ *    struct page	**pages;
+ *    unsigned int	nr_pages;
+ *    unsigned long	phys_addr;
+ *  };
+ *
+ * get_vm_area() would then call vm_region_alloc with an appropriate
+ * struct vm_region head (eg):
+ *
+ *  struct vm_region vmalloc_head = {
+ *	.vm_list	= LIST_HEAD_INIT(vmalloc_head.vm_list),
+ *	.vm_start	= VMALLOC_START,
+ *	.vm_end		= VMALLOC_END,
+ *  };
+ *
+ * However, vmalloc_head.vm_start is variable (typically, it is dependent on
+ * the amount of RAM found at boot time.)  I would imagine that get_vm_area()
+ * would have to initialise this each time prior to calling vm_region_alloc().
+ */
+struct arch_vm_region {
+	struct list_head vm_list;
+	unsigned long vm_start;
+	unsigned long vm_end;
+	struct page *vm_pages;
+};
+
+static struct arch_vm_region consistent_head = {
+	.vm_list = LIST_HEAD_INIT(consistent_head.vm_list),
+	.vm_start = CONSISTENT_BASE,
+	.vm_end = CONSISTENT_END,
+};
+
+static struct arch_vm_region *vm_region_alloc(struct arch_vm_region *head,
+					      size_t size, int gfp)
+{
+	unsigned long addr = head->vm_start, end = head->vm_end - size;
+	unsigned long flags;
+	struct arch_vm_region *c, *new;
+
+	new = kmalloc(sizeof(struct arch_vm_region), gfp);
+	if (!new)
+		goto out;
+
+	raw_spin_lock_irqsave(&consistent_lock, flags);
+
+	list_for_each_entry(c, &head->vm_list, vm_list) {
+		if ((addr + size) < addr)
+			goto nospc;
+		if ((addr + size) <= c->vm_start)
+			goto found;
+		addr = c->vm_end;
+		if (addr > end)
+			goto nospc;
+	}
+
+found:
+	/*
+	 * Insert this entry _before_ the one we found.
+	 */
+	list_add_tail(&new->vm_list, &c->vm_list);
+	new->vm_start = addr;
+	new->vm_end = addr + size;
+
+	raw_spin_unlock_irqrestore(&consistent_lock, flags);
+	return new;
+
+nospc:
+	raw_spin_unlock_irqrestore(&consistent_lock, flags);
+	kfree(new);
+out:
+	return NULL;
+}
+
+static struct arch_vm_region *vm_region_find(struct arch_vm_region *head,
+					     unsigned long addr)
+{
+	struct arch_vm_region *c;
+
+	list_for_each_entry(c, &head->vm_list, vm_list) {
+		if (c->vm_start == addr)
+			goto out;
+	}
+	c = NULL;
+out:
+	return c;
+}
+
+/* FIXME: attrs is not used. */
+static void *nds32_dma_alloc_coherent(struct device *dev, size_t size,
+				      dma_addr_t * handle, gfp_t gfp,
+				      unsigned long attrs)
+{
+	struct page *page;
+	struct arch_vm_region *c;
+	unsigned long order;
+	u64 mask = ~0ULL, limit;
+	pgprot_t prot = pgprot_noncached(PAGE_KERNEL);
+
+	if (!consistent_pte) {
+		pr_err("%s: not initialized\n", __func__);
+		dump_stack();
+		return NULL;
+	}
+
+	if (dev) {
+		mask = dev->coherent_dma_mask;
+
+		/*
+		 * Sanity check the DMA mask - it must be non-zero, and
+		 * must be able to be satisfied by a DMA allocation.
+		 */
+		if (mask == 0) {
+			dev_warn(dev, "coherent DMA mask is unset\n");
+			goto no_page;
+		}
+
+	}
+
+	/*
+	 * Sanity check the allocation size.
+	 */
+	size = PAGE_ALIGN(size);
+	limit = (mask + 1) & ~mask;
+	if ((limit && size >= limit) ||
+	    size >= (CONSISTENT_END - CONSISTENT_BASE)) {
+		pr_warn("coherent allocation too big "
+			"(requested %#x mask %#llx)\n", size, mask);
+		goto no_page;
+	}
+
+	order = get_order(size);
+
+	if (mask != 0xffffffff)
+		gfp |= GFP_DMA;
+
+	page = alloc_pages(gfp, order);
+	if (!page)
+		goto no_page;
+
+	/*
+	 * Invalidate any data that might be lurking in the
+	 * kernel direct-mapped region for device DMA.
+	 */
+	{
+		unsigned long kaddr = (unsigned long)page_address(page);
+		memset(page_address(page), 0, size);
+		cpu_dma_wbinval_range(kaddr, kaddr + size);
+	}
+
+	/*
+	 * Allocate a virtual address in the consistent mapping region.
+	 */
+	c = vm_region_alloc(&consistent_head, size,
+			    gfp & ~(__GFP_DMA | __GFP_HIGHMEM));
+	if (c) {
+		pte_t *pte = consistent_pte + CONSISTENT_OFFSET(c->vm_start);
+		struct page *end = page + (1 << order);
+
+		c->vm_pages = page;
+
+		/*
+		 * Set the "dma handle"
+		 */
+		*handle = page_to_phys(page);
+
+		do {
+			BUG_ON(!pte_none(*pte));
+
+			/*
+			 * x86 does not mark the pages reserved...
+			 */
+			SetPageReserved(page);
+			set_pte(pte, mk_pte(page, prot));
+			page++;
+			pte++;
+		} while (size -= PAGE_SIZE);
+
+		/*
+		 * Free the otherwise unused pages.
+		 */
+		while (page < end) {
+			__free_page(page);
+			page++;
+		}
+
+		return (void *)c->vm_start;
+	}
+
+	if (page)
+		__free_pages(page, order);
+no_page:
+	*handle = ~0;
+	return NULL;
+}
+
+static void nds32_dma_free(struct device *dev, size_t size, void *cpu_addr,
+			   dma_addr_t handle, unsigned long attrs)
+{
+	struct arch_vm_region *c;
+	unsigned long flags, addr;
+	pte_t *ptep;
+
+	size = PAGE_ALIGN(size);
+
+	raw_spin_lock_irqsave(&consistent_lock, flags);
+
+	c = vm_region_find(&consistent_head, (unsigned long)cpu_addr);
+	if (!c)
+		goto no_area;
+
+	if ((c->vm_end - c->vm_start) != size) {
+		pr_err("%s: freeing wrong coherent size (%ld != %d)\n",
+		       __func__, c->vm_end - c->vm_start, size);
+		dump_stack();
+		size = c->vm_end - c->vm_start;
+	}
+
+	ptep = consistent_pte + CONSISTENT_OFFSET(c->vm_start);
+	addr = c->vm_start;
+	do {
+		pte_t pte = ptep_get_and_clear(&init_mm, addr, ptep);
+		unsigned long pfn;
+
+		ptep++;
+		addr += PAGE_SIZE;
+
+		if (!pte_none(pte) && pte_present(pte)) {
+			pfn = pte_pfn(pte);
+
+			if (pfn_valid(pfn)) {
+				struct page *page = pfn_to_page(pfn);
+
+				/*
+				 * x86 does not mark the pages reserved...
+				 */
+				ClearPageReserved(page);
+
+				__free_page(page);
+				continue;
+			}
+		}
+
+		pr_crit("%s: bad page in kernel page table\n", __func__);
+	} while (size -= PAGE_SIZE);
+
+	flush_tlb_kernel_range(c->vm_start, c->vm_end);
+
+	list_del(&c->vm_list);
+
+	raw_spin_unlock_irqrestore(&consistent_lock, flags);
+
+	kfree(c);
+	return;
+
+no_area:
+	raw_spin_unlock_irqrestore(&consistent_lock, flags);
+	pr_err("%s: trying to free invalid coherent area: %p\n",
+	       __func__, cpu_addr);
+	dump_stack();
+}
+
+/*
+ * Initialise the consistent memory allocation.
+ */
+static int __init consistent_init(void)
+{
+	pgd_t *pgd;
+	pmd_t *pmd;
+	pte_t *pte;
+	int ret = 0;
+
+	do {
+		pgd = pgd_offset(&init_mm, CONSISTENT_BASE);
+		pmd = pmd_alloc(&init_mm, pgd, CONSISTENT_BASE);
+		if (!pmd) {
+			pr_err("%s: no pmd tables\n", __func__);
+			ret = -ENOMEM;
+			break;
+		}
+		/* The first level mapping may be created in somewhere.
+		 * It's not necessary to warn here. */
+		/* WARN_ON(!pmd_none(*pmd)); */
+
+		pte = pte_alloc_kernel(pmd, CONSISTENT_BASE);
+		if (!pte) {
+			ret = -ENOMEM;
+			break;
+		}
+
+		consistent_pte = pte;
+	} while (0);
+
+	return ret;
+}
+
+core_initcall(consistent_init);
+static void consistent_sync(void *vaddr, size_t size, int direction, int master_type);
+static dma_addr_t nds32_dma_map_page(struct device *dev, struct page *page,
+				     unsigned long offset, size_t size,
+				     enum dma_data_direction dir,
+				     unsigned long attrs)
+{
+	if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+		consistent_sync((void *)(page_address(page) + offset), size, dir, FOR_DEVICE);
+	return page_to_phys(page) + offset;
+}
+
+static void nds32_dma_unmap_page(struct device *dev, dma_addr_t handle,
+				 size_t size, enum dma_data_direction dir,
+				 unsigned long attrs)
+{
+	if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+		consistent_sync(phys_to_virt(handle), size, dir, FOR_CPU);
+}
+
+/*
+ * Make an area consistent for devices.
+ */
+static void consistent_sync(void *vaddr, size_t size, int direction, int master_type)
+{
+	unsigned long start = (unsigned long)vaddr;
+	unsigned long end = start + size;
+
+	if (master_type == FOR_CPU) {
+		switch (direction) {
+		case DMA_TO_DEVICE:
+			break;
+		case DMA_FROM_DEVICE:
+		case DMA_BIDIRECTIONAL:
+			cpu_dma_inval_range(start, end);
+			break;
+		default:
+			BUG();
+		}
+	} else {
+		/* FOR_DEVICE */
+		switch (direction) {
+		case DMA_FROM_DEVICE:
+			break;
+		case DMA_TO_DEVICE:
+		case DMA_BIDIRECTIONAL:
+			cpu_dma_wb_range(start, end);
+			break;
+		default:
+			BUG();
+		}
+	}
+}
+
+static int nds32_dma_map_sg(struct device *dev, struct scatterlist *sg,
+			    int nents, enum dma_data_direction dir,
+			    unsigned long attrs)
+{
+	int i;
+
+	for (i = 0; i < nents; i++, sg++) {
+		void *virt;
+		unsigned long pfn;
+		struct page *page = sg_page(sg);
+
+		sg->dma_address = sg_phys(sg);
+		pfn = page_to_pfn(page) + sg->offset / PAGE_SIZE;
+		page = pfn_to_page(pfn);
+		if (PageHighMem(page)) {
+			virt = kmap_atomic(page);
+			consistent_sync(virt, sg->length, dir, FOR_CPU);
+			kunmap_atomic(virt);
+		} else {
+			if (sg->offset > PAGE_SIZE)
+				panic("sg->offset:%08x > PAGE_SIZE\n",
+				      sg->offset);
+			virt = page_address(page) + sg->offset;
+			consistent_sync(virt, sg->length, dir, FOR_CPU);
+		}
+	}
+	return nents;
+}
+
+static void nds32_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
+			       int nhwentries, enum dma_data_direction dir,
+			       unsigned long attrs)
+{
+}
+
+static void
+nds32_dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle,
+			      size_t size, enum dma_data_direction dir)
+{
+	consistent_sync((void *)phys_to_virt(handle), size, dir, FOR_CPU);
+}
+
+static void
+nds32_dma_sync_single_for_device(struct device *dev, dma_addr_t handle,
+				 size_t size, enum dma_data_direction dir)
+{
+	consistent_sync((void *)phys_to_virt(handle), size, dir, FOR_DEVICE);
+}
+
+static void
+nds32_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
+			  enum dma_data_direction dir)
+{
+	int i;
+
+	for (i = 0; i < nents; i++, sg++) {
+		char *virt =
+		    page_address((struct page *)sg->page_link) + sg->offset;
+		consistent_sync(virt, sg->length, dir, FOR_CPU);
+	}
+}
+
+static void
+nds32_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
+			     int nents, enum dma_data_direction dir)
+{
+	int i;
+
+	for (i = 0; i < nents; i++, sg++) {
+		char *virt =
+		    page_address((struct page *)sg->page_link) + sg->offset;
+		consistent_sync(virt, sg->length, dir, FOR_DEVICE);
+	}
+}
+
+struct dma_map_ops nds32_dma_ops = {
+	.alloc = nds32_dma_alloc_coherent,
+	.free = nds32_dma_free,
+	.map_page = nds32_dma_map_page,
+	.unmap_page = nds32_dma_unmap_page,
+	.map_sg = nds32_dma_map_sg,
+	.unmap_sg = nds32_dma_unmap_sg,
+	.sync_single_for_device = nds32_dma_sync_single_for_device,
+	.sync_single_for_cpu = nds32_dma_sync_single_for_cpu,
+	.sync_sg_for_cpu = nds32_dma_sync_sg_for_cpu,
+	.sync_sg_for_device = nds32_dma_sync_sg_for_device,
+};
+
+EXPORT_SYMBOL(nds32_dma_ops);
diff --git a/arch/nds32/kernel/ex-entry.S b/arch/nds32/kernel/ex-entry.S
new file mode 100644
index 0000000..a72e83d
--- /dev/null
+++ b/arch/nds32/kernel/ex-entry.S
@@ -0,0 +1,157 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+#include <asm/memory.h>
+#include <asm/nds32.h>
+#include <asm/errno.h>
+#include <asm/asm-offsets.h>
+#include <asm/page.h>
+
+#ifdef CONFIG_HWZOL
+	.macro push_zol
+	mfusr	$r14, $LB
+	mfusr	$r15, $LE
+	mfusr	$r16, $LC
+	.endm
+#endif
+
+	.macro	save_user_regs
+
+	smw.adm $sp, [$sp], $sp, #0x1
+	/* move $SP to the bottom of pt_regs */
+	addi    $sp, $sp, -OSP_OFFSET
+
+	/* push $r0 ~ $r25 */
+	smw.bim $r0, [$sp], $r25
+	/* push $fp, $gp, $lp */
+	smw.bim $sp, [$sp], $sp, #0xe
+
+	mfsr	$r12, $SP_USR
+	mfsr	$r13, $IPC
+#ifdef CONFIG_HWZOL
+	push_zol
+#endif
+	movi	$r17, -1
+	move	$r18, $r0
+	mfsr	$r19, $PSW
+	mfsr	$r20, $IPSW
+	mfsr	$r21, $P_IPSW
+	mfsr	$r22, $P_IPC
+	mfsr	$r23, $P_P0
+	mfsr	$r24, $P_P1
+	smw.bim $r12, [$sp], $r24, #0
+	addi	$sp, $sp, -FUCOP_CTL_OFFSET
+
+	/* Initialize kernel space $fp */
+	andi    $p0, $r20, #PSW_mskPOM
+	movi    $p1, #0x0
+	cmovz   $fp, $p1, $p0
+
+	andi	$r16, $r19, #PSW_mskINTL
+	slti	$r17, $r16, #4
+	bnez	$r17, 1f
+	addi	$r17, $r19, #-2
+	mtsr	$r17, $PSW
+	isb
+1:
+	/* If it was superuser mode, we don't need to update $r25 */
+	bnez	$p0, 2f
+	la	$p0, __entry_task
+	lw	$r25, [$p0]
+2:
+	.endm
+
+	.text
+
+/*
+ * Exception Vector
+ */
+exception_handlers:
+	.long	unhandled_exceptions	!Reset/NMI
+	.long	unhandled_exceptions	!TLB fill
+	.long	do_page_fault		!PTE not present
+	.long	do_dispatch_tlb_misc	!TLB misc
+	.long	unhandled_exceptions	!TLB VLPT
+	.long	unhandled_exceptions	!Machine Error
+	.long	do_debug_trap		!Debug related
+	.long	do_dispatch_general	!General exception
+	.long	eh_syscall		!Syscall
+	.long	asm_do_IRQ		!IRQ
+
+common_exception_handler:
+	save_user_regs
+	mfsr	$p0, $ITYPE
+	andi	$p0, $p0, #ITYPE_mskVECTOR
+	srli	$p0, $p0, #ITYPE_offVECTOR
+	andi	$p1, $p0, #NDS32_VECTOR_mskNONEXCEPTION
+	bnez	$p1, 1f
+	sethi	$lp, hi20(ret_from_exception)
+	ori	$lp, $lp, lo12(ret_from_exception)
+	sethi	$p1, hi20(exception_handlers)
+	ori	$p1, $p1, lo12(exception_handlers)
+	lw	$p1, [$p1+$p0<<2]
+	move	$r0, $p0
+	mfsr	$r1, $EVA
+	mfsr	$r2, $ITYPE
+	move	$r3, $sp
+	mfsr    $r4, $OIPC
+	/* enable gie if it is enabled in IPSW. */
+	mfsr	$r21, $PSW
+	andi	$r20, $r20, #PSW_mskGIE	/* r20 is $IPSW*/
+	or	$r21, $r21, $r20
+	mtsr	$r21, $PSW
+	dsb
+	jr	$p1
+
+	/* syscall */
+1:
+	addi	$p1, $p0, #-NDS32_VECTOR_offEXCEPTION
+	bnez	$p1, 2f
+	sethi	$lp, hi20(ret_from_exception)
+	ori	$lp, $lp, lo12(ret_from_exception)
+	sethi	$p1, hi20(exception_handlers)
+	ori	$p1, $p1, lo12(exception_handlers)
+	lwi	$p1, [$p1+#NDS32_VECTOR_offEXCEPTION<<2]
+	jr	$p1
+
+	/* interrupt */
+2:
+#ifdef CONFIG_TRACE_IRQFLAGS
+	jal     arch_trace_hardirqs_off
+#endif
+	move	$r0, $sp
+	sethi	$lp, hi20(ret_from_intr)
+	ori	$lp, $lp, lo12(ret_from_intr)
+	sethi	$p0, hi20(exception_handlers)
+	ori	$p0, $p0, lo12(exception_handlers)
+	lwi	$p0, [$p0+#NDS32_VECTOR_offINTERRUPT<<2]
+	jr	$p0
+
+	.macro	EXCEPTION_VECTOR_DEBUG
+	.align 4
+	mfsr     $p0, $EDM_CTL
+	andi     $p0, $p0, EDM_CTL_mskV3_EDM_MODE
+	tnez     $p0, SWID_RAISE_INTERRUPT_LEVEL
+	.endm
+
+	.macro	EXCEPTION_VECTOR
+	.align 4
+	sethi	 $p0, hi20(common_exception_handler)
+	ori	 $p0, $p0, lo12(common_exception_handler)
+	jral.ton $p0, $p0
+	.endm
+
+	.section	".text.init", #alloc, #execinstr
+	.global	exception_vector
+exception_vector:
+.rept 6
+	EXCEPTION_VECTOR
+.endr
+	EXCEPTION_VECTOR_DEBUG
+.rept 121
+	EXCEPTION_VECTOR
+.endr
+	.align 4
+	.global	exception_vector_end
+exception_vector_end:
diff --git a/arch/nds32/kernel/ex-exit.S b/arch/nds32/kernel/ex-exit.S
new file mode 100644
index 0000000..03e4f77
--- /dev/null
+++ b/arch/nds32/kernel/ex-exit.S
@@ -0,0 +1,184 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+#include <asm/unistd.h>
+#include <asm/assembler.h>
+#include <asm/nds32.h>
+#include <asm/asm-offsets.h>
+#include <asm/thread_info.h>
+#include <asm/current.h>
+
+
+
+#ifdef CONFIG_HWZOL
+	.macro pop_zol
+	mtusr	$r14, $LB
+	mtusr	$r15, $LE
+	mtusr	$r16, $LC
+	.endm
+#endif
+
+	.macro	restore_user_regs_first
+	setgie.d
+	isb
+
+	addi	$sp, $sp, FUCOP_CTL_OFFSET
+
+	lmw.adm $r12, [$sp], $r24, #0x0
+	mtsr	$r12, $SP_USR
+	mtsr	$r13, $IPC
+#ifdef CONFIG_HWZOL
+	pop_zol
+#endif
+	mtsr	$r19, $PSW
+	mtsr	$r20, $IPSW
+	mtsr    $r21, $P_IPSW
+	mtsr	$r22, $P_IPC
+	mtsr	$r23, $P_P0
+	mtsr	$r24, $P_P1
+	lmw.adm $sp, [$sp], $sp, #0xe
+	.endm
+
+	.macro	restore_user_regs_last
+	pop	$p0
+	cmovn	$sp, $p0, $p0
+
+	iret
+	nop
+
+	.endm
+
+	.macro	restore_user_regs
+	restore_user_regs_first
+	lmw.adm $r0, [$sp], $r25, #0x0
+	addi	$sp, $sp, OSP_OFFSET
+	restore_user_regs_last
+	.endm
+
+	.macro	fast_restore_user_regs
+	restore_user_regs_first
+	lmw.adm $r1, [$sp], $r25, #0x0
+	addi	$sp, $sp, OSP_OFFSET-4
+	restore_user_regs_last
+	.endm
+
+#ifdef CONFIG_PREEMPT
+	.macro	preempt_stop
+	.endm
+#else
+	.macro	preempt_stop
+	setgie.d
+	isb
+	.endm
+#define	resume_kernel	no_work_pending
+#endif
+
+ENTRY(ret_from_exception)
+	preempt_stop
+ENTRY(ret_from_intr)
+
+/*
+ * judge Kernel or user mode
+ *
+ */
+	lwi	$p0, [$sp+(#IPSW_OFFSET)]	! Check if in nested interrupt
+	andi	$p0, $p0, #PSW_mskINTL
+	bnez	$p0, resume_kernel		! done with iret
+	j	resume_userspace
+
+
+/*
+ * This is the fast syscall return path.  We do as little as
+ * possible here, and this includes saving $r0 back into the SVC
+ * stack.
+ * fixed: tsk - $r25, syscall # - $r7, syscall table pointer - $r8
+ */
+ENTRY(ret_fast_syscall)
+	gie_disable
+	lwi	$r1, [tsk+#TSK_TI_FLAGS]
+	andi	$p1, $r1, #_TIF_WORK_MASK
+	bnez	$p1, fast_work_pending
+	fast_restore_user_regs			! iret
+
+/*
+ * Ok, we need to do extra processing,
+ * enter the slow path returning from syscall, while pending work.
+ */
+fast_work_pending:
+	swi	$r0, [$sp+(#R0_OFFSET)]		! what is different from ret_from_exception
+work_pending:
+	andi	$p1, $r1, #_TIF_NEED_RESCHED
+	bnez	$p1, work_resched
+
+	andi	$p1, $r1, #_TIF_SIGPENDING|#_TIF_NOTIFY_RESUME
+	beqz	$p1, no_work_pending
+
+	move	$r0, $sp			! 'regs'
+	gie_enable
+	bal	do_notify_resume
+	b       ret_slow_syscall
+work_resched:
+	bal	schedule			! path, return to user mode
+
+/*
+ * "slow" syscall return path.
+ */
+ENTRY(resume_userspace)
+ENTRY(ret_slow_syscall)
+	gie_disable
+	lwi	$p0, [$sp+(#IPSW_OFFSET)]	! Check if in nested interrupt
+	andi	$p0, $p0, #PSW_mskINTL
+	bnez	$p0, no_work_pending		! done with iret
+	lwi	$r1, [tsk+#TSK_TI_FLAGS]
+	andi	$p1, $r1, #_TIF_WORK_MASK
+	bnez	$p1, work_pending		! handle work_resched, sig_pend
+
+no_work_pending:
+#ifdef CONFIG_TRACE_IRQFLAGS
+	lwi	$p0, [$sp+(#IPSW_OFFSET)]
+	andi	$p0, $p0, #0x1
+	la	$r10, trace_hardirqs_off
+	la	$r9, trace_hardirqs_on
+	cmovz	$r9, $p0, $r10
+	jral	$r9
+#endif
+	restore_user_regs			! return from iret
+
+
+/*
+ * preemptive kernel
+ */
+#ifdef CONFIG_PREEMPT
+resume_kernel:
+	gie_disable
+	lwi	$t0, [tsk+#TSK_TI_PREEMPT]
+	bnez	$t0, no_work_pending
+need_resched:
+	lwi	$t0, [tsk+#TSK_TI_FLAGS]
+	andi	$p1, $t0, #_TIF_NEED_RESCHED
+	beqz	$p1, no_work_pending
+
+	lwi	$t0, [$sp+(#IPSW_OFFSET)]	! Interrupts off?
+	andi	$t0, $t0, #1
+	beqz	$t0, no_work_pending
+
+	jal	preempt_schedule_irq
+	b	need_resched
+#endif
+
+/*
+ * This is how we return from a fork.
+ */
+ENTRY(ret_from_fork)
+	bal	schedule_tail
+	beqz	$r6, 1f				! r6 stores fn for kernel thread
+	move	$r0, $r7			! prepare kernel thread arg
+	jral	$r6
+1:
+	lwi	$r1, [tsk+#TSK_TI_FLAGS]		! check for syscall tracing
+	andi	$p1, $r1, #_TIF_WORK_SYSCALL_LEAVE	! are we tracing syscalls?
+	beqz	$p1, ret_slow_syscall
+	move    $r0, $sp
+	bal	syscall_trace_leave
+	b	ret_slow_syscall
diff --git a/arch/nds32/kernel/ex-scall.S b/arch/nds32/kernel/ex-scall.S
new file mode 100644
index 0000000..36aa87e
--- /dev/null
+++ b/arch/nds32/kernel/ex-scall.S
@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+#include <asm/unistd.h>
+#include <asm/assembler.h>
+#include <asm/nds32.h>
+#include <asm/asm-offsets.h>
+#include <asm/thread_info.h>
+#include <asm/current.h>
+
+/*
+ * $r0 = previous task_struct,
+ * $r1 = next task_struct,
+ * previous and next are guaranteed not to be the same.
+ */
+
+ENTRY(__switch_to)
+
+	la	$p0, __entry_task
+	sw	$r1, [$p0]
+	move	$p1, $r0
+	addi	$p1, $p1, #THREAD_CPU_CONTEXT
+	smw.bi 	$r6, [$p1], $r14, #0xb		! push r6~r14, fp, lp, sp
+	move	$r25, $r1
+	addi	$r1, $r1, #THREAD_CPU_CONTEXT
+	lmw.bi 	$r6, [$r1], $r14, #0xb		! pop r6~r14, fp, lp, sp
+	ret
+
+
+#define tbl $r8
+
+/*
+ * $r7 will be writen as syscall nr
+ */
+	.macro	get_scno
+	lwi	$r7, [$sp + R15_OFFSET]
+	swi	$r7, [$sp + SYSCALLNO_OFFSET]
+	.endm
+
+	.macro	updateipc
+	addi	$r17, $r13, #4				! $r13 is $IPC
+	swi	$r17, [$sp + IPC_OFFSET]
+	.endm
+
+ENTRY(eh_syscall)
+	updateipc
+
+	get_scno
+	gie_enable
+
+	lwi	$p0, [tsk+#TSK_TI_FLAGS]		! check for syscall tracing
+
+	andi	$p1, $p0, #_TIF_WORK_SYSCALL_ENTRY	! are we tracing syscalls?
+	bnez	$p1, __sys_trace
+
+	la	$lp, ret_fast_syscall		! return address
+jmp_systbl:
+	addi	$p1, $r7, #-__NR_syscalls	! syscall number of syscall instruction is guarded by addembler
+	bgez	$p1, _SCNO_EXCEED		! call sys_* routine
+	la	tbl, sys_call_table		! load syscall table pointer
+	slli	$p1, $r7, #2
+	add	$p1, tbl, $p1
+	lwi	$p1, [$p1]
+	jr	$p1				! no return
+
+_SCNO_EXCEED:
+	ori	$r0, $r7, #0
+        ori	$r1, $sp, #0
+	b	bad_syscall
+
+/*
+ * This is the really slow path.  We're going to be doing
+ * context switches, and waiting for our parent to respond.
+ */
+__sys_trace:
+	move	$r0, $sp
+	bal	syscall_trace_enter
+	move	$r7, $r0
+	la	$lp, __sys_trace_return		! return address
+
+	addi    $p1, $r7, #1
+	beqz    $p1, ret_slow_syscall		! fatal signal is pending
+
+	addi	$p1, $sp, #R0_OFFSET		! pointer to regs
+	lmw.bi	$r0, [$p1], $r5			! have to reload $r0 - $r5
+	b	jmp_systbl
+
+__sys_trace_return:
+	swi	$r0, [$sp+#R0_OFFSET]		! T: save returned $r0
+	move	$r0, $sp			! set pt_regs for syscall_trace_leave
+	bal	syscall_trace_leave
+	b	ret_slow_syscall
+
+ENTRY(sys_rt_sigreturn_wrapper)
+	addi	$r0, $sp, #0
+	b	sys_rt_sigreturn
+ENDPROC(sys_rt_sigreturn_wrapper)
diff --git a/arch/nds32/kernel/head.S b/arch/nds32/kernel/head.S
new file mode 100644
index 0000000..71f57bd
--- /dev/null
+++ b/arch/nds32/kernel/head.S
@@ -0,0 +1,188 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/ptrace.h>
+#include <asm/asm-offsets.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/sizes.h>
+#include <asm/thread_info.h>
+
+#ifdef CONFIG_CPU_BIG_ENDIAN
+#define OF_DT_MAGIC 0xd00dfeed
+#else
+#define OF_DT_MAGIC 0xedfe0dd0
+#endif
+
+	.globl  swapper_pg_dir
+	.equ    swapper_pg_dir, TEXTADDR - 0x4000
+
+/*
+ * Kernel startup entry point.
+ */
+	.section ".head.text", "ax"
+	.type   _stext, %function
+ENTRY(_stext)
+	setgie.d                            ! Disable interrupt
+	isb
+/*
+ * Disable I/D-cache and enable it at a proper time
+ */
+	mfsr    $r0, $mr8
+	li      $r1, #~(CACHE_CTL_mskIC_EN|CACHE_CTL_mskDC_EN)
+	and     $r0, $r0, $r1
+	mtsr    $r0, $mr8
+
+/*
+ * Process device tree blob
+ */
+	andi 	$r0,$r2,#0x3
+	li	$r10, 0
+	bne     $r0, $r10, _nodtb
+	lwi	$r0, [$r2]
+	li	$r1, OF_DT_MAGIC
+	bne     $r0, $r1, _nodtb
+	move	$r10, $r2
+_nodtb:
+
+/*
+ * Create a temporary mapping area for booting, before start_kernel
+ */
+	sethi   $r4, hi20(swapper_pg_dir)
+	li      $p0, (PAGE_OFFSET - PHYS_OFFSET)
+	sub     $r4, $r4, $p0
+	tlbop   FlushAll            ! invalidate TLB\n"
+	isb
+	mtsr    $r4, $L1_PPTB       ! load page table pointer\n"
+
+/* set NTC0 cacheable/writeback, mutliple page size in use */
+	mfsr    $r3, $MMU_CTL
+	li      $r0, #~MMU_CTL_mskNTC0
+	and     $r3, $r3, $r0
+#ifdef CONFIG_ANDES_PAGE_SIZE_4KB
+	ori     $r3, $r3, #(MMU_CTL_mskMPZIU|(MMU_CTL_CACHEABLE_WB << MMU_CTL_offNTC0))
+#else
+	ori     $r3, $r3, #(MMU_CTL_mskMPZIU|(MMU_CTL_CACHEABLE_WB << MMU_CTL_offNTC0)|MMU_CTL_D8KB)
+#endif
+#ifdef CONFIG_HW_SUPPORT_UNALIGNMENT_ACCESS
+	li      $r0, #MMU_CTL_UNA
+	or      $r3, $r3, $r0
+#endif
+	mtsr    $r3, $MMU_CTL
+	isb
+
+/* set page size and size of kernel image */
+        mfsr    $r0, $MMU_CFG
+        srli    $r3, $r0, MMU_CFG_offfEPSZ
+        zeb     $r3, $r3
+        bnez    $r3, _extra_page_size_support
+#ifdef CONFIG_ANDES_PAGE_SIZE_4KB
+        li      $r5, #SZ_4K                 ! Use 4KB page size
+#else
+        li      $r5, #SZ_8K                 ! Use 8KB page size
+        li      $r3, #1
+#endif
+        mtsr    $r3, $TLB_MISC
+        b       _image_size_check
+
+_extra_page_size_support:                    ! Use epzs pages size
+        clz     $r6, $r3
+        subri   $r2, $r6, #31
+        li      $r3, #1
+        sll     $r3, $r3, $r2
+        /* MMU_CFG.EPSZ value -> meaning */
+        mul     $r5, $r3, $r3
+        slli    $r5, $r5, #14
+        /* MMU_CFG.EPSZ  -> TLB_MISC.ACC_PSZ */
+        addi    $r3, $r2, #0x2
+        mtsr    $r3, $TLB_MISC
+
+_image_size_check:
+        /* calculate the image maximum size accepted by TLB config */
+        andi    $r6, $r0, MMU_CFG_mskTBW
+        andi    $r0, $r0, MMU_CFG_mskTBS
+        srli    $r6, $r6, MMU_CFG_offTBW
+        srli    $r0, $r0, MMU_CFG_offTBS
+        /*
+         * we just map the kernel to the maximum way - 1 of tlb
+         * reserver one way for UART VA mapping
+         * it will cause page fault if UART mapping cover the kernel mapping
+         *
+         * direct mapping is not supported now.
+         */
+        li      $r2, 't'
+        beqz    $r6, __error                 ! MMU_CFG.TBW = 0 is direct mappin
+        addi    $r0, $r0, #0x2               ! MMU_CFG.TBS value -> meaning
+        sll     $r0, $r6, $r0                ! entries = k-way * n-set
+        mul     $r6, $r0, $r5                ! max size = entries * page size
+        /* check kernel image size */
+        la      $r3, (_end - PAGE_OFFSET)
+        li      $r2, 's'
+        bgt     $r3, $r6, __error
+
+	li      $r2, #(PHYS_OFFSET + TLB_DATA_kernel_text_attr)
+        li      $r3, PAGE_OFFSET
+        add     $r6, $r6, $r3
+
+_tlb:
+	mtsr    $r3, $TLB_VPN
+	dsb
+	tlbop   $r2, RWR
+	isb
+	add     $r3, $r3, $r5
+	add     $r2, $r2, $r5
+	bgt     $r6, $r3, _tlb
+	mfsr    $r3, $TLB_MISC      ! setup access page size
+	li      $r2, #~0xf
+	and     $r3, $r3, $r2
+#ifdef CONFIG_ANDES_PAGE_SIZE_8KB
+	ori    $r3, $r3, #0x1
+#endif
+	mtsr    $r3, $TLB_MISC
+
+	mfsr    $r0, $MISC_CTL      ! Enable BTB and RTP and shadow sp
+	ori     $r0, $r0, #MISC_init
+	mtsr    $r0, $MISC_CTL
+
+	mfsr    $p1, $PSW
+	li      $r15, #~PSW_clr             ! clear WBNA|DME|IME|DT|IT|POM|INTL|GIE
+	and     $p1, $p1, $r15
+	ori     $p1, $p1, #PSW_init
+	mtsr    $p1, $IPSW                  ! when iret, it will automatically enable MMU
+	la      $lp, __mmap_switched
+	mtsr    $lp, $IPC
+	iret
+	nop
+
+	.type   __switch_data, %object
+__switch_data:
+	.long   __bss_start                 ! $r6
+	.long   _end                        ! $r7
+	.long	__atags_pointer 	    ! $atag_pointer
+	.long   init_task                   ! $r9, move to $r25
+	.long   init_thread_union + THREAD_SIZE    ! $sp
+
+
+/*
+ * The following fragment of code is executed with the MMU on in MMU mode,
+ * and uses absolute addresses; this is not position independent.
+ */
+	.align
+	.type   __mmap_switched, %function
+__mmap_switched:
+	la  $r3, __switch_data
+	lmw.bim $r6, [$r3], $r9, #0b0001
+	move	$r25, $r9
+	move    $fp, #0             ! Clear  BSS (and zero $fp)
+	beq $r7, $r6, _RRT
+1:	swi.bi  $fp, [$r6], #4
+	bne $r7, $r6, 1b
+	swi	$r10, [$r8]
+
+_RRT:
+	b   start_kernel
+
+__error:
+	b   __error
diff --git a/arch/nds32/kernel/irq.c b/arch/nds32/kernel/irq.c
new file mode 100644
index 0000000..6ff5a67
--- /dev/null
+++ b/arch/nds32/kernel/irq.c
@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/irqchip.h>
+
+void __init init_IRQ(void)
+{
+	irqchip_init();
+}
diff --git a/arch/nds32/kernel/module.c b/arch/nds32/kernel/module.c
new file mode 100644
index 0000000..4167283
--- /dev/null
+++ b/arch/nds32/kernel/module.c
@@ -0,0 +1,278 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/module.h>
+#include <linux/elf.h>
+#include <linux/vmalloc.h>
+#include <linux/moduleloader.h>
+#include <asm/pgtable.h>
+
+void *module_alloc(unsigned long size)
+{
+	return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
+				    GFP_KERNEL, PAGE_KERNEL, 0, NUMA_NO_NODE,
+				    __builtin_return_address(0));
+}
+
+void module_free(struct module *module, void *region)
+{
+	vfree(region);
+}
+
+int module_frob_arch_sections(Elf_Ehdr * hdr,
+			      Elf_Shdr * sechdrs,
+			      char *secstrings, struct module *mod)
+{
+	return 0;
+}
+
+void do_reloc16(unsigned int val, unsigned int *loc, unsigned int val_mask,
+		unsigned int val_shift, unsigned int loc_mask,
+		unsigned int partial_in_place, unsigned int swap)
+{
+	unsigned int tmp = 0, tmp2 = 0;
+
+	__asm__ __volatile__("\tlhi.bi\t%0, [%2], 0\n"
+			     "\tbeqz\t%3, 1f\n"
+			     "\twsbh\t%0, %1\n"
+			     "1:\n":"=r"(tmp):"0"(tmp), "r"(loc), "r"(swap)
+	    );
+
+	tmp2 = tmp & loc_mask;
+	if (partial_in_place) {
+		tmp &= (!loc_mask);
+		tmp =
+		    tmp2 | ((tmp + ((val & val_mask) >> val_shift)) & val_mask);
+	} else {
+		tmp = tmp2 | ((val & val_mask) >> val_shift);
+	}
+
+	__asm__ __volatile__("\tbeqz\t%3, 2f\n"
+			     "\twsbh\t%0, %1\n"
+			     "2:\n"
+			     "\tshi.bi\t%0, [%2], 0\n":"=r"(tmp):"0"(tmp),
+			     "r"(loc), "r"(swap)
+	    );
+}
+
+void do_reloc32(unsigned int val, unsigned int *loc, unsigned int val_mask,
+		unsigned int val_shift, unsigned int loc_mask,
+		unsigned int partial_in_place, unsigned int swap)
+{
+	unsigned int tmp = 0, tmp2 = 0;
+
+	__asm__ __volatile__("\tlmw.bi\t%0, [%2], %0, 0\n"
+			     "\tbeqz\t%3, 1f\n"
+			     "\twsbh\t%0, %1\n"
+			     "\trotri\t%0, %1, 16\n"
+			     "1:\n":"=r"(tmp):"0"(tmp), "r"(loc), "r"(swap)
+	    );
+
+	tmp2 = tmp & loc_mask;
+	if (partial_in_place) {
+		tmp &= (!loc_mask);
+		tmp =
+		    tmp2 | ((tmp + ((val & val_mask) >> val_shift)) & val_mask);
+	} else {
+		tmp = tmp2 | ((val & val_mask) >> val_shift);
+	}
+
+	__asm__ __volatile__("\tbeqz\t%3, 2f\n"
+			     "\twsbh\t%0, %1\n"
+			     "\trotri\t%0, %1, 16\n"
+			     "2:\n"
+			     "\tsmw.bi\t%0, [%2], %0, 0\n":"=r"(tmp):"0"(tmp),
+			     "r"(loc), "r"(swap)
+	    );
+}
+
+static inline int exceed_limit(int offset, unsigned int val_mask,
+			       struct module *module, Elf32_Rela * rel,
+			       unsigned int relindex, unsigned int reloc_order)
+{
+	int abs_off = offset < 0 ? ~offset : offset;
+
+	if (abs_off & (~val_mask)) {
+		pr_err("\n%s: relocation type %d out of range.\n"
+		       "please rebuild the kernel module with gcc option \"-Wa,-mno-small-text\".\n",
+		       module->name, ELF32_R_TYPE(rel->r_info));
+		pr_err("section %d reloc %d offset 0x%x relative 0x%x.\n",
+		       relindex, reloc_order, rel->r_offset, offset);
+		return true;
+	}
+	return false;
+}
+
+#ifdef __NDS32_EL__
+#define NEED_SWAP 1
+#else
+#define NEED_SWAP 0
+#endif
+
+int
+apply_relocate_add(Elf32_Shdr * sechdrs, const char *strtab,
+		   unsigned int symindex, unsigned int relindex,
+		   struct module *module)
+{
+	Elf32_Shdr *symsec = sechdrs + symindex;
+	Elf32_Shdr *relsec = sechdrs + relindex;
+	Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
+	Elf32_Rela *rel = (void *)relsec->sh_addr;
+	unsigned int i;
+
+	for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rela); i++, rel++) {
+		Elf32_Addr *loc;
+		Elf32_Sym *sym;
+		Elf32_Addr v;
+		s32 offset;
+
+		offset = ELF32_R_SYM(rel->r_info);
+		if (offset < 0
+		    || offset > (symsec->sh_size / sizeof(Elf32_Sym))) {
+			pr_err("%s: bad relocation\n", module->name);
+			pr_err("section %d reloc %d\n", relindex, i);
+			return -ENOEXEC;
+		}
+
+		sym = ((Elf32_Sym *) symsec->sh_addr) + offset;
+
+		if (rel->r_offset < 0
+		    || rel->r_offset > dstsec->sh_size - sizeof(u16)) {
+			pr_err("%s: out of bounds relocation\n", module->name);
+			pr_err("section %d reloc %d offset 0x%0x size %d\n",
+			       relindex, i, rel->r_offset, dstsec->sh_size);
+			return -ENOEXEC;
+		}
+
+		loc = (Elf32_Addr *) (dstsec->sh_addr + rel->r_offset);
+		v = sym->st_value + rel->r_addend;
+
+		switch (ELF32_R_TYPE(rel->r_info)) {
+		case R_NDS32_NONE:
+		case R_NDS32_INSN16:
+		case R_NDS32_LABEL:
+		case R_NDS32_LONGCALL1:
+		case R_NDS32_LONGCALL2:
+		case R_NDS32_LONGCALL3:
+		case R_NDS32_LONGCALL4:
+		case R_NDS32_LONGJUMP1:
+		case R_NDS32_LONGJUMP2:
+		case R_NDS32_LONGJUMP3:
+		case R_NDS32_9_FIXED_RELA:
+		case R_NDS32_15_FIXED_RELA:
+		case R_NDS32_17_FIXED_RELA:
+		case R_NDS32_25_FIXED_RELA:
+		case R_NDS32_LOADSTORE:
+		case R_NDS32_DWARF2_OP1_RELA:
+		case R_NDS32_DWARF2_OP2_RELA:
+		case R_NDS32_DWARF2_LEB_RELA:
+		case R_NDS32_RELA_NOP_MIX ... R_NDS32_RELA_NOP_MAX:
+			break;
+
+		case R_NDS32_32_RELA:
+			do_reloc32(v, loc, 0xffffffff, 0, 0, 0, 0);
+			break;
+
+		case R_NDS32_HI20_RELA:
+			do_reloc32(v, loc, 0xfffff000, 12, 0xfff00000, 0,
+				   NEED_SWAP);
+			break;
+
+		case R_NDS32_LO12S3_RELA:
+			do_reloc32(v, loc, 0x00000fff, 3, 0xfffff000, 0,
+				   NEED_SWAP);
+			break;
+
+		case R_NDS32_LO12S2_RELA:
+			do_reloc32(v, loc, 0x00000fff, 2, 0xfffff000, 0,
+				   NEED_SWAP);
+			break;
+
+		case R_NDS32_LO12S1_RELA:
+			do_reloc32(v, loc, 0x00000fff, 1, 0xfffff000, 0,
+				   NEED_SWAP);
+			break;
+
+		case R_NDS32_LO12S0_RELA:
+		case R_NDS32_LO12S0_ORI_RELA:
+			do_reloc32(v, loc, 0x00000fff, 0, 0xfffff000, 0,
+				   NEED_SWAP);
+			break;
+
+		case R_NDS32_9_PCREL_RELA:
+			if (exceed_limit
+			    ((v - (Elf32_Addr) loc), 0x000000ff, module, rel,
+			     relindex, i))
+				return -ENOEXEC;
+			do_reloc16(v - (Elf32_Addr) loc, loc, 0x000001ff, 1,
+				   0xffffff00, 0, NEED_SWAP);
+			break;
+
+		case R_NDS32_15_PCREL_RELA:
+			if (exceed_limit
+			    ((v - (Elf32_Addr) loc), 0x00003fff, module, rel,
+			     relindex, i))
+				return -ENOEXEC;
+			do_reloc32(v - (Elf32_Addr) loc, loc, 0x00007fff, 1,
+				   0xffffc000, 0, NEED_SWAP);
+			break;
+
+		case R_NDS32_17_PCREL_RELA:
+			if (exceed_limit
+			    ((v - (Elf32_Addr) loc), 0x0000ffff, module, rel,
+			     relindex, i))
+				return -ENOEXEC;
+			do_reloc32(v - (Elf32_Addr) loc, loc, 0x0001ffff, 1,
+				   0xffff0000, 0, NEED_SWAP);
+			break;
+
+		case R_NDS32_25_PCREL_RELA:
+			if (exceed_limit
+			    ((v - (Elf32_Addr) loc), 0x00ffffff, module, rel,
+			     relindex, i))
+				return -ENOEXEC;
+			do_reloc32(v - (Elf32_Addr) loc, loc, 0x01ffffff, 1,
+				   0xff000000, 0, NEED_SWAP);
+			break;
+		case R_NDS32_WORD_9_PCREL_RELA:
+			if (exceed_limit
+			    ((v - (Elf32_Addr) loc), 0x000000ff, module, rel,
+			     relindex, i))
+				return -ENOEXEC;
+			do_reloc32(v - (Elf32_Addr) loc, loc, 0x000001ff, 1,
+				   0xffffff00, 0, NEED_SWAP);
+			break;
+
+		case R_NDS32_SDA15S3_RELA:
+		case R_NDS32_SDA15S2_RELA:
+		case R_NDS32_SDA15S1_RELA:
+		case R_NDS32_SDA15S0_RELA:
+			pr_err("%s: unsupported relocation type %d.\n",
+			       module->name, ELF32_R_TYPE(rel->r_info));
+			pr_err
+			    ("Small data section access doesn't work in the kernel space; "
+			     "please rebuild the kernel module with gcc option -mcmodel=large.\n");
+			pr_err("section %d reloc %d offset 0x%x size %d\n",
+			       relindex, i, rel->r_offset, dstsec->sh_size);
+			break;
+
+		default:
+			pr_err("%s: unsupported relocation type %d.\n",
+			       module->name, ELF32_R_TYPE(rel->r_info));
+			pr_err("section %d reloc %d offset 0x%x size %d\n",
+			       relindex, i, rel->r_offset, dstsec->sh_size);
+		}
+	}
+	return 0;
+}
+
+int
+module_finalize(const Elf32_Ehdr * hdr, const Elf_Shdr * sechdrs,
+		struct module *module)
+{
+	return 0;
+}
+
+void module_arch_cleanup(struct module *mod)
+{
+}
diff --git a/arch/nds32/kernel/nds32_ksyms.c b/arch/nds32/kernel/nds32_ksyms.c
new file mode 100644
index 0000000..5ecebd0
--- /dev/null
+++ b/arch/nds32/kernel/nds32_ksyms.c
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/in6.h>
+#include <linux/syscalls.h>
+#include <linux/uaccess.h>
+
+#include <asm/checksum.h>
+#include <asm/io.h>
+#include <asm/ftrace.h>
+#include <asm/proc-fns.h>
+
+/* mem functions */
+EXPORT_SYMBOL(memset);
+EXPORT_SYMBOL(memcpy);
+EXPORT_SYMBOL(memmove);
+EXPORT_SYMBOL(memzero);
+
+/* user mem (segment) */
+EXPORT_SYMBOL(__arch_copy_from_user);
+EXPORT_SYMBOL(__arch_copy_to_user);
+EXPORT_SYMBOL(__arch_clear_user);
+
+/* cache handling */
+EXPORT_SYMBOL(cpu_icache_inval_all);
+EXPORT_SYMBOL(cpu_dcache_wbinval_all);
+EXPORT_SYMBOL(cpu_dma_inval_range);
+EXPORT_SYMBOL(cpu_dma_wb_range);
diff --git a/arch/nds32/kernel/process.c b/arch/nds32/kernel/process.c
new file mode 100644
index 0000000..65fda98
--- /dev/null
+++ b/arch/nds32/kernel/process.c
@@ -0,0 +1,208 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/sched.h>
+#include <linux/sched/debug.h>
+#include <linux/sched/task_stack.h>
+#include <linux/delay.h>
+#include <linux/kallsyms.h>
+#include <linux/uaccess.h>
+#include <asm/elf.h>
+#include <asm/proc-fns.h>
+#include <linux/ptrace.h>
+#include <linux/reboot.h>
+
+extern void setup_mm_for_reboot(char mode);
+#ifdef CONFIG_PROC_FS
+struct proc_dir_entry *proc_dir_cpu;
+EXPORT_SYMBOL(proc_dir_cpu);
+#endif
+
+extern inline void arch_reset(char mode)
+{
+	if (mode == 's') {
+		/* Use cpu handler, jump to 0 */
+		cpu_reset(0);
+	}
+}
+
+void (*pm_power_off) (void);
+EXPORT_SYMBOL(pm_power_off);
+
+static char reboot_mode_nds32 = 'h';
+
+int __init reboot_setup(char *str)
+{
+	reboot_mode_nds32 = str[0];
+	return 1;
+}
+
+static int cpub_pwroff(void)
+{
+	return 0;
+}
+
+__setup("reboot=", reboot_setup);
+
+void machine_halt(void)
+{
+	cpub_pwroff();
+}
+
+EXPORT_SYMBOL(machine_halt);
+
+void machine_power_off(void)
+{
+	if (pm_power_off)
+		pm_power_off();
+}
+
+EXPORT_SYMBOL(machine_power_off);
+
+void machine_restart(char *cmd)
+{
+	/*
+	 * Clean and disable cache, and turn off interrupts
+	 */
+	cpu_proc_fin();
+
+	/*
+	 * Tell the mm system that we are going to reboot -
+	 * we may need it to insert some 1:1 mappings so that
+	 * soft boot works.
+	 */
+	setup_mm_for_reboot(reboot_mode_nds32);
+
+	/* Execute kernel restart handler call chain */
+	do_kernel_restart(cmd);
+
+	/*
+	 * Now call the architecture specific reboot code.
+	 */
+	arch_reset(reboot_mode_nds32);
+
+	/*
+	 * Whoops - the architecture was unable to reboot.
+	 * Tell the user!
+	 */
+	mdelay(1000);
+	pr_info("Reboot failed -- System halted\n");
+	while (1) ;
+}
+
+EXPORT_SYMBOL(machine_restart);
+
+void show_regs(struct pt_regs *regs)
+{
+	printk("PC is at %pS\n", (void *)instruction_pointer(regs));
+	printk("LP is at %pS\n", (void *)regs->lp);
+	pr_info("pc : [<%08lx>]    lp : [<%08lx>]    %s\n"
+		"sp : %08lx  fp : %08lx  gp : %08lx\n",
+		instruction_pointer(regs),
+		regs->lp, print_tainted(), regs->sp, regs->fp, regs->gp);
+	pr_info("r25: %08lx  r24: %08lx\n", regs->uregs[25], regs->uregs[24]);
+
+	pr_info("r23: %08lx  r22: %08lx  r21: %08lx  r20: %08lx\n",
+		regs->uregs[23], regs->uregs[22],
+		regs->uregs[21], regs->uregs[20]);
+	pr_info("r19: %08lx  r18: %08lx  r17: %08lx  r16: %08lx\n",
+		regs->uregs[19], regs->uregs[18],
+		regs->uregs[17], regs->uregs[16]);
+	pr_info("r15: %08lx  r14: %08lx  r13: %08lx  r12: %08lx\n",
+		regs->uregs[15], regs->uregs[14],
+		regs->uregs[13], regs->uregs[12]);
+	pr_info("r11: %08lx  r10: %08lx  r9 : %08lx  r8 : %08lx\n",
+		regs->uregs[11], regs->uregs[10],
+		regs->uregs[9], regs->uregs[8]);
+	pr_info("r7 : %08lx  r6 : %08lx  r5 : %08lx  r4 : %08lx\n",
+		regs->uregs[7], regs->uregs[6], regs->uregs[5], regs->uregs[4]);
+	pr_info("r3 : %08lx  r2 : %08lx  r1 : %08lx  r0 : %08lx\n",
+		regs->uregs[3], regs->uregs[2], regs->uregs[1], regs->uregs[0]);
+	pr_info("  IRQs o%s  Segment %s\n",
+		interrupts_enabled(regs) ? "n" : "ff",
+		segment_eq(get_fs(), get_ds())? "kernel" : "user");
+}
+
+EXPORT_SYMBOL(show_regs);
+
+void flush_thread(void)
+{
+}
+
+DEFINE_PER_CPU(struct task_struct *, __entry_task);
+
+asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
+int copy_thread(unsigned long clone_flags, unsigned long stack_start,
+	    unsigned long stk_sz, struct task_struct *p)
+{
+	struct pt_regs *childregs = task_pt_regs(p);
+
+	memset(&p->thread.cpu_context, 0, sizeof(struct cpu_context));
+
+	if (unlikely(p->flags & PF_KTHREAD)) {
+		memset(childregs, 0, sizeof(struct pt_regs));
+		/* kernel thread fn */
+		p->thread.cpu_context.r6 = stack_start;
+		/* kernel thread argument */
+		p->thread.cpu_context.r7 = stk_sz;
+	} else {
+		*childregs = *current_pt_regs();
+		if (stack_start)
+			childregs->sp = stack_start;
+		/* child get zero as ret. */
+		childregs->uregs[0] = 0;
+		childregs->osp = 0;
+		if (clone_flags & CLONE_SETTLS)
+			childregs->uregs[25] = childregs->uregs[3];
+	}
+	/* cpu context switching  */
+	p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
+	p->thread.cpu_context.sp = (unsigned long)childregs;
+
+#ifdef CONFIG_HWZOL
+	childregs->lb = 0;
+	childregs->le = 0;
+	childregs->lc = 0;
+#endif
+
+	return 0;
+}
+
+/*
+ * fill in the fpe structure for a core dump...
+ */
+int dump_fpu(struct pt_regs *regs, elf_fpregset_t * fpu)
+{
+	int fpvalid = 0;
+	return fpvalid;
+}
+
+EXPORT_SYMBOL(dump_fpu);
+
+unsigned long get_wchan(struct task_struct *p)
+{
+	unsigned long fp, lr;
+	unsigned long stack_start, stack_end;
+	int count = 0;
+
+	if (!p || p == current || p->state == TASK_RUNNING)
+		return 0;
+
+	if (IS_ENABLED(CONFIG_FRAME_POINTER)) {
+		stack_start = (unsigned long)end_of_stack(p);
+		stack_end = (unsigned long)task_stack_page(p) + THREAD_SIZE;
+
+		fp = thread_saved_fp(p);
+		do {
+			if (fp < stack_start || fp > stack_end)
+				return 0;
+			lr = ((unsigned long *)fp)[0];
+			if (!in_sched_functions(lr))
+				return lr;
+			fp = *(unsigned long *)(fp + 4);
+		} while (count++ < 16);
+	}
+	return 0;
+}
+
+EXPORT_SYMBOL(get_wchan);
diff --git a/arch/nds32/kernel/ptrace.c b/arch/nds32/kernel/ptrace.c
new file mode 100644
index 0000000..eaaf7a9
--- /dev/null
+++ b/arch/nds32/kernel/ptrace.c
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/ptrace.h>
+#include <linux/regset.h>
+#include <linux/tracehook.h>
+#include <linux/elf.h>
+#include <linux/sched/task_stack.h>
+
+enum nds32_regset {
+	REGSET_GPR,
+};
+
+static int gpr_get(struct task_struct *target,
+		   const struct user_regset *regset,
+		   unsigned int pos, unsigned int count,
+		   void *kbuf, void __user * ubuf)
+{
+	struct user_pt_regs *uregs = &task_pt_regs(target)->user_regs;
+	return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
+}
+
+static int gpr_set(struct task_struct *target, const struct user_regset *regset,
+		   unsigned int pos, unsigned int count,
+		   const void *kbuf, const void __user * ubuf)
+{
+	int err;
+	struct user_pt_regs newregs = task_pt_regs(target)->user_regs;
+
+	err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs, 0, -1);
+	if (err)
+		return err;
+
+	task_pt_regs(target)->user_regs = newregs;
+	return 0;
+}
+
+static const struct user_regset nds32_regsets[] = {
+	[REGSET_GPR] = {
+			.core_note_type = NT_PRSTATUS,
+			.n = sizeof(struct user_pt_regs) / sizeof(u32),
+			.size = sizeof(elf_greg_t),
+			.align = sizeof(elf_greg_t),
+			.get = gpr_get,
+			.set = gpr_set}
+};
+
+static const struct user_regset_view nds32_user_view = {
+	.name = "nds32",
+	.e_machine = EM_NDS32,
+	.regsets = nds32_regsets,
+	.n = ARRAY_SIZE(nds32_regsets)
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+	return &nds32_user_view;
+}
+
+void ptrace_disable(struct task_struct *child)
+{
+	user_disable_single_step(child);
+}
+
+/* do_ptrace()
+ *
+ * Provide ptrace defined service.
+ */
+long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
+		 unsigned long data)
+{
+	int ret = -EIO;
+
+	switch (request) {
+	default:
+		ret = ptrace_request(child, request, addr, data);
+		break;
+	}
+
+	return ret;
+}
+
+void user_enable_single_step(struct task_struct *child)
+{
+	struct pt_regs *regs;
+	regs = task_pt_regs(child);
+	regs->ipsw |= PSW_mskHSS;
+	set_tsk_thread_flag(child, TIF_SINGLESTEP);
+}
+
+void user_disable_single_step(struct task_struct *child)
+{
+	struct pt_regs *regs;
+	regs = task_pt_regs(child);
+	regs->ipsw &= ~PSW_mskHSS;
+	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
+}
+
+/* sys_trace()
+ *
+ * syscall trace handler.
+ */
+
+asmlinkage int syscall_trace_enter(struct pt_regs *regs)
+{
+	if (test_thread_flag(TIF_SYSCALL_TRACE)) {
+		if (tracehook_report_syscall_entry(regs))
+			forget_syscall(regs);
+	}
+	return regs->syscallno;
+}
+
+asmlinkage void syscall_trace_leave(struct pt_regs *regs)
+{
+	int step = test_thread_flag(TIF_SINGLESTEP);
+	if (step || test_thread_flag(TIF_SYSCALL_TRACE))
+		tracehook_report_syscall_exit(regs, step);
+
+}
diff --git a/arch/nds32/kernel/setup.c b/arch/nds32/kernel/setup.c
new file mode 100644
index 0000000..ba910e9
--- /dev/null
+++ b/arch/nds32/kernel/setup.c
@@ -0,0 +1,363 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/cpu.h>
+#include <linux/bootmem.h>
+#include <linux/seq_file.h>
+#include <linux/memblock.h>
+#include <linux/console.h>
+#include <linux/screen_info.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/of_fdt.h>
+#include <linux/of_platform.h>
+#include <asm/setup.h>
+#include <asm/sections.h>
+#include <asm/proc-fns.h>
+#include <asm/cache_info.h>
+#include <asm/elf.h>
+#include <nds32_intrinsic.h>
+
+#define HWCAP_MFUSR_PC		0x000001
+#define HWCAP_EXT		0x000002
+#define HWCAP_EXT2		0x000004
+#define HWCAP_FPU		0x000008
+#define HWCAP_AUDIO		0x000010
+#define HWCAP_BASE16		0x000020
+#define HWCAP_STRING		0x000040
+#define HWCAP_REDUCED_REGS	0x000080
+#define HWCAP_VIDEO		0x000100
+#define HWCAP_ENCRYPT		0x000200
+#define HWCAP_EDM		0x000400
+#define HWCAP_LMDMA		0x000800
+#define HWCAP_PFM		0x001000
+#define HWCAP_HSMP		0x002000
+#define HWCAP_TRACE		0x004000
+#define HWCAP_DIV		0x008000
+#define HWCAP_MAC		0x010000
+#define HWCAP_L2C		0x020000
+#define HWCAP_FPU_DP		0x040000
+#define HWCAP_V2		0x080000
+#define HWCAP_DX_REGS		0x100000
+
+unsigned long cpu_id, cpu_rev, cpu_cfgid;
+char cpu_series;
+char *endianness = NULL;
+
+unsigned int __atags_pointer __initdata;
+unsigned int elf_hwcap;
+EXPORT_SYMBOL(elf_hwcap);
+
+/*
+ * The following string table, must sync with HWCAP_xx bitmask,
+ * which is defined in <asm/procinfo.h>
+ */
+static const char *hwcap_str[] = {
+	"mfusr_pc",
+	"perf1",
+	"perf2",
+	"fpu",
+	"audio",
+	"16b",
+	"string",
+	"reduced_regs",
+	"video",
+	"encrypt",
+	"edm",
+	"lmdma",
+	"pfm",
+	"hsmp",
+	"trace",
+	"div",
+	"mac",
+	"l2c",
+	"dx_regs",
+	"v2",
+	NULL,
+};
+
+#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
+#define WRITE_METHOD "write through"
+#else
+#define WRITE_METHOD "write back"
+#endif
+
+struct cache_info L1_cache_info[2];
+static void __init dump_cpu_info(int cpu)
+{
+	int i, p = 0;
+	char str[sizeof(hwcap_str) + 16];
+
+	for (i = 0; hwcap_str[i]; i++) {
+		if (elf_hwcap & (1 << i)) {
+			sprintf(str + p, "%s ", hwcap_str[i]);
+			p += strlen(hwcap_str[i]) + 1;
+		}
+	}
+
+	pr_info("CPU%d Features: %s\n", cpu, str);
+
+	L1_cache_info[ICACHE].ways = CACHE_WAY(ICACHE);
+	L1_cache_info[ICACHE].line_size = CACHE_LINE_SIZE(ICACHE);
+	L1_cache_info[ICACHE].sets = CACHE_SET(ICACHE);
+	L1_cache_info[ICACHE].size =
+	    L1_cache_info[ICACHE].ways * L1_cache_info[ICACHE].line_size *
+	    L1_cache_info[ICACHE].sets / 1024;
+	pr_info("L1I:%dKB/%dS/%dW/%dB\n", L1_cache_info[ICACHE].size,
+		L1_cache_info[ICACHE].sets, L1_cache_info[ICACHE].ways,
+		L1_cache_info[ICACHE].line_size);
+	L1_cache_info[DCACHE].ways = CACHE_WAY(DCACHE);
+	L1_cache_info[DCACHE].line_size = CACHE_LINE_SIZE(DCACHE);
+	L1_cache_info[DCACHE].sets = CACHE_SET(DCACHE);
+	L1_cache_info[DCACHE].size =
+	    L1_cache_info[DCACHE].ways * L1_cache_info[DCACHE].line_size *
+	    L1_cache_info[DCACHE].sets / 1024;
+	pr_info("L1D:%dKB/%dS/%dW/%dB\n", L1_cache_info[DCACHE].size,
+		L1_cache_info[DCACHE].sets, L1_cache_info[DCACHE].ways,
+		L1_cache_info[DCACHE].line_size);
+	pr_info("L1 D-Cache is %s\n", WRITE_METHOD);
+	if (L1_cache_info[DCACHE].size != L1_CACHE_BYTES)
+		pr_crit
+		    ("The cache line size(%d) of this processor is not the same as L1_CACHE_BYTES(%d).\n",
+		     L1_cache_info[DCACHE].size, L1_CACHE_BYTES);
+#ifdef CONFIG_CPU_CACHE_ALIASING
+	{
+		int aliasing_num;
+		aliasing_num =
+		    L1_cache_info[ICACHE].size * 1024 / PAGE_SIZE /
+		    L1_cache_info[ICACHE].ways;
+		L1_cache_info[ICACHE].aliasing_num = aliasing_num;
+		L1_cache_info[ICACHE].aliasing_mask =
+		    (aliasing_num - 1) << PAGE_SHIFT;
+		aliasing_num =
+		    L1_cache_info[DCACHE].size * 1024 / PAGE_SIZE /
+		    L1_cache_info[DCACHE].ways;
+		L1_cache_info[DCACHE].aliasing_num = aliasing_num;
+		L1_cache_info[DCACHE].aliasing_mask =
+		    (aliasing_num - 1) << PAGE_SHIFT;
+	}
+#endif
+}
+
+static void __init setup_cpuinfo(void)
+{
+	unsigned long tmp = 0, cpu_name;
+
+	cpu_dcache_inval_all();
+	cpu_icache_inval_all();
+	__nds32__isb();
+
+	cpu_id = (__nds32__mfsr(NDS32_SR_CPU_VER) & CPU_VER_mskCPUID) >> CPU_VER_offCPUID;
+	cpu_name = ((cpu_id) & 0xf0) >> 4;
+	cpu_series = cpu_name ? cpu_name - 10 + 'A' : 'N';
+	cpu_id = cpu_id & 0xf;
+	cpu_rev = (__nds32__mfsr(NDS32_SR_CPU_VER) & CPU_VER_mskREV) >> CPU_VER_offREV;
+	cpu_cfgid = (__nds32__mfsr(NDS32_SR_CPU_VER) & CPU_VER_mskCFGID) >> CPU_VER_offCFGID;
+
+	pr_info("CPU:%c%ld, CPU_VER 0x%08x(id %lu, rev %lu, cfg %lu)\n",
+		cpu_series, cpu_id, __nds32__mfsr(NDS32_SR_CPU_VER), cpu_id, cpu_rev, cpu_cfgid);
+
+	elf_hwcap |= HWCAP_MFUSR_PC;
+
+	if (((__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskBASEV) >> MSC_CFG_offBASEV) == 0) {
+		if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskDIV)
+			elf_hwcap |= HWCAP_DIV;
+
+		if ((__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskMAC)
+		    || (cpu_id == 12 && cpu_rev < 4))
+			elf_hwcap |= HWCAP_MAC;
+	} else {
+		elf_hwcap |= HWCAP_V2;
+		elf_hwcap |= HWCAP_DIV;
+		elf_hwcap |= HWCAP_MAC;
+	}
+
+	if (cpu_cfgid & 0x0001)
+		elf_hwcap |= HWCAP_EXT;
+
+	if (cpu_cfgid & 0x0002)
+		elf_hwcap |= HWCAP_BASE16;
+
+	if (cpu_cfgid & 0x0004)
+		elf_hwcap |= HWCAP_EXT2;
+
+	if (cpu_cfgid & 0x0008)
+		elf_hwcap |= HWCAP_FPU;
+
+	if (cpu_cfgid & 0x0010)
+		elf_hwcap |= HWCAP_STRING;
+
+	if (__nds32__mfsr(NDS32_SR_MMU_CFG) & MMU_CFG_mskDE)
+		endianness = "MSB";
+	else
+		endianness = "LSB";
+
+	if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskEDM)
+		elf_hwcap |= HWCAP_EDM;
+
+	if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskLMDMA)
+		elf_hwcap |= HWCAP_LMDMA;
+
+	if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskPFM)
+		elf_hwcap |= HWCAP_PFM;
+
+	if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskHSMP)
+		elf_hwcap |= HWCAP_HSMP;
+
+	if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskTRACE)
+		elf_hwcap |= HWCAP_TRACE;
+
+	if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskAUDIO)
+		elf_hwcap |= HWCAP_AUDIO;
+
+	if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskL2C)
+		elf_hwcap |= HWCAP_L2C;
+
+	tmp = __nds32__mfsr(NDS32_SR_CACHE_CTL);
+	if (!IS_ENABLED(CONFIG_CPU_DCACHE_DISABLE))
+		tmp |= CACHE_CTL_mskDC_EN;
+
+	if (!IS_ENABLED(CONFIG_CPU_ICACHE_DISABLE))
+		tmp |= CACHE_CTL_mskIC_EN;
+	__nds32__mtsr_isb(tmp, NDS32_SR_CACHE_CTL);
+
+	dump_cpu_info(smp_processor_id());
+}
+
+static void __init setup_memory(void)
+{
+	unsigned long ram_start_pfn;
+	unsigned long free_ram_start_pfn;
+	phys_addr_t memory_start, memory_end;
+	struct memblock_region *region;
+
+	memory_end = memory_start = 0;
+
+	/* Find main memory where is the kernel */
+	for_each_memblock(memory, region) {
+		memory_start = region->base;
+		memory_end = region->base + region->size;
+		pr_info("%s: Memory: 0x%x-0x%x\n", __func__,
+			memory_start, memory_end);
+	}
+
+	if (!memory_end) {
+		panic("No memory!");
+	}
+
+	ram_start_pfn = PFN_UP(memblock_start_of_DRAM());
+	/* free_ram_start_pfn is first page after kernel */
+	free_ram_start_pfn = PFN_UP(__pa(&_end));
+	max_pfn = PFN_DOWN(memblock_end_of_DRAM());
+	/* it could update max_pfn */
+	if (max_pfn - ram_start_pfn <= MAXMEM_PFN)
+		max_low_pfn = max_pfn;
+	else {
+		max_low_pfn = MAXMEM_PFN + ram_start_pfn;
+		if (!IS_ENABLED(CONFIG_HIGHMEM))
+			max_pfn = MAXMEM_PFN + ram_start_pfn;
+	}
+	/* high_memory is related with VMALLOC */
+	high_memory = (void *)__va(max_low_pfn * PAGE_SIZE);
+	min_low_pfn = free_ram_start_pfn;
+
+	/*
+	 * initialize the boot-time allocator (with low memory only).
+	 *
+	 * This makes the memory from the end of the kernel to the end of
+	 * RAM usable.
+	 */
+	memblock_set_bottom_up(true);
+	memblock_reserve(PFN_PHYS(ram_start_pfn), PFN_PHYS(free_ram_start_pfn - ram_start_pfn));
+
+	early_init_fdt_reserve_self();
+	early_init_fdt_scan_reserved_mem();
+
+	memblock_dump_all();
+}
+
+void __init setup_arch(char **cmdline_p)
+{
+	early_init_devtree( __dtb_start);
+
+	setup_cpuinfo();
+
+	init_mm.start_code = (unsigned long)&_stext;
+	init_mm.end_code = (unsigned long)&_etext;
+	init_mm.end_data = (unsigned long)&_edata;
+	init_mm.brk = (unsigned long)&_end;
+
+	/* setup bootmem allocator */
+	setup_memory();
+
+	/* paging_init() sets up the MMU and marks all pages as reserved */
+	paging_init();
+
+	/* use generic way to parse */
+	parse_early_param();
+
+	unflatten_and_copy_device_tree();
+
+	if(IS_ENABLED(CONFIG_VT)) {
+		if(IS_ENABLED(CONFIG_DUMMY_CONSOLE))
+			conswitchp = &dummy_con;
+	}
+
+	*cmdline_p = boot_command_line;
+	early_trap_init();
+}
+
+static int c_show(struct seq_file *m, void *v)
+{
+	int i;
+
+	seq_printf(m, "Processor\t: %c%ld (id %lu, rev %lu, cfg %lu)\n",
+		   cpu_series, cpu_id, cpu_id, cpu_rev, cpu_cfgid);
+
+	seq_printf(m, "L1I\t\t: %luKB/%luS/%luW/%luB\n",
+		   CACHE_SET(ICACHE) * CACHE_WAY(ICACHE) *
+		   CACHE_LINE_SIZE(ICACHE) / 1024, CACHE_SET(ICACHE),
+		   CACHE_WAY(ICACHE), CACHE_LINE_SIZE(ICACHE));
+
+	seq_printf(m, "L1D\t\t: %luKB/%luS/%luW/%luB\n",
+		   CACHE_SET(DCACHE) * CACHE_WAY(DCACHE) *
+		   CACHE_LINE_SIZE(DCACHE) / 1024, CACHE_SET(DCACHE),
+		   CACHE_WAY(DCACHE), CACHE_LINE_SIZE(DCACHE));
+
+	seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
+		   loops_per_jiffy / (500000 / HZ),
+		   (loops_per_jiffy / (5000 / HZ)) % 100);
+
+	/* dump out the processor features */
+	seq_puts(m, "Features\t: ");
+
+	for (i = 0; hwcap_str[i]; i++)
+		if (elf_hwcap & (1 << i))
+			seq_printf(m, "%s ", hwcap_str[i]);
+
+	seq_puts(m, "\n\n");
+
+	return 0;
+}
+
+static void *c_start(struct seq_file *m, loff_t * pos)
+{
+	return *pos < 1 ? (void *)1 : NULL;
+}
+
+static void *c_next(struct seq_file *m, void *v, loff_t * pos)
+{
+	++*pos;
+	return NULL;
+}
+
+static void c_stop(struct seq_file *m, void *v)
+{
+}
+
+struct seq_operations cpuinfo_op = {
+	.start = c_start,
+	.next = c_next,
+	.stop = c_stop,
+	.show = c_show
+};
diff --git a/arch/nds32/kernel/signal.c b/arch/nds32/kernel/signal.c
new file mode 100644
index 0000000..5d01f6e
--- /dev/null
+++ b/arch/nds32/kernel/signal.c
@@ -0,0 +1,324 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/ptrace.h>
+#include <linux/personality.h>
+#include <linux/freezer.h>
+#include <linux/tracehook.h>
+#include <linux/uaccess.h>
+
+#include <asm/cacheflush.h>
+#include <asm/ucontext.h>
+#include <asm/unistd.h>
+
+#include <asm/ptrace.h>
+#include <asm/vdso.h>
+
+struct rt_sigframe {
+	struct siginfo info;
+	struct ucontext uc;
+};
+
+static int restore_sigframe(struct pt_regs *regs,
+			    struct rt_sigframe __user * sf)
+{
+	sigset_t set;
+	int err;
+
+	err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set));
+	if (err == 0) {
+		set_current_blocked(&set);
+	}
+
+	__get_user_error(regs->uregs[0], &sf->uc.uc_mcontext.nds32_r0, err);
+	__get_user_error(regs->uregs[1], &sf->uc.uc_mcontext.nds32_r1, err);
+	__get_user_error(regs->uregs[2], &sf->uc.uc_mcontext.nds32_r2, err);
+	__get_user_error(regs->uregs[3], &sf->uc.uc_mcontext.nds32_r3, err);
+	__get_user_error(regs->uregs[4], &sf->uc.uc_mcontext.nds32_r4, err);
+	__get_user_error(regs->uregs[5], &sf->uc.uc_mcontext.nds32_r5, err);
+	__get_user_error(regs->uregs[6], &sf->uc.uc_mcontext.nds32_r6, err);
+	__get_user_error(regs->uregs[7], &sf->uc.uc_mcontext.nds32_r7, err);
+	__get_user_error(regs->uregs[8], &sf->uc.uc_mcontext.nds32_r8, err);
+	__get_user_error(regs->uregs[9], &sf->uc.uc_mcontext.nds32_r9, err);
+	__get_user_error(regs->uregs[10], &sf->uc.uc_mcontext.nds32_r10, err);
+	__get_user_error(regs->uregs[11], &sf->uc.uc_mcontext.nds32_r11, err);
+	__get_user_error(regs->uregs[12], &sf->uc.uc_mcontext.nds32_r12, err);
+	__get_user_error(regs->uregs[13], &sf->uc.uc_mcontext.nds32_r13, err);
+	__get_user_error(regs->uregs[14], &sf->uc.uc_mcontext.nds32_r14, err);
+	__get_user_error(regs->uregs[15], &sf->uc.uc_mcontext.nds32_r15, err);
+	__get_user_error(regs->uregs[16], &sf->uc.uc_mcontext.nds32_r16, err);
+	__get_user_error(regs->uregs[17], &sf->uc.uc_mcontext.nds32_r17, err);
+	__get_user_error(regs->uregs[18], &sf->uc.uc_mcontext.nds32_r18, err);
+	__get_user_error(regs->uregs[19], &sf->uc.uc_mcontext.nds32_r19, err);
+	__get_user_error(regs->uregs[20], &sf->uc.uc_mcontext.nds32_r20, err);
+	__get_user_error(regs->uregs[21], &sf->uc.uc_mcontext.nds32_r21, err);
+	__get_user_error(regs->uregs[22], &sf->uc.uc_mcontext.nds32_r22, err);
+	__get_user_error(regs->uregs[23], &sf->uc.uc_mcontext.nds32_r23, err);
+	__get_user_error(regs->uregs[24], &sf->uc.uc_mcontext.nds32_r24, err);
+	__get_user_error(regs->uregs[25], &sf->uc.uc_mcontext.nds32_r25, err);
+
+	__get_user_error(regs->fp, &sf->uc.uc_mcontext.nds32_fp, err);
+	__get_user_error(regs->gp, &sf->uc.uc_mcontext.nds32_gp, err);
+	__get_user_error(regs->lp, &sf->uc.uc_mcontext.nds32_lp, err);
+	__get_user_error(regs->sp, &sf->uc.uc_mcontext.nds32_sp, err);
+	__get_user_error(regs->ipc, &sf->uc.uc_mcontext.nds32_ipc, err);
+#if defined(CONFIG_HWZOL)
+	__get_user_error(regs->lc, &sf->uc.uc_mcontext.zol.nds32_lc, err);
+	__get_user_error(regs->le, &sf->uc.uc_mcontext.zol.nds32_le, err);
+	__get_user_error(regs->lb, &sf->uc.uc_mcontext.zol.nds32_lb, err);
+#endif
+
+	/*
+	 * Avoid sys_rt_sigreturn() restarting.
+	 */
+	forget_syscall(regs);
+	return err;
+}
+
+asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
+{
+	struct rt_sigframe __user *frame;
+
+	/* Always make any pending restarted system calls return -EINTR */
+	current->restart_block.fn = do_no_restart_syscall;
+
+	/*
+	 * Since we stacked the signal on a 64-bit boundary,
+	 * then 'sp' should be two-word aligned here.  If it's
+	 * not, then the user is trying to mess with us.
+	 */
+	if (regs->sp & 7)
+		goto badframe;
+
+	frame = (struct rt_sigframe __user *)regs->sp;
+
+	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+		goto badframe;
+
+	if (restore_sigframe(regs, frame))
+		goto badframe;
+
+	if (restore_altstack(&frame->uc.uc_stack))
+		goto badframe;
+
+	return regs->uregs[0];
+
+badframe:
+	force_sig(SIGSEGV, current);
+	return 0;
+}
+
+static int
+setup_sigframe(struct rt_sigframe __user * sf, struct pt_regs *regs,
+	       sigset_t * set)
+{
+	int err = 0;
+
+	__put_user_error(regs->uregs[0], &sf->uc.uc_mcontext.nds32_r0, err);
+	__put_user_error(regs->uregs[1], &sf->uc.uc_mcontext.nds32_r1, err);
+	__put_user_error(regs->uregs[2], &sf->uc.uc_mcontext.nds32_r2, err);
+	__put_user_error(regs->uregs[3], &sf->uc.uc_mcontext.nds32_r3, err);
+	__put_user_error(regs->uregs[4], &sf->uc.uc_mcontext.nds32_r4, err);
+	__put_user_error(regs->uregs[5], &sf->uc.uc_mcontext.nds32_r5, err);
+	__put_user_error(regs->uregs[6], &sf->uc.uc_mcontext.nds32_r6, err);
+	__put_user_error(regs->uregs[7], &sf->uc.uc_mcontext.nds32_r7, err);
+	__put_user_error(regs->uregs[8], &sf->uc.uc_mcontext.nds32_r8, err);
+	__put_user_error(regs->uregs[9], &sf->uc.uc_mcontext.nds32_r9, err);
+	__put_user_error(regs->uregs[10], &sf->uc.uc_mcontext.nds32_r10, err);
+	__put_user_error(regs->uregs[11], &sf->uc.uc_mcontext.nds32_r11, err);
+	__put_user_error(regs->uregs[12], &sf->uc.uc_mcontext.nds32_r12, err);
+	__put_user_error(regs->uregs[13], &sf->uc.uc_mcontext.nds32_r13, err);
+	__put_user_error(regs->uregs[14], &sf->uc.uc_mcontext.nds32_r14, err);
+	__put_user_error(regs->uregs[15], &sf->uc.uc_mcontext.nds32_r15, err);
+	__put_user_error(regs->uregs[16], &sf->uc.uc_mcontext.nds32_r16, err);
+	__put_user_error(regs->uregs[17], &sf->uc.uc_mcontext.nds32_r17, err);
+	__put_user_error(regs->uregs[18], &sf->uc.uc_mcontext.nds32_r18, err);
+	__put_user_error(regs->uregs[19], &sf->uc.uc_mcontext.nds32_r19, err);
+	__put_user_error(regs->uregs[20], &sf->uc.uc_mcontext.nds32_r20, err);
+
+	__put_user_error(regs->uregs[21], &sf->uc.uc_mcontext.nds32_r21, err);
+	__put_user_error(regs->uregs[22], &sf->uc.uc_mcontext.nds32_r22, err);
+	__put_user_error(regs->uregs[23], &sf->uc.uc_mcontext.nds32_r23, err);
+	__put_user_error(regs->uregs[24], &sf->uc.uc_mcontext.nds32_r24, err);
+	__put_user_error(regs->uregs[25], &sf->uc.uc_mcontext.nds32_r25, err);
+	__put_user_error(regs->fp, &sf->uc.uc_mcontext.nds32_fp, err);
+	__put_user_error(regs->gp, &sf->uc.uc_mcontext.nds32_gp, err);
+	__put_user_error(regs->lp, &sf->uc.uc_mcontext.nds32_lp, err);
+	__put_user_error(regs->sp, &sf->uc.uc_mcontext.nds32_sp, err);
+	__put_user_error(regs->ipc, &sf->uc.uc_mcontext.nds32_ipc, err);
+#if defined(CONFIG_HWZOL)
+	__put_user_error(regs->lc, &sf->uc.uc_mcontext.zol.nds32_lc, err);
+	__put_user_error(regs->le, &sf->uc.uc_mcontext.zol.nds32_le, err);
+	__put_user_error(regs->lb, &sf->uc.uc_mcontext.zol.nds32_lb, err);
+#endif
+
+	__put_user_error(current->thread.trap_no, &sf->uc.uc_mcontext.trap_no,
+			 err);
+	__put_user_error(current->thread.error_code,
+			 &sf->uc.uc_mcontext.error_code, err);
+	__put_user_error(current->thread.address,
+			 &sf->uc.uc_mcontext.fault_address, err);
+	__put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err);
+
+	err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(*set));
+
+	return err;
+}
+
+static inline void __user *get_sigframe(struct ksignal *ksig,
+					struct pt_regs *regs, int framesize)
+{
+	unsigned long sp;
+
+	/* Default to using normal stack */
+	sp = regs->sp;
+
+	/*
+	 * If we are on the alternate signal stack and would overflow it, don't.
+	 * Return an always-bogus address instead so we will die with SIGSEGV.
+	 */
+	if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
+		return (void __user __force *)(-1UL);
+
+	/* This is the X/Open sanctioned signal stack switching. */
+	sp = (sigsp(sp, ksig) - framesize);
+
+	/*
+	 * nds32 mandates 8-byte alignment
+	 */
+	sp &= ~0x7UL;
+
+	return (void __user *)sp;
+}
+
+static int
+setup_return(struct pt_regs *regs, struct ksignal *ksig, void __user * frame)
+{
+	unsigned long handler = (unsigned long)ksig->ka.sa.sa_handler;
+	unsigned long retcode;
+
+	retcode = VDSO_SYMBOL(current->mm->context.vdso, rt_sigtramp);
+	regs->uregs[0] = ksig->sig;
+	regs->sp = (unsigned long)frame;
+	regs->lp = retcode;
+	regs->ipc = handler;
+
+	return 0;
+}
+
+static int
+setup_rt_frame(struct ksignal *ksig, sigset_t * set, struct pt_regs *regs)
+{
+	struct rt_sigframe __user *frame =
+	    get_sigframe(ksig, regs, sizeof(*frame));
+	int err = 0;
+
+	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+		return -EFAULT;
+
+	__put_user_error(0, &frame->uc.uc_flags, err);
+	__put_user_error(NULL, &frame->uc.uc_link, err);
+
+	err |= __save_altstack(&frame->uc.uc_stack, regs->sp);
+	err |= setup_sigframe(frame, regs, set);
+	if (err == 0) {
+		setup_return(regs, ksig, frame);
+		if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
+			err |= copy_siginfo_to_user(&frame->info, &ksig->info);
+			regs->uregs[1] = (unsigned long)&frame->info;
+			regs->uregs[2] = (unsigned long)&frame->uc;
+		}
+	}
+	return err;
+}
+
+/*
+ * OK, we're invoking a handler
+ */
+static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
+{
+	int ret;
+	sigset_t *oldset = sigmask_to_save();
+
+	if (in_syscall(regs)) {
+		/* Avoid additional syscall restarting via ret_slow_syscall. */
+		forget_syscall(regs);
+
+		switch (regs->uregs[0]) {
+		case -ERESTART_RESTARTBLOCK:
+		case -ERESTARTNOHAND:
+			regs->uregs[0] = -EINTR;
+			break;
+		case -ERESTARTSYS:
+			if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
+				regs->uregs[0] = -EINTR;
+				break;
+			}
+		case -ERESTARTNOINTR:
+			regs->uregs[0] = regs->orig_r0;
+			regs->ipc -= 4;
+			break;
+		}
+	}
+	/*
+	 * Set up the stack frame
+	 */
+	ret = setup_rt_frame(ksig, oldset, regs);
+
+	signal_setup_done(ret, ksig, 0);
+}
+
+/*
+ * Note that 'init' is a special process: it doesn't get signals it doesn't
+ * want to handle. Thus you cannot kill init even with a SIGKILL even by
+ * mistake.
+ *
+ * Note that we go through the signals twice: once to check the signals that
+ * the kernel can handle, and then we build all the user-level signal handling
+ * stack-frames in one go after that.
+ */
+static void do_signal(struct pt_regs *regs)
+{
+	struct ksignal ksig;
+
+	if (get_signal(&ksig)) {
+		handle_signal(&ksig, regs);
+		return;
+	}
+
+	/*
+	 * If we were from a system call, check for system call restarting...
+	 */
+	if (in_syscall(regs)) {
+		/* Restart the system call - no handlers present */
+
+		/* Avoid additional syscall restarting via ret_slow_syscall. */
+		forget_syscall(regs);
+
+		switch (regs->uregs[0]) {
+		case -ERESTART_RESTARTBLOCK:
+			regs->uregs[15] = __NR_restart_syscall;
+		case -ERESTARTNOHAND:
+		case -ERESTARTSYS:
+		case -ERESTARTNOINTR:
+			regs->uregs[0] = regs->orig_r0;
+			regs->ipc -= 0x4;
+			break;
+		}
+	}
+	restore_saved_sigmask();
+}
+
+asmlinkage void
+do_notify_resume(struct pt_regs *regs, unsigned int thread_flags)
+{
+	if (thread_flags & _TIF_SIGPENDING)
+		do_signal(regs);
+
+	if (thread_flags & _TIF_NOTIFY_RESUME) {
+		clear_thread_flag(TIF_NOTIFY_RESUME);
+		tracehook_notify_resume(regs);
+	}
+}
diff --git a/arch/nds32/kernel/stacktrace.c b/arch/nds32/kernel/stacktrace.c
new file mode 100644
index 0000000..bc70113
--- /dev/null
+++ b/arch/nds32/kernel/stacktrace.c
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/sched/debug.h>
+#include <linux/sched/task_stack.h>
+#include <linux/stacktrace.h>
+
+void save_stack_trace(struct stack_trace *trace)
+{
+	save_stack_trace_tsk(current, trace);
+}
+
+void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+{
+	unsigned long *fpn;
+	int skip = trace->skip;
+	int savesched;
+
+	if (tsk == current) {
+		__asm__ __volatile__("\tori\t%0, $fp, #0\n":"=r"(fpn));
+		savesched = 1;
+	} else {
+		fpn = (unsigned long *)thread_saved_fp(tsk);
+		savesched = 0;
+	}
+
+	while (!kstack_end(fpn) && !((unsigned long)fpn & 0x3)
+	       && (fpn >= (unsigned long *)TASK_SIZE)) {
+		unsigned long lpp, fpp;
+
+		lpp = fpn[-1];
+		fpp = fpn[FP_OFFSET];
+		if (!__kernel_text_address(lpp))
+			break;
+
+		if (savesched || !in_sched_functions(lpp)) {
+			if (skip) {
+				skip--;
+			} else {
+				trace->entries[trace->nr_entries++] = lpp;
+				if (trace->nr_entries >= trace->max_entries)
+					break;
+			}
+		}
+		fpn = (unsigned long *)fpp;
+	}
+}
diff --git a/arch/nds32/kernel/sys_nds32.c b/arch/nds32/kernel/sys_nds32.c
new file mode 100644
index 0000000..9de93ab
--- /dev/null
+++ b/arch/nds32/kernel/sys_nds32.c
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/syscalls.h>
+#include <linux/uaccess.h>
+
+#include <asm/cachectl.h>
+#include <asm/proc-fns.h>
+
+SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
+	       unsigned long, prot, unsigned long, flags,
+	       unsigned long, fd, unsigned long, pgoff)
+{
+	if (pgoff & (~PAGE_MASK >> 12))
+		return -EINVAL;
+
+	return sys_mmap_pgoff(addr, len, prot, flags, fd,
+			      pgoff >> (PAGE_SHIFT - 12));
+}
+
+SYSCALL_DEFINE4(fadvise64_64_wrapper,int, fd, int, advice, loff_t, offset,
+					 loff_t, len)
+{
+	return sys_fadvise64_64(fd, offset, len, advice);
+}
+
+SYSCALL_DEFINE3(cacheflush, unsigned int, start, unsigned int, end, int, cache)
+{
+	struct vm_area_struct *vma;
+	bool flushi = true, wbd = true;
+
+	vma = find_vma(current->mm, start);
+	if (!vma)
+		return -EFAULT;
+	switch (cache) {
+	case ICACHE:
+		wbd = false;
+		break;
+	case DCACHE:
+		flushi = false;
+		break;
+	case BCACHE:
+		break;
+	default:
+		return -EINVAL;
+	}
+	cpu_cache_wbinval_range_check(vma, start, end, flushi, wbd);
+
+	return 0;
+}
diff --git a/arch/nds32/kernel/syscall_table.c b/arch/nds32/kernel/syscall_table.c
new file mode 100644
index 0000000..7879c06
--- /dev/null
+++ b/arch/nds32/kernel/syscall_table.c
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/syscalls.h>
+#include <linux/signal.h>
+#include <linux/unistd.h>
+#include <asm/syscalls.h>
+
+#undef __SYSCALL
+#define __SYSCALL(nr, call) [nr] = (call),
+
+#define sys_rt_sigreturn sys_rt_sigreturn_wrapper
+#define sys_fadvise64_64 sys_fadvise64_64_wrapper
+void *sys_call_table[__NR_syscalls] __aligned(8192) = {
+	[0 ... __NR_syscalls - 1] = sys_ni_syscall,
+#include <asm/unistd.h>
+};
diff --git a/arch/nds32/kernel/time.c b/arch/nds32/kernel/time.c
new file mode 100644
index 0000000..ac9d78c
--- /dev/null
+++ b/arch/nds32/kernel/time.c
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/clocksource.h>
+#include <linux/clk-provider.h>
+
+void __init time_init(void)
+{
+	of_clk_init(NULL);
+	timer_probe();
+}
diff --git a/arch/nds32/kernel/traps.c b/arch/nds32/kernel/traps.c
new file mode 100644
index 0000000..6e34eb9
--- /dev/null
+++ b/arch/nds32/kernel/traps.c
@@ -0,0 +1,430 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/module.h>
+#include <linux/personality.h>
+#include <linux/kallsyms.h>
+#include <linux/hardirq.h>
+#include <linux/kdebug.h>
+#include <linux/sched/task_stack.h>
+#include <linux/uaccess.h>
+
+#include <asm/proc-fns.h>
+#include <asm/unistd.h>
+
+#include <linux/ptrace.h>
+#include <nds32_intrinsic.h>
+
+extern void show_pte(struct mm_struct *mm, unsigned long addr);
+
+/*
+ * Dump out the contents of some memory nicely...
+ */
+void dump_mem(const char *lvl, unsigned long bottom, unsigned long top)
+{
+	unsigned long first;
+	mm_segment_t fs;
+	int i;
+
+	/*
+	 * We need to switch to kernel mode so that we can use __get_user
+	 * to safely read from kernel space.  Note that we now dump the
+	 * code first, just in case the backtrace kills us.
+	 */
+	fs = get_fs();
+	set_fs(KERNEL_DS);
+
+	pr_emerg("%s(0x%08lx to 0x%08lx)\n", lvl, bottom, top);
+
+	for (first = bottom & ~31; first < top; first += 32) {
+		unsigned long p;
+		char str[sizeof(" 12345678") * 8 + 1];
+
+		memset(str, ' ', sizeof(str));
+		str[sizeof(str) - 1] = '\0';
+
+		for (p = first, i = 0; i < 8 && p < top; i++, p += 4) {
+			if (p >= bottom && p < top) {
+				unsigned long val;
+				if (__get_user(val, (unsigned long *)p) == 0)
+					sprintf(str + i * 9, " %08lx", val);
+				else
+					sprintf(str + i * 9, " ????????");
+			}
+		}
+		pr_emerg("%s%04lx:%s\n", lvl, first & 0xffff, str);
+	}
+
+	set_fs(fs);
+}
+
+EXPORT_SYMBOL(dump_mem);
+
+static void dump_instr(struct pt_regs *regs)
+{
+	unsigned long addr = instruction_pointer(regs);
+	mm_segment_t fs;
+	char str[sizeof("00000000 ") * 5 + 2 + 1], *p = str;
+	int i;
+
+	return;
+	/*
+	 * We need to switch to kernel mode so that we can use __get_user
+	 * to safely read from kernel space.  Note that we now dump the
+	 * code first, just in case the backtrace kills us.
+	 */
+	fs = get_fs();
+	set_fs(KERNEL_DS);
+
+	pr_emerg("Code: ");
+	for (i = -4; i < 1; i++) {
+		unsigned int val, bad;
+
+		bad = __get_user(val, &((u32 *) addr)[i]);
+
+		if (!bad) {
+			p += sprintf(p, i == 0 ? "(%08x) " : "%08x ", val);
+		} else {
+			p += sprintf(p, "bad PC value");
+			break;
+		}
+	}
+	pr_emerg("Code: %s\n", str);
+
+	set_fs(fs);
+}
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+#include <linux/ftrace.h>
+static void
+get_real_ret_addr(unsigned long *addr, struct task_struct *tsk, int *graph)
+{
+	if (*addr == (unsigned long)return_to_handler) {
+		int index = tsk->curr_ret_stack;
+
+		if (tsk->ret_stack && index >= *graph) {
+			index -= *graph;
+			*addr = tsk->ret_stack[index].ret;
+			(*graph)++;
+		}
+	}
+}
+#else
+static inline void
+get_real_ret_addr(unsigned long *addr, struct task_struct *tsk, int *graph)
+{
+}
+#endif
+
+#define LOOP_TIMES (100)
+static void __dump(struct task_struct *tsk, unsigned long *base_reg)
+{
+	unsigned long ret_addr;
+	int cnt = LOOP_TIMES, graph = 0;
+	pr_emerg("Call Trace:\n");
+	if (!IS_ENABLED(CONFIG_FRAME_POINTER)) {
+		while (!kstack_end(base_reg)) {
+			ret_addr = *base_reg++;
+			if (__kernel_text_address(ret_addr)) {
+				get_real_ret_addr(&ret_addr, tsk, &graph);
+				print_ip_sym(ret_addr);
+			}
+			if (--cnt < 0)
+				break;
+		}
+	} else {
+		while (!kstack_end((void *)base_reg) &&
+		       !((unsigned long)base_reg & 0x3) &&
+		       ((unsigned long)base_reg >= TASK_SIZE)) {
+			unsigned long next_fp;
+#if !defined(NDS32_ABI_2)
+			ret_addr = base_reg[0];
+			next_fp = base_reg[1];
+#else
+			ret_addr = base_reg[-1];
+			next_fp = base_reg[FP_OFFSET];
+#endif
+			if (__kernel_text_address(ret_addr)) {
+				get_real_ret_addr(&ret_addr, tsk, &graph);
+				print_ip_sym(ret_addr);
+			}
+			if (--cnt < 0)
+				break;
+			base_reg = (unsigned long *)next_fp;
+		}
+	}
+	pr_emerg("\n");
+}
+
+void show_stack(struct task_struct *tsk, unsigned long *sp)
+{
+	unsigned long *base_reg;
+
+	if (!tsk)
+		tsk = current;
+	if (!IS_ENABLED(CONFIG_FRAME_POINTER)) {
+		if (tsk != current)
+			base_reg = (unsigned long *)(tsk->thread.cpu_context.sp);
+		else
+			__asm__ __volatile__("\tori\t%0, $sp, #0\n":"=r"(base_reg));
+	} else {
+		if (tsk != current)
+			base_reg = (unsigned long *)(tsk->thread.cpu_context.fp);
+		else
+			__asm__ __volatile__("\tori\t%0, $fp, #0\n":"=r"(base_reg));
+	}
+	__dump(tsk, base_reg);
+	barrier();
+}
+
+DEFINE_SPINLOCK(die_lock);
+
+/*
+ * This function is protected against re-entrancy.
+ */
+void die(const char *str, struct pt_regs *regs, int err)
+{
+	struct task_struct *tsk = current;
+	static int die_counter;
+
+	console_verbose();
+	spin_lock_irq(&die_lock);
+	bust_spinlocks(1);
+
+	pr_emerg("Internal error: %s: %x [#%d]\n", str, err, ++die_counter);
+	print_modules();
+	pr_emerg("CPU: %i\n", smp_processor_id());
+	show_regs(regs);
+	pr_emerg("Process %s (pid: %d, stack limit = 0x%p)\n",
+		 tsk->comm, tsk->pid, task_thread_info(tsk) + 1);
+
+	if (!user_mode(regs) || in_interrupt()) {
+		dump_mem("Stack: ", regs->sp,
+			 THREAD_SIZE + (unsigned long)task_thread_info(tsk));
+		dump_instr(regs);
+		dump_stack();
+	}
+
+	bust_spinlocks(0);
+	spin_unlock_irq(&die_lock);
+	do_exit(SIGSEGV);
+}
+
+EXPORT_SYMBOL(die);
+
+void die_if_kernel(const char *str, struct pt_regs *regs, int err)
+{
+	if (user_mode(regs))
+		return;
+
+	die(str, regs, err);
+}
+
+int bad_syscall(int n, struct pt_regs *regs)
+{
+	siginfo_t info;
+
+	if (current->personality != PER_LINUX) {
+		send_sig(SIGSEGV, current, 1);
+		return regs->uregs[0];
+	}
+
+	info.si_signo = SIGILL;
+	info.si_errno = 0;
+	info.si_code = ILL_ILLTRP;
+	info.si_addr = (void __user *)instruction_pointer(regs) - 4;
+
+	force_sig_info(SIGILL, &info, current);
+	die_if_kernel("Oops - bad syscall", regs, n);
+	return regs->uregs[0];
+}
+
+void __pte_error(const char *file, int line, unsigned long val)
+{
+	pr_emerg("%s:%d: bad pte %08lx.\n", file, line, val);
+}
+
+void __pmd_error(const char *file, int line, unsigned long val)
+{
+	pr_emerg("%s:%d: bad pmd %08lx.\n", file, line, val);
+}
+
+void __pgd_error(const char *file, int line, unsigned long val)
+{
+	pr_emerg("%s:%d: bad pgd %08lx.\n", file, line, val);
+}
+
+extern char *exception_vector, *exception_vector_end;
+void __init trap_init(void)
+{
+	return;
+}
+
+void __init early_trap_init(void)
+{
+	unsigned long ivb = 0;
+	unsigned long base = PAGE_OFFSET;
+
+	memcpy((unsigned long *)base, (unsigned long *)&exception_vector,
+	       ((unsigned long)&exception_vector_end -
+		(unsigned long)&exception_vector));
+	ivb = __nds32__mfsr(NDS32_SR_IVB);
+	/* Check platform support. */
+	if (((ivb & IVB_mskNIVIC) >> IVB_offNIVIC) < 2)
+		panic
+		    ("IVIC mode is not allowed on the platform with interrupt controller\n");
+	__nds32__mtsr((ivb & ~IVB_mskESZ) | (IVB_valESZ16 << IVB_offESZ) |
+		      IVB_BASE, NDS32_SR_IVB);
+	__nds32__mtsr(INT_MASK_INITAIAL_VAL, NDS32_SR_INT_MASK);
+
+	/*
+	 * 0x800 = 128 vectors * 16byte.
+	 * It should be enough to flush a page.
+	 */
+	cpu_cache_wbinval_page(base, true);
+}
+
+void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
+		  int error_code, int si_code)
+{
+	struct siginfo info;
+
+	tsk->thread.trap_no = ENTRY_DEBUG_RELATED;
+	tsk->thread.error_code = error_code;
+
+	memset(&info, 0, sizeof(info));
+	info.si_signo = SIGTRAP;
+	info.si_code = si_code;
+	info.si_addr = (void __user *)instruction_pointer(regs);
+	force_sig_info(SIGTRAP, &info, tsk);
+}
+
+void do_debug_trap(unsigned long entry, unsigned long addr,
+		   unsigned long type, struct pt_regs *regs)
+{
+	if (notify_die(DIE_OOPS, "Oops", regs, addr, type, SIGTRAP)
+	    == NOTIFY_STOP)
+		return;
+
+	if (user_mode(regs)) {
+		/* trap_signal */
+		send_sigtrap(current, regs, 0, TRAP_BRKPT);
+	} else {
+		/* kernel_trap */
+		if (!fixup_exception(regs))
+			die("unexpected kernel_trap", regs, 0);
+	}
+}
+
+void unhandled_interruption(struct pt_regs *regs)
+{
+	siginfo_t si;
+	pr_emerg("unhandled_interruption\n");
+	show_regs(regs);
+	if (!user_mode(regs))
+		do_exit(SIGKILL);
+	si.si_signo = SIGKILL;
+	si.si_errno = 0;
+	force_sig_info(SIGKILL, &si, current);
+}
+
+void unhandled_exceptions(unsigned long entry, unsigned long addr,
+			  unsigned long type, struct pt_regs *regs)
+{
+	siginfo_t si;
+	pr_emerg("Unhandled Exception: entry: %lx addr:%lx itype:%lx\n", entry,
+		 addr, type);
+	show_regs(regs);
+	if (!user_mode(regs))
+		do_exit(SIGKILL);
+	si.si_signo = SIGKILL;
+	si.si_errno = 0;
+	si.si_addr = (void *)addr;
+	force_sig_info(SIGKILL, &si, current);
+}
+
+extern int do_page_fault(unsigned long entry, unsigned long addr,
+			 unsigned int error_code, struct pt_regs *regs);
+
+/*
+ * 2:DEF dispatch for TLB MISC exception handler
+*/
+
+void do_dispatch_tlb_misc(unsigned long entry, unsigned long addr,
+			  unsigned long type, struct pt_regs *regs)
+{
+	type = type & (ITYPE_mskINST | ITYPE_mskETYPE);
+	if ((type & ITYPE_mskETYPE) < 5) {
+		/* Permission exceptions */
+		do_page_fault(entry, addr, type, regs);
+	} else
+		unhandled_exceptions(entry, addr, type, regs);
+}
+
+void do_revinsn(struct pt_regs *regs)
+{
+	siginfo_t si;
+	pr_emerg("Reserved Instruction\n");
+	show_regs(regs);
+	if (!user_mode(regs))
+		do_exit(SIGILL);
+	si.si_signo = SIGILL;
+	si.si_errno = 0;
+	force_sig_info(SIGILL, &si, current);
+}
+
+#ifdef CONFIG_ALIGNMENT_TRAP
+extern int unalign_access_mode;
+extern int do_unaligned_access(unsigned long addr, struct pt_regs *regs);
+#endif
+void do_dispatch_general(unsigned long entry, unsigned long addr,
+			 unsigned long itype, struct pt_regs *regs,
+			 unsigned long oipc)
+{
+	unsigned int swid = itype >> ITYPE_offSWID;
+	unsigned long type = itype & (ITYPE_mskINST | ITYPE_mskETYPE);
+	if (type == ETYPE_ALIGNMENT_CHECK) {
+#ifdef CONFIG_ALIGNMENT_TRAP
+		/* Alignment check */
+		if (user_mode(regs) && unalign_access_mode) {
+			int ret;
+			ret = do_unaligned_access(addr, regs);
+
+			if (ret == 0)
+				return;
+
+			if (ret == -EFAULT)
+				pr_emerg
+				    ("Unhandled unaligned access exception\n");
+		}
+#endif
+		do_page_fault(entry, addr, type, regs);
+	} else if (type == ETYPE_RESERVED_INSTRUCTION) {
+		/* Reserved instruction */
+		do_revinsn(regs);
+	} else if (type == ETYPE_TRAP && swid == SWID_RAISE_INTERRUPT_LEVEL) {
+		/* trap, used on v3 EDM target debugging workaround */
+		/*
+		 * DIPC(OIPC) is passed as parameter before
+		 * interrupt is enabled, so the DIPC will not be corrupted
+		 * even though interrupts are coming in
+		 */
+		/*
+		 * 1. update ipc
+		 * 2. update pt_regs ipc with oipc
+		 * 3. update pt_regs ipsw (clear DEX)
+		 */
+		__asm__ volatile ("mtsr %0, $IPC\n\t"::"r" (oipc));
+		regs->ipc = oipc;
+		if (regs->pipsw & PSW_mskDEX) {
+			pr_emerg
+			    ("Nested Debug exception is possibly happened\n");
+			pr_emerg("ipc:%08x pipc:%08x\n",
+				 (unsigned int)regs->ipc,
+				 (unsigned int)regs->pipc);
+		}
+		do_debug_trap(entry, addr, itype, regs);
+		regs->ipsw &= ~PSW_mskDEX;
+	} else
+		unhandled_exceptions(entry, addr, type, regs);
+}
diff --git a/arch/nds32/kernel/vdso.c b/arch/nds32/kernel/vdso.c
new file mode 100644
index 0000000..f1198d7
--- /dev/null
+++ b/arch/nds32/kernel/vdso.c
@@ -0,0 +1,230 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2012 ARM Limited
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/cache.h>
+#include <linux/clocksource.h>
+#include <linux/elf.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/gfp.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/slab.h>
+#include <linux/timekeeper_internal.h>
+#include <linux/vmalloc.h>
+#include <linux/random.h>
+
+#include <asm/cacheflush.h>
+#include <asm/vdso.h>
+#include <asm/vdso_datapage.h>
+#include <asm/vdso_timer_info.h>
+#include <asm/cache_info.h>
+extern struct cache_info L1_cache_info[2];
+extern char vdso_start, vdso_end;
+static unsigned long vdso_pages __ro_after_init;
+static unsigned long timer_mapping_base;
+
+struct timer_info_t timer_info = {
+	.cycle_count_down = true,
+	.mapping_base = EMPTY_TIMER_MAPPING,
+	.cycle_count_reg_offset = EMPTY_REG_OFFSET
+};
+/*
+ * The vDSO data page.
+ */
+static struct page *no_pages[] = { NULL };
+
+static union {
+	struct vdso_data data;
+	u8 page[PAGE_SIZE];
+} vdso_data_store __page_aligned_data;
+struct vdso_data *vdso_data = &vdso_data_store.data;
+static struct vm_special_mapping vdso_spec[2] __ro_after_init = {
+	{
+	 .name = "[vvar]",
+	 .pages = no_pages,
+	 },
+	{
+	 .name = "[vdso]",
+	 },
+};
+
+static void get_timer_node_info(void)
+{
+	timer_mapping_base = timer_info.mapping_base;
+	vdso_data->cycle_count_offset =
+		timer_info.cycle_count_reg_offset;
+	vdso_data->cycle_count_down =
+		timer_info.cycle_count_down;
+}
+
+static int __init vdso_init(void)
+{
+	int i;
+	struct page **vdso_pagelist;
+
+	if (memcmp(&vdso_start, "\177ELF", 4)) {
+		pr_err("vDSO is not a valid ELF object!\n");
+		return -EINVAL;
+	}
+	/* Creat a timer io mapping to get clock cycles counter */
+	get_timer_node_info();
+
+	vdso_pages = (&vdso_end - &vdso_start) >> PAGE_SHIFT;
+	pr_info("vdso: %ld pages (%ld code @ %p, %ld data @ %p)\n",
+		vdso_pages + 1, vdso_pages, &vdso_start, 1L, vdso_data);
+
+	/* Allocate the vDSO pagelist */
+	vdso_pagelist = kcalloc(vdso_pages, sizeof(struct page *), GFP_KERNEL);
+	if (vdso_pagelist == NULL)
+		return -ENOMEM;
+
+	for (i = 0; i < vdso_pages; i++)
+		vdso_pagelist[i] = virt_to_page(&vdso_start + i * PAGE_SIZE);
+	vdso_spec[1].pages = &vdso_pagelist[0];
+
+	return 0;
+}
+
+arch_initcall(vdso_init);
+
+unsigned long inline vdso_random_addr(unsigned long vdso_mapping_len)
+{
+	unsigned long start = current->mm->mmap_base, end, offset, addr;
+	start = PAGE_ALIGN(start);
+
+	/* Round the lowest possible end address up to a PMD boundary. */
+	end = (start + vdso_mapping_len + PMD_SIZE - 1) & PMD_MASK;
+	if (end >= TASK_SIZE)
+		end = TASK_SIZE;
+	end -= vdso_mapping_len;
+
+	if (end > start) {
+		offset = get_random_int() % (((end - start) >> PAGE_SHIFT) + 1);
+		addr = start + (offset << PAGE_SHIFT);
+	} else {
+		addr = start;
+	}
+	return addr;
+}
+
+int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
+{
+	struct mm_struct *mm = current->mm;
+	unsigned long vdso_base, vdso_text_len, vdso_mapping_len;
+	struct vm_area_struct *vma;
+	unsigned long addr = 0;
+	pgprot_t prot;
+	int ret, vvar_page_num = 2;
+
+	vdso_text_len = vdso_pages << PAGE_SHIFT;
+
+	if(timer_mapping_base == EMPTY_VALUE)
+		vvar_page_num = 1;
+	/* Be sure to map the data page */
+	vdso_mapping_len = vdso_text_len + vvar_page_num * PAGE_SIZE;
+#ifdef CONFIG_CPU_CACHE_ALIASING
+	vdso_mapping_len += L1_cache_info[DCACHE].aliasing_num - 1;
+#endif
+
+	if (down_write_killable(&mm->mmap_sem))
+		return -EINTR;
+
+	addr = vdso_random_addr(vdso_mapping_len);
+	vdso_base = get_unmapped_area(NULL, addr, vdso_mapping_len, 0, 0);
+	if (IS_ERR_VALUE(vdso_base)) {
+		ret = vdso_base;
+		goto up_fail;
+	}
+
+#ifdef CONFIG_CPU_CACHE_ALIASING
+	{
+		unsigned int aliasing_mask =
+		    L1_cache_info[DCACHE].aliasing_mask;
+		unsigned int page_colour_ofs;
+		page_colour_ofs = ((unsigned int)vdso_data & aliasing_mask) -
+		    (vdso_base & aliasing_mask);
+		vdso_base += page_colour_ofs & aliasing_mask;
+	}
+#endif
+
+	vma = _install_special_mapping(mm, vdso_base, vvar_page_num * PAGE_SIZE,
+				       VM_READ | VM_MAYREAD, &vdso_spec[0]);
+	if (IS_ERR(vma)) {
+		ret = PTR_ERR(vma);
+		goto up_fail;
+	}
+
+	/*Map vdata to user space */
+	ret = io_remap_pfn_range(vma, vdso_base,
+				 virt_to_phys(vdso_data) >> PAGE_SHIFT,
+				 PAGE_SIZE, vma->vm_page_prot);
+	if (ret)
+		goto up_fail;
+
+	/*Map timer to user space */
+	vdso_base += PAGE_SIZE;
+	prot = __pgprot(_PAGE_V | _PAGE_M_UR_KR | _PAGE_D |  _PAGE_C_DEV);
+	ret = io_remap_pfn_range(vma, vdso_base, timer_mapping_base >> PAGE_SHIFT,
+				 PAGE_SIZE, prot);
+	if (ret)
+		goto up_fail;
+
+	/*Map vdso to user space */
+	vdso_base += PAGE_SIZE;
+	mm->context.vdso = (void *)vdso_base;
+	vma = _install_special_mapping(mm, vdso_base, vdso_text_len,
+				       VM_READ | VM_EXEC |
+				       VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC,
+				       &vdso_spec[1]);
+	if (IS_ERR(vma)) {
+		ret = PTR_ERR(vma);
+		goto up_fail;
+	}
+
+	up_write(&mm->mmap_sem);
+	return 0;
+
+up_fail:
+	mm->context.vdso = NULL;
+	up_write(&mm->mmap_sem);
+	return ret;
+}
+
+static void vdso_write_begin(struct vdso_data *vdata)
+{
+	++vdso_data->seq_count;
+	smp_wmb();		/* Pairs with smp_rmb in vdso_read_retry */
+}
+
+static void vdso_write_end(struct vdso_data *vdata)
+{
+	smp_wmb();		/* Pairs with smp_rmb in vdso_read_begin */
+	++vdso_data->seq_count;
+}
+
+void update_vsyscall(struct timekeeper *tk)
+{
+	vdso_write_begin(vdso_data);
+	vdso_data->cs_mask = tk->tkr_mono.mask;
+	vdso_data->cs_mult = tk->tkr_mono.mult;
+	vdso_data->cs_shift = tk->tkr_mono.shift;
+	vdso_data->cs_cycle_last = tk->tkr_mono.cycle_last;
+	vdso_data->wtm_clock_sec = tk->wall_to_monotonic.tv_sec;
+	vdso_data->wtm_clock_nsec = tk->wall_to_monotonic.tv_nsec;
+	vdso_data->xtime_clock_sec = tk->xtime_sec;
+	vdso_data->xtime_clock_nsec = tk->tkr_mono.xtime_nsec;
+	vdso_data->xtime_coarse_sec = tk->xtime_sec;
+	vdso_data->xtime_coarse_nsec = tk->tkr_mono.xtime_nsec >>
+	    tk->tkr_mono.shift;
+	vdso_write_end(vdso_data);
+}
+
+void update_vsyscall_tz(void)
+{
+	vdso_data->tz_minuteswest = sys_tz.tz_minuteswest;
+	vdso_data->tz_dsttime = sys_tz.tz_dsttime;
+}
diff --git a/arch/nds32/kernel/vdso/Makefile b/arch/nds32/kernel/vdso/Makefile
new file mode 100644
index 0000000..e6c50a7
--- /dev/null
+++ b/arch/nds32/kernel/vdso/Makefile
@@ -0,0 +1,82 @@
+#
+# Building a vDSO image for AArch64.
+#
+# Author: Will Deacon <will.deacon@arm.com>
+# Heavily based on the vDSO Makefiles for other archs.
+#
+
+obj-vdso := note.o datapage.o sigreturn.o gettimeofday.o
+
+# Build rules
+targets := $(obj-vdso) vdso.so vdso.so.dbg
+obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
+
+ccflags-y := -shared -fno-common -fno-builtin
+ccflags-y += -nostdlib -Wl,-soname=linux-vdso.so.1 \
+		$(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
+ccflags-y += -fPIC -Wl,-shared -g
+
+# Disable gcov profiling for VDSO code
+GCOV_PROFILE := n
+
+
+obj-y += vdso.o
+extra-y += vdso.lds
+CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
+
+# Force dependency
+$(obj)/vdso.o : $(obj)/vdso.so
+
+# Link rule for the .so file, .lds has to be first
+$(obj)/vdso.so.dbg: $(src)/vdso.lds $(obj-vdso)
+	$(call if_changed,vdsold)
+
+
+# Strip rule for the .so file
+$(obj)/%.so: OBJCOPYFLAGS := -S
+$(obj)/%.so: $(obj)/%.so.dbg FORCE
+	$(call if_changed,objcopy)
+
+# Generate VDSO offsets using helper script
+gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
+quiet_cmd_vdsosym = VDSOSYM $@
+define cmd_vdsosym
+	$(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
+endef
+
+include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE
+	$(call if_changed,vdsosym)
+
+
+
+# Assembly rules for the .S files
+
+sigreturn.o : sigreturn.S
+	$(call if_changed_dep,vdsoas)
+
+note.o : note.S
+	$(call if_changed_dep,vdsoas)
+
+datapage.o : datapage.S
+	$(call if_changed_dep,vdsoas)
+
+gettimeofday.o : gettimeofday.c FORCE
+	$(call if_changed_dep,vdsocc)
+
+# Actual build commands
+quiet_cmd_vdsold = VDSOL   $@
+      cmd_vdsold = $(CC) $(c_flags) -Wl,-n -Wl,-T $^ -o $@
+quiet_cmd_vdsoas = VDSOA   $@
+      cmd_vdsoas = $(CC) $(a_flags) -c -o $@ $<
+quiet_cmd_vdsocc = VDSOA   $@
+      cmd_vdsocc = $(CC) $(c_flags) -c -o $@ $<
+
+# Install commands for the unstripped file
+quiet_cmd_vdso_install = INSTALL $@
+      cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
+
+vdso.so: $(obj)/vdso.so.dbg
+	@mkdir -p $(MODLIB)/vdso
+	$(call cmd,vdso_install)
+
+vdso_install: vdso.so
diff --git a/arch/nds32/kernel/vdso/datapage.S b/arch/nds32/kernel/vdso/datapage.S
new file mode 100644
index 0000000..4a62c3c
--- /dev/null
+++ b/arch/nds32/kernel/vdso/datapage.S
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+#include <asm/page.h>
+
+ENTRY(__get_timerpage)
+	sethi	$r0, hi20(. + PAGE_SIZE + 8)
+	ori	$r0, $r0, lo12(. + PAGE_SIZE + 4)
+	mfusr	$r1, $pc
+	sub	$r0, $r1, $r0
+	ret
+ENDPROC(__get_timerpage)
+
+ENTRY(__get_datapage)
+	sethi	$r0, hi20(. + 2*PAGE_SIZE + 8)
+	ori	$r0, $r0, lo12(. + 2*PAGE_SIZE + 4)
+	mfusr	$r1, $pc
+	sub	$r0, $r1, $r0
+	ret
+ENDPROC(__get_datapage)
diff --git a/arch/nds32/kernel/vdso/gen_vdso_offsets.sh b/arch/nds32/kernel/vdso/gen_vdso_offsets.sh
new file mode 100755
index 0000000..01924ff
--- /dev/null
+++ b/arch/nds32/kernel/vdso/gen_vdso_offsets.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+
+#
+# Match symbols in the DSO that look like VDSO_*; produce a header file
+# of constant offsets into the shared object.
+#
+# Doing this inside the Makefile will break the $(filter-out) function,
+# causing Kbuild to rebuild the vdso-offsets header file every time.
+#
+# Author: Will Deacon <will.deacon@arm.com
+#
+
+LC_ALL=C
+sed -n -e 's/^00*/0/' -e \
+'s/^\([0-9a-fA-F]*\) . VDSO_\([a-zA-Z0-9_]*\)$/\#define vdso_offset_\2\t0x\1/p'
diff --git a/arch/nds32/kernel/vdso/gettimeofday.c b/arch/nds32/kernel/vdso/gettimeofday.c
new file mode 100644
index 0000000..038721a
--- /dev/null
+++ b/arch/nds32/kernel/vdso/gettimeofday.c
@@ -0,0 +1,270 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/compiler.h>
+#include <linux/hrtimer.h>
+#include <linux/time.h>
+#include <asm/io.h>
+#include <asm/barrier.h>
+#include <asm/bug.h>
+#include <asm/page.h>
+#include <asm/unistd.h>
+#include <asm/vdso_datapage.h>
+#include <asm/vdso_timer_info.h>
+#include <asm/asm-offsets.h>
+
+#define X(x) #x
+#define Y(x) X(x)
+
+extern struct vdso_data *__get_datapage(void);
+extern struct vdso_data *__get_timerpage(void);
+
+static notrace unsigned int __vdso_read_begin(const struct vdso_data *vdata)
+{
+	u32 seq;
+repeat:
+	seq = READ_ONCE(vdata->seq_count);
+	if (seq & 1) {
+		cpu_relax();
+		goto repeat;
+	}
+	return seq;
+}
+
+static notrace unsigned int vdso_read_begin(const struct vdso_data *vdata)
+{
+	unsigned int seq;
+
+	seq = __vdso_read_begin(vdata);
+
+	smp_rmb();		/* Pairs with smp_wmb in vdso_write_end */
+	return seq;
+}
+
+static notrace int vdso_read_retry(const struct vdso_data *vdata, u32 start)
+{
+	smp_rmb();		/* Pairs with smp_wmb in vdso_write_begin */
+	return vdata->seq_count != start;
+}
+
+static notrace long clock_gettime_fallback(clockid_t _clkid,
+					   struct timespec *_ts)
+{
+	register struct timespec *ts asm("$r1") = _ts;
+	register clockid_t clkid asm("$r0") = _clkid;
+	register long ret asm("$r0");
+
+	asm volatile ("movi	$r15, %3\n"
+		      "syscall 	0x0\n"
+		      :"=r" (ret)
+		      :"r"(clkid), "r"(ts), "i"(__NR_clock_gettime)
+		      :"$r15", "memory");
+
+	return ret;
+}
+
+static notrace int do_realtime_coarse(struct timespec *ts,
+				      struct vdso_data *vdata)
+{
+	u32 seq;
+
+	do {
+		seq = vdso_read_begin(vdata);
+
+		ts->tv_sec = vdata->xtime_coarse_sec;
+		ts->tv_nsec = vdata->xtime_coarse_nsec;
+
+	} while (vdso_read_retry(vdata, seq));
+	return 0;
+}
+
+static notrace int do_monotonic_coarse(struct timespec *ts,
+				       struct vdso_data *vdata)
+{
+	struct timespec tomono;
+	u32 seq;
+
+	do {
+		seq = vdso_read_begin(vdata);
+
+		ts->tv_sec = vdata->xtime_coarse_sec;
+		ts->tv_nsec = vdata->xtime_coarse_nsec;
+
+		tomono.tv_sec = vdata->wtm_clock_sec;
+		tomono.tv_nsec = vdata->wtm_clock_nsec;
+
+	} while (vdso_read_retry(vdata, seq));
+
+	ts->tv_sec += tomono.tv_sec;
+	timespec_add_ns(ts, tomono.tv_nsec);
+	return 0;
+}
+
+static notrace inline u64 vgetsns(struct vdso_data *vdso)
+{
+	u32 cycle_now;
+	u32 cycle_delta;
+	u32 *timer_cycle_base;
+
+	timer_cycle_base =
+	    (u32 *) ((char *)__get_timerpage() + vdso->cycle_count_offset);
+	cycle_now = readl_relaxed(timer_cycle_base);
+	if (true == vdso->cycle_count_down)
+		cycle_now = ~(*timer_cycle_base);
+	cycle_delta = cycle_now - (u32) vdso->cs_cycle_last;
+	return ((u64) cycle_delta & vdso->cs_mask) * vdso->cs_mult;
+}
+
+static notrace int do_realtime(struct timespec *ts, struct vdso_data *vdata)
+{
+	unsigned count;
+	u64 ns;
+	do {
+		count = vdso_read_begin(vdata);
+		ts->tv_sec = vdata->xtime_clock_sec;
+		ns = vdata->xtime_clock_nsec;
+		ns += vgetsns(vdata);
+		ns >>= vdata->cs_shift;
+	} while (vdso_read_retry(vdata, count));
+
+	ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
+	ts->tv_nsec = ns;
+
+	return 0;
+}
+
+static notrace int do_monotonic(struct timespec *ts, struct vdso_data *vdata)
+{
+	struct timespec tomono;
+	u64 nsecs;
+	u32 seq;
+
+	do {
+		seq = vdso_read_begin(vdata);
+
+		ts->tv_sec = vdata->xtime_clock_sec;
+		nsecs = vdata->xtime_clock_nsec;
+		nsecs += vgetsns(vdata);
+		nsecs >>= vdata->cs_shift;
+
+		tomono.tv_sec = vdata->wtm_clock_sec;
+		tomono.tv_nsec = vdata->wtm_clock_nsec;
+
+	} while (vdso_read_retry(vdata, seq));
+
+	ts->tv_sec += tomono.tv_sec;
+	ts->tv_nsec = 0;
+	timespec_add_ns(ts, nsecs + tomono.tv_nsec);
+	return 0;
+}
+
+notrace int __vdso_clock_gettime(clockid_t clkid, struct timespec *ts)
+{
+	struct vdso_data *vdata;
+	int ret = -1;
+
+	vdata = __get_datapage();
+	if (vdata->cycle_count_offset == EMPTY_REG_OFFSET)
+		return clock_gettime_fallback(clkid, ts);
+
+	switch (clkid) {
+	case CLOCK_REALTIME_COARSE:
+		ret = do_realtime_coarse(ts, vdata);
+		break;
+	case CLOCK_MONOTONIC_COARSE:
+		ret = do_monotonic_coarse(ts, vdata);
+		break;
+	case CLOCK_REALTIME:
+		ret = do_realtime(ts, vdata);
+		break;
+	case CLOCK_MONOTONIC:
+		ret = do_monotonic(ts, vdata);
+		break;
+	default:
+		break;
+	}
+
+	if (ret)
+		ret = clock_gettime_fallback(clkid, ts);
+
+	return ret;
+}
+
+static notrace int clock_getres_fallback(clockid_t _clk_id,
+					  struct timespec *_res)
+{
+	register clockid_t clk_id asm("$r0") = _clk_id;
+	register struct timespec *res asm("$r1") = _res;
+	register int ret asm("$r0");
+
+	asm volatile ("movi	$r15, %3\n"
+		      "syscall	0x0\n"
+		      :"=r" (ret)
+		      :"r"(clk_id), "r"(res), "i"(__NR_clock_getres)
+		      :"$r15", "memory");
+
+	return ret;
+}
+
+notrace int __vdso_clock_getres(clockid_t clk_id, struct timespec *res)
+{
+	if (res == NULL)
+		return 0;
+	switch (clk_id) {
+	case CLOCK_REALTIME:
+	case CLOCK_MONOTONIC:
+	case CLOCK_MONOTONIC_RAW:
+		res->tv_sec = 0;
+		res->tv_nsec = CLOCK_REALTIME_RES;
+		break;
+	case CLOCK_REALTIME_COARSE:
+	case CLOCK_MONOTONIC_COARSE:
+		res->tv_sec = 0;
+		res->tv_nsec = CLOCK_COARSE_RES;
+		break;
+	default:
+		return clock_getres_fallback(clk_id, res);
+	}
+	return 0;
+}
+
+static notrace inline int gettimeofday_fallback(struct timeval *_tv,
+						struct timezone *_tz)
+{
+	register struct timeval *tv asm("$r0") = _tv;
+	register struct timezone *tz asm("$r1") = _tz;
+	register int ret asm("$r0");
+
+	asm volatile ("movi	$r15, %3\n"
+		      "syscall	0x0\n"
+		      :"=r" (ret)
+		      :"r"(tv), "r"(tz), "i"(__NR_gettimeofday)
+		      :"$r15", "memory");
+
+	return ret;
+}
+
+notrace int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
+{
+	struct timespec ts;
+	struct vdso_data *vdata;
+	int ret;
+
+	vdata = __get_datapage();
+
+	if (vdata->cycle_count_offset == EMPTY_REG_OFFSET)
+		return gettimeofday_fallback(tv, tz);
+
+	ret = do_realtime(&ts, vdata);
+
+	if (tv) {
+		tv->tv_sec = ts.tv_sec;
+		tv->tv_usec = ts.tv_nsec / 1000;
+	}
+	if (tz) {
+		tz->tz_minuteswest = vdata->tz_minuteswest;
+		tz->tz_dsttime = vdata->tz_dsttime;
+	}
+
+	return ret;
+}
diff --git a/arch/nds32/kernel/vdso/note.S b/arch/nds32/kernel/vdso/note.S
new file mode 100644
index 0000000..0aeaa19
--- /dev/null
+++ b/arch/nds32/kernel/vdso/note.S
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2012 ARM Limited
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/uts.h>
+#include <linux/version.h>
+#include <linux/elfnote.h>
+
+ELFNOTE_START(Linux, 0, "a")
+	.long LINUX_VERSION_CODE
+ELFNOTE_END
diff --git a/arch/nds32/kernel/vdso/sigreturn.S b/arch/nds32/kernel/vdso/sigreturn.S
new file mode 100644
index 0000000..67e4d1d
--- /dev/null
+++ b/arch/nds32/kernel/vdso/sigreturn.S
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2012 ARM Limited
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+#include <asm/unistd.h>
+
+	.text
+
+ENTRY(__kernel_rt_sigreturn)
+	.cfi_startproc
+	movi $r15, __NR_rt_sigreturn
+	/*
+	 * The SWID of syscall should be __NR_rt_sigreturn to synchronize
+	 * the unwinding scheme in gcc
+	 */
+	syscall	__NR_rt_sigreturn
+	.cfi_endproc
+ENDPROC(__kernel_rt_sigreturn)
diff --git a/arch/nds32/kernel/vdso/vdso.S b/arch/nds32/kernel/vdso/vdso.S
new file mode 100644
index 0000000..16737c1
--- /dev/null
+++ b/arch/nds32/kernel/vdso/vdso.S
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2012 ARM Limited
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <linux/const.h>
+#include <asm/page.h>
+
+	.globl vdso_start, vdso_end
+	.section .rodata
+	.balign PAGE_SIZE
+vdso_start:
+	.incbin "arch/nds32/kernel/vdso/vdso.so"
+	.balign PAGE_SIZE
+vdso_end:
+
+	.previous
diff --git a/arch/nds32/kernel/vdso/vdso.lds.S b/arch/nds32/kernel/vdso/vdso.lds.S
new file mode 100644
index 0000000..1f2b160
--- /dev/null
+++ b/arch/nds32/kernel/vdso/vdso.lds.S
@@ -0,0 +1,75 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0
+ * Copyright (C) 2005-2017 Andes Technology Corporation
+ */
+
+
+#include <linux/const.h>
+#include <asm/page.h>
+#include <asm/vdso.h>
+
+OUTPUT_ARCH(nds32)
+
+SECTIONS
+{
+	. = SIZEOF_HEADERS;
+
+	.hash		: { *(.hash) }			:text
+	.gnu.hash	: { *(.gnu.hash) }
+	.dynsym		: { *(.dynsym) }
+	.dynstr		: { *(.dynstr) }
+	.gnu.version	: { *(.gnu.version) }
+	.gnu.version_d	: { *(.gnu.version_d) }
+	.gnu.version_r	: { *(.gnu.version_r) }
+
+	.note		: { *(.note.*) }		:text	:note
+
+
+	.text		: { *(.text*) }			:text
+
+	.eh_frame_hdr	: { *(.eh_frame_hdr) }		:text	:eh_frame_hdr
+	.eh_frame	: { KEEP (*(.eh_frame)) }	:text
+
+	.dynamic	: { *(.dynamic) }		:text	:dynamic
+
+	.rodata		: { *(.rodata*) }		:text
+
+
+	/DISCARD/	: {
+		*(.note.GNU-stack)
+		*(.data .data.* .gnu.linkonce.d.* .sdata*)
+		*(.bss .sbss .dynbss .dynsbss)
+	}
+}
+
+/*
+ * We must supply the ELF program headers explicitly to get just one
+ * PT_LOAD segment, and set the flags explicitly to make segments read-only.
+ */
+PHDRS
+{
+	text		PT_LOAD		FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */
+	dynamic		PT_DYNAMIC	FLAGS(4);		/* PF_R */
+	note		PT_NOTE		FLAGS(4);		/* PF_R */
+	eh_frame_hdr	PT_GNU_EH_FRAME;
+}
+
+/*
+ * This controls what symbols we export from the DSO.
+ */
+VERSION
+{
+	LINUX_4 {
+	global:
+		__kernel_rt_sigreturn;
+		__vdso_gettimeofday;
+		__vdso_clock_getres;
+		__vdso_clock_gettime;
+	local: *;
+	};
+}
+
+/*
+ * Make the rt_sigreturn code visible to the kernel.
+ */
+VDSO_rt_sigtramp	= __kernel_rt_sigreturn;
diff --git a/arch/nds32/kernel/vmlinux.lds.S b/arch/nds32/kernel/vmlinux.lds.S
new file mode 100644
index 0000000..288313b
--- /dev/null
+++ b/arch/nds32/kernel/vmlinux.lds.S
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <asm/page.h>
+#include <asm/thread_info.h>
+#include <asm/cache.h>
+#include <asm/memory.h>
+
+#define LOAD_OFFSET	(PAGE_OFFSET - PHYS_OFFSET)
+#include <asm-generic/vmlinux.lds.h>
+
+OUTPUT_ARCH(nds32)
+ENTRY(_stext_lma)
+jiffies = jiffies_64;
+
+SECTIONS
+{
+	_stext_lma = TEXTADDR - LOAD_OFFSET;
+	. = TEXTADDR;
+	__init_begin = .;
+	HEAD_TEXT_SECTION
+	INIT_TEXT_SECTION(PAGE_SIZE)
+	INIT_DATA_SECTION(16)
+	PERCPU_SECTION(L1_CACHE_BYTES)
+	__init_end = .;
+
+	. = ALIGN(PAGE_SIZE);
+	_stext = .;
+	/* Real text segment */
+	.text : AT(ADDR(.text) - LOAD_OFFSET) {
+		_text = .;		/* Text and read-only data	*/
+		TEXT_TEXT
+		SCHED_TEXT
+		CPUIDLE_TEXT
+		LOCK_TEXT
+		KPROBES_TEXT
+		IRQENTRY_TEXT
+		*(.fixup)
+	}
+
+	_etext = .;			/* End of text and rodata section */
+
+	_sdata = .;
+	RO_DATA_SECTION(PAGE_SIZE)
+	RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
+	_edata  =  .;
+
+	EXCEPTION_TABLE(16)
+	NOTES
+	BSS_SECTION(4, 4, 4)
+	_end = .;
+
+	STABS_DEBUG
+	DWARF_DEBUG
+
+	DISCARDS
+}
diff --git a/arch/nds32/lib/Makefile b/arch/nds32/lib/Makefile
new file mode 100644
index 0000000..0f98401
--- /dev/null
+++ b/arch/nds32/lib/Makefile
@@ -0,0 +1,3 @@
+lib-y		:= copy_page.o memcpy.o memmove.o   \
+		   memset.o memzero.o \
+		   copy_from_user.o copy_to_user.o clear_user.o
diff --git a/arch/nds32/lib/clear_user.S b/arch/nds32/lib/clear_user.S
new file mode 100644
index 0000000..805dfcd
--- /dev/null
+++ b/arch/nds32/lib/clear_user.S
@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/errno.h>
+
+/* Prototype: int __arch_clear_user(void *addr, size_t sz)
+ * Purpose  : clear some user memory
+ * Params   : addr - user memory address to clear
+ *          : sz   - number of bytes to clear
+ * Returns  : number of bytes NOT cleared
+ */
+	.text
+	.align	5
+ENTRY(__arch_clear_user)
+	add	$r5, $r0, $r1
+	beqz	$r1, clear_exit
+	xor	$p1, $p1, $p1		! Use $p1=0 to clear mem
+	srli	$p0, $r1, #2		! $p0 = number of word to clear
+	andi	$r1, $r1, #3		! Bytes less than a word to copy
+	beqz	$p0, byte_clear		! Only less than a word to clear
+word_clear:
+USER(	smw.bim,$p1, [$r0], $p1)	! Clear the word
+	addi	$p0, $p0, #-1		! Decrease word count
+	bnez	$p0, word_clear		! Continue looping to clear all words
+	beqz	$r1, clear_exit		! No left bytes to copy
+byte_clear:
+USER(	sbi.bi,	$p1, [$r0], #1)		! Clear the byte
+	addi	$r1, $r1, #-1		! Decrease byte count
+	bnez	$r1, byte_clear		! Continue looping to clear all left bytes
+clear_exit:
+	move	$r0, $r1		! Set return value
+	ret
+
+	.section .fixup,"ax"
+	.align	0
+9001:
+	sub	$r0, $r5, $r0		! Bytes left to copy
+	ret
+	.previous
+ENDPROC(__arch_clear_user)
diff --git a/arch/nds32/lib/copy_from_user.S b/arch/nds32/lib/copy_from_user.S
new file mode 100644
index 0000000..ad1857b
--- /dev/null
+++ b/arch/nds32/lib/copy_from_user.S
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/errno.h>
+
+.macro 	lbi1 dst, addr, adj
+USER( lbi.bi, \dst, [\addr], \adj)
+.endm
+
+.macro 	sbi1 src, addr, adj
+sbi.bi	\src, [\addr], \adj
+.endm
+
+.macro	lmw1 start_reg, addr, end_reg
+USER( lmw.bim, \start_reg, [\addr], \end_reg)
+.endm
+
+.macro	smw1 start_reg, addr, end_reg
+smw.bim \start_reg, [\addr], \end_reg
+.endm
+
+
+/* Prototype: int __arch_copy_from_user(void *to, const char *from, size_t n)
+ * Purpose  : copy a block from user memory to kernel memory
+ * Params   : to   - kernel memory
+ *          : from - user memory
+ *          : n    - number of bytes to copy
+ * Returns  : Number of bytes NOT copied.
+ */
+
+.text
+ENTRY(__arch_copy_from_user)
+	add	$r5, $r0, $r2
+#include "copy_template.S"
+	move	$r0, $r2
+	ret
+.section .fixup,"ax"
+.align  2
+9001:
+	sub	$r0, $r5, $r0
+	ret
+.previous
+ENDPROC(__arch_copy_from_user)
diff --git a/arch/nds32/lib/copy_page.S b/arch/nds32/lib/copy_page.S
new file mode 100644
index 0000000..4a2ff85
--- /dev/null
+++ b/arch/nds32/lib/copy_page.S
@@ -0,0 +1,37 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+#include <asm/page.h>
+
+	.text
+ENTRY(copy_page)
+	pushm	$r2, $r10
+	movi	$r2, PAGE_SIZE >> 5
+.Lcopy_loop:
+	lmw.bim	$r3, [$r1], $r10
+	smw.bim	$r3, [$r0], $r10
+	subi45	$r2, #1
+	bnez38	$r2, .Lcopy_loop
+	popm	$r2, $r10
+	ret
+ENDPROC(copy_page)
+
+ENTRY(clear_page)
+	pushm	$r1, $r9
+	movi	$r1, PAGE_SIZE >> 5
+	movi55	$r2, #0
+	movi55	$r3, #0
+	movi55	$r4, #0
+	movi55	$r5, #0
+	movi55	$r6, #0
+	movi55	$r7, #0
+	movi55	$r8, #0
+	movi55	$r9, #0
+.Lclear_loop:
+	smw.bim	$r2, [$r0], $r9
+	subi45	$r1, #1
+	bnez38	$r1, .Lclear_loop
+	popm	$r1, $r9
+        ret
+ENDPROC(clear_page)
diff --git a/arch/nds32/lib/copy_template.S b/arch/nds32/lib/copy_template.S
new file mode 100644
index 0000000..3a9a2de
--- /dev/null
+++ b/arch/nds32/lib/copy_template.S
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+
+	beq	$r1, $r0, quit_memcpy
+	beqz	$r2, quit_memcpy
+	srli    $r3, $r2, #5	! check if len < cache-line size 32
+	beqz	$r3, word_copy_entry
+	andi	$r4, $r0, #0x3	! check byte-align
+	beqz	$r4, unalign_word_copy_entry
+
+	addi	$r4, $r4,#-4
+	abs	$r4, $r4	! check how many un-align byte to copy
+	sub	$r2, $r2, $r4	! update $R2
+
+unalign_byte_copy:
+	lbi1	$r3, $r1, #1
+	addi	$r4, $r4, #-1
+	sbi1	$r3, $r0, #1
+	bnez	$r4, unalign_byte_copy
+	beqz	$r2, quit_memcpy
+
+unalign_word_copy_entry:
+	andi	$r3, $r0, 0x1f	! check cache-line unaligncount
+	beqz	$r3, cache_copy
+
+	addi	$r3, $r3, #-32
+	abs	$r3, $r3
+	sub	$r2, $r2, $r3	! update $R2
+
+unalign_word_copy:
+	lmw1	$r4, $r1, $r4
+	addi	$r3, $r3, #-4
+	smw1	$r4, $r0, $r4
+	bnez	$r3, unalign_word_copy
+	beqz	$r2, quit_memcpy
+
+	addi	$r3, $r2, #-32	! to check $r2< cache_line , than go to word_copy
+	bltz	$r3, word_copy_entry
+cache_copy:
+	srli	$r3, $r2, #5
+	beqz	$r3, word_copy_entry
+3:
+	lmw1	$r17, $r1, $r24
+	addi	$r3, $r3, #-1
+	smw1	$r17, $r0, $r24
+	bnez	$r3, 3b
+
+word_copy_entry:
+	andi	$r2, $r2, #31
+
+	beqz	$r2, quit_memcpy
+5:
+	srli	$r3, $r2, #2
+	beqz	$r3, byte_copy
+word_copy:
+	lmw1	$r4, $r1, $r4
+	addi	$r3, $r3, #-1
+	smw1	$r4, $r0, $r4
+	bnez	$r3, word_copy
+	andi	$r2, $r2, #3
+	beqz	$r2, quit_memcpy
+byte_copy:
+	lbi1	$r3, $r1, #1
+	addi	$r2, $r2, #-1
+
+	sbi1	$r3, $r0, #1
+	bnez	$r2, byte_copy
+quit_memcpy:
diff --git a/arch/nds32/lib/copy_to_user.S b/arch/nds32/lib/copy_to_user.S
new file mode 100644
index 0000000..3230044
--- /dev/null
+++ b/arch/nds32/lib/copy_to_user.S
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/errno.h>
+
+.macro 	lbi1 dst, addr, adj
+lbi.bi	\dst, [\addr], \adj
+.endm
+
+.macro 	sbi1 src, addr, adj
+USER( sbi.bi, \src, [\addr], \adj)
+.endm
+
+.macro	lmw1 start_reg, addr, end_reg
+lmw.bim \start_reg, [\addr], \end_reg
+.endm
+
+.macro	smw1 start_reg, addr, end_reg
+USER( smw.bim, \start_reg, [\addr], \end_reg)
+.endm
+
+
+/* Prototype: int __arch_copy_to_user(void *to, const char *from, size_t n)
+ * Purpose  : copy a block to user memory from kernel memory
+ * Params   : to   - user memory
+ *          : from - kernel memory
+ *          : n    - number of bytes to copy
+ * Returns  : Number of bytes NOT copied.
+ */
+
+.text
+ENTRY(__arch_copy_to_user)
+	add	$r5, $r0, $r2
+#include "copy_template.S"
+	move	$r0, $r2
+	ret
+.section .fixup,"ax"
+.align  2
+9001:
+	sub	$r0, $r5, $r0
+	ret
+.previous
+ENDPROC(__arch_copy_to_user)
diff --git a/arch/nds32/lib/memcpy.S b/arch/nds32/lib/memcpy.S
new file mode 100644
index 0000000..a2345ea
--- /dev/null
+++ b/arch/nds32/lib/memcpy.S
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+
+
+.macro 	lbi1 dst, addr, adj
+lbi.bi	\dst, [\addr], \adj
+.endm
+
+.macro 	sbi1 src, addr, adj
+sbi.bi	\src, [\addr], \adj
+.endm
+
+.macro	lmw1 start_reg, addr, end_reg
+lmw.bim \start_reg, [\addr], \end_reg
+.endm
+
+.macro	smw1 start_reg, addr, end_reg
+smw.bim \start_reg, [\addr], \end_reg
+.endm
+
+.text
+ENTRY(memcpy)
+	move	$r5, $r0
+#include "copy_template.S"
+	move	$r0, $r5
+	ret
+
+ENDPROC(memcpy)
diff --git a/arch/nds32/lib/memmove.S b/arch/nds32/lib/memmove.S
new file mode 100644
index 0000000..c823aad
--- /dev/null
+++ b/arch/nds32/lib/memmove.S
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+
+/*
+  void *memmove(void *dst, const void *src, int n);
+
+  dst: $r0
+  src: $r1
+  n  : $r2
+  ret: $r0 - pointer to the memory area dst.
+*/
+	.text
+
+ENTRY(memmove)
+	move	$r5, $r0		! Set return value = det
+	beq	$r0, $r1, exit_memcpy	! Exit when det = src
+	beqz	$r2, exit_memcpy	! Exit when n = 0
+	pushm	$t0, $t1		! Save reg
+	srli	$p1, $r2, #2		! $p1 is how many words to copy
+
+	! Avoid data lost when memory overlap
+	! Copy data reversely when src < dst
+	slt	$p0, $r0, $r1		! check if $r0 < $r1
+	beqz	$p0, do_reverse		! branch if dst > src
+
+	! No reverse, dst < src
+	andi	$r2, $r2, #3		! How many bytes are less than a word
+	li	$t0, #1			! Determining copy direction in byte_cpy
+	beqz	$p1, byte_cpy		! When n is less than a word
+
+word_cpy:
+	lmw.bim	$p0, [$r1], $p0		! Read a word from src
+	addi	$p1, $p1, #-1		! How many words left to copy
+	smw.bim	$p0, [$r0], $p0		! Copy the word to det
+	bnez	$p1, word_cpy		! If remained words > 0
+	beqz	$r2, end_memcpy		! No left bytes to copy
+	b	byte_cpy
+
+do_reverse:
+	add	$r0, $r0, $r2		! Start with the end of $r0
+	add	$r1, $r1, $r2		! Start with the end of $r1
+	andi	$r2, $r2, #3		! How many bytes are less than a word
+	li	$t0, #-1		! Determining copy direction in byte_cpy
+	beqz	$p1, reverse_byte_cpy	! When n is less than a word
+
+reverse_word_cpy:
+	lmw.adm	$p0, [$r1], $p0		! Read a word from src
+	addi	$p1, $p1, #-1		! How many words left to copy
+	smw.adm	$p0, [$r0], $p0		! Copy the word to det
+	bnez	$p1, reverse_word_cpy	! If remained words > 0
+	beqz	$r2, end_memcpy		! No left bytes to copy
+
+reverse_byte_cpy:
+	addi	$r0, $r0, #-1
+	addi	$r1, $r1, #-1
+byte_cpy:				! Less than 4 bytes to copy now
+	lb.bi	$p0, [$r1], $t0		! Read a byte from src
+	addi	$r2, $r2, #-1		! How many bytes left to copy
+	sb.bi	$p0, [$r0], $t0		! copy the byte to det
+	bnez	$r2, byte_cpy		! If remained bytes > 0
+
+end_memcpy:
+	popm	$t0, $t1
+exit_memcpy:
+	move	$r0, $r5
+	ret
+
+ENDPROC(memmove)
diff --git a/arch/nds32/lib/memset.S b/arch/nds32/lib/memset.S
new file mode 100644
index 0000000..193cb6c
--- /dev/null
+++ b/arch/nds32/lib/memset.S
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+
+	.text
+ENTRY(memset)
+	move	$r5, $r0		! Return value
+	beqz	$r2, end_memset		! Exit when len = 0
+	srli	$p1, $r2, 2		! $p1 is how many words to copy
+	andi	$r2, $r2, 3		! How many bytes are less than a word
+	beqz	$p1, byte_set		! When n is less than a word
+
+	! set $r1 from ??????ab to abababab
+	andi	$r1, $r1, #0x00ff	! $r1 = 000000ab
+	slli	$p0, $r1, #8		! $p0 = 0000ab00
+	or	$r1, $r1, $p0		! $r1 = 0000abab
+	slli	$p0, $r1, #16		! $p0 = abab0000
+	or	$r1, $r1, $p0		! $r1 = abababab
+word_set:
+	addi	$p1, $p1, #-1		! How many words left to copy
+	smw.bim	$r1, [$r0], $r1		! Copy the word to det
+	bnez	$p1, word_set		! Still words to set, continue looping
+	beqz	$r2, end_memset		! No left byte to set
+byte_set:				! Less than 4 bytes left to set
+	addi	$r2, $r2, #-1		! Decrease len by 1
+	sbi.bi	$r1, [$r0], #1		! Set data of the next byte to $r1
+	bnez	$r2, byte_set		! Still bytes left to set
+end_memset:
+	move	$r0, $r5
+	ret
+
+ENDPROC(memset)
diff --git a/arch/nds32/lib/memzero.S b/arch/nds32/lib/memzero.S
new file mode 100644
index 0000000..f055972
--- /dev/null
+++ b/arch/nds32/lib/memzero.S
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/linkage.h>
+
+	.text
+ENTRY(memzero)
+	beqz	$r1, 1f
+	push	$lp
+	move    $r2, $r1
+	move    $r1, #0
+	push	$r0
+	bal     memset
+	pop	$r0
+	pop	$lp
+1:
+        ret
+ENDPROC(memzero)
diff --git a/arch/nds32/mm/Makefile b/arch/nds32/mm/Makefile
new file mode 100644
index 0000000..6b68558
--- /dev/null
+++ b/arch/nds32/mm/Makefile
@@ -0,0 +1,7 @@
+obj-y				:= extable.o tlb.o \
+				   fault.o init.o ioremap.o mmap.o \
+                                   mm-nds32.o cacheflush.o proc.o
+
+obj-$(CONFIG_ALIGNMENT_TRAP)	+= alignment.o
+obj-$(CONFIG_HIGHMEM)           += highmem.o
+CFLAGS_proc-n13.o		+= -fomit-frame-pointer
diff --git a/arch/nds32/mm/alignment.c b/arch/nds32/mm/alignment.c
new file mode 100644
index 0000000..b96a01b
--- /dev/null
+++ b/arch/nds32/mm/alignment.c
@@ -0,0 +1,576 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/proc_fs.h>
+#include <linux/uaccess.h>
+#include <linux/sysctl.h>
+#include <asm/unaligned.h>
+
+#define DEBUG(enable, tagged, ...)				\
+	do{							\
+		if (enable) {					\
+			if (tagged)				\
+			pr_warn("[ %30s() ] ", __func__);	\
+			pr_warn(__VA_ARGS__);			\
+		}						\
+	} while (0)
+
+#define RT(inst)	(((inst) >> 20) & 0x1FUL)
+#define RA(inst)	(((inst) >> 15) & 0x1FUL)
+#define RB(inst)	(((inst) >> 10) & 0x1FUL)
+#define SV(inst)	(((inst) >> 8) & 0x3UL)
+#define IMM(inst)	(((inst) >> 0) & 0x3FFFUL)
+
+#define RA3(inst)	(((inst) >> 3) & 0x7UL)
+#define RT3(inst)	(((inst) >> 6) & 0x7UL)
+#define IMM3U(inst)	(((inst) >> 0) & 0x7UL)
+
+#define RA5(inst)	(((inst) >> 0) & 0x1FUL)
+#define RT4(inst)	(((inst) >> 5) & 0xFUL)
+
+#define __get8_data(val,addr,err)	\
+	__asm__(					\
+	"1:	lbi.bi	%1, [%2], #1\n"			\
+	"2:\n"						\
+	"	.pushsection .text.fixup,\"ax\"\n"	\
+	"	.align	2\n"				\
+	"3:	movi	%0, #1\n"			\
+	"	j	2b\n"				\
+	"	.popsection\n"				\
+	"	.pushsection __ex_table,\"a\"\n"	\
+	"	.align	3\n"				\
+	"	.long	1b, 3b\n"			\
+	"	.popsection\n"				\
+	: "=r" (err), "=&r" (val), "=r" (addr)		\
+	: "0" (err), "2" (addr))
+
+#define get16_data(addr, val_ptr)				\
+	do {							\
+		unsigned int err = 0, v, a = addr;		\
+		__get8_data(v,a,err);				\
+		*val_ptr =  v << 0;				\
+		__get8_data(v,a,err);				\
+		*val_ptr |= v << 8;				\
+		if (err)					\
+			goto fault;				\
+		*val_ptr = le16_to_cpu(*val_ptr);		\
+	} while(0)
+
+#define get32_data(addr, val_ptr)				\
+	do {							\
+		unsigned int err = 0, v, a = addr;		\
+		__get8_data(v,a,err);				\
+		*val_ptr =  v << 0;				\
+		__get8_data(v,a,err);				\
+		*val_ptr |= v << 8;				\
+		__get8_data(v,a,err);				\
+		*val_ptr |= v << 16;				\
+		__get8_data(v,a,err);				\
+		*val_ptr |= v << 24;				\
+		if (err)					\
+			goto fault;				\
+		*val_ptr = le32_to_cpu(*val_ptr);		\
+	} while(0)
+
+#define get_data(addr, val_ptr, len)				\
+	if (len == 2)						\
+		get16_data(addr, val_ptr);			\
+	else							\
+		get32_data(addr, val_ptr);
+
+#define set16_data(addr, val)					\
+	do {							\
+		unsigned int err = 0, *ptr = addr ;		\
+		val = le32_to_cpu(val);				\
+		__asm__(					\
+                "1:	sbi.bi 	%2, [%1], #1\n"			\
+                "	srli 	%2, %2, #8\n"			\
+                "2:	sbi	%2, [%1]\n"			\
+		"3:\n"						\
+		"	.pushsection .text.fixup,\"ax\"\n"	\
+		"	.align	2\n"				\
+		"4:	movi	%0, #1\n"			\
+		"	j	3b\n"				\
+		"	.popsection\n"				\
+		"	.pushsection __ex_table,\"a\"\n"	\
+		"	.align	3\n"				\
+		"	.long	1b, 4b\n"			\
+		"	.long	2b, 4b\n"			\
+		"	.popsection\n"				\
+		: "=r" (err), "+r" (ptr), "+r" (val)		\
+		: "0" (err)					\
+		);						\
+		if (err)					\
+			goto fault;				\
+	} while(0)
+
+#define set32_data(addr, val)					\
+	do {							\
+		unsigned int err = 0, *ptr = addr ;		\
+		val = le32_to_cpu(val);				\
+		__asm__(					\
+                "1:	sbi.bi 	%2, [%1], #1\n"			\
+                "	srli 	%2, %2, #8\n"			\
+                "2:	sbi.bi 	%2, [%1], #1\n"			\
+                "	srli 	%2, %2, #8\n"			\
+                "3:	sbi.bi 	%2, [%1], #1\n"			\
+                "	srli 	%2, %2, #8\n"			\
+                "4:	sbi 	%2, [%1]\n"			\
+		"5:\n"						\
+		"	.pushsection .text.fixup,\"ax\"\n"	\
+		"	.align	2\n"				\
+		"6:	movi	%0, #1\n"			\
+		"	j	5b\n"				\
+		"	.popsection\n"				\
+		"	.pushsection __ex_table,\"a\"\n"	\
+		"	.align	3\n"				\
+		"	.long	1b, 6b\n"			\
+		"	.long	2b, 6b\n"			\
+		"	.long	3b, 6b\n"			\
+		"	.long	4b, 6b\n"			\
+		"	.popsection\n"				\
+		: "=r" (err), "+r" (ptr), "+r" (val)		\
+		: "0" (err)					\
+		);						\
+		if (err)					\
+			goto fault;				\
+	} while(0)
+#define set_data(addr, val, len)				\
+	if (len == 2)						\
+		set16_data(addr, val);				\
+	else							\
+		set32_data(addr, val);
+#define NDS32_16BIT_INSTRUCTION	0x80000000
+
+extern pte_t va_present(struct mm_struct *mm, unsigned long addr);
+extern pte_t va_kernel_present(unsigned long addr);
+extern int va_readable(struct pt_regs *regs, unsigned long addr);
+extern int va_writable(struct pt_regs *regs, unsigned long addr);
+
+int unalign_access_mode = 0, unalign_access_debug = 0;
+
+static inline unsigned long *idx_to_addr(struct pt_regs *regs, int idx)
+{
+	/* this should be consistent with ptrace.h */
+	if (idx >= 0 && idx <= 25)	/* R0-R25 */
+		return &regs->uregs[0] + idx;
+	else if (idx >= 28 && idx <= 30)	/* FP, GP, LP */
+		return &regs->fp + (idx - 28);
+	else if (idx == 31)	/* SP */
+		return &regs->sp;
+	else
+		return NULL;	/* cause a segfault */
+}
+
+static inline unsigned long get_inst(unsigned long addr)
+{
+	return be32_to_cpu(get_unaligned((u32 *) addr));
+}
+
+static inline unsigned long sign_extend(unsigned long val, int len)
+{
+	unsigned long ret = 0;
+	unsigned char *s, *t;
+	int i = 0;
+
+	val = cpu_to_le32(val);
+
+	s = (void *)&val;
+	t = (void *)&ret;
+
+	while (i++ < len)
+		*t++ = *s++;
+
+	if (((*(t - 1)) & 0x80) && (i < 4)) {
+
+		while (i++ <= 4)
+			*t++ = 0xff;
+	}
+
+	return le32_to_cpu(ret);
+}
+
+static inline int do_16(unsigned long inst, struct pt_regs *regs)
+{
+	int imm, regular, load, len, addr_mode, idx_mode;
+	unsigned long unaligned_addr, target_val, source_idx, target_idx,
+	    shift = 0;
+	switch ((inst >> 9) & 0x3F) {
+
+	case 0x12:		/* LHI333    */
+		imm = 1;
+		regular = 1;
+		load = 1;
+		len = 2;
+		addr_mode = 3;
+		idx_mode = 3;
+		break;
+	case 0x10:		/* LWI333    */
+		imm = 1;
+		regular = 1;
+		load = 1;
+		len = 4;
+		addr_mode = 3;
+		idx_mode = 3;
+		break;
+	case 0x11:		/* LWI333.bi */
+		imm = 1;
+		regular = 0;
+		load = 1;
+		len = 4;
+		addr_mode = 3;
+		idx_mode = 3;
+		break;
+	case 0x1A:		/* LWI450    */
+		imm = 0;
+		regular = 1;
+		load = 1;
+		len = 4;
+		addr_mode = 5;
+		idx_mode = 4;
+		break;
+	case 0x16:		/* SHI333    */
+		imm = 1;
+		regular = 1;
+		load = 0;
+		len = 2;
+		addr_mode = 3;
+		idx_mode = 3;
+		break;
+	case 0x14:		/* SWI333    */
+		imm = 1;
+		regular = 1;
+		load = 0;
+		len = 4;
+		addr_mode = 3;
+		idx_mode = 3;
+		break;
+	case 0x15:		/* SWI333.bi */
+		imm = 1;
+		regular = 0;
+		load = 0;
+		len = 4;
+		addr_mode = 3;
+		idx_mode = 3;
+		break;
+	case 0x1B:		/* SWI450    */
+		imm = 0;
+		regular = 1;
+		load = 0;
+		len = 4;
+		addr_mode = 5;
+		idx_mode = 4;
+		break;
+
+	default:
+		return -EFAULT;
+	}
+
+	if (addr_mode == 3) {
+		unaligned_addr = *idx_to_addr(regs, RA3(inst));
+		source_idx = RA3(inst);
+	} else {
+		unaligned_addr = *idx_to_addr(regs, RA5(inst));
+		source_idx = RA5(inst);
+	}
+
+	if (idx_mode == 3)
+		target_idx = RT3(inst);
+	else
+		target_idx = RT4(inst);
+
+	if (imm)
+		shift = IMM3U(inst) * len;
+
+	if (regular)
+		unaligned_addr += shift;
+
+	if (load) {
+		if (!access_ok(VERIFY_READ, (void *)unaligned_addr, len))
+			return -EACCES;
+
+		get_data(unaligned_addr, &target_val, len);
+		*idx_to_addr(regs, target_idx) = target_val;
+	} else {
+		if (!access_ok(VERIFY_WRITE, (void *)unaligned_addr, len))
+			return -EACCES;
+		target_val = *idx_to_addr(regs, target_idx);
+		set_data((void *)unaligned_addr, target_val, len);
+	}
+
+	if (!regular)
+		*idx_to_addr(regs, source_idx) = unaligned_addr + shift;
+	regs->ipc += 2;
+
+	return 0;
+fault:
+	return -EACCES;
+}
+
+static inline int do_32(unsigned long inst, struct pt_regs *regs)
+{
+	int imm, regular, load, len, sign_ext;
+	unsigned long unaligned_addr, target_val, shift;
+
+	unaligned_addr = *idx_to_addr(regs, RA(inst));
+
+	switch ((inst >> 25) << 1) {
+
+	case 0x02:		/* LHI       */
+		imm = 1;
+		regular = 1;
+		load = 1;
+		len = 2;
+		sign_ext = 0;
+		break;
+	case 0x0A:		/* LHI.bi    */
+		imm = 1;
+		regular = 0;
+		load = 1;
+		len = 2;
+		sign_ext = 0;
+		break;
+	case 0x22:		/* LHSI      */
+		imm = 1;
+		regular = 1;
+		load = 1;
+		len = 2;
+		sign_ext = 1;
+		break;
+	case 0x2A:		/* LHSI.bi   */
+		imm = 1;
+		regular = 0;
+		load = 1;
+		len = 2;
+		sign_ext = 1;
+		break;
+	case 0x04:		/* LWI       */
+		imm = 1;
+		regular = 1;
+		load = 1;
+		len = 4;
+		sign_ext = 0;
+		break;
+	case 0x0C:		/* LWI.bi    */
+		imm = 1;
+		regular = 0;
+		load = 1;
+		len = 4;
+		sign_ext = 0;
+		break;
+	case 0x12:		/* SHI       */
+		imm = 1;
+		regular = 1;
+		load = 0;
+		len = 2;
+		sign_ext = 0;
+		break;
+	case 0x1A:		/* SHI.bi    */
+		imm = 1;
+		regular = 0;
+		load = 0;
+		len = 2;
+		sign_ext = 0;
+		break;
+	case 0x14:		/* SWI       */
+		imm = 1;
+		regular = 1;
+		load = 0;
+		len = 4;
+		sign_ext = 0;
+		break;
+	case 0x1C:		/* SWI.bi    */
+		imm = 1;
+		regular = 0;
+		load = 0;
+		len = 4;
+		sign_ext = 0;
+		break;
+
+	default:
+		switch (inst & 0xff) {
+
+		case 0x01:	/* LH        */
+			imm = 0;
+			regular = 1;
+			load = 1;
+			len = 2;
+			sign_ext = 0;
+			break;
+		case 0x05:	/* LH.bi     */
+			imm = 0;
+			regular = 0;
+			load = 1;
+			len = 2;
+			sign_ext = 0;
+			break;
+		case 0x11:	/* LHS       */
+			imm = 0;
+			regular = 1;
+			load = 1;
+			len = 2;
+			sign_ext = 1;
+			break;
+		case 0x15:	/* LHS.bi    */
+			imm = 0;
+			regular = 0;
+			load = 1;
+			len = 2;
+			sign_ext = 1;
+			break;
+		case 0x02:	/* LW        */
+			imm = 0;
+			regular = 1;
+			load = 1;
+			len = 4;
+			sign_ext = 0;
+			break;
+		case 0x06:	/* LW.bi     */
+			imm = 0;
+			regular = 0;
+			load = 1;
+			len = 4;
+			sign_ext = 0;
+			break;
+		case 0x09:	/* SH        */
+			imm = 0;
+			regular = 1;
+			load = 0;
+			len = 2;
+			sign_ext = 0;
+			break;
+		case 0x0D:	/* SH.bi     */
+			imm = 0;
+			regular = 0;
+			load = 0;
+			len = 2;
+			sign_ext = 0;
+			break;
+		case 0x0A:	/* SW        */
+			imm = 0;
+			regular = 1;
+			load = 0;
+			len = 4;
+			sign_ext = 0;
+			break;
+		case 0x0E:	/* SW.bi     */
+			imm = 0;
+			regular = 0;
+			load = 0;
+			len = 4;
+			sign_ext = 0;
+			break;
+
+		default:
+			return -EFAULT;
+		}
+	}
+
+	if (imm)
+		shift = IMM(inst) * len;
+	else
+		shift = *idx_to_addr(regs, RB(inst)) << SV(inst);
+
+	if (regular)
+		unaligned_addr += shift;
+
+	if (load) {
+
+		if (!access_ok(VERIFY_READ, (void *)unaligned_addr, len))
+			return -EACCES;
+
+		get_data(unaligned_addr, &target_val, len);
+
+		if (sign_ext)
+			*idx_to_addr(regs, RT(inst)) =
+			    sign_extend(target_val, len);
+		else
+			*idx_to_addr(regs, RT(inst)) = target_val;
+	} else {
+
+		if (!access_ok(VERIFY_WRITE, (void *)unaligned_addr, len))
+			return -EACCES;
+
+		target_val = *idx_to_addr(regs, RT(inst));
+		set_data((void *)unaligned_addr, target_val, len);
+	}
+
+	if (!regular)
+		*idx_to_addr(regs, RA(inst)) = unaligned_addr + shift;
+
+	regs->ipc += 4;
+
+	return 0;
+fault:
+	return -EACCES;
+}
+
+int do_unaligned_access(unsigned long addr, struct pt_regs *regs)
+{
+	unsigned long inst;
+	int ret = -EFAULT;
+	mm_segment_t seg = get_fs();
+
+	inst = get_inst(regs->ipc);
+
+	DEBUG((unalign_access_debug > 0), 1,
+	      "Faulting addr: 0x%08lx, pc: 0x%08lx [inst: 0x%08lx ]\n", addr,
+	      regs->ipc, inst);
+
+	set_fs(USER_DS);
+
+	if (inst & NDS32_16BIT_INSTRUCTION)
+		ret = do_16((inst >> 16) & 0xffff, regs);
+	else
+		ret = do_32(inst, regs);
+	set_fs(seg);
+
+	return ret;
+}
+
+#ifdef CONFIG_PROC_FS
+
+static struct ctl_table alignment_tbl[3] = {
+	{
+	 .procname = "enable",
+	 .data = &unalign_access_mode,
+	 .maxlen = sizeof(unalign_access_mode),
+	 .mode = 0666,
+	 .proc_handler = &proc_dointvec
+	}
+	,
+	{
+	 .procname = "debug_info",
+	 .data = &unalign_access_debug,
+	 .maxlen = sizeof(unalign_access_debug),
+	 .mode = 0644,
+	 .proc_handler = &proc_dointvec
+	}
+	,
+	{}
+};
+
+static struct ctl_table nds32_sysctl_table[2] = {
+	{
+	 .procname = "unaligned_acess",
+	 .mode = 0555,
+	 .child = alignment_tbl},
+	{}
+};
+
+static struct ctl_path nds32_path[2] = {
+	{.procname = "nds32"},
+	{}
+};
+
+/*
+ * Initialize nds32 alignment-correction interface
+ */
+static int __init nds32_sysctl_init(void)
+{
+	register_sysctl_paths(nds32_path, nds32_sysctl_table);
+	return 0;
+}
+
+__initcall(nds32_sysctl_init);
+#endif /* CONFIG_PROC_FS */
diff --git a/arch/nds32/mm/cacheflush.c b/arch/nds32/mm/cacheflush.c
new file mode 100644
index 0000000..6eb786a
--- /dev/null
+++ b/arch/nds32/mm/cacheflush.c
@@ -0,0 +1,322 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/pagemap.h>
+#include <linux/module.h>
+#include <asm/cacheflush.h>
+#include <asm/proc-fns.h>
+#include <asm/shmparam.h>
+#include <asm/cache_info.h>
+
+extern struct cache_info L1_cache_info[2];
+
+#ifndef CONFIG_CPU_CACHE_ALIASING
+void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
+		      pte_t * pte)
+{
+	struct page *page;
+	unsigned long pfn = pte_pfn(*pte);
+	unsigned long flags;
+
+	if (!pfn_valid(pfn))
+		return;
+
+	if (vma->vm_mm == current->active_mm) {
+		local_irq_save(flags);
+		__nds32__mtsr_dsb(addr, NDS32_SR_TLB_VPN);
+		__nds32__tlbop_rwr(*pte);
+		__nds32__isb();
+		local_irq_restore(flags);
+	}
+	page = pfn_to_page(pfn);
+
+	if ((test_and_clear_bit(PG_dcache_dirty, &page->flags)) ||
+	    (vma->vm_flags & VM_EXEC)) {
+
+		if (!PageHighMem(page)) {
+			cpu_cache_wbinval_page((unsigned long)
+					       page_address(page),
+					       vma->vm_flags & VM_EXEC);
+		} else {
+			unsigned long kaddr = (unsigned long)kmap_atomic(page);
+			cpu_cache_wbinval_page(kaddr, vma->vm_flags & VM_EXEC);
+			kunmap_atomic((void *)kaddr);
+		}
+	}
+}
+#else
+extern pte_t va_present(struct mm_struct *mm, unsigned long addr);
+
+static inline unsigned long aliasing(unsigned long addr, unsigned long page)
+{
+	return ((addr & PAGE_MASK) ^ page) & (SHMLBA - 1);
+}
+
+static inline unsigned long kremap0(unsigned long uaddr, unsigned long pa)
+{
+	unsigned long kaddr, pte;
+
+#define BASE_ADDR0 0xffffc000
+	kaddr = BASE_ADDR0 | (uaddr & L1_cache_info[DCACHE].aliasing_mask);
+	pte = (pa | PAGE_KERNEL);
+	__nds32__mtsr_dsb(kaddr, NDS32_SR_TLB_VPN);
+	__nds32__tlbop_rwlk(pte);
+	__nds32__isb();
+	return kaddr;
+}
+
+static inline void kunmap01(unsigned long kaddr)
+{
+	__nds32__tlbop_unlk(kaddr);
+	__nds32__tlbop_inv(kaddr);
+	__nds32__isb();
+}
+
+static inline unsigned long kremap1(unsigned long uaddr, unsigned long pa)
+{
+	unsigned long kaddr, pte;
+
+#define BASE_ADDR1 0xffff8000
+	kaddr = BASE_ADDR1 | (uaddr & L1_cache_info[DCACHE].aliasing_mask);
+	pte = (pa | PAGE_KERNEL);
+	__nds32__mtsr_dsb(kaddr, NDS32_SR_TLB_VPN);
+	__nds32__tlbop_rwlk(pte);
+	__nds32__isb();
+	return kaddr;
+}
+
+void flush_cache_mm(struct mm_struct *mm)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	cpu_dcache_wbinval_all();
+	cpu_icache_inval_all();
+	local_irq_restore(flags);
+}
+
+void flush_cache_dup_mm(struct mm_struct *mm)
+{
+}
+
+void flush_cache_range(struct vm_area_struct *vma,
+		       unsigned long start, unsigned long end)
+{
+	unsigned long flags;
+
+	if ((end - start) > 8 * PAGE_SIZE) {
+		cpu_dcache_wbinval_all();
+		if (vma->vm_flags & VM_EXEC)
+			cpu_icache_inval_all();
+		return;
+	}
+	local_irq_save(flags);
+	while (start < end) {
+		if (va_present(vma->vm_mm, start))
+			cpu_cache_wbinval_page(start, vma->vm_flags & VM_EXEC);
+		start += PAGE_SIZE;
+	}
+	local_irq_restore(flags);
+	return;
+}
+
+void flush_cache_page(struct vm_area_struct *vma,
+		      unsigned long addr, unsigned long pfn)
+{
+	unsigned long vto, flags;
+
+	local_irq_save(flags);
+	vto = kremap0(addr, pfn << PAGE_SHIFT);
+	cpu_cache_wbinval_page(vto, vma->vm_flags & VM_EXEC);
+	kunmap01(vto);
+	local_irq_restore(flags);
+}
+
+void flush_cache_vmap(unsigned long start, unsigned long end)
+{
+	cpu_dcache_wbinval_all();
+	cpu_icache_inval_all();
+}
+
+void flush_cache_vunmap(unsigned long start, unsigned long end)
+{
+	cpu_dcache_wbinval_all();
+	cpu_icache_inval_all();
+}
+
+void copy_user_highpage(struct page *to, struct page *from,
+			unsigned long vaddr, struct vm_area_struct *vma)
+{
+	unsigned long vto, vfrom, flags, kto, kfrom, pfrom, pto;
+	kto = ((unsigned long)page_address(to) & PAGE_MASK);
+	kfrom = ((unsigned long)page_address(from) & PAGE_MASK);
+	pto = page_to_phys(to);
+	pfrom = page_to_phys(from);
+
+	if (aliasing(vaddr, (unsigned long)kfrom))
+		cpu_dcache_wb_page((unsigned long)kfrom);
+	if (aliasing(vaddr, (unsigned long)kto))
+		cpu_dcache_inval_page((unsigned long)kto);
+	local_irq_save(flags);
+	vto = kremap0(vaddr, pto);
+	vfrom = kremap1(vaddr, pfrom);
+	copy_page((void *)vto, (void *)vfrom);
+	kunmap01(vfrom);
+	kunmap01(vto);
+	local_irq_restore(flags);
+}
+
+EXPORT_SYMBOL(copy_user_highpage);
+
+void clear_user_highpage(struct page *page, unsigned long vaddr)
+{
+	unsigned long vto, flags, kto;
+
+	kto = ((unsigned long)page_address(page) & PAGE_MASK);
+
+	local_irq_save(flags);
+	if (aliasing(kto, vaddr) && kto != 0) {
+		cpu_dcache_inval_page(kto);
+		cpu_icache_inval_page(kto);
+	}
+	vto = kremap0(vaddr, page_to_phys(page));
+	clear_page((void *)vto);
+	kunmap01(vto);
+	local_irq_restore(flags);
+}
+
+EXPORT_SYMBOL(clear_user_highpage);
+
+void flush_dcache_page(struct page *page)
+{
+	struct address_space *mapping;
+
+	mapping = page_mapping(page);
+	if (mapping && !mapping_mapped(mapping))
+		set_bit(PG_dcache_dirty, &page->flags);
+	else {
+		int i, pc;
+		unsigned long vto, kaddr, flags;
+		kaddr = (unsigned long)page_address(page);
+		cpu_dcache_wbinval_page(kaddr);
+		pc = CACHE_SET(DCACHE) * CACHE_LINE_SIZE(DCACHE) / PAGE_SIZE;
+		local_irq_save(flags);
+		for (i = 0; i < pc; i++) {
+			vto =
+			    kremap0(kaddr + i * PAGE_SIZE, page_to_phys(page));
+			cpu_dcache_wbinval_page(vto);
+			kunmap01(vto);
+		}
+		local_irq_restore(flags);
+	}
+}
+
+void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
+		       unsigned long vaddr, void *dst, void *src, int len)
+{
+	unsigned long line_size, start, end, vto, flags;
+
+	local_irq_save(flags);
+	vto = kremap0(vaddr, page_to_phys(page));
+	dst = (void *)(vto | (vaddr & (PAGE_SIZE - 1)));
+	memcpy(dst, src, len);
+	if (vma->vm_flags & VM_EXEC) {
+		line_size = L1_cache_info[DCACHE].line_size;
+		start = (unsigned long)dst & ~(line_size - 1);
+		end =
+		    ((unsigned long)dst + len + line_size - 1) & ~(line_size -
+								   1);
+		cpu_cache_wbinval_range(start, end, 1);
+	}
+	kunmap01(vto);
+	local_irq_restore(flags);
+}
+
+void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
+			 unsigned long vaddr, void *dst, void *src, int len)
+{
+	unsigned long vto, flags;
+
+	local_irq_save(flags);
+	vto = kremap0(vaddr, page_to_phys(page));
+	src = (void *)(vto | (vaddr & (PAGE_SIZE - 1)));
+	memcpy(dst, src, len);
+	kunmap01(vto);
+	local_irq_restore(flags);
+}
+
+void flush_anon_page(struct vm_area_struct *vma,
+		     struct page *page, unsigned long vaddr)
+{
+	unsigned long flags;
+	if (!PageAnon(page))
+		return;
+
+	if (vma->vm_mm != current->active_mm)
+		return;
+
+	local_irq_save(flags);
+	if (vma->vm_flags & VM_EXEC)
+		cpu_icache_inval_page(vaddr & PAGE_MASK);
+	cpu_dcache_wbinval_page((unsigned long)page_address(page));
+	local_irq_restore(flags);
+}
+
+void flush_kernel_dcache_page(struct page *page)
+{
+	unsigned long flags;
+	local_irq_save(flags);
+	cpu_dcache_wbinval_page((unsigned long)page_address(page));
+	local_irq_restore(flags);
+}
+
+void flush_icache_range(unsigned long start, unsigned long end)
+{
+	unsigned long line_size, flags;
+	line_size = L1_cache_info[DCACHE].line_size;
+	start = start & ~(line_size - 1);
+	end = (end + line_size - 1) & ~(line_size - 1);
+	local_irq_save(flags);
+	cpu_cache_wbinval_range(start, end, 1);
+	local_irq_restore(flags);
+}
+
+void flush_icache_page(struct vm_area_struct *vma, struct page *page)
+{
+	unsigned long flags;
+	local_irq_save(flags);
+	cpu_cache_wbinval_page((unsigned long)page_address(page),
+			       vma->vm_flags & VM_EXEC);
+	local_irq_restore(flags);
+}
+
+void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
+		      pte_t * pte)
+{
+	struct page *page;
+	unsigned long flags;
+	unsigned long pfn = pte_pfn(*pte);
+
+	if (!pfn_valid(pfn))
+		return;
+
+	if (vma->vm_mm == current->active_mm) {
+		local_irq_save(flags);
+		__nds32__mtsr_dsb(addr, NDS32_SR_TLB_VPN);
+		__nds32__tlbop_rwr(*pte);
+		__nds32__isb();
+		local_irq_restore(flags);
+	}
+
+	page = pfn_to_page(pfn);
+	if (test_and_clear_bit(PG_dcache_dirty, &page->flags) ||
+	    (vma->vm_flags & VM_EXEC)) {
+		local_irq_save(flags);
+		cpu_dcache_wbinval_page((unsigned long)page_address(page));
+		local_irq_restore(flags);
+	}
+}
+#endif
diff --git a/arch/nds32/mm/extable.c b/arch/nds32/mm/extable.c
new file mode 100644
index 0000000..db7f0a7
--- /dev/null
+++ b/arch/nds32/mm/extable.c
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/extable.h>
+#include <linux/uaccess.h>
+
+int fixup_exception(struct pt_regs *regs)
+{
+	const struct exception_table_entry *fixup;
+
+	fixup = search_exception_tables(instruction_pointer(regs));
+	if (fixup)
+		regs->ipc = fixup->fixup;
+
+	return fixup != NULL;
+}
diff --git a/arch/nds32/mm/fault.c b/arch/nds32/mm/fault.c
new file mode 100644
index 0000000..3a246fb
--- /dev/null
+++ b/arch/nds32/mm/fault.c
@@ -0,0 +1,410 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/extable.h>
+#include <linux/module.h>
+#include <linux/signal.h>
+#include <linux/ptrace.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/hardirq.h>
+#include <linux/uaccess.h>
+
+#include <asm/pgtable.h>
+#include <asm/tlbflush.h>
+
+extern void die(const char *str, struct pt_regs *regs, long err);
+
+/*
+ * This is useful to dump out the page tables associated with
+ * 'addr' in mm 'mm'.
+ */
+void show_pte(struct mm_struct *mm, unsigned long addr)
+{
+	pgd_t *pgd;
+	if (!mm)
+		mm = &init_mm;
+
+	pr_alert("pgd = %p\n", mm->pgd);
+	pgd = pgd_offset(mm, addr);
+	pr_alert("[%08lx] *pgd=%08lx", addr, pgd_val(*pgd));
+
+	do {
+		pmd_t *pmd;
+
+		if (pgd_none(*pgd))
+			break;
+
+		if (pgd_bad(*pgd)) {
+			pr_alert("(bad)");
+			break;
+		}
+
+		pmd = pmd_offset(pgd, addr);
+#if PTRS_PER_PMD != 1
+		pr_alert(", *pmd=%08lx", pmd_val(*pmd));
+#endif
+
+		if (pmd_none(*pmd))
+			break;
+
+		if (pmd_bad(*pmd)) {
+			pr_alert("(bad)");
+			break;
+		}
+
+		if (IS_ENABLED(CONFIG_HIGHMEM))
+		{
+			pte_t *pte;
+			/* We must not map this if we have highmem enabled */
+			pte = pte_offset_map(pmd, addr);
+			pr_alert(", *pte=%08lx", pte_val(*pte));
+			pte_unmap(pte);
+		}
+	} while (0);
+
+	pr_alert("\n");
+}
+
+void do_page_fault(unsigned long entry, unsigned long addr,
+		   unsigned int error_code, struct pt_regs *regs)
+{
+	struct task_struct *tsk;
+	struct mm_struct *mm;
+	struct vm_area_struct *vma;
+	siginfo_t info;
+	int fault;
+	unsigned int mask = VM_READ | VM_WRITE | VM_EXEC;
+	unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
+
+	error_code = error_code & (ITYPE_mskINST | ITYPE_mskETYPE);
+	tsk = current;
+	mm = tsk->mm;
+	info.si_code = SEGV_MAPERR;
+	/*
+	 * We fault-in kernel-space virtual memory on-demand. The
+	 * 'reference' page table is init_mm.pgd.
+	 *
+	 * NOTE! We MUST NOT take any locks for this case. We may
+	 * be in an interrupt or a critical region, and should
+	 * only copy the information from the master page table,
+	 * nothing more.
+	 */
+	if (addr >= TASK_SIZE) {
+		if (user_mode(regs))
+			goto bad_area_nosemaphore;
+
+		if (addr >= TASK_SIZE && addr < VMALLOC_END
+		    && (entry == ENTRY_PTE_NOT_PRESENT))
+			goto vmalloc_fault;
+		else
+			goto no_context;
+	}
+
+	/* Send a signal to the task for handling the unalignment access. */
+	if (entry == ENTRY_GENERAL_EXCPETION
+	    && error_code == ETYPE_ALIGNMENT_CHECK) {
+		if (user_mode(regs))
+			goto bad_area_nosemaphore;
+		else
+			goto no_context;
+	}
+
+	/*
+	 * If we're in an interrupt or have no user
+	 * context, we must not take the fault..
+	 */
+	if (unlikely(faulthandler_disabled() || !mm))
+		goto no_context;
+
+	/*
+	 * As per x86, we may deadlock here. However, since the kernel only
+	 * validly references user space from well defined areas of the code,
+	 * we can bug out early if this is from code which shouldn't.
+	 */
+	if (unlikely(!down_read_trylock(&mm->mmap_sem))) {
+		if (!user_mode(regs) &&
+		    !search_exception_tables(instruction_pointer(regs)))
+			goto no_context;
+retry:
+		down_read(&mm->mmap_sem);
+	} else {
+		/*
+		 * The above down_read_trylock() might have succeeded in which
+		 * case, we'll have missed the might_sleep() from down_read().
+		 */
+		might_sleep();
+		if (IS_ENABLED(CONFIG_DEBUG_VM)) {
+			if (!user_mode(regs) &&
+			    !search_exception_tables(instruction_pointer(regs)))
+				goto no_context;
+		}
+	}
+
+	vma = find_vma(mm, addr);
+
+	if (unlikely(!vma))
+		goto bad_area;
+
+	if (vma->vm_start <= addr)
+		goto good_area;
+
+	if (unlikely(!(vma->vm_flags & VM_GROWSDOWN)))
+		goto bad_area;
+
+	if (unlikely(expand_stack(vma, addr)))
+		goto bad_area;
+
+	/*
+	 * Ok, we have a good vm_area for this memory access, so
+	 * we can handle it..
+	 */
+
+good_area:
+	info.si_code = SEGV_ACCERR;
+
+	/* first do some preliminary protection checks */
+	if (entry == ENTRY_PTE_NOT_PRESENT) {
+		if (error_code & ITYPE_mskINST)
+			mask = VM_EXEC;
+		else {
+			mask = VM_READ | VM_WRITE;
+			if (vma->vm_flags & VM_WRITE)
+				flags |= FAULT_FLAG_WRITE;
+		}
+	} else if (entry == ENTRY_TLB_MISC) {
+		switch (error_code & ITYPE_mskETYPE) {
+		case RD_PROT:
+			mask = VM_READ;
+			break;
+		case WRT_PROT:
+			mask = VM_WRITE;
+			flags |= FAULT_FLAG_WRITE;
+			break;
+		case NOEXEC:
+			mask = VM_EXEC;
+			break;
+		case PAGE_MODIFY:
+			mask = VM_WRITE;
+			flags |= FAULT_FLAG_WRITE;
+			break;
+		case ACC_BIT:
+			BUG();
+		default:
+			break;
+		}
+
+	}
+	if (!(vma->vm_flags & mask))
+		goto bad_area;
+
+	/*
+	 * If for any reason at all we couldn't handle the fault,
+	 * make sure we exit gracefully rather than endlessly redo
+	 * the fault.
+	 */
+
+	fault = handle_mm_fault(vma, addr, flags);
+
+	/*
+	 * If we need to retry but a fatal signal is pending, handle the
+	 * signal first. We do not need to release the mmap_sem because it
+	 * would already be released in __lock_page_or_retry in mm/filemap.c.
+	 */
+	if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current)) {
+		if (!user_mode(regs))
+			goto no_context;
+		return;
+	}
+
+	if (unlikely(fault & VM_FAULT_ERROR)) {
+		if (fault & VM_FAULT_OOM)
+			goto out_of_memory;
+		else if (fault & VM_FAULT_SIGBUS)
+			goto do_sigbus;
+		else
+			goto bad_area;
+	}
+
+	/*
+	 * Major/minor page fault accounting is only done on the initial
+	 * attempt. If we go through a retry, it is extremely likely that the
+	 * page will be found in page cache at that point.
+	 */
+	if (flags & FAULT_FLAG_ALLOW_RETRY) {
+		if (fault & VM_FAULT_MAJOR)
+			tsk->maj_flt++;
+		else
+			tsk->min_flt++;
+		if (fault & VM_FAULT_RETRY) {
+			flags &= ~FAULT_FLAG_ALLOW_RETRY;
+			flags |= FAULT_FLAG_TRIED;
+
+			/* No need to up_read(&mm->mmap_sem) as we would
+			 * have already released it in __lock_page_or_retry
+			 * in mm/filemap.c.
+			 */
+			goto retry;
+		}
+	}
+
+	up_read(&mm->mmap_sem);
+	return;
+
+	/*
+	 * Something tried to access memory that isn't in our memory map..
+	 * Fix it, but check if it's kernel or user first..
+	 */
+bad_area:
+	up_read(&mm->mmap_sem);
+
+bad_area_nosemaphore:
+
+	/* User mode accesses just cause a SIGSEGV */
+
+	if (user_mode(regs)) {
+		tsk->thread.address = addr;
+		tsk->thread.error_code = error_code;
+		tsk->thread.trap_no = entry;
+		info.si_signo = SIGSEGV;
+		info.si_errno = 0;
+		/* info.si_code has been set above */
+		info.si_addr = (void *)addr;
+		force_sig_info(SIGSEGV, &info, tsk);
+		return;
+	}
+
+no_context:
+
+	/* Are we prepared to handle this kernel fault?
+	 *
+	 * (The kernel has valid exception-points in the source
+	 *  when it acesses user-memory. When it fails in one
+	 *  of those points, we find it in a table and do a jump
+	 *  to some fixup code that loads an appropriate error
+	 *  code)
+	 */
+
+	{
+		const struct exception_table_entry *entry;
+
+		if ((entry =
+		     search_exception_tables(instruction_pointer(regs))) !=
+		    NULL) {
+			/* Adjust the instruction pointer in the stackframe */
+			instruction_pointer(regs) = entry->fixup;
+			return;
+		}
+	}
+
+	/*
+	 * Oops. The kernel tried to access some bad page. We'll have to
+	 * terminate things with extreme prejudice.
+	 */
+
+	bust_spinlocks(1);
+	pr_alert("Unable to handle kernel %s at virtual address %08lx\n",
+		 (addr < PAGE_SIZE) ? "NULL pointer dereference" :
+		 "paging request", addr);
+
+	show_pte(mm, addr);
+	die("Oops", regs, error_code);
+	bust_spinlocks(0);
+	do_exit(SIGKILL);
+
+	return;
+
+	/*
+	 * We ran out of memory, or some other thing happened to us that made
+	 * us unable to handle the page fault gracefully.
+	 */
+
+out_of_memory:
+	up_read(&mm->mmap_sem);
+	if (!user_mode(regs))
+		goto no_context;
+	pagefault_out_of_memory();
+	return;
+
+do_sigbus:
+	up_read(&mm->mmap_sem);
+
+	/* Kernel mode? Handle exceptions or die */
+	if (!user_mode(regs))
+		goto no_context;
+
+	/*
+	 * Send a sigbus
+	 */
+	tsk->thread.address = addr;
+	tsk->thread.error_code = error_code;
+	tsk->thread.trap_no = entry;
+	info.si_signo = SIGBUS;
+	info.si_errno = 0;
+	info.si_code = BUS_ADRERR;
+	info.si_addr = (void *)addr;
+	force_sig_info(SIGBUS, &info, tsk);
+
+	return;
+
+vmalloc_fault:
+	{
+		/*
+		 * Synchronize this task's top level page-table
+		 * with the 'reference' page table.
+		 *
+		 * Use current_pgd instead of tsk->active_mm->pgd
+		 * since the latter might be unavailable if this
+		 * code is executed in a misfortunately run irq
+		 * (like inside schedule() between switch_mm and
+		 *  switch_to...).
+		 */
+
+		unsigned int index = pgd_index(addr);
+		pgd_t *pgd, *pgd_k;
+		pud_t *pud, *pud_k;
+		pmd_t *pmd, *pmd_k;
+		pte_t *pte_k;
+
+		pgd = (pgd_t *) __va(__nds32__mfsr(NDS32_SR_L1_PPTB)) + index;
+		pgd_k = init_mm.pgd + index;
+
+		if (!pgd_present(*pgd_k))
+			goto no_context;
+
+		pud = pud_offset(pgd, addr);
+		pud_k = pud_offset(pgd_k, addr);
+		if (!pud_present(*pud_k))
+			goto no_context;
+
+		pmd = pmd_offset(pud, addr);
+		pmd_k = pmd_offset(pud_k, addr);
+		if (!pmd_present(*pmd_k))
+			goto no_context;
+
+		if (!pmd_present(*pmd))
+			set_pmd(pmd, *pmd_k);
+		else
+			BUG_ON(pmd_page(*pmd) != pmd_page(*pmd_k));
+
+		/*
+		 * Since the vmalloc area is global, we don't
+		 * need to copy individual PTE's, it is enough to
+		 * copy the pgd pointer into the pte page of the
+		 * root task. If that is there, we'll find our pte if
+		 * it exists.
+		 */
+
+		/* Make sure the actual PTE exists as well to
+		 * catch kernel vmalloc-area accesses to non-mapped
+		 * addres. If we don't do this, this will just
+		 * silently loop forever.
+		 */
+
+		pte_k = pte_offset_kernel(pmd_k, addr);
+		if (!pte_present(*pte_k))
+			goto no_context;
+
+		return;
+	}
+}
diff --git a/arch/nds32/mm/highmem.c b/arch/nds32/mm/highmem.c
new file mode 100644
index 0000000..e17cb8a
--- /dev/null
+++ b/arch/nds32/mm/highmem.c
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/export.h>
+#include <linux/highmem.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/interrupt.h>
+#include <linux/bootmem.h>
+#include <asm/fixmap.h>
+#include <asm/tlbflush.h>
+
+void *kmap(struct page *page)
+{
+	unsigned long vaddr;
+	might_sleep();
+	if (!PageHighMem(page))
+		return page_address(page);
+	vaddr = (unsigned long)kmap_high(page);
+	return (void *)vaddr;
+}
+
+EXPORT_SYMBOL(kmap);
+
+void kunmap(struct page *page)
+{
+	BUG_ON(in_interrupt());
+	if (!PageHighMem(page))
+		return;
+	kunmap_high(page);
+}
+
+EXPORT_SYMBOL(kunmap);
+
+void *kmap_atomic(struct page *page)
+{
+	unsigned int idx;
+	unsigned long vaddr, pte;
+	int type;
+	pte_t *ptep;
+
+	preempt_disable();
+	pagefault_disable();
+	if (!PageHighMem(page))
+		return page_address(page);
+
+	type = kmap_atomic_idx_push();
+
+	idx = type + KM_TYPE_NR * smp_processor_id();
+	vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
+	pte = (page_to_pfn(page) << PAGE_SHIFT) | (PAGE_KERNEL);
+	ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
+	set_pte(ptep, pte);
+
+	__nds32__tlbop_inv(vaddr);
+	__nds32__mtsr_dsb(vaddr, NDS32_SR_TLB_VPN);
+	__nds32__tlbop_rwr(pte);
+	__nds32__isb();
+	return (void *)vaddr;
+}
+
+EXPORT_SYMBOL(kmap_atomic);
+
+void __kunmap_atomic(void *kvaddr)
+{
+	if (kvaddr >= (void *)FIXADDR_START) {
+		unsigned long vaddr = (unsigned long)kvaddr;
+		pte_t *ptep;
+		kmap_atomic_idx_pop();
+		__nds32__tlbop_inv(vaddr);
+		__nds32__isb();
+		ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
+		set_pte(ptep, 0);
+	}
+	pagefault_enable();
+	preempt_enable();
+}
+
+EXPORT_SYMBOL(__kunmap_atomic);
diff --git a/arch/nds32/mm/init.c b/arch/nds32/mm/init.c
new file mode 100644
index 0000000..93ee016
--- /dev/null
+++ b/arch/nds32/mm/init.c
@@ -0,0 +1,277 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 1995-2005 Russell King
+// Copyright (C) 2012 ARM Ltd.
+// Copyright (C) 2013-2017 Andes Technology Corporation
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/swap.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/mman.h>
+#include <linux/nodemask.h>
+#include <linux/initrd.h>
+#include <linux/highmem.h>
+#include <linux/memblock.h>
+
+#include <asm/sections.h>
+#include <asm/setup.h>
+#include <asm/tlb.h>
+#include <asm/page.h>
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+DEFINE_SPINLOCK(anon_alias_lock);
+extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
+extern unsigned long phys_initrd_start;
+extern unsigned long phys_initrd_size;
+
+/*
+ * empty_zero_page is a special page that is used for
+ * zero-initialized data and COW.
+ */
+struct page *empty_zero_page;
+
+static void __init zone_sizes_init(void)
+{
+	unsigned long zones_size[MAX_NR_ZONES];
+
+	/* Clear the zone sizes */
+	memset(zones_size, 0, sizeof(zones_size));
+
+	zones_size[ZONE_NORMAL] = max_low_pfn;
+#ifdef CONFIG_HIGHMEM
+	zones_size[ZONE_HIGHMEM] = max_pfn;
+#endif
+	free_area_init(zones_size);
+
+}
+
+/*
+ * Map all physical memory under high_memory into kernel's address space.
+ *
+ * This is explicitly coded for two-level page tables, so if you need
+ * something else then this needs to change.
+ */
+static void __init map_ram(void)
+{
+	unsigned long v, p, e;
+	pgd_t *pge;
+	pud_t *pue;
+	pmd_t *pme;
+	pte_t *pte;
+	/* These mark extents of read-only kernel pages...
+	 * ...from vmlinux.lds.S
+	 */
+
+	p = (u32) memblock_start_of_DRAM() & PAGE_MASK;
+	e = min((u32) memblock_end_of_DRAM(), (u32) __pa(high_memory));
+
+	v = (u32) __va(p);
+	pge = pgd_offset_k(v);
+
+	while (p < e) {
+		int j;
+		pue = pud_offset(pge, v);
+		pme = pmd_offset(pue, v);
+
+		if ((u32) pue != (u32) pge || (u32) pme != (u32) pge) {
+			panic("%s: Kernel hardcoded for "
+			      "two-level page tables", __func__);
+		}
+
+		/* Alloc one page for holding PTE's... */
+		pte = (pte_t *) __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE));
+		memset(pte, 0, PAGE_SIZE);
+		set_pmd(pme, __pmd(__pa(pte) + _PAGE_KERNEL_TABLE));
+
+		/* Fill the newly allocated page with PTE'S */
+		for (j = 0; p < e && j < PTRS_PER_PTE;
+		     v += PAGE_SIZE, p += PAGE_SIZE, j++, pte++) {
+			/* Create mapping between p and v. */
+			/* TODO: more fine grant for page access permission */
+			set_pte(pte, __pte(p + pgprot_val(PAGE_KERNEL)));
+		}
+
+		pge++;
+	}
+}
+static pmd_t *fixmap_pmd_p;
+static void __init fixedrange_init(void)
+{
+	unsigned long vaddr;
+	pgd_t *pgd;
+	pud_t *pud;
+	pmd_t *pmd;
+#ifdef CONFIG_HIGHMEM
+	pte_t *pte;
+#endif /* CONFIG_HIGHMEM */
+
+	/*
+	 * Fixed mappings:
+	 */
+	vaddr = __fix_to_virt(__end_of_fixed_addresses - 1);
+	pgd = swapper_pg_dir + pgd_index(vaddr);
+	pud = pud_offset(pgd, vaddr);
+	pmd = pmd_offset(pud, vaddr);
+	fixmap_pmd_p = (pmd_t *) __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE));
+	memset(fixmap_pmd_p, 0, PAGE_SIZE);
+	set_pmd(pmd, __pmd(__pa(fixmap_pmd_p) + _PAGE_KERNEL_TABLE));
+
+#ifdef CONFIG_HIGHMEM
+	/*
+	 * Permanent kmaps:
+	 */
+	vaddr = PKMAP_BASE;
+
+	pgd = swapper_pg_dir + pgd_index(vaddr);
+	pud = pud_offset(pgd, vaddr);
+	pmd = pmd_offset(pud, vaddr);
+	pte = (pte_t *) __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE));
+	memset(pte, 0, PAGE_SIZE);
+	set_pmd(pmd, __pmd(__pa(pte) + _PAGE_KERNEL_TABLE));
+	pkmap_page_table = pte;
+#endif /* CONFIG_HIGHMEM */
+}
+
+/*
+ * paging_init() sets up the page tables, initialises the zone memory
+ * maps, and sets up the zero page, bad page and bad page tables.
+ */
+void __init paging_init(void)
+{
+	int i;
+	void *zero_page;
+
+	pr_info("Setting up paging and PTEs.\n");
+	/* clear out the init_mm.pgd that will contain the kernel's mappings */
+	for (i = 0; i < PTRS_PER_PGD; i++)
+		swapper_pg_dir[i] = __pgd(1);
+
+	map_ram();
+
+	fixedrange_init();
+
+	/* allocate space for empty_zero_page */
+	zero_page = __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE));
+	memset(zero_page, 0, PAGE_SIZE);
+	zone_sizes_init();
+
+	empty_zero_page = virt_to_page(zero_page);
+	flush_dcache_page(empty_zero_page);
+}
+
+static inline void __init free_highmem(void)
+{
+#ifdef CONFIG_HIGHMEM
+	unsigned long pfn;
+	for (pfn = PFN_UP(__pa(high_memory)); pfn < max_pfn; pfn++) {
+		phys_addr_t paddr = (phys_addr_t) pfn << PAGE_SHIFT;
+		if (!memblock_is_reserved(paddr))
+			free_highmem_page(pfn_to_page(pfn));
+	}
+#endif
+}
+
+static void __init set_max_mapnr_init(void)
+{
+	max_mapnr = max_pfn;
+}
+
+/*
+ * mem_init() marks the free areas in the mem_map and tells us how much
+ * memory is free.  This is done after various parts of the system have
+ * claimed their memory after the kernel image.
+ */
+void __init mem_init(void)
+{
+	phys_addr_t memory_start = memblock_start_of_DRAM();
+	BUG_ON(!mem_map);
+	set_max_mapnr_init();
+
+	free_highmem();
+
+	/* this will put all low memory onto the freelists */
+	free_all_bootmem();
+	mem_init_print_info(NULL);
+
+	pr_info("virtual kernel memory layout:\n"
+		"    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
+#ifdef CONFIG_HIGHMEM
+		"    pkmap   : 0x%08lx - 0x%08lx   (%4ld kB)\n"
+#endif
+		"    consist : 0x%08lx - 0x%08lx   (%4ld MB)\n"
+		"    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
+		"    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
+		"      .init : 0x%08lx - 0x%08lx   (%4ld kB)\n"
+		"      .data : 0x%08lx - 0x%08lx   (%4ld kB)\n"
+		"      .text : 0x%08lx - 0x%08lx   (%4ld kB)\n",
+		FIXADDR_START, FIXADDR_TOP, (FIXADDR_TOP - FIXADDR_START) >> 10,
+#ifdef CONFIG_HIGHMEM
+		PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE,
+		(LAST_PKMAP * PAGE_SIZE) >> 10,
+#endif
+		CONSISTENT_BASE, CONSISTENT_END,
+		((CONSISTENT_END) - (CONSISTENT_BASE)) >> 20, VMALLOC_START,
+		(unsigned long)VMALLOC_END, (VMALLOC_END - VMALLOC_START) >> 20,
+		(unsigned long)__va(memory_start), (unsigned long)high_memory,
+		((unsigned long)high_memory -
+		 (unsigned long)__va(memory_start)) >> 20,
+		(unsigned long)&__init_begin, (unsigned long)&__init_end,
+		((unsigned long)&__init_end -
+		 (unsigned long)&__init_begin) >> 10, (unsigned long)&_etext,
+		(unsigned long)&_edata,
+		((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
+		(unsigned long)&_text, (unsigned long)&_etext,
+		((unsigned long)&_etext - (unsigned long)&_text) >> 10);
+
+	/*
+	 * Check boundaries twice: Some fundamental inconsistencies can
+	 * be detected at build time already.
+	 */
+#ifdef CONFIG_HIGHMEM
+	BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > FIXADDR_START);
+	BUILD_BUG_ON((CONSISTENT_END) > PKMAP_BASE);
+#endif
+	BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE);
+	BUILD_BUG_ON(VMALLOC_START >= VMALLOC_END);
+
+#ifdef CONFIG_HIGHMEM
+	BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > FIXADDR_START);
+	BUG_ON(CONSISTENT_END > PKMAP_BASE);
+#endif
+	BUG_ON(VMALLOC_END > CONSISTENT_BASE);
+	BUG_ON(VMALLOC_START >= VMALLOC_END);
+	BUG_ON((unsigned long)high_memory > VMALLOC_START);
+
+	return;
+}
+
+void free_initmem(void)
+{
+	free_initmem_default(-1);
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+	free_reserved_area((void *)start, (void *)end, -1, "initrd");
+}
+#endif
+
+void __set_fixmap(enum fixed_addresses idx,
+			       phys_addr_t phys, pgprot_t flags)
+{
+	unsigned long addr = __fix_to_virt(idx);
+	pte_t *pte;
+
+	BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
+
+	pte = (pte_t *)&fixmap_pmd_p[pte_index(addr)];;
+
+	if (pgprot_val(flags)) {
+		set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags));
+	} else {
+		pte_clear(&init_mm, addr, pte);
+		flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
+	}
+}
diff --git a/arch/nds32/mm/ioremap.c b/arch/nds32/mm/ioremap.c
new file mode 100644
index 0000000..690140b
--- /dev/null
+++ b/arch/nds32/mm/ioremap.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/vmalloc.h>
+#include <linux/io.h>
+#include <linux/mm.h>
+#include <asm/pgtable.h>
+
+void __iomem *ioremap(phys_addr_t phys_addr, size_t size);
+
+static void __iomem *__ioremap_caller(phys_addr_t phys_addr, size_t size,
+				      void *caller)
+{
+	struct vm_struct *area;
+	unsigned long addr, offset, last_addr;
+	pgprot_t prot;
+
+	/* Don't allow wraparound or zero size */
+	last_addr = phys_addr + size - 1;
+	if (!size || last_addr < phys_addr)
+		return NULL;
+
+	/*
+	 * Mappings have to be page-aligned
+	 */
+	offset = phys_addr & ~PAGE_MASK;
+	phys_addr &= PAGE_MASK;
+	size = PAGE_ALIGN(last_addr + 1) - phys_addr;
+
+	/*
+	 * Ok, go for it..
+	 */
+	area = get_vm_area_caller(size, VM_IOREMAP, caller);
+	if (!area)
+		return NULL;
+
+	area->phys_addr = phys_addr;
+	addr = (unsigned long)area->addr;
+	prot = __pgprot(_PAGE_V | _PAGE_M_KRW | _PAGE_D |
+			_PAGE_G | _PAGE_C_DEV);
+	if (ioremap_page_range(addr, addr + size, phys_addr, prot)) {
+		vunmap((void *)addr);
+		return NULL;
+	}
+	return (__force void __iomem *)(offset + (char *)addr);
+
+}
+
+void __iomem *ioremap(phys_addr_t phys_addr, size_t size)
+{
+	return __ioremap_caller(phys_addr, size,
+				__builtin_return_address(0));
+}
+
+EXPORT_SYMBOL(ioremap);
+
+void iounmap(volatile void __iomem * addr)
+{
+	vunmap((void *)(PAGE_MASK & (unsigned long)addr));
+}
+
+EXPORT_SYMBOL(iounmap);
diff --git a/arch/nds32/mm/mm-nds32.c b/arch/nds32/mm/mm-nds32.c
new file mode 100644
index 0000000..3b43798
--- /dev/null
+++ b/arch/nds32/mm/mm-nds32.c
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/init_task.h>
+#include <asm/pgalloc.h>
+
+#define FIRST_KERNEL_PGD_NR	(USER_PTRS_PER_PGD)
+
+/*
+ * need to get a page for level 1
+ */
+
+pgd_t *pgd_alloc(struct mm_struct *mm)
+{
+	pgd_t *new_pgd, *init_pgd;
+	int i;
+
+	new_pgd = (pgd_t *) __get_free_pages(GFP_KERNEL, 0);
+	if (!new_pgd)
+		return NULL;
+	for (i = 0; i < PTRS_PER_PGD; i++) {
+		(*new_pgd) = 1;
+		new_pgd++;
+	}
+	new_pgd -= PTRS_PER_PGD;
+
+	init_pgd = pgd_offset_k(0);
+
+	memcpy(new_pgd + FIRST_KERNEL_PGD_NR, init_pgd + FIRST_KERNEL_PGD_NR,
+	       (PTRS_PER_PGD - FIRST_KERNEL_PGD_NR) * sizeof(pgd_t));
+
+	cpu_dcache_wb_range((unsigned long)new_pgd,
+			    (unsigned long)new_pgd +
+			    PTRS_PER_PGD * sizeof(pgd_t));
+	inc_zone_page_state(virt_to_page((unsigned long *)new_pgd),
+			    NR_PAGETABLE);
+
+	return new_pgd;
+}
+
+void pgd_free(struct mm_struct *mm, pgd_t * pgd)
+{
+	pmd_t *pmd;
+	struct page *pte;
+
+	if (!pgd)
+		return;
+
+	pmd = (pmd_t *) pgd;
+	if (pmd_none(*pmd))
+		goto free;
+	if (pmd_bad(*pmd)) {
+		pmd_ERROR(*pmd);
+		pmd_clear(pmd);
+		goto free;
+	}
+
+	pte = pmd_page(*pmd);
+	pmd_clear(pmd);
+	dec_zone_page_state(virt_to_page((unsigned long *)pgd), NR_PAGETABLE);
+	pte_free(mm, pte);
+	mm_dec_nr_ptes(mm);
+	pmd_free(mm, pmd);
+free:
+	free_pages((unsigned long)pgd, 0);
+}
+
+/*
+ * In order to soft-boot, we need to insert a 1:1 mapping in place of
+ * the user-mode pages.  This will then ensure that we have predictable
+ * results when turning the mmu off
+ */
+void setup_mm_for_reboot(char mode)
+{
+	unsigned long pmdval;
+	pgd_t *pgd;
+	pmd_t *pmd;
+	int i;
+
+	if (current->mm && current->mm->pgd)
+		pgd = current->mm->pgd;
+	else
+		pgd = init_mm.pgd;
+
+	for (i = 0; i < USER_PTRS_PER_PGD; i++) {
+		pmdval = (i << PGDIR_SHIFT);
+		pmd = pmd_offset(pgd + i, i << PGDIR_SHIFT);
+		set_pmd(pmd, __pmd(pmdval));
+	}
+}
diff --git a/arch/nds32/mm/mmap.c b/arch/nds32/mm/mmap.c
new file mode 100644
index 0000000..c206b31
--- /dev/null
+++ b/arch/nds32/mm/mmap.c
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/sched.h>
+#include <linux/mman.h>
+#include <linux/shm.h>
+
+#define COLOUR_ALIGN(addr,pgoff)		\
+	((((addr)+SHMLBA-1)&~(SHMLBA-1)) +	\
+	 (((pgoff)<<PAGE_SHIFT) & (SHMLBA-1)))
+
+/*
+ * We need to ensure that shared mappings are correctly aligned to
+ * avoid aliasing issues with VIPT caches.  We need to ensure that
+ * a specific page of an object is always mapped at a multiple of
+ * SHMLBA bytes.
+ *
+ * We unconditionally provide this function for all cases, however
+ * in the VIVT case, we optimise out the alignment rules.
+ */
+unsigned long
+arch_get_unmapped_area(struct file *filp, unsigned long addr,
+		       unsigned long len, unsigned long pgoff,
+		       unsigned long flags)
+{
+	struct mm_struct *mm = current->mm;
+	struct vm_area_struct *vma;
+	int do_align = 0;
+	struct vm_unmapped_area_info info;
+	int aliasing = 0;
+	if(IS_ENABLED(CONFIG_CPU_CACHE_ALIASING))
+		aliasing = 1;
+
+	/*
+	 * We only need to do colour alignment if either the I or D
+	 * caches alias.
+	 */
+	if (aliasing)
+		do_align = filp || (flags & MAP_SHARED);
+
+	/*
+	 * We enforce the MAP_FIXED case.
+	 */
+	if (flags & MAP_FIXED) {
+		if (aliasing && flags & MAP_SHARED &&
+		    (addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))
+			return -EINVAL;
+		return addr;
+	}
+
+	if (len > TASK_SIZE)
+		return -ENOMEM;
+
+	if (addr) {
+		if (do_align)
+			addr = COLOUR_ALIGN(addr, pgoff);
+		else
+			addr = PAGE_ALIGN(addr);
+
+		vma = find_vma(mm, addr);
+		if (TASK_SIZE - len >= addr &&
+		    (!vma || addr + len <= vma->vm_start))
+			return addr;
+	}
+
+	info.flags = 0;
+	info.length = len;
+	info.low_limit = mm->mmap_base;
+	info.high_limit = TASK_SIZE;
+	info.align_mask = do_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
+	info.align_offset = pgoff << PAGE_SHIFT;
+	return vm_unmapped_area(&info);
+}
diff --git a/arch/nds32/mm/proc.c b/arch/nds32/mm/proc.c
new file mode 100644
index 0000000..ba80992
--- /dev/null
+++ b/arch/nds32/mm/proc.c
@@ -0,0 +1,533 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <asm/nds32.h>
+#include <asm/pgtable.h>
+#include <asm/tlbflush.h>
+#include <asm/cacheflush.h>
+#include <asm/l2_cache.h>
+#include <nds32_intrinsic.h>
+
+#include <asm/cache_info.h>
+extern struct cache_info L1_cache_info[2];
+
+int va_kernel_present(unsigned long addr)
+{
+	pmd_t *pmd;
+	pte_t *ptep, pte;
+
+	pmd = pmd_offset(pgd_offset_k(addr), addr);
+	if (!pmd_none(*pmd)) {
+		ptep = pte_offset_map(pmd, addr);
+		pte = *ptep;
+		if (pte_present(pte))
+			return pte;
+	}
+	return 0;
+}
+
+pte_t va_present(struct mm_struct * mm, unsigned long addr)
+{
+	pgd_t *pgd;
+	pud_t *pud;
+	pmd_t *pmd;
+	pte_t *ptep, pte;
+
+	pgd = pgd_offset(mm, addr);
+	if (!pgd_none(*pgd)) {
+		pud = pud_offset(pgd, addr);
+		if (!pud_none(*pud)) {
+			pmd = pmd_offset(pud, addr);
+			if (!pmd_none(*pmd)) {
+				ptep = pte_offset_map(pmd, addr);
+				pte = *ptep;
+				if (pte_present(pte))
+					return pte;
+			}
+		}
+	}
+	return 0;
+
+}
+
+int va_readable(struct pt_regs *regs, unsigned long addr)
+{
+	struct mm_struct *mm = current->mm;
+	pte_t pte;
+	int ret = 0;
+
+	if (user_mode(regs)) {
+		/* user mode */
+		pte = va_present(mm, addr);
+		if (!pte && pte_read(pte))
+			ret = 1;
+	} else {
+		/* superuser mode is always readable, so we can only
+		 * check it is present or not*/
+		return (! !va_kernel_present(addr));
+	}
+	return ret;
+}
+
+int va_writable(struct pt_regs *regs, unsigned long addr)
+{
+	struct mm_struct *mm = current->mm;
+	pte_t pte;
+	int ret = 0;
+
+	if (user_mode(regs)) {
+		/* user mode */
+		pte = va_present(mm, addr);
+		if (!pte && pte_write(pte))
+			ret = 1;
+	} else {
+		/* superuser mode */
+		pte = va_kernel_present(addr);
+		if (!pte && pte_kernel_write(pte))
+			ret = 1;
+	}
+	return ret;
+}
+
+/*
+ * All
+ */
+void cpu_icache_inval_all(void)
+{
+	unsigned long end, line_size;
+
+	line_size = L1_cache_info[ICACHE].line_size;
+	end =
+	    line_size * L1_cache_info[ICACHE].ways * L1_cache_info[ICACHE].sets;
+
+	do {
+		end -= line_size;
+		__asm__ volatile ("\n\tcctl %0, L1I_IX_INVAL"::"r" (end));
+		end -= line_size;
+		__asm__ volatile ("\n\tcctl %0, L1I_IX_INVAL"::"r" (end));
+		end -= line_size;
+		__asm__ volatile ("\n\tcctl %0, L1I_IX_INVAL"::"r" (end));
+		end -= line_size;
+		__asm__ volatile ("\n\tcctl %0, L1I_IX_INVAL"::"r" (end));
+	} while (end > 0);
+	__nds32__isb();
+}
+
+void cpu_dcache_inval_all(void)
+{
+	__nds32__cctl_l1d_invalall();
+}
+
+#ifdef CONFIG_CACHE_L2
+void dcache_wb_all_level(void)
+{
+	unsigned long flags, cmd;
+	local_irq_save(flags);
+	__nds32__cctl_l1d_wball_alvl();
+	/* Section 1: Ensure the section 2 & 3 program code execution after */
+	__nds32__cctlidx_read(NDS32_CCTL_L1D_IX_RWD,0);
+
+	/* Section 2: Confirm the writeback all level is done in CPU and L2C */
+	cmd = CCTL_CMD_L2_SYNC;
+	L2_CMD_RDY();
+	L2C_W_REG(L2_CCTL_CMD_OFF, cmd);
+	L2_CMD_RDY();
+
+	/* Section 3: Writeback whole L2 cache */
+	cmd = CCTL_ALL_CMD | CCTL_CMD_L2_IX_WB;
+	L2_CMD_RDY();
+	L2C_W_REG(L2_CCTL_CMD_OFF, cmd);
+	L2_CMD_RDY();
+	__nds32__msync_all();
+	local_irq_restore(flags);
+}
+EXPORT_SYMBOL(dcache_wb_all_level);
+#endif
+
+void cpu_dcache_wb_all(void)
+{
+	__nds32__cctl_l1d_wball_one_lvl();
+	__nds32__cctlidx_read(NDS32_CCTL_L1D_IX_RWD,0);
+}
+
+void cpu_dcache_wbinval_all(void)
+{
+#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
+	unsigned long flags;
+	local_irq_save(flags);
+#endif
+	cpu_dcache_wb_all();
+	cpu_dcache_inval_all();
+#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
+	local_irq_restore(flags);
+#endif
+}
+
+/*
+ * Page
+ */
+void cpu_icache_inval_page(unsigned long start)
+{
+	unsigned long line_size, end;
+
+	line_size = L1_cache_info[ICACHE].line_size;
+	end = start + PAGE_SIZE;
+
+	do {
+		end -= line_size;
+		__asm__ volatile ("\n\tcctl %0, L1I_VA_INVAL"::"r" (end));
+		end -= line_size;
+		__asm__ volatile ("\n\tcctl %0, L1I_VA_INVAL"::"r" (end));
+		end -= line_size;
+		__asm__ volatile ("\n\tcctl %0, L1I_VA_INVAL"::"r" (end));
+		end -= line_size;
+		__asm__ volatile ("\n\tcctl %0, L1I_VA_INVAL"::"r" (end));
+	} while (end != start);
+	__nds32__isb();
+}
+
+void cpu_dcache_inval_page(unsigned long start)
+{
+	unsigned long line_size, end;
+
+	line_size = L1_cache_info[DCACHE].line_size;
+	end = start + PAGE_SIZE;
+
+	do {
+		end -= line_size;
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL"::"r" (end));
+		end -= line_size;
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL"::"r" (end));
+		end -= line_size;
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL"::"r" (end));
+		end -= line_size;
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL"::"r" (end));
+	} while (end != start);
+}
+
+void cpu_dcache_wb_page(unsigned long start)
+{
+#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
+	unsigned long line_size, end;
+
+	line_size = L1_cache_info[DCACHE].line_size;
+	end = start + PAGE_SIZE;
+
+	do {
+		end -= line_size;
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (end));
+		end -= line_size;
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (end));
+		end -= line_size;
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (end));
+		end -= line_size;
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (end));
+	} while (end != start);
+	__nds32__cctlidx_read(NDS32_CCTL_L1D_IX_RWD,0);
+#endif
+}
+
+void cpu_dcache_wbinval_page(unsigned long start)
+{
+	unsigned long line_size, end;
+
+	line_size = L1_cache_info[DCACHE].line_size;
+	end = start + PAGE_SIZE;
+
+	do {
+		end -= line_size;
+#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (end));
+#endif
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL"::"r" (end));
+		end -= line_size;
+#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (end));
+#endif
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL"::"r" (end));
+		end -= line_size;
+#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (end));
+#endif
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL"::"r" (end));
+		end -= line_size;
+#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (end));
+#endif
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL"::"r" (end));
+	} while (end != start);
+	__nds32__cctlidx_read(NDS32_CCTL_L1D_IX_RWD,0);
+}
+
+void cpu_cache_wbinval_page(unsigned long page, int flushi)
+{
+	cpu_dcache_wbinval_page(page);
+	if (flushi)
+		cpu_icache_inval_page(page);
+}
+
+/*
+ * Range
+ */
+void cpu_icache_inval_range(unsigned long start, unsigned long end)
+{
+	unsigned long line_size;
+
+	line_size = L1_cache_info[ICACHE].line_size;
+
+	while (end > start) {
+		__asm__ volatile ("\n\tcctl %0, L1I_VA_INVAL"::"r" (start));
+		start += line_size;
+	}
+	__nds32__isb();
+}
+
+void cpu_dcache_inval_range(unsigned long start, unsigned long end)
+{
+	unsigned long line_size;
+
+	line_size = L1_cache_info[DCACHE].line_size;
+
+	while (end > start) {
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL"::"r" (start));
+		start += line_size;
+	}
+}
+
+void cpu_dcache_wb_range(unsigned long start, unsigned long end)
+{
+#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
+	unsigned long line_size;
+
+	line_size = L1_cache_info[DCACHE].line_size;
+
+	while (end > start) {
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (start));
+		start += line_size;
+	}
+	__nds32__cctlidx_read(NDS32_CCTL_L1D_IX_RWD,0);
+#endif
+}
+
+void cpu_dcache_wbinval_range(unsigned long start, unsigned long end)
+{
+	unsigned long line_size;
+
+	line_size = L1_cache_info[DCACHE].line_size;
+
+	while (end > start) {
+#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_WB"::"r" (start));
+#endif
+		__asm__ volatile ("\n\tcctl %0, L1D_VA_INVAL"::"r" (start));
+		start += line_size;
+	}
+	__nds32__cctlidx_read(NDS32_CCTL_L1D_IX_RWD,0);
+}
+
+void cpu_cache_wbinval_range(unsigned long start, unsigned long end, int flushi)
+{
+	unsigned long line_size, align_start, align_end;
+
+	line_size = L1_cache_info[DCACHE].line_size;
+	align_start = start & ~(line_size - 1);
+	align_end = (end + line_size - 1) & ~(line_size - 1);
+	cpu_dcache_wbinval_range(align_start, align_end);
+
+	if (flushi) {
+		line_size = L1_cache_info[ICACHE].line_size;
+		align_start = start & ~(line_size - 1);
+		align_end = (end + line_size - 1) & ~(line_size - 1);
+		cpu_icache_inval_range(align_start, align_end);
+	}
+}
+
+void cpu_cache_wbinval_range_check(struct vm_area_struct *vma,
+				   unsigned long start, unsigned long end,
+				   bool flushi, bool wbd)
+{
+	unsigned long line_size, t_start, t_end;
+
+	if (!flushi && !wbd)
+		return;
+	line_size = L1_cache_info[DCACHE].line_size;
+	start = start & ~(line_size - 1);
+	end = (end + line_size - 1) & ~(line_size - 1);
+
+	if ((end - start) > (8 * PAGE_SIZE)) {
+		if (wbd)
+			cpu_dcache_wbinval_all();
+		if (flushi)
+			cpu_icache_inval_all();
+		return;
+	}
+
+	t_start = (start + PAGE_SIZE) & PAGE_MASK;
+	t_end = ((end - 1) & PAGE_MASK);
+
+	if ((start & PAGE_MASK) == t_end) {
+		if (va_present(vma->vm_mm, start)) {
+			if (wbd)
+				cpu_dcache_wbinval_range(start, end);
+			if (flushi)
+				cpu_icache_inval_range(start, end);
+		}
+		return;
+	}
+
+	if (va_present(vma->vm_mm, start)) {
+		if (wbd)
+			cpu_dcache_wbinval_range(start, t_start);
+		if (flushi)
+			cpu_icache_inval_range(start, t_start);
+	}
+
+	if (va_present(vma->vm_mm, end - 1)) {
+		if (wbd)
+			cpu_dcache_wbinval_range(t_end, end);
+		if (flushi)
+			cpu_icache_inval_range(t_end, end);
+	}
+
+	while (t_start < t_end) {
+		if (va_present(vma->vm_mm, t_start)) {
+			if (wbd)
+				cpu_dcache_wbinval_page(t_start);
+			if (flushi)
+				cpu_icache_inval_page(t_start);
+		}
+		t_start += PAGE_SIZE;
+	}
+}
+
+#ifdef CONFIG_CACHE_L2
+static inline void cpu_l2cache_op(unsigned long start, unsigned long end, unsigned long op)
+{
+	if (atl2c_base) {
+		unsigned long p_start = __pa(start);
+		unsigned long p_end = __pa(end);
+		unsigned long cmd;
+		unsigned long line_size;
+		/* TODO Can Use PAGE Mode to optimize if range large than PAGE_SIZE */
+		line_size = L2_CACHE_LINE_SIZE();
+		p_start = p_start & (~(line_size - 1));
+		p_end = (p_end + line_size - 1) & (~(line_size - 1));
+		cmd =
+		    (p_start & ~(line_size - 1)) | op |
+		    CCTL_SINGLE_CMD;
+		do {
+			L2_CMD_RDY();
+			L2C_W_REG(L2_CCTL_CMD_OFF, cmd);
+			cmd += line_size;
+			p_start += line_size;
+		} while (p_end > p_start);
+		cmd = CCTL_CMD_L2_SYNC;
+		L2_CMD_RDY();
+		L2C_W_REG(L2_CCTL_CMD_OFF, cmd);
+		L2_CMD_RDY();
+	}
+}
+#else
+#define cpu_l2cache_op(start,end,op) do { } while (0)
+#endif
+/*
+ * DMA
+ */
+void cpu_dma_wb_range(unsigned long start, unsigned long end)
+{
+	unsigned long line_size;
+	unsigned long flags;
+	line_size = L1_cache_info[DCACHE].line_size;
+	start = start & (~(line_size - 1));
+	end = (end + line_size - 1) & (~(line_size - 1));
+	if (unlikely(start == end))
+		return;
+
+	local_irq_save(flags);
+	cpu_dcache_wb_range(start, end);
+	cpu_l2cache_op(start, end, CCTL_CMD_L2_PA_WB);
+	__nds32__msync_all();
+	local_irq_restore(flags);
+}
+
+void cpu_dma_inval_range(unsigned long start, unsigned long end)
+{
+	unsigned long line_size;
+	unsigned long old_start = start;
+	unsigned long old_end = end;
+	unsigned long flags;
+	line_size = L1_cache_info[DCACHE].line_size;
+	start = start & (~(line_size - 1));
+	end = (end + line_size - 1) & (~(line_size - 1));
+	if (unlikely(start == end))
+		return;
+	local_irq_save(flags);
+	if (start != old_start) {
+		cpu_dcache_wbinval_range(start, start + line_size);
+		cpu_l2cache_op(start, start + line_size, CCTL_CMD_L2_PA_WBINVAL);
+	}
+	if (end != old_end) {
+		cpu_dcache_wbinval_range(end - line_size, end);
+		cpu_l2cache_op(end - line_size, end, CCTL_CMD_L2_PA_WBINVAL);
+	}
+	cpu_dcache_inval_range(start, end);
+	cpu_l2cache_op(start, end, CCTL_CMD_L2_PA_INVAL);
+	__nds32__msync_all();
+	local_irq_restore(flags);
+
+}
+
+void cpu_dma_wbinval_range(unsigned long start, unsigned long end)
+{
+	unsigned long line_size;
+	unsigned long flags;
+	line_size = L1_cache_info[DCACHE].line_size;
+	start = start & (~(line_size - 1));
+	end = (end + line_size - 1) & (~(line_size - 1));
+	if (unlikely(start == end))
+		return;
+
+	local_irq_save(flags);
+	cpu_dcache_wbinval_range(start, end);
+	cpu_l2cache_op(start, end, CCTL_CMD_L2_PA_WBINVAL);
+	__nds32__msync_all();
+	local_irq_restore(flags);
+}
+
+void cpu_proc_init(void)
+{
+}
+
+void cpu_proc_fin(void)
+{
+}
+
+void cpu_do_idle(void)
+{
+	__nds32__standby_no_wake_grant();
+}
+
+void cpu_reset(unsigned long reset)
+{
+	u32 tmp;
+	GIE_DISABLE();
+	tmp = __nds32__mfsr(NDS32_SR_CACHE_CTL);
+	tmp &= ~(CACHE_CTL_mskIC_EN | CACHE_CTL_mskDC_EN);
+	__nds32__mtsr_isb(tmp, NDS32_SR_CACHE_CTL);
+	cpu_dcache_wbinval_all();
+	cpu_icache_inval_all();
+
+	__asm__ __volatile__("jr.toff %0\n\t"::"r"(reset));
+}
+
+void cpu_switch_mm(struct mm_struct *mm)
+{
+	unsigned long cid;
+	cid = __nds32__mfsr(NDS32_SR_TLB_MISC);
+	cid = (cid & ~TLB_MISC_mskCID) | mm->context.id;
+	__nds32__mtsr_dsb(cid, NDS32_SR_TLB_MISC);
+	__nds32__mtsr_isb(__pa(mm->pgd), NDS32_SR_L1_PPTB);
+}
diff --git a/arch/nds32/mm/tlb.c b/arch/nds32/mm/tlb.c
new file mode 100644
index 0000000..dd41f5e
--- /dev/null
+++ b/arch/nds32/mm/tlb.c
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/spinlock_types.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <asm/nds32.h>
+#include <nds32_intrinsic.h>
+
+unsigned int cpu_last_cid = { TLB_MISC_mskCID + (2 << TLB_MISC_offCID) };
+
+DEFINE_SPINLOCK(cid_lock);
+
+void local_flush_tlb_range(struct vm_area_struct *vma,
+			   unsigned long start, unsigned long end)
+{
+	unsigned long flags, ocid, ncid;
+
+	if ((end - start) > 0x400000) {
+		__nds32__tlbop_flua();
+		__nds32__isb();
+		return;
+	}
+
+	spin_lock_irqsave(&cid_lock, flags);
+	ocid = __nds32__mfsr(NDS32_SR_TLB_MISC);
+	ncid = (ocid & ~TLB_MISC_mskCID) | vma->vm_mm->context.id;
+	__nds32__mtsr_dsb(ncid, NDS32_SR_TLB_MISC);
+	while (start < end) {
+		__nds32__tlbop_inv(start);
+		__nds32__isb();
+		start += PAGE_SIZE;
+	}
+	__nds32__mtsr_dsb(ocid, NDS32_SR_TLB_MISC);
+	spin_unlock_irqrestore(&cid_lock, flags);
+}
+
+void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
+{
+	unsigned long flags, ocid, ncid;
+
+	spin_lock_irqsave(&cid_lock, flags);
+	ocid = __nds32__mfsr(NDS32_SR_TLB_MISC);
+	ncid = (ocid & ~TLB_MISC_mskCID) | vma->vm_mm->context.id;
+	__nds32__mtsr_dsb(ncid, NDS32_SR_TLB_MISC);
+	__nds32__tlbop_inv(addr);
+	__nds32__isb();
+	__nds32__mtsr_dsb(ocid, NDS32_SR_TLB_MISC);
+	spin_unlock_irqrestore(&cid_lock, flags);
+}
diff --git a/arch/nios2/include/asm/io.h b/arch/nios2/include/asm/io.h
index ce072ba..9010243 100644
--- a/arch/nios2/include/asm/io.h
+++ b/arch/nios2/include/asm/io.h
@@ -45,6 +45,7 @@ static inline void iounmap(void __iomem *addr)
 	__iounmap(addr);
 }
 
+#define ioremap_nocache ioremap_nocache
 #define ioremap_wc ioremap_nocache
 #define ioremap_wt ioremap_nocache
 
diff --git a/arch/openrisc/include/asm/io.h b/arch/openrisc/include/asm/io.h
index 7c69139..6709b28 100644
--- a/arch/openrisc/include/asm/io.h
+++ b/arch/openrisc/include/asm/io.h
@@ -29,13 +29,14 @@
 #define PIO_OFFSET		0
 #define PIO_MASK		0
 
+#define ioremap_nocache ioremap_nocache
 #include <asm-generic/io.h>
 #include <asm/pgtable.h>
 
 extern void __iomem *__ioremap(phys_addr_t offset, unsigned long size,
 				pgprot_t prot);
 
-static inline void __iomem *ioremap(phys_addr_t offset, unsigned long size)
+static inline void __iomem *ioremap(phys_addr_t offset, size_t size)
 {
 	return __ioremap(offset, size, PAGE_KERNEL);
 }
diff --git a/arch/sparc/include/asm/io_32.h b/arch/sparc/include/asm/io_32.h
index cd51a89..df2dc17 100644
--- a/arch/sparc/include/asm/io_32.h
+++ b/arch/sparc/include/asm/io_32.h
@@ -127,12 +127,7 @@ static inline void sbus_memcpy_toio(volatile void __iomem *dst,
  * Bus number may be embedded in the higher bits of the physical address.
  * This is why we have no bus number argument to ioremap().
  */
-void __iomem *ioremap(unsigned long offset, unsigned long size);
-#define ioremap_nocache(X,Y)	ioremap((X),(Y))
-#define ioremap_wc(X,Y)		ioremap((X),(Y))
-#define ioremap_wt(X,Y)		ioremap((X),(Y))
 void iounmap(volatile void __iomem *addr);
-
 /* Create a virtual mapping cookie for an IO port range */
 void __iomem *ioport_map(unsigned long port, unsigned int nr);
 void ioport_unmap(void __iomem *);
diff --git a/arch/sparc/kernel/ioport.c b/arch/sparc/kernel/ioport.c
index 7eeef80..3bcef9c 100644
--- a/arch/sparc/kernel/ioport.c
+++ b/arch/sparc/kernel/ioport.c
@@ -122,12 +122,12 @@ static void xres_free(struct xresource *xrp) {
  *
  * Bus type is always zero on IIep.
  */
-void __iomem *ioremap(unsigned long offset, unsigned long size)
+void __iomem *ioremap(phys_addr_t offset, size_t size)
 {
 	char name[14];
 
 	sprintf(name, "phys_%08x", (u32)offset);
-	return _sparc_alloc_io(0, offset, size, name);
+	return _sparc_alloc_io(0, (unsigned long)offset, size, name);
 }
 EXPORT_SYMBOL(ioremap);
 
diff --git a/arch/xtensa/include/asm/io.h b/arch/xtensa/include/asm/io.h
index c38e5a7..acc5bb2 100644
--- a/arch/xtensa/include/asm/io.h
+++ b/arch/xtensa/include/asm/io.h
@@ -52,6 +52,7 @@ static inline void __iomem *ioremap_cache(unsigned long offset,
 		return xtensa_ioremap_cache(offset, size);
 }
 #define ioremap_cache ioremap_cache
+#define ioremap_nocache ioremap_nocache
 
 #define ioremap_wc ioremap_nocache
 #define ioremap_wt ioremap_nocache
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index d2e5382..14c9796 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -592,4 +592,13 @@ config CLKSRC_ST_LPC
 	  Enable this option to use the Low Power controller timer
 	  as clocksource.
 
+config ATCPIT100_TIMER
+	bool "ATCPIT100 timer driver"
+	depends on NDS32 || COMPILE_TEST
+	depends on HAS_IOMEM
+	select TIMER_OF
+	default NDS32
+	help
+	  This option enables support for the Andestech ATCPIT100 timers.
+
 endmenu
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index d6dec44..a79523b 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -76,3 +76,4 @@ obj-$(CONFIG_H8300_TMR16)		+= h8300_timer16.o
 obj-$(CONFIG_H8300_TPU)			+= h8300_tpu.o
 obj-$(CONFIG_CLKSRC_ST_LPC)		+= clksrc_st_lpc.o
 obj-$(CONFIG_X86_NUMACHIP)		+= numachip.o
+obj-$(CONFIG_ATCPIT100_TIMER)		+= timer-atcpit100.o
diff --git a/drivers/clocksource/timer-atcpit100.c b/drivers/clocksource/timer-atcpit100.c
new file mode 100644
index 0000000..5e23d7b
--- /dev/null
+++ b/drivers/clocksource/timer-atcpit100.c
@@ -0,0 +1,266 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+/*
+ *  Andestech ATCPIT100 Timer Device Driver Implementation
+ * Rick Chen, Andes Technology Corporation <rick@andestech.com>
+ *
+ */
+
+#include <linux/irq.h>
+#include <linux/clocksource.h>
+#include <linux/clockchips.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/cpufreq.h>
+#include <linux/sched.h>
+#include <linux/sched_clock.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include "timer-of.h"
+#ifdef CONFIG_NDS32
+#include <asm/vdso_timer_info.h>
+#endif
+
+/*
+ * Definition of register offsets
+ */
+
+/* ID and Revision Register */
+#define ID_REV		0x0
+
+/* Configuration Register */
+#define CFG		0x10
+
+/* Interrupt Enable Register */
+#define INT_EN		0x14
+#define CH_INT_EN(c, i)	((1<<i)<<(4*c))
+#define CH0INT0EN	0x01
+
+/* Interrupt Status Register */
+#define INT_STA		0x18
+#define CH0INT0		0x01
+
+/* Channel Enable Register */
+#define CH_EN		0x1C
+#define CH0TMR0EN	0x1
+#define CH1TMR0EN	0x10
+
+/* Channel 0 , 1 Control Register */
+#define CH0_CTL		(0x20)
+#define CH1_CTL		(0x20 + 0x10)
+
+/* Channel clock source , bit 3 , 0:External clock , 1:APB clock */
+#define APB_CLK		BIT(3)
+
+/* Channel mode , bit 0~2 */
+#define TMR_32		0x1
+#define TMR_16		0x2
+#define TMR_8		0x3
+
+/* Channel 0 , 1 Reload Register */
+#define CH0_REL		(0x24)
+#define CH1_REL		(0x24 + 0x10)
+
+/* Channel 0 , 1 Counter Register */
+#define CH0_CNT		(0x28)
+#define CH1_CNT		(0x28 + 0x10)
+
+#define TIMER_SYNC_TICKS	3
+
+static void atcpit100_ch1_tmr0_en(void __iomem *base)
+{
+	writel(~0, base + CH1_REL);
+	writel(APB_CLK|TMR_32, base + CH1_CTL);
+}
+
+static void atcpit100_ch0_tmr0_en(void __iomem *base)
+{
+	writel(APB_CLK|TMR_32, base + CH0_CTL);
+}
+
+static void atcpit100_clkevt_time_setup(void __iomem *base, unsigned long delay)
+{
+	writel(delay, base + CH0_CNT);
+	writel(delay, base + CH0_REL);
+}
+
+static void atcpit100_timer_clear_interrupt(void __iomem *base)
+{
+	u32 val;
+
+	val = readl(base + INT_STA);
+	writel(val | CH0INT0, base + INT_STA);
+}
+
+static void atcpit100_clocksource_start(void __iomem *base)
+{
+	u32 val;
+
+	val = readl(base + CH_EN);
+	writel(val | CH1TMR0EN, base + CH_EN);
+}
+
+static void atcpit100_clkevt_time_start(void __iomem *base)
+{
+	u32 val;
+
+	val = readl(base + CH_EN);
+	writel(val | CH0TMR0EN, base + CH_EN);
+}
+
+static void atcpit100_clkevt_time_stop(void __iomem *base)
+{
+	u32 val;
+
+	atcpit100_timer_clear_interrupt(base);
+	val = readl(base + CH_EN);
+	writel(val & ~CH0TMR0EN, base + CH_EN);
+}
+
+static int atcpit100_clkevt_next_event(unsigned long evt,
+	struct clock_event_device *clkevt)
+{
+	u32 val;
+	struct timer_of *to = to_timer_of(clkevt);
+
+	val = readl(timer_of_base(to) + CH_EN);
+	writel(val & ~CH0TMR0EN, timer_of_base(to) + CH_EN);
+	writel(evt, timer_of_base(to) + CH0_REL);
+	writel(val | CH0TMR0EN, timer_of_base(to) + CH_EN);
+
+	return 0;
+}
+
+static int atcpit100_clkevt_set_periodic(struct clock_event_device *evt)
+{
+	struct timer_of *to = to_timer_of(evt);
+
+	atcpit100_clkevt_time_setup(timer_of_base(to), timer_of_period(to));
+	atcpit100_clkevt_time_start(timer_of_base(to));
+
+	return 0;
+}
+static int atcpit100_clkevt_shutdown(struct clock_event_device *evt)
+{
+	struct timer_of *to = to_timer_of(evt);
+
+	atcpit100_clkevt_time_stop(timer_of_base(to));
+
+	return 0;
+}
+static int atcpit100_clkevt_set_oneshot(struct clock_event_device *evt)
+{
+	struct timer_of *to = to_timer_of(evt);
+	u32 val;
+
+	writel(~0x0, timer_of_base(to) + CH0_REL);
+	val = readl(timer_of_base(to) + CH_EN);
+	writel(val | CH0TMR0EN, timer_of_base(to) + CH_EN);
+
+	return 0;
+}
+
+static irqreturn_t atcpit100_timer_interrupt(int irq, void *dev_id)
+{
+	struct clock_event_device *evt = (struct clock_event_device *)dev_id;
+	struct timer_of *to = to_timer_of(evt);
+
+	atcpit100_timer_clear_interrupt(timer_of_base(to));
+
+	evt->event_handler(evt);
+
+	return IRQ_HANDLED;
+}
+
+static struct timer_of to = {
+	.flags = TIMER_OF_IRQ | TIMER_OF_CLOCK | TIMER_OF_BASE,
+
+	.clkevt = {
+		.name = "atcpit100_tick",
+		.rating = 300,
+		.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+		.set_state_shutdown = atcpit100_clkevt_shutdown,
+		.set_state_periodic = atcpit100_clkevt_set_periodic,
+		.set_state_oneshot = atcpit100_clkevt_set_oneshot,
+		.tick_resume = atcpit100_clkevt_shutdown,
+		.set_next_event = atcpit100_clkevt_next_event,
+		.cpumask = cpu_all_mask,
+	},
+
+	.of_irq = {
+		.handler = atcpit100_timer_interrupt,
+		.flags = IRQF_TIMER | IRQF_IRQPOLL,
+	},
+
+	/*
+	 * FIXME: we currently only support clocking using PCLK
+	 * and using EXTCLK is not supported in the driver.
+	 */
+	.of_clk = {
+		.name = "PCLK",
+	}
+};
+
+static u64 notrace atcpit100_timer_sched_read(void)
+{
+	return ~readl(timer_of_base(&to) + CH1_CNT);
+}
+
+#ifdef CONFIG_NDS32
+static void fill_vdso_need_info(struct device_node *node)
+{
+	struct resource timer_res;
+	of_address_to_resource(node, 0, &timer_res);
+	timer_info.mapping_base = (unsigned long)timer_res.start;
+	timer_info.cycle_count_down = true;
+	timer_info.cycle_count_reg_offset = CH1_CNT;
+}
+#endif
+
+static int __init atcpit100_timer_init(struct device_node *node)
+{
+	int ret;
+	u32 val;
+	void __iomem *base;
+
+	ret = timer_of_init(node, &to);
+	if (ret)
+		return ret;
+
+	base = timer_of_base(&to);
+
+	sched_clock_register(atcpit100_timer_sched_read, 32,
+		timer_of_rate(&to));
+
+	ret = clocksource_mmio_init(base + CH1_CNT,
+		node->name, timer_of_rate(&to), 300, 32,
+		clocksource_mmio_readl_down);
+
+	if (ret) {
+		pr_err("Failed to register clocksource\n");
+		return ret;
+	}
+
+	/* clear channel 0 timer0 interrupt */
+	atcpit100_timer_clear_interrupt(base);
+
+	clockevents_config_and_register(&to.clkevt, timer_of_rate(&to),
+					TIMER_SYNC_TICKS, 0xffffffff);
+	atcpit100_ch0_tmr0_en(base);
+	atcpit100_ch1_tmr0_en(base);
+	atcpit100_clocksource_start(base);
+	atcpit100_clkevt_time_start(base);
+
+	/* Enable channel 0 timer0 interrupt */
+	val = readl(base + INT_EN);
+	writel(val | CH0INT0EN, base + INT_EN);
+
+#ifdef CONFIG_NDS32
+	fill_vdso_need_info(node);
+#endif
+
+	return ret;
+}
+
+TIMER_OF_DECLARE(atcpit100, "andestech,atcpit100", atcpit100_timer_init);
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index d27e3e3..de7cf48 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -85,3 +85,4 @@ obj-$(CONFIG_IRQ_UNIPHIER_AIDET)	+= irq-uniphier-aidet.o
 obj-$(CONFIG_ARCH_SYNQUACER)		+= irq-sni-exiu.o
 obj-$(CONFIG_MESON_IRQ_GPIO)		+= irq-meson-gpio.o
 obj-$(CONFIG_GOLDFISH_PIC) 		+= irq-goldfish-pic.o
+obj-$(CONFIG_NDS32)			+= irq-ativic32.o
diff --git a/drivers/irqchip/irq-ativic32.c b/drivers/irqchip/irq-ativic32.c
new file mode 100644
index 0000000..f69a858
--- /dev/null
+++ b/drivers/irqchip/irq-ativic32.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/irq.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+#include <linux/interrupt.h>
+#include <linux/irqdomain.h>
+#include <linux/irqchip.h>
+#include <nds32_intrinsic.h>
+
+static void ativic32_ack_irq(struct irq_data *data)
+{
+	__nds32__mtsr_dsb(BIT(data->hwirq), NDS32_SR_INT_PEND2);
+}
+
+static void ativic32_mask_irq(struct irq_data *data)
+{
+	unsigned long int_mask2 = __nds32__mfsr(NDS32_SR_INT_MASK2);
+	__nds32__mtsr_dsb(int_mask2 & (~(BIT(data->hwirq))), NDS32_SR_INT_MASK2);
+}
+
+static void ativic32_unmask_irq(struct irq_data *data)
+{
+	unsigned long int_mask2 = __nds32__mfsr(NDS32_SR_INT_MASK2);
+	__nds32__mtsr_dsb(int_mask2 | (BIT(data->hwirq)), NDS32_SR_INT_MASK2);
+}
+
+static struct irq_chip ativic32_chip = {
+	.name = "ativic32",
+	.irq_ack = ativic32_ack_irq,
+	.irq_mask = ativic32_mask_irq,
+	.irq_unmask = ativic32_unmask_irq,
+};
+
+static unsigned int __initdata nivic_map[6] = { 6, 2, 10, 16, 24, 32 };
+
+static struct irq_domain *root_domain;
+static int ativic32_irq_domain_map(struct irq_domain *id, unsigned int virq,
+				  irq_hw_number_t hw)
+{
+
+	unsigned long int_trigger_type;
+	u32 type;
+	struct irq_data *irq_data;
+	int_trigger_type = __nds32__mfsr(NDS32_SR_INT_TRIGGER);
+	irq_data = irq_get_irq_data(virq);
+	if (!irq_data)
+		return -EINVAL;
+
+	if (int_trigger_type & (BIT(hw))) {
+		irq_set_chip_and_handler(virq, &ativic32_chip, handle_edge_irq);
+		type = IRQ_TYPE_EDGE_RISING;
+	} else {
+		irq_set_chip_and_handler(virq, &ativic32_chip, handle_level_irq);
+		type = IRQ_TYPE_LEVEL_HIGH;
+	}
+
+	irqd_set_trigger_type(irq_data, type);
+	return 0;
+}
+
+static struct irq_domain_ops ativic32_ops = {
+	.map = ativic32_irq_domain_map,
+	.xlate = irq_domain_xlate_onecell
+};
+
+static irq_hw_number_t get_intr_src(void)
+{
+	return ((__nds32__mfsr(NDS32_SR_ITYPE) & ITYPE_mskVECTOR) >> ITYPE_offVECTOR)
+		- NDS32_VECTOR_offINTERRUPT;
+}
+
+asmlinkage void asm_do_IRQ(struct pt_regs *regs)
+{
+	irq_hw_number_t hwirq = get_intr_src();
+	handle_domain_irq(root_domain, hwirq, regs);
+}
+
+int __init ativic32_init_irq(struct device_node *node, struct device_node *parent)
+{
+	unsigned long int_vec_base, nivic, nr_ints;
+
+	if (WARN(parent, "non-root ativic32 are not supported"))
+		return -EINVAL;
+
+	int_vec_base = __nds32__mfsr(NDS32_SR_IVB);
+
+	if (((int_vec_base & IVB_mskIVIC_VER) >> IVB_offIVIC_VER) == 0)
+		panic("Unable to use atcivic32 for this cpu.\n");
+
+	nivic = (int_vec_base & IVB_mskNIVIC) >> IVB_offNIVIC;
+	if (nivic >= ARRAY_SIZE(nivic_map))
+		panic("The number of input for ativic32 is not supported.\n");
+
+	nr_ints = nivic_map[nivic];
+
+	root_domain = irq_domain_add_linear(node, nr_ints,
+			&ativic32_ops, NULL);
+
+	if (!root_domain)
+		panic("%s: unable to create IRQ domain\n", node->full_name);
+
+	return 0;
+}
+IRQCHIP_DECLARE(ativic32, "andestech,ativic32", ativic32_init_irq);
diff --git a/drivers/net/ethernet/faraday/Kconfig b/drivers/net/ethernet/faraday/Kconfig
index 040c7f1..0fb8df6 100644
--- a/drivers/net/ethernet/faraday/Kconfig
+++ b/drivers/net/ethernet/faraday/Kconfig
@@ -5,7 +5,7 @@
 config NET_VENDOR_FARADAY
 	bool "Faraday devices"
 	default y
-	depends on ARM
+	depends on ARM || NDS32 || COMPILE_TEST
 	---help---
 	  If you have a network (Ethernet) card belonging to this class, say Y.
 
@@ -18,7 +18,8 @@ if NET_VENDOR_FARADAY
 
 config FTMAC100
 	tristate "Faraday FTMAC100 10/100 Ethernet support"
-	depends on ARM
+	depends on ARM || NDS32 || COMPILE_TEST
+	depends on !64BIT || BROKEN
 	select MII
 	---help---
 	  This driver supports the FTMAC100 10/100 Ethernet controller
@@ -27,7 +28,8 @@ config FTMAC100
 
 config FTGMAC100
 	tristate "Faraday FTGMAC100 Gigabit Ethernet support"
-	depends on ARM
+	depends on ARM || NDS32 || COMPILE_TEST
+	depends on !64BIT || BROKEN
 	select PHYLIB
 	---help---
 	  This driver supports the FTGMAC100 Gigabit Ethernet controller
diff --git a/drivers/video/console/Kconfig b/drivers/video/console/Kconfig
index 7f1f1fb..27bb893 100644
--- a/drivers/video/console/Kconfig
+++ b/drivers/video/console/Kconfig
@@ -9,7 +9,7 @@ config VGA_CONSOLE
 	depends on !4xx && !PPC_8xx && !SPARC && !M68K && !PARISC && !FRV && \
 		!SUPERH && !BLACKFIN && !AVR32 && !MN10300 && !CRIS && \
 		(!ARM || ARCH_FOOTBRIDGE || ARCH_INTEGRATOR || ARCH_NETWINDER) && \
-		!ARM64 && !ARC && !MICROBLAZE && !OPENRISC
+		!ARM64 && !ARC && !MICROBLAZE && !OPENRISC && !NDS32
 	default y
 	help
 	  Saying Y here will allow you to use Linux in text mode through a
diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index b4531e3..7c6a39e 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -852,7 +852,16 @@ static inline void __iomem *__ioremap(phys_addr_t offset, size_t size,
 }
 #endif
 
+#ifndef iounmap
+#define iounmap iounmap
+
+static inline void iounmap(void __iomem *addr)
+{
+}
+#endif
+#endif /* CONFIG_MMU */
 #ifndef ioremap_nocache
+void __iomem *ioremap(phys_addr_t phys_addr, size_t size);
 #define ioremap_nocache ioremap_nocache
 static inline void __iomem *ioremap_nocache(phys_addr_t offset, size_t size)
 {
@@ -884,15 +893,6 @@ static inline void __iomem *ioremap_wt(phys_addr_t offset, size_t size)
 }
 #endif
 
-#ifndef iounmap
-#define iounmap iounmap
-
-static inline void iounmap(void __iomem *addr)
-{
-}
-#endif
-#endif /* CONFIG_MMU */
-
 #ifdef CONFIG_HAS_IOPORT_MAP
 #ifndef CONFIG_GENERIC_IOMAP
 #ifndef ioport_map