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menu "Memory management options"
config QUICKLIST
def_bool y
config MMU
bool "Support for memory management hardware"
depends on !CPU_SH2
default y
help
Some SH processors (such as SH-2/SH-2A) lack an MMU. In order to
boot on these systems, this option must not be set.
On other systems (such as the SH-3 and 4) where an MMU exists,
turning this off will boot the kernel on these machines with the
MMU implicitly switched off.
config PAGE_OFFSET
hex
default "0x80000000" if MMU
default "0x00000000"
config MEMORY_START
hex "Physical memory start address"
default "0x08000000"
---help---
Computers built with Hitachi SuperH processors always
map the ROM starting at address zero. But the processor
does not specify the range that RAM takes.
The physical memory (RAM) start address will be automatically
set to 08000000. Other platforms, such as the Solution Engine
boards typically map RAM at 0C000000.
Tweak this only when porting to a new machine which does not
already have a defconfig. Changing it from the known correct
value on any of the known systems will only lead to disaster.
config MEMORY_SIZE
hex "Physical memory size"
default "0x00400000"
help
This sets the default memory size assumed by your SH kernel. It can
be overridden as normal by the 'mem=' argument on the kernel command
line. If unsure, consult your board specifications or just leave it
as 0x00400000 which was the default value before this became
configurable.
config 32BIT
bool "Support 32-bit physical addressing through PMB"
depends on MMU && (CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785)
default y
help
If you say Y here, physical addressing will be extended to
32-bits through the SH-4A PMB. If this is not set, legacy
29-bit physical addressing will be used.
config X2TLB
bool "Enable extended TLB mode"
depends on (CPU_SHX2 || CPU_SHX3) && MMU && EXPERIMENTAL
help
Selecting this option will enable the extended mode of the SH-X2
TLB. For legacy SH-X behaviour and interoperability, say N. For
all of the fun new features and a willingless to submit bug reports,
say Y.
config VSYSCALL
bool "Support vsyscall page"
depends on MMU
default y
help
This will enable support for the kernel mapping a vDSO page
in process space, and subsequently handing down the entry point
to the libc through the ELF auxiliary vector.
From the kernel side this is used for the signal trampoline.
For systems with an MMU that can afford to give up a page,
(the default value) say Y.
config NUMA
bool "Non Uniform Memory Access (NUMA) Support"
depends on MMU && SYS_SUPPORTS_NUMA && EXPERIMENTAL
default n
help
Some SH systems have many various memories scattered around
the address space, each with varying latencies. This enables
support for these blocks by binding them to nodes and allowing
memory policies to be used for prioritizing and controlling
allocation behaviour.
config NODES_SHIFT
int
default "3" if CPU_SUBTYPE_SHX3
default "1"
depends on NEED_MULTIPLE_NODES
config ARCH_FLATMEM_ENABLE
def_bool y
depends on !NUMA
config ARCH_SPARSEMEM_ENABLE
def_bool y
select SPARSEMEM_STATIC
config ARCH_SPARSEMEM_DEFAULT
def_bool y
config MAX_ACTIVE_REGIONS
int
default "6" if (CPU_SUBTYPE_SHX3 && SPARSEMEM)
default "2" if SPARSEMEM && (CPU_SUBTYPE_SH7722 || \
CPU_SUBTYPE_SH7785)
default "1"
config ARCH_POPULATES_NODE_MAP
def_bool y
config ARCH_SELECT_MEMORY_MODEL
def_bool y
config ARCH_ENABLE_MEMORY_HOTPLUG
def_bool y
depends on SPARSEMEM
config ARCH_MEMORY_PROBE
def_bool y
depends on MEMORY_HOTPLUG
choice
prompt "Kernel page size"
default PAGE_SIZE_8KB if X2TLB
default PAGE_SIZE_4KB
config PAGE_SIZE_4KB
bool "4kB"
depends on !X2TLB
help
This is the default page size used by all SuperH CPUs.
config PAGE_SIZE_8KB
bool "8kB"
depends on X2TLB
help
This enables 8kB pages as supported by SH-X2 and later MMUs.
config PAGE_SIZE_64KB
bool "64kB"
depends on CPU_SH4
help
This enables support for 64kB pages, possible on all SH-4
CPUs and later.
endchoice
choice
prompt "HugeTLB page size"
depends on HUGETLB_PAGE && CPU_SH4 && MMU
default HUGETLB_PAGE_SIZE_64K
config HUGETLB_PAGE_SIZE_64K
bool "64kB"
config HUGETLB_PAGE_SIZE_256K
bool "256kB"
depends on X2TLB
config HUGETLB_PAGE_SIZE_1MB
bool "1MB"
config HUGETLB_PAGE_SIZE_4MB
bool "4MB"
depends on X2TLB
config HUGETLB_PAGE_SIZE_64MB
bool "64MB"
depends on X2TLB
endchoice
source "mm/Kconfig"
endmenu
menu "Cache configuration"
config SH7705_CACHE_32KB
bool "Enable 32KB cache size for SH7705"
depends on CPU_SUBTYPE_SH7705
default y
config SH_DIRECT_MAPPED
bool "Use direct-mapped caching"
default n
help
Selecting this option will configure the caches to be direct-mapped,
even if the cache supports a 2 or 4-way mode. This is useful primarily
for debugging on platforms with 2 and 4-way caches (SH7750R/SH7751R,
SH4-202, SH4-501, etc.)
Turn this option off for platforms that do not have a direct-mapped
cache, and you have no need to run the caches in such a configuration.
choice
prompt "Cache mode"
default CACHE_WRITEBACK if CPU_SH2A || CPU_SH3 || CPU_SH4
default CACHE_WRITETHROUGH if (CPU_SH2 && !CPU_SH2A)
config CACHE_WRITEBACK
bool "Write-back"
depends on CPU_SH2A || CPU_SH3 || CPU_SH4
config CACHE_WRITETHROUGH
bool "Write-through"
help
Selecting this option will configure the caches in write-through
mode, as opposed to the default write-back configuration.
Since there's sill some aliasing issues on SH-4, this option will
unfortunately still require the majority of flushing functions to
be implemented to deal with aliasing.
If unsure, say N.
config CACHE_OFF
bool "Off"
endchoice
endmenu
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