Add basic support for FDT to i386 & amd64. This change includes:

1.  Common headers for fdt.h and ofw_machdep.h under x86/include
    with indirections under i386/include and amd64/include.
2.  New modinfo for loader provided FDT blob.
3.  Common x86_init_fdt() called from hammer_time() on amd64 and
    init386() on i386.
4.  Split-off FDT specific low-level console functions from FDT
    bus methods for the uart(4) driver. The low-level console
    logic has been moved to uart_cpu_fdt.c and is used for arm,
    mips & powerpc only. The FDT bus methods are shared across
    all architectures.
5.  Add dev/fdt/fdt_x86.c to hold the fdt_fixup_table[] and the
    fdt_pic_table[] arrays. Both are empty right now.

FDT addresses are I/O ports on x86. Since the core FDT code does
not handle different address spaces, adding support for both I/O
ports and memory addresses requires some thought and discussion.
It may be better to use a compile-time option that controls this.

Obtained from:	Juniper Networks, Inc.

22 files changed, 448 insertions, 101 deletions

diff --git a/sys/amd64/amd64/machdep.c b/sys/amd64/amd64/machdep.c
index a543421..bc336e9 100644
--- a/sys/amd64/amd64/machdep.c
+++ b/sys/amd64/amd64/machdep.c
@@ -53,6 +53,7 @@ __FBSDID("$FreeBSD$");
 #include "opt_maxmem.h"
 #include "opt_mp_watchdog.h"
 #include "opt_perfmon.h"
+#include "opt_platform.h"
 #include "opt_sched.h"
 #include "opt_kdtrace.h"
 
@@ -133,6 +134,9 @@ __FBSDID("$FreeBSD$");
 #ifdef SMP
 #include <machine/smp.h>
 #endif
+#ifdef FDT
+#include <x86/fdt.h>
+#endif
 
 #ifdef DEV_ATPIC
 #include <x86/isa/icu.h>
@@ -1886,6 +1890,10 @@ hammer_time(u_int64_t modulep, u_int64_t physfree)
 
 	cpu_probe_amdc1e();
 
+#ifdef FDT
+	x86_init_fdt();
+#endif
+
 	/* Location of kernel stack for locore */
 	return ((u_int64_t)thread0.td_pcb);
 }
diff --git a/sys/amd64/include/fdt.h b/sys/amd64/include/fdt.h
new file mode 100644
index 0000000..1a03514
--- /dev/null
+++ b/sys/amd64/include/fdt.h
@@ -0,0 +1,6 @@
+/*-
+ * This file is in the public domain.
+ */
+/* $FreeBSD$ */
+
+#include <x86/fdt.h>
diff --git a/sys/amd64/include/metadata.h b/sys/amd64/include/metadata.h
index 4c7ec9e..73c9207 100644
--- a/sys/amd64/include/metadata.h
+++ b/sys/amd64/include/metadata.h
@@ -31,5 +31,6 @@
 
 #define	MODINFOMD_SMAP		0x1001
 #define	MODINFOMD_SMAP_XATTR	0x1002
+#define	MODINFOMD_DTBP		0x1003
 
 #endif /* !_MACHINE_METADATA_H_ */
diff --git a/sys/amd64/include/ofw_machdep.h b/sys/amd64/include/ofw_machdep.h
new file mode 100644
index 0000000..4457f85
--- /dev/null
+++ b/sys/amd64/include/ofw_machdep.h
@@ -0,0 +1,6 @@
+/*-
+ * This file is in the public domain.
+ */
+/* $FreeBSD$ */
+
+#include <x86/ofw_machdep.h>
diff --git a/sys/conf/Makefile.amd64 b/sys/conf/Makefile.amd64
index 0dce5ef..716c742 100644
--- a/sys/conf/Makefile.amd64
+++ b/sys/conf/Makefile.amd64
@@ -31,6 +31,8 @@ S=	../../..
 .endif
 .include "$S/conf/kern.pre.mk"
 
+INCLUDES+= -I$S/contrib/libfdt
+
 .if !empty(DDB_ENABLED) || !empty(DTR_ENABLED) || !empty(HWPMC_ENABLED)
 CFLAGS+=	-fno-omit-frame-pointer
 .endif
diff --git a/sys/conf/Makefile.i386 b/sys/conf/Makefile.i386
index 538ccbc..4651e8d 100644
--- a/sys/conf/Makefile.i386
+++ b/sys/conf/Makefile.i386
@@ -30,6 +30,8 @@ S=	../../..
 .endif
 .include "$S/conf/kern.pre.mk"
 
+INCLUDES+= -I$S/contrib/libfdt
+
 MACHINE=i386
 
 MKMODULESENV+=	MACHINE=${MACHINE}
diff --git a/sys/conf/files b/sys/conf/files
index 2208937..7e52504 100644
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -2903,6 +2903,7 @@ libkern/inet_pton.c		standard
 libkern/jenkins_hash.c		standard
 libkern/mcount.c		optional profiling-routine
 libkern/memcchr.c		standard
+libkern/memchr.c		optional fdt
 libkern/memcmp.c		standard
 libkern/qsort.c			standard
 libkern/qsort_r.c		standard
diff --git a/sys/conf/files.amd64 b/sys/conf/files.amd64
index fc5a04f..cdb43df 100644
--- a/sys/conf/files.amd64
+++ b/sys/conf/files.amd64
@@ -189,6 +189,7 @@ dev/fdc/fdc.c			optional	fdc
 dev/fdc/fdc_acpi.c		optional	fdc
 dev/fdc/fdc_isa.c		optional	fdc isa
 dev/fdc/fdc_pccard.c		optional	fdc pccard
+dev/fdt/fdt_x86.c		optional	fdt
 dev/hpt27xx/os_bsd.c		optional	hpt27xx
 dev/hpt27xx/osm_bsd.c		optional	hpt27xx
 dev/hpt27xx/hpt27xx_config.c	optional	hpt27xx
@@ -501,6 +502,7 @@ x86/pci/pci_bus.c		optional	pci
 x86/pci/qpi.c			optional	pci
 x86/x86/busdma_machdep.c	standard
 x86/x86/dump_machdep.c		standard
+x86/x86/fdt_machdep.c		optional	fdt
 x86/x86/intr_machdep.c		standard
 x86/x86/io_apic.c		standard
 x86/x86/legacy.c		standard
diff --git a/sys/conf/files.arm b/sys/conf/files.arm
index f9e0be8..ade34e6 100644
--- a/sys/conf/files.arm
+++ b/sys/conf/files.arm
@@ -66,6 +66,8 @@ dev/kbd/kbd.c			optional	sc
 dev/syscons/scgfbrndr.c		optional	sc
 dev/syscons/scterm-teken.c	optional	sc
 dev/syscons/scvtb.c		optional	sc
+dev/uart/uart_cpu_fdt.c		optional	uart fdt
+
 font.h				optional	sc			\
 	compile-with	"uudecode < /usr/share/syscons/fonts/${SC_DFLT_FONT}-8x16.fnt && file2c 'u_char dflt_font_16[16*256] = {' '};' < ${SC_DFLT_FONT}-8x16 > font.h && uudecode < /usr/share/syscons/fonts/${SC_DFLT_FONT}-8x14.fnt && file2c 'u_char dflt_font_14[14*256] = {' '};' < ${SC_DFLT_FONT}-8x14 >> font.h && uudecode < /usr/share/syscons/fonts/${SC_DFLT_FONT}-8x8.fnt && file2c 'u_char dflt_font_8[8*256] = {' '};' < ${SC_DFLT_FONT}-8x8 >> font.h" \
 	no-obj no-implicit-rule before-depend				\
@@ -87,7 +89,6 @@ libkern/ffsl.c			standard
 libkern/fls.c			standard
 libkern/flsl.c			standard
 libkern/lshrdi3.c		standard
-libkern/memchr.c		optional	fdt
 libkern/moddi3.c		standard
 libkern/qdivrem.c		standard
 libkern/ucmpdi2.c		standard
diff --git a/sys/conf/files.i386 b/sys/conf/files.i386
index 79a91cd..218472b 100644
--- a/sys/conf/files.i386
+++ b/sys/conf/files.i386
@@ -176,6 +176,7 @@ dev/fdc/fdc.c			optional fdc
 dev/fdc/fdc_acpi.c		optional fdc
 dev/fdc/fdc_isa.c		optional fdc isa
 dev/fdc/fdc_pccard.c		optional fdc pccard
+dev/fdt/fdt_x86.c		optional fdt
 dev/fe/if_fe_isa.c		optional fe isa
 dev/glxiic/glxiic.c		optional glxiic
 dev/glxsb/glxsb.c		optional glxsb
@@ -545,6 +546,7 @@ x86/pci/pci_bus.c		optional pci
 x86/pci/qpi.c			optional pci
 x86/x86/busdma_machdep.c	standard
 x86/x86/dump_machdep.c		standard
+x86/x86/fdt_machdep.c		optional fdt
 x86/x86/intr_machdep.c		standard
 x86/x86/io_apic.c		optional apic
 x86/x86/legacy.c		optional native
diff --git a/sys/conf/files.mips b/sys/conf/files.mips
index 2dfc5dd..7308143 100644
--- a/sys/conf/files.mips
+++ b/sys/conf/files.mips
@@ -53,7 +53,6 @@ kern/subr_dummy_vdso_tc.c		standard
 libkern/ffsl.c				standard
 libkern/fls.c				standard
 libkern/flsl.c				standard
-libkern/memchr.c			optional	fdt
 libkern/memmove.c			standard
 libkern/ucmpdi2.c			optional	mips | mipsel
 
@@ -72,6 +71,7 @@ mips/mips/sc_machdep.c			optional	sc
 
 # FDT support
 dev/fdt/fdt_mips.c			optional	fdt
+dev/uart/uart_cpu_fdt.c			optional	uart fdt
 
 # crypto support -- use generic
 crypto/blowfish/bf_enc.c		optional	crypto | ipsec 
diff --git a/sys/conf/files.powerpc b/sys/conf/files.powerpc
index 6ab02a8..96331f7 100644
--- a/sys/conf/files.powerpc
+++ b/sys/conf/files.powerpc
@@ -61,6 +61,7 @@ dev/syscons/scterm-teken.c	optional	sc
 dev/syscons/scvtb.c		optional	sc
 dev/tsec/if_tsec.c		optional	tsec
 dev/tsec/if_tsec_fdt.c		optional	tsec fdt
+dev/uart/uart_cpu_fdt.c		optional	uart fdt
 dev/uart/uart_cpu_powerpc.c	optional	uart aim
 dev/usb/controller/ehci_fsl.c	optional	ehci mpc85xx
 kern/kern_clocksource.c		standard
@@ -76,7 +77,6 @@ libkern/ffsl.c			standard
 libkern/fls.c			standard
 libkern/flsl.c			standard
 libkern/lshrdi3.c		optional	powerpc
-libkern/memchr.c		optional	fdt
 libkern/memmove.c		standard
 libkern/memset.c		standard
 libkern/moddi3.c		optional	powerpc
diff --git a/sys/dev/fdt/fdt_x86.c b/sys/dev/fdt/fdt_x86.c
new file mode 100644
index 0000000..3085f3b
--- /dev/null
+++ b/sys/dev/fdt/fdt_x86.c
@@ -0,0 +1,51 @@
+/*-
+ * Copyright (c) 2013 Juniper Networks, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/bus.h>
+
+#include <machine/intr_machdep.h>
+
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+#include <dev/ofw/openfirm.h>
+
+#include "ofw_bus_if.h"
+#include "fdt_common.h"
+
+struct fdt_fixup_entry fdt_fixup_table[] = {
+	{ NULL, NULL }
+};
+
+fdt_pic_decode_t fdt_pic_table[] = {
+	NULL
+};
diff --git a/sys/dev/uart/uart_bus_fdt.c b/sys/dev/uart/uart_bus_fdt.c
index f45a1c6..d7b6017 100644
--- a/sys/dev/uart/uart_bus_fdt.c
+++ b/sys/dev/uart/uart_bus_fdt.c
@@ -124,101 +124,3 @@ uart_fdt_probe(device_t dev)
 }
 
 DRIVER_MODULE(uart, simplebus, uart_fdt_driver, uart_devclass, 0, 0);
-
-/*
- * UART console routines.
- */
-bus_space_tag_t uart_bus_space_io;
-bus_space_tag_t uart_bus_space_mem;
-
-int
-uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
-{
-
-	return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
-}
-
-int
-uart_cpu_getdev(int devtype, struct uart_devinfo *di)
-{
-	char buf[64];
-	struct uart_class *class;
-	phandle_t node, chosen;
-	pcell_t shift, br, rclk;
-	u_long start, size, pbase, psize;
-	int err;
-
-	uart_bus_space_mem = fdtbus_bs_tag;
-	uart_bus_space_io = NULL;
-
-	/* Allow overriding the FDT uning the environment. */
-	class = &uart_ns8250_class;
-	err = uart_getenv(devtype, di, class);
-	if (!err)
-		return (0);
-
-	if (devtype != UART_DEV_CONSOLE)
-		return (ENXIO);
-
-	/*
-	 * Retrieve /chosen/std{in,out}.
-	 */
-	if ((chosen = OF_finddevice("/chosen")) == -1)
-		return (ENXIO);
-	if (OF_getprop(chosen, "stdin", buf, sizeof(buf)) <= 0)
-		return (ENXIO);
-	if ((node = OF_finddevice(buf)) == -1)
-		return (ENXIO);
-	if (OF_getprop(chosen, "stdout", buf, sizeof(buf)) <= 0)
-		return (ENXIO);
-	if (OF_finddevice(buf) != node)
-		/* Only stdin == stdout is supported. */
-		return (ENXIO);
-	/*
-	 * Retrieve serial attributes.
-	 */
-	uart_fdt_get_shift(node, &shift);
-
-	if (OF_getprop(node, "current-speed", &br, sizeof(br)) <= 0)
-		br = 0;
-	br = fdt32_to_cpu(br);
-
-	if ((err = uart_fdt_get_clock(node, &rclk)) != 0)
-		return (err);
-	/*
-	 * Finalize configuration.
-	 */
-	if (fdt_is_compatible(node, "fsl,imx-uart"))
-		class = &uart_imx_class;
-	if (fdt_is_compatible(node, "quicc"))
-		class = &uart_quicc_class;
-	if (fdt_is_compatible(node, "lpc"))
-		class = &uart_lpc_class;
-	if (fdt_is_compatible(node, "ns16550"))
-		class = &uart_ns8250_class;
-	if (fdt_is_compatible(node, "arm,pl011"))
-		class = &uart_pl011_class;
-	if (fdt_is_compatible(node, "cadence,uart"))
-		class = &uart_cdnc_class;
-
-	di->bas.chan = 0;
-	di->bas.regshft = (u_int)shift;
-	di->baudrate = br;
-	di->bas.rclk = (u_int)rclk;
-	di->ops = uart_getops(class);
-	di->databits = 8;
-	di->stopbits = 1;
-	di->parity = UART_PARITY_NONE;
-	di->bas.bst = uart_bus_space_mem;
-
-	err = fdt_regsize(node, &start, &size);
-	if (err)
-		return (ENXIO);
-	err = fdt_get_range(OF_parent(node), 0, &pbase, &psize);
-	if (err)
-		pbase = 0;
-
-	start += pbase;
-
-	return (bus_space_map(di->bas.bst, start, size, 0, &di->bas.bsh));
-}
diff --git a/sys/dev/uart/uart_cpu_fdt.c b/sys/dev/uart/uart_cpu_fdt.c
new file mode 100644
index 0000000..52d5f00
--- /dev/null
+++ b/sys/dev/uart/uart_cpu_fdt.c
@@ -0,0 +1,175 @@
+/*-
+ * Copyright (c) 2009-2010 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * This software was developed by Semihalf under sponsorship from
+ * the FreeBSD Foundation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+
+#include <machine/bus.h>
+#include <machine/fdt.h>
+
+#include <dev/fdt/fdt_common.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+#include <dev/uart/uart.h>
+#include <dev/uart/uart_bus.h>
+#include <dev/uart/uart_cpu.h>
+
+/*
+ * UART console routines.
+ */
+bus_space_tag_t uart_bus_space_io;
+bus_space_tag_t uart_bus_space_mem;
+
+static int
+uart_fdt_get_clock(phandle_t node, pcell_t *cell)
+{
+	pcell_t clock;
+
+	if ((OF_getprop(node, "clock-frequency", &clock,
+	    sizeof(clock))) <= 0)
+		return (ENXIO);
+
+	if (clock == 0)
+		/* Try to retrieve parent 'bus-frequency' */
+		/* XXX this should go to simple-bus fixup or so */
+		if ((OF_getprop(OF_parent(node), "bus-frequency", &clock,
+		    sizeof(clock))) <= 0)
+			clock = 0;
+
+	*cell = fdt32_to_cpu(clock);
+	return (0);
+}
+
+static int
+uart_fdt_get_shift(phandle_t node, pcell_t *cell)
+{
+	pcell_t shift;
+
+	if ((OF_getprop(node, "reg-shift", &shift, sizeof(shift))) <= 0)
+		shift = 0;
+	*cell = fdt32_to_cpu(shift);
+	return (0);
+}
+
+int
+uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
+{
+
+	return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
+}
+
+int
+uart_cpu_getdev(int devtype, struct uart_devinfo *di)
+{
+	char buf[64];
+	struct uart_class *class;
+	phandle_t node, chosen;
+	pcell_t shift, br, rclk;
+	u_long start, size, pbase, psize;
+	int err;
+
+	uart_bus_space_mem = fdtbus_bs_tag;
+	uart_bus_space_io = NULL;
+
+	/* Allow overriding the FDT uning the environment. */
+	class = &uart_ns8250_class;
+	err = uart_getenv(devtype, di, class);
+	if (!err)
+		return (0);
+
+	if (devtype != UART_DEV_CONSOLE)
+		return (ENXIO);
+
+	/*
+	 * Retrieve /chosen/std{in,out}.
+	 */
+	if ((chosen = OF_finddevice("/chosen")) == -1)
+		return (ENXIO);
+	if (OF_getprop(chosen, "stdin", buf, sizeof(buf)) <= 0)
+		return (ENXIO);
+	if ((node = OF_finddevice(buf)) == -1)
+		return (ENXIO);
+	if (OF_getprop(chosen, "stdout", buf, sizeof(buf)) <= 0)
+		return (ENXIO);
+	if (OF_finddevice(buf) != node)
+		/* Only stdin == stdout is supported. */
+		return (ENXIO);
+	/*
+	 * Retrieve serial attributes.
+	 */
+	uart_fdt_get_shift(node, &shift);
+
+	if (OF_getprop(node, "current-speed", &br, sizeof(br)) <= 0)
+		br = 0;
+	br = fdt32_to_cpu(br);
+
+	if ((err = uart_fdt_get_clock(node, &rclk)) != 0)
+		return (err);
+	/*
+	 * Finalize configuration.
+	 */
+	if (fdt_is_compatible(node, "fsl,imx-uart"))
+		class = &uart_imx_class;
+	if (fdt_is_compatible(node, "quicc"))
+		class = &uart_quicc_class;
+	if (fdt_is_compatible(node, "lpc"))
+		class = &uart_lpc_class;
+	if (fdt_is_compatible(node, "ns16550"))
+		class = &uart_ns8250_class;
+	if (fdt_is_compatible(node, "arm,pl011"))
+		class = &uart_pl011_class;
+	if (fdt_is_compatible(node, "cadence,uart"))
+		class = &uart_cdnc_class;
+
+	di->bas.chan = 0;
+	di->bas.regshft = (u_int)shift;
+	di->baudrate = br;
+	di->bas.rclk = (u_int)rclk;
+	di->ops = uart_getops(class);
+	di->databits = 8;
+	di->stopbits = 1;
+	di->parity = UART_PARITY_NONE;
+	di->bas.bst = uart_bus_space_mem;
+
+	err = fdt_regsize(node, &start, &size);
+	if (err)
+		return (ENXIO);
+	err = fdt_get_range(OF_parent(node), 0, &pbase, &psize);
+	if (err)
+		pbase = 0;
+
+	start += pbase;
+
+	return (bus_space_map(di->bas.bst, start, size, 0, &di->bas.bsh));
+}
diff --git a/sys/i386/i386/machdep.c b/sys/i386/i386/machdep.c
index 226b62b..f67f758 100644
--- a/sys/i386/i386/machdep.c
+++ b/sys/i386/i386/machdep.c
@@ -54,6 +54,7 @@ __FBSDID("$FreeBSD$");
 #include "opt_mp_watchdog.h"
 #include "opt_npx.h"
 #include "opt_perfmon.h"
+#include "opt_platform.h"
 #include "opt_xbox.h"
 #include "opt_kdtrace.h"
 
@@ -138,6 +139,9 @@ __FBSDID("$FreeBSD$");
 #ifdef SMP
 #include <machine/smp.h>
 #endif
+#ifdef FDT
+#include <x86/fdt.h>
+#endif
 
 #ifdef DEV_APIC
 #include <machine/apicvar.h>
@@ -3113,6 +3117,10 @@ init386(first)
 
 	cpu_probe_amdc1e();
 	cpu_probe_cmpxchg8b();
+
+#ifdef FDT
+	x86_init_fdt();
+#endif
 }
 #endif
 
diff --git a/sys/i386/include/fdt.h b/sys/i386/include/fdt.h
new file mode 100644
index 0000000..1a03514
--- /dev/null
+++ b/sys/i386/include/fdt.h
@@ -0,0 +1,6 @@
+/*-
+ * This file is in the public domain.
+ */
+/* $FreeBSD$ */
+
+#include <x86/fdt.h>
diff --git a/sys/i386/include/metadata.h b/sys/i386/include/metadata.h
index 4c7ec9e..73c9207 100644
--- a/sys/i386/include/metadata.h
+++ b/sys/i386/include/metadata.h
@@ -31,5 +31,6 @@
 
 #define	MODINFOMD_SMAP		0x1001
 #define	MODINFOMD_SMAP_XATTR	0x1002
+#define	MODINFOMD_DTBP		0x1003
 
 #endif /* !_MACHINE_METADATA_H_ */
diff --git a/sys/i386/include/ofw_machdep.h b/sys/i386/include/ofw_machdep.h
new file mode 100644
index 0000000..4457f85
--- /dev/null
+++ b/sys/i386/include/ofw_machdep.h
@@ -0,0 +1,6 @@
+/*-
+ * This file is in the public domain.
+ */
+/* $FreeBSD$ */
+
+#include <x86/ofw_machdep.h>
diff --git a/sys/x86/include/fdt.h b/sys/x86/include/fdt.h
new file mode 100644
index 0000000..77a0a2f
--- /dev/null
+++ b/sys/x86/include/fdt.h
@@ -0,0 +1,54 @@
+/*-
+ * Copyright (c) 2013 Juniper Networks, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _MACHINE_FDT_H_
+#define _MACHINE_FDT_H_
+
+#include <machine/intr_machdep.h>
+#include <x86/bus.h>
+
+/* Max interrupt number. */
+#define FDT_INTR_MAX	NUM_IO_INTS
+
+/* Map phandle/intpin pair to global IRQ number */
+#define	FDT_MAP_IRQ(node, pin)	\
+	    (panic("%s: FDT_MAP_IRQ(%#x, %#x)", __func__, node, pin), -1)
+
+/* Bus space tag. XXX we only support I/O port space this way. */
+#define fdtbus_bs_tag	X86_BUS_SPACE_IO
+
+struct mem_region {
+	vm_offset_t	mr_start;
+	vm_size_t	mr_size;
+};
+
+__BEGIN_DECLS
+int x86_init_fdt(void);
+__END_DECLS
+
+#endif /* _MACHINE_FDT_H_ */
diff --git a/sys/x86/include/ofw_machdep.h b/sys/x86/include/ofw_machdep.h
new file mode 100644
index 0000000..13e756e
--- /dev/null
+++ b/sys/x86/include/ofw_machdep.h
@@ -0,0 +1,36 @@
+/*-
+ * Copyright (c) 2013 Juniper Networks, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _MACHINE_OFW_MACHDEP_H_
+#define _MACHINE_OFW_MACHDEP_H_
+
+#include <x86/bus.h>
+
+typedef	uint32_t	cell_t;
+
+#endif /* _MACHINE_OFW_MACHDEP_H_ */
diff --git a/sys/x86/x86/fdt_machdep.c b/sys/x86/x86/fdt_machdep.c
new file mode 100644
index 0000000..62cf4ef
--- /dev/null
+++ b/sys/x86/x86/fdt_machdep.c
@@ -0,0 +1,77 @@
+/*-
+ * Copyright (c) 2013 Juniper Networks, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "opt_platform.h"
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/bus.h>
+#include <sys/linker.h>
+
+#include <machine/metadata.h>
+#include <x86/fdt.h>
+
+#include <dev/fdt/fdt_common.h>
+#include <dev/ofw/openfirm.h>
+
+int
+x86_init_fdt(void)
+{
+	void *dtbp, *mdp;
+	int error;
+
+	if (OF_install(OFW_FDT, 0) == FALSE) {
+		error = ENXIO;
+		goto out;
+	}
+
+	mdp = preload_search_by_type("elf kernel");
+	if (mdp == NULL)
+		mdp = preload_search_by_type("elf32 kernel");
+	dtbp = (mdp != NULL) ? MD_FETCH(mdp, MODINFOMD_DTBP, void *) : NULL;
+
+#if defined(FDT_DTB_STATIC)
+	/*
+	 * In case the device tree blob was not retrieved (from metadata) try
+	 * to use the statically embedded one.
+	 */
+	if (dtbp == NULL)
+		dtbp = &fdt_static_dtb;
+#endif
+
+	if (dtbp == NULL) {
+		error = ENOENT;
+		goto out;
+	}
+
+	error = OF_init(dtbp) ? ENXIO : 0;
+
+ out:
+	return (error);
+}