i386: move boot

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

32 files changed, 4374 insertions, 0 deletions

diff --git a/arch/x86/boot/.gitignore b/arch/x86/boot/.gitignore
new file mode 100644
index 00000000000..18465143cfa
--- /dev/null
+++ b/arch/x86/boot/.gitignore
@@ -0,0 +1,5 @@
+bootsect
+bzImage
+setup
+setup.bin
+setup.elf
diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile
new file mode 100644
index 00000000000..cb1035f2b7e
--- /dev/null
+++ b/arch/x86/boot/Makefile
@@ -0,0 +1,171 @@
+#
+# arch/x86/boot/Makefile
+#
+# This file is subject to the terms and conditions of the GNU General Public
+# License.  See the file "COPYING" in the main directory of this archive
+# for more details.
+#
+# Copyright (C) 1994 by Linus Torvalds
+#
+
+# ROOT_DEV specifies the default root-device when making the image.
+# This can be either FLOPPY, CURRENT, /dev/xxxx or empty, in which case
+# the default of FLOPPY is used by 'build'.
+
+ROOT_DEV := CURRENT
+
+# If you want to preset the SVGA mode, uncomment the next line and
+# set SVGA_MODE to whatever number you want.
+# Set it to -DSVGA_MODE=NORMAL_VGA if you just want the EGA/VGA mode.
+# The number is the same as you would ordinarily press at bootup.
+
+SVGA_MODE := -DSVGA_MODE=NORMAL_VGA
+
+# If you want the RAM disk device, define this to be the size in blocks.
+
+#RAMDISK := -DRAMDISK=512
+
+targets		:= vmlinux.bin setup.bin setup.elf zImage bzImage
+subdir- 	:= compressed
+
+setup-y		+= a20.o apm.o cmdline.o copy.o cpu.o cpucheck.o edd.o
+setup-y		+= header.o main.o mca.o memory.o pm.o pmjump.o
+setup-y		+= printf.o string.o tty.o video.o version.o voyager.o
+
+# The link order of the video-*.o modules can matter.  In particular,
+# video-vga.o *must* be listed first, followed by video-vesa.o.
+# Hardware-specific drivers should follow in the order they should be
+# probed, and video-bios.o should typically be last.
+setup-y		+= video-vga.o
+setup-y		+= video-vesa.o
+setup-y		+= video-bios.o
+targets		+= $(setup-y)
+hostprogs-y	:= tools/build
+
+HOSTCFLAGS_build.o := $(LINUXINCLUDE)
+
+# ---------------------------------------------------------------------------
+
+# How to compile the 16-bit code.  Note we always compile for -march=i386,
+# that way we can complain to the user if the CPU is insufficient.
+cflags-i386   := 
+cflags-x86_64 := -m32
+CFLAGS		:= $(LINUXINCLUDE) -g -Os -D_SETUP -D__KERNEL__ \
+		   $(cflags-$(ARCH)) \
+		   -Wall -Wstrict-prototypes \
+		   -march=i386 -mregparm=3 \
+		   -include $(srctree)/$(src)/code16gcc.h \
+		   -fno-strict-aliasing -fomit-frame-pointer \
+		   $(call cc-option, -ffreestanding) \
+		   $(call cc-option, -fno-toplevel-reorder,\
+			$(call cc-option, -fno-unit-at-a-time)) \
+		   $(call cc-option, -fno-stack-protector) \
+		   $(call cc-option, -mpreferred-stack-boundary=2)
+AFLAGS		:= $(CFLAGS) -D__ASSEMBLY__
+
+$(obj)/zImage:  IMAGE_OFFSET := 0x1000
+$(obj)/zImage:  EXTRA_AFLAGS := $(SVGA_MODE) $(RAMDISK)
+$(obj)/bzImage: IMAGE_OFFSET := 0x100000
+$(obj)/bzImage: EXTRA_CFLAGS := -D__BIG_KERNEL__
+$(obj)/bzImage: EXTRA_AFLAGS := $(SVGA_MODE) $(RAMDISK) -D__BIG_KERNEL__
+$(obj)/bzImage: BUILDFLAGS   := -b
+
+quiet_cmd_image = BUILD   $@
+cmd_image = $(obj)/tools/build $(BUILDFLAGS) $(obj)/setup.bin \
+	    $(obj)/vmlinux.bin $(ROOT_DEV) > $@
+
+$(obj)/zImage $(obj)/bzImage: $(obj)/setup.bin \
+			      $(obj)/vmlinux.bin $(obj)/tools/build FORCE
+	$(call if_changed,image)
+	@echo 'Kernel: $@ is ready' ' (#'`cat .version`')'
+
+$(obj)/vmlinux.bin: $(obj)/compressed/vmlinux FORCE
+	$(call if_changed,objcopy)
+
+SETUP_OBJS = $(addprefix $(obj)/,$(setup-y))
+
+LDFLAGS_setup.elf	:= -T
+$(obj)/setup.elf: $(src)/setup.ld $(SETUP_OBJS) FORCE
+	$(call if_changed,ld)
+
+OBJCOPYFLAGS_setup.bin	:= -O binary
+
+$(obj)/setup.bin: $(obj)/setup.elf FORCE
+	$(call if_changed,objcopy)
+
+$(obj)/compressed/vmlinux: FORCE
+	$(Q)$(MAKE) $(build)=$(obj)/compressed IMAGE_OFFSET=$(IMAGE_OFFSET) $@
+
+# Set this if you want to pass append arguments to the zdisk/fdimage/isoimage kernel
+FDARGS = 
+# Set this if you want an initrd included with the zdisk/fdimage/isoimage kernel
+FDINITRD =
+
+image_cmdline = default linux $(FDARGS) $(if $(FDINITRD),initrd=initrd.img,)
+
+$(obj)/mtools.conf: $(src)/mtools.conf.in
+	sed -e 's|@OBJ@|$(obj)|g' < $< > $@
+
+# This requires write access to /dev/fd0
+zdisk: $(BOOTIMAGE) $(obj)/mtools.conf
+	MTOOLSRC=$(obj)/mtools.conf mformat a:			; sync
+	syslinux /dev/fd0					; sync
+	echo '$(image_cmdline)' | \
+		MTOOLSRC=$(src)/mtools.conf mcopy - a:syslinux.cfg
+	if [ -f '$(FDINITRD)' ] ; then \
+		MTOOLSRC=$(obj)/mtools.conf mcopy '$(FDINITRD)' a:initrd.img ; \
+	fi
+	MTOOLSRC=$(obj)/mtools.conf mcopy $(BOOTIMAGE) a:linux	; sync
+
+# These require being root or having syslinux 2.02 or higher installed
+fdimage fdimage144: $(BOOTIMAGE) $(obj)/mtools.conf
+	dd if=/dev/zero of=$(obj)/fdimage bs=1024 count=1440
+	MTOOLSRC=$(obj)/mtools.conf mformat v:			; sync
+	syslinux $(obj)/fdimage					; sync
+	echo '$(image_cmdline)' | \
+		MTOOLSRC=$(obj)/mtools.conf mcopy - v:syslinux.cfg
+	if [ -f '$(FDINITRD)' ] ; then \
+		MTOOLSRC=$(obj)/mtools.conf mcopy '$(FDINITRD)' v:initrd.img ; \
+	fi
+	MTOOLSRC=$(obj)/mtools.conf mcopy $(BOOTIMAGE) v:linux	; sync
+
+fdimage288: $(BOOTIMAGE) $(obj)/mtools.conf
+	dd if=/dev/zero of=$(obj)/fdimage bs=1024 count=2880
+	MTOOLSRC=$(obj)/mtools.conf mformat w:			; sync
+	syslinux $(obj)/fdimage					; sync
+	echo '$(image_cmdline)' | \
+		MTOOLSRC=$(obj)/mtools.conf mcopy - w:syslinux.cfg
+	if [ -f '$(FDINITRD)' ] ; then \
+		MTOOLSRC=$(obj)/mtools.conf mcopy '$(FDINITRD)' w:initrd.img ; \
+	fi
+	MTOOLSRC=$(obj)/mtools.conf mcopy $(BOOTIMAGE) w:linux	; sync
+
+isoimage: $(BOOTIMAGE)
+	-rm -rf $(obj)/isoimage
+	mkdir $(obj)/isoimage
+	for i in lib lib64 share end ; do \
+		if [ -f /usr/$$i/syslinux/isolinux.bin ] ; then \
+			cp /usr/$$i/syslinux/isolinux.bin $(obj)/isoimage ; \
+			break ; \
+		fi ; \
+		if [ $$i = end ] ; then exit 1 ; fi ; \
+	done
+	cp $(BOOTIMAGE) $(obj)/isoimage/linux
+	echo '$(image_cmdline)' > $(obj)/isoimage/isolinux.cfg
+	if [ -f '$(FDINITRD)' ] ; then \
+		cp '$(FDINITRD)' $(obj)/isoimage/initrd.img ; \
+	fi
+	mkisofs -J -r -o $(obj)/image.iso -b isolinux.bin -c boot.cat \
+		-no-emul-boot -boot-load-size 4 -boot-info-table \
+		$(obj)/isoimage
+	rm -rf $(obj)/isoimage
+
+zlilo: $(BOOTIMAGE)
+	if [ -f $(INSTALL_PATH)/vmlinuz ]; then mv $(INSTALL_PATH)/vmlinuz $(INSTALL_PATH)/vmlinuz.old; fi
+	if [ -f $(INSTALL_PATH)/System.map ]; then mv $(INSTALL_PATH)/System.map $(INSTALL_PATH)/System.old; fi
+	cat $(BOOTIMAGE) > $(INSTALL_PATH)/vmlinuz
+	cp System.map $(INSTALL_PATH)/
+	if [ -x /sbin/lilo ]; then /sbin/lilo; else /etc/lilo/install; fi
+
+install:
+	sh $(srctree)/$(src)/install.sh $(KERNELRELEASE) $(BOOTIMAGE) System.map "$(INSTALL_PATH)"
diff --git a/arch/x86/boot/a20.c b/arch/x86/boot/a20.c
new file mode 100644
index 00000000000..31348d054fc
--- /dev/null
+++ b/arch/x86/boot/a20.c
@@ -0,0 +1,161 @@
+/* -*- linux-c -*- ------------------------------------------------------- *
+ *
+ *   Copyright (C) 1991, 1992 Linus Torvalds
+ *   Copyright 2007 rPath, Inc. - All Rights Reserved
+ *
+ *   This file is part of the Linux kernel, and is made available under
+ *   the terms of the GNU General Public License version 2.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * arch/i386/boot/a20.c
+ *
+ * Enable A20 gate (return -1 on failure)
+ */
+
+#include "boot.h"
+
+#define MAX_8042_LOOPS	100000
+
+static int empty_8042(void)
+{
+	u8 status;
+	int loops = MAX_8042_LOOPS;
+
+	while (loops--) {
+		io_delay();
+
+		status = inb(0x64);
+		if (status & 1) {
+			/* Read and discard input data */
+			io_delay();
+			(void)inb(0x60);
+		} else if (!(status & 2)) {
+			/* Buffers empty, finished! */
+			return 0;
+		}
+	}
+
+	return -1;
+}
+
+/* Returns nonzero if the A20 line is enabled.  The memory address
+   used as a test is the int $0x80 vector, which should be safe. */
+
+#define A20_TEST_ADDR	(4*0x80)
+#define A20_TEST_SHORT  32
+#define A20_TEST_LONG	2097152	/* 2^21 */
+
+static int a20_test(int loops)
+{
+	int ok = 0;
+	int saved, ctr;
+
+	set_fs(0x0000);
+	set_gs(0xffff);
+
+	saved = ctr = rdfs32(A20_TEST_ADDR);
+
+	while (loops--) {
+		wrfs32(++ctr, A20_TEST_ADDR);
+		io_delay();	/* Serialize and make delay constant */
+		ok = rdgs32(A20_TEST_ADDR+0x10) ^ ctr;
+		if (ok)
+			break;
+	}
+
+	wrfs32(saved, A20_TEST_ADDR);
+	return ok;
+}
+
+/* Quick test to see if A20 is already enabled */
+static int a20_test_short(void)
+{
+	return a20_test(A20_TEST_SHORT);
+}
+
+/* Longer test that actually waits for A20 to come on line; this
+   is useful when dealing with the KBC or other slow external circuitry. */
+static int a20_test_long(void)
+{
+	return a20_test(A20_TEST_LONG);
+}
+
+static void enable_a20_bios(void)
+{
+	asm volatile("pushfl; int $0x15; popfl"
+		     : : "a" ((u16)0x2401));
+}
+
+static void enable_a20_kbc(void)
+{
+	empty_8042();
+
+	outb(0xd1, 0x64);	/* Command write */
+	empty_8042();
+
+	outb(0xdf, 0x60);	/* A20 on */
+	empty_8042();
+}
+
+static void enable_a20_fast(void)
+{
+	u8 port_a;
+
+	port_a = inb(0x92);	/* Configuration port A */
+	port_a |=  0x02;	/* Enable A20 */
+	port_a &= ~0x01;	/* Do not reset machine */
+	outb(port_a, 0x92);
+}
+
+/*
+ * Actual routine to enable A20; return 0 on ok, -1 on failure
+ */
+
+#define A20_ENABLE_LOOPS 255	/* Number of times to try */
+
+int enable_a20(void)
+{
+	int loops = A20_ENABLE_LOOPS;
+
+#if defined(CONFIG_X86_ELAN)
+	/* Elan croaks if we try to touch the KBC */
+	enable_a20_fast();
+	while (!a20_test_long())
+		;
+	return 0;
+#elif defined(CONFIG_X86_VOYAGER)
+	/* On Voyager, a20_test() is unsafe? */
+	enable_a20_kbc();
+	return 0;
+#else
+	while (loops--) {
+		/* First, check to see if A20 is already enabled
+		   (legacy free, etc.) */
+		if (a20_test_short())
+			return 0;
+
+		/* Next, try the BIOS (INT 0x15, AX=0x2401) */
+		enable_a20_bios();
+		if (a20_test_short())
+			return 0;
+
+		/* Try enabling A20 through the keyboard controller */
+		empty_8042();
+		if (a20_test_short())
+			return 0; /* BIOS worked, but with delayed reaction */
+
+		enable_a20_kbc();
+		if (a20_test_long())
+			return 0;
+
+		/* Finally, try enabling the "fast A20 gate" */
+		enable_a20_fast();
+		if (a20_test_long())
+			return 0;
+	}
+
+	return -1;
+#endif
+}
diff --git a/arch/x86/boot/apm.c b/arch/x86/boot/apm.c
new file mode 100644
index 00000000000..eab50c55a3a
--- /dev/null
+++ b/arch/x86/boot/apm.c
@@ -0,0 +1,98 @@
+/* -*- linux-c -*- ------------------------------------------------------- *
+ *
+ *   Copyright (C) 1991, 1992 Linus Torvalds
+ *   Copyright 2007 rPath, Inc. - All Rights Reserved
+ *
+ *   Original APM BIOS checking by Stephen Rothwell, May 1994
+ *   (sfr@canb.auug.org.au)
+ *
+ *   This file is part of the Linux kernel, and is made available under
+ *   the terms of the GNU General Public License version 2.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * arch/i386/boot/apm.c
+ *
+ * Get APM BIOS information
+ */
+
+#include "boot.h"
+
+#if defined(CONFIG_APM) || defined(CONFIG_APM_MODULE)
+
+int query_apm_bios(void)
+{
+	u16 ax, bx, cx, dx, di;
+	u32 ebx, esi;
+	u8 err;
+
+	/* APM BIOS installation check */
+	ax = 0x5300;
+	bx = cx = 0;
+	asm volatile("pushl %%ebp ; int $0x15 ; popl %%ebp ; setc %0"
+		     : "=d" (err), "+a" (ax), "+b" (bx), "+c" (cx)
+		     : : "esi", "edi");
+
+	if (err)
+		return -1;		/* No APM BIOS */
+
+	if (bx != 0x504d)	/* "PM" signature */
+		return -1;
+
+	if (!(cx & 0x02))		/* 32 bits supported? */
+		return -1;
+
+	/* Disconnect first, just in case */
+	ax = 0x5304;
+	bx = 0;
+	asm volatile("pushl %%ebp ; int $0x15 ; popl %%ebp"
+		     : "+a" (ax), "+b" (bx)
+		     : : "ecx", "edx", "esi", "edi");
+
+	/* Paranoia */
+	ebx = esi = 0;
+	cx = dx = di = 0;
+
+	/* 32-bit connect */
+	asm volatile("pushl %%ebp ; int $0x15 ; popl %%ebp ; setc %6"
+		     : "=a" (ax), "+b" (ebx), "+c" (cx), "+d" (dx),
+		       "+S" (esi), "+D" (di), "=m" (err)
+		     : "a" (0x5303));
+
+	boot_params.apm_bios_info.cseg = ax;
+	boot_params.apm_bios_info.offset = ebx;
+	boot_params.apm_bios_info.cseg_16 = cx;
+	boot_params.apm_bios_info.dseg = dx;
+	boot_params.apm_bios_info.cseg_len = (u16)esi;
+	boot_params.apm_bios_info.cseg_16_len = esi >> 16;
+	boot_params.apm_bios_info.dseg_len = di;
+
+	if (err)
+		return -1;
+
+	/* Redo the installation check as the 32-bit connect;
+	   some BIOSes return different flags this way... */
+
+	ax = 0x5300;
+	bx = cx = 0;
+	asm volatile("pushl %%ebp ; int $0x15 ; popl %%ebp ; setc %0"
+		     : "=d" (err), "+a" (ax), "+b" (bx), "+c" (cx)
+		     : : "esi", "edi");
+
+	if (err || bx != 0x504d) {
+		/* Failure with 32-bit connect, try to disconect and ignore */
+		ax = 0x5304;
+		bx = 0;
+		asm volatile("pushl %%ebp ; int $0x15 ; popl %%ebp"
+			     : "+a" (ax), "+b" (bx)
+			     : : "ecx", "edx", "esi", "edi");
+		return -1;
+	}
+
+	boot_params.apm_bios_info.version = ax;
+	boot_params.apm_bios_info.flags = cx;
+	return 0;
+}
+
+#endif
diff --git a/arch/x86/boot/bitops.h b/arch/x86/boot/bitops.h
new file mode 100644
index 00000000000..8dcc8dc7db8
--- /dev/null
+++ b/arch/x86/boot/bitops.h
@@ -0,0 +1,45 @@
+/* -*- linux-c -*- ------------------------------------------------------- *
+ *
+ *   Copyright (C) 1991, 1992 Linus Torvalds
+ *   Copyright 2007 rPath, Inc. - All Rights Reserved
+ *
+ *   This file is part of the Linux kernel, and is made available under
+ *   the terms of the GNU General Public License version 2.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * arch/i386/boot/bitops.h
+ *
+ * Very simple bitops for the boot code.
+ */
+
+#ifndef BOOT_BITOPS_H
+#define BOOT_BITOPS_H
+#define _LINUX_BITOPS_H		/* Inhibit inclusion of <linux/bitops.h> */
+
+static inline int constant_test_bit(int nr, const void *addr)
+{
+	const u32 *p = (const u32 *)addr;
+	return ((1UL << (nr & 31)) & (p[nr >> 5])) != 0;
+}
+static inline int variable_test_bit(int nr, const void *addr)
+{
+	u8 v;
+	const u32 *p = (const u32 *)addr;
+
+	asm("btl %2,%1; setc %0" : "=qm" (v) : "m" (*p), "Ir" (nr));
+	return v;
+}
+
+#define test_bit(nr,addr) \
+(__builtin_constant_p(nr) ? \
+ constant_test_bit((nr),(addr)) : \
+ variable_test_bit((nr),(addr)))
+
+static inline void set_bit(int nr, void *addr)
+{
+	asm("btsl %1,%0" : "+m" (*(u32 *)addr) : "Ir" (nr));
+}
+
+#endif /* BOOT_BITOPS_H */
diff --git a/arch/x86/boot/boot.h b/arch/x86/boot/boot.h
new file mode 100644
index 00000000000..20bab9431ac
--- /dev/null
+++ b/arch/x86/boot/boot.h
@@ -0,0 +1,296 @@
+/* -*- linux-c -*- ------------------------------------------------------- *
+ *
+ *   Copyright (C) 1991, 1992 Linus Torvalds
+ *   Copyright 2007 rPath, Inc. - All Rights Reserved
+ *
+ *   This file is part of the Linux kernel, and is made available under
+ *   the terms of the GNU General Public License version 2.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * arch/i386/boot/boot.h
+ *
+ * Header file for the real-mode kernel code
+ */
+
+#ifndef BOOT_BOOT_H
+#define BOOT_BOOT_H
+
+#ifndef __ASSEMBLY__
+
+#include <stdarg.h>
+#include <linux/types.h>
+#include <linux/edd.h>
+#include <asm/boot.h>
+#include <asm/bootparam.h>
+
+/* Useful macros */
+#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
+
+extern struct setup_header hdr;
+extern struct boot_params boot_params;
+
+/* Basic port I/O */
+static inline void outb(u8 v, u16 port)
+{
+	asm volatile("outb %0,%1" : : "a" (v), "dN" (port));
+}
+static inline u8 inb(u16 port)
+{
+	u8 v;
+	asm volatile("inb %1,%0" : "=a" (v) : "dN" (port));
+	return v;
+}
+
+static inline void outw(u16 v, u16 port)
+{
+	asm volatile("outw %0,%1" : : "a" (v), "dN" (port));
+}
+static inline u16 inw(u16 port)
+{
+	u16 v;
+	asm volatile("inw %1,%0" : "=a" (v) : "dN" (port));
+	return v;
+}
+
+static inline void outl(u32 v, u16 port)
+{
+	asm volatile("outl %0,%1" : : "a" (v), "dN" (port));
+}
+static inline u32 inl(u32 port)
+{
+	u32 v;
+	asm volatile("inl %1,%0" : "=a" (v) : "dN" (port));
+	return v;
+}
+
+static inline void io_delay(void)
+{
+	const u16 DELAY_PORT = 0x80;
+	asm volatile("outb %%al,%0" : : "dN" (DELAY_PORT));
+}
+
+/* These functions are used to reference data in other segments. */
+
+static inline u16 ds(void)
+{
+	u16 seg;
+	asm("movw %%ds,%0" : "=rm" (seg));
+	return seg;
+}
+
+static inline void set_fs(u16 seg)
+{
+	asm volatile("movw %0,%%fs" : : "rm" (seg));
+}
+static inline u16 fs(void)
+{
+	u16 seg;
+	asm volatile("movw %%fs,%0" : "=rm" (seg));
+	return seg;
+}
+
+static inline void set_gs(u16 seg)
+{
+	asm volatile("movw %0,%%gs" : : "rm" (seg));
+}
+static inline u16 gs(void)
+{
+	u16 seg;
+	asm volatile("movw %%gs,%0" : "=rm" (seg));
+	return seg;
+}
+
+typedef unsigned int addr_t;
+
+static inline u8 rdfs8(addr_t addr)
+{
+	u8 v;
+	asm volatile("movb %%fs:%1,%0" : "=r" (v) : "m" (*(u8 *)addr));
+	return v;
+}
+static inline u16 rdfs16(addr_t addr)
+{
+	u16 v;
+	asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
+	return v;
+}
+static inline u32 rdfs32(addr_t addr)
+{
+	u32 v;
+	asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
+	return v;
+}
+
+static inline void wrfs8(u8 v, addr_t addr)
+{
+	asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "r" (v));
+}
+static inline void wrfs16(u16 v, addr_t addr)
+{
+	asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "r" (v));
+}
+static inline void wrfs32(u32 v, addr_t addr)
+{
+	asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "r" (v));
+}
+
+static inline u8 rdgs8(addr_t addr)
+{
+	u8 v;
+	asm volatile("movb %%gs:%1,%0" : "=r" (v) : "m" (*(u8 *)addr));
+	return v;
+}
+static inline u16 rdgs16(addr_t addr)
+{
+	u16 v;
+	asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
+	return v;
+}
+static inline u32 rdgs32(addr_t addr)
+{
+	u32 v;
+	asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
+	return v;
+}
+
+static inline void wrgs8(u8 v, addr_t addr)
+{
+	asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "r" (v));
+}
+static inline void wrgs16(u16 v, addr_t addr)
+{
+	asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "r" (v));
+}
+static inline void wrgs32(u32 v, addr_t addr)
+{
+	asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "r" (v));
+}
+
+/* Note: these only return true/false, not a signed return value! */
+static inline int memcmp(const void *s1, const void *s2, size_t len)
+{
+	u8 diff;
+	asm("repe; cmpsb; setnz %0"
+	    : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
+	return diff;
+}
+
+static inline int memcmp_fs(const void *s1, addr_t s2, size_t len)
+{
+	u8 diff;
+	asm volatile("fs; repe; cmpsb; setnz %0"
+		     : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
+	return diff;
+}
+static inline int memcmp_gs(const void *s1, addr_t s2, size_t len)
+{
+	u8 diff;
+	asm volatile("gs; repe; cmpsb; setnz %0"
+		     : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));
+	return diff;
+}
+
+static inline int isdigit(int ch)
+{
+	return (ch >= '0') && (ch <= '9');
+}
+
+/* Heap -- available for dynamic lists. */
+#define STACK_SIZE	512	/* Minimum number of bytes for stack */
+
+extern char _end[];
+extern char *HEAP;
+extern char *heap_end;
+#define RESET_HEAP() ((void *)( HEAP = _end ))
+static inline char *__get_heap(size_t s, size_t a, size_t n)
+{
+	char *tmp;
+
+	HEAP = (char *)(((size_t)HEAP+(a-1)) & ~(a-1));
+	tmp = HEAP;
+	HEAP += s*n;
+	return tmp;
+}
+#define GET_HEAP(type, n) \
+	((type *)__get_heap(sizeof(type),__alignof__(type),(n)))
+
+static inline int heap_free(void)
+{
+	return heap_end-HEAP;
+}
+
+/* copy.S */
+
+void copy_to_fs(addr_t dst, void *src, size_t len);
+void *copy_from_fs(void *dst, addr_t src, size_t len);
+void copy_to_gs(addr_t dst, void *src, size_t len);
+void *copy_from_gs(void *dst, addr_t src, size_t len);
+void *memcpy(void *dst, void *src, size_t len);
+void *memset(void *dst, int c, size_t len);
+
+#define memcpy(d,s,l) __builtin_memcpy(d,s,l)
+#define memset(d,c,l) __builtin_memset(d,c,l)
+
+/* a20.c */
+int enable_a20(void);
+
+/* apm.c */
+int query_apm_bios(void);
+
+/* cmdline.c */
+int cmdline_find_option(const char *option, char *buffer, int bufsize);
+
+/* cpu.c, cpucheck.c */
+int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr);
+int validate_cpu(void);
+
+/* edd.c */
+void query_edd(void);
+
+/* header.S */
+void __attribute__((noreturn)) die(void);
+
+/* mca.c */
+int query_mca(void);
+
+/* memory.c */
+int detect_memory(void);
+
+/* pm.c */
+void __attribute__((noreturn)) go_to_protected_mode(void);
+
+/* pmjump.S */
+void __attribute__((noreturn))
+	protected_mode_jump(u32 entrypoint, u32 bootparams);
+
+/* printf.c */
+int sprintf(char *buf, const char *fmt, ...);
+int vsprintf(char *buf, const char *fmt, va_list args);
+int printf(const char *fmt, ...);
+
+/* string.c */
+int strcmp(const char *str1, const char *str2);
+size_t strnlen(const char *s, size_t maxlen);
+unsigned int atou(const char *s);
+
+/* tty.c */
+void puts(const char *);
+void putchar(int);
+int getchar(void);
+void kbd_flush(void);
+int getchar_timeout(void);
+
+/* video.c */
+void set_video(void);
+
+/* video-vesa.c */
+void vesa_store_edid(void);
+
+/* voyager.c */
+int query_voyager(void);
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* BOOT_BOOT_H */
diff --git a/arch/x86/boot/cmdline.c b/arch/x86/boot/cmdline.c
new file mode 100644
index 00000000000..34bb778c435
--- /dev/null
+++ b/arch/x86/boot/cmdline.c
@@ -0,0 +1,97 @@
+/* -*- linux-c -*- ------------------------------------------------------- *
+ *
+ *   Copyright (C) 1991, 1992 Linus Torvalds
+ *   Copyright 2007 rPath, Inc. - All Rights Reserved
+ *
+ *   This file is part of the Linux kernel, and is made available under
+ *   the terms of the GNU General Public License version 2.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * arch/i386/boot/cmdline.c
+ *
+ * Simple command-line parser for early boot.
+ */
+
+#include "boot.h"
+
+static inline int myisspace(u8 c)
+{
+	return c <= ' ';	/* Close enough approximation */
+}
+
+/*
+ * Find a non-boolean option, that is, "option=argument".  In accordance
+ * with standard Linux practice, if this option is repeated, this returns
+ * the last instance on the command line.
+ *
+ * Returns the length of the argument (regardless of if it was
+ * truncated to fit in the buffer), or -1 on not found.
+ */
+int cmdline_find_option(const char *option, char *buffer, int bufsize)
+{
+	u32 cmdline_ptr = boot_params.hdr.cmd_line_ptr;
+	addr_t cptr;
+	char c;
+	int len = -1;
+	const char *opptr = NULL;
+	char *bufptr = buffer;
+	enum {
+		st_wordstart,	/* Start of word/after whitespace */
+		st_wordcmp,	/* Comparing this word */
+		st_wordskip,	/* Miscompare, skip */
+		st_bufcpy	/* Copying this to buffer */
+	} state = st_wordstart;
+
+	if (!cmdline_ptr || cmdline_ptr >= 0x100000)
+		return -1;	/* No command line, or inaccessible */
+
+	cptr = cmdline_ptr & 0xf;
+	set_fs(cmdline_ptr >> 4);
+
+	while (cptr < 0x10000 && (c = rdfs8(cptr++))) {
+		switch (state) {
+		case st_wordstart:
+			if (myisspace(c))
+				break;
+
+			/* else */
+			state = st_wordcmp;
+			opptr = option;
+			/* fall through */
+
+		case st_wordcmp:
+			if (c == '=' && !*opptr) {
+				len = 0;
+				bufptr = buffer;
+				state = st_bufcpy;
+			} else if (myisspace(c)) {
+				state = st_wordstart;
+			} else if (c != *opptr++) {
+				state = st_wordskip;
+			}
+			break;
+
+		case st_wordskip:
+			if (myisspace(c))
+				state = st_wordstart;
+			break;
+
+		case st_bufcpy:
+			if (myisspace(c)) {
+				state = st_wordstart;
+			} else {
+				if (len < bufsize-1)
+					*bufptr++ = c;
+				len++;
+			}
+			break;
+		}
+	}
+
+	if (bufsize)
+		*bufptr = '\0';
+
+	return len;
+}
diff --git a/arch/x86/boot/code16gcc.h b/arch/x86/boot/code16gcc.h
new file mode 100644
index 00000000000..d93e48010b6
--- /dev/null
+++ b/arch/x86/boot/code16gcc.h
@@ -0,0 +1,15 @@
+/*
+ * code16gcc.h
+ *
+ * This file is -include'd when compiling 16-bit C code.
+ * Note: this asm() needs to be emitted before gcc emits any code.
+ * Depending on gcc version, this requires -fno-unit-at-a-time or
+ * -fno-toplevel-reorder.
+ *
+ * Hopefully gcc will eventually have a real -m16 option so we can
+ * drop this hack long term.
+ */
+
+#ifndef __ASSEMBLY__
+asm(".code16gcc");
+#endif
diff --git a/arch/x86/boot/copy.S b/arch/x86/boot/copy.S
new file mode 100644
index 00000000000..ef127e56a3c
--- /dev/null
+++ b/arch/x86/boot/copy.S
@@ -0,0 +1,101 @@
+/* ----------------------------------------------------------------------- *
+ *