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x86: move suspend wakeup code to C

Browse Source 
Move wakeup code to .c, so that video mode setting code can be shared
between boot and wakeup. Remove nasty assembly code in 64-bit case by
re-using trampoline code. Stack setup was fixed to clear high 16bits
of %esp, maybe that fixes some machines.

.c code sharing and morse code was done H. Peter Anvin, Sam Ravnborg
reviewed kbuild related stuff, and it seems okay to him. Rafael did
some cleanups.

[rjw:
* Made the patch stop breaking compilation on x86-32
* Added arch/x86/kernel/acpi/sleep.h
* Got rid of compiler warnings in arch/x86/kernel/acpi/sleep.c
* Fixed 32-bit compilation on x86-64 systems
* Added include/asm-x86/trampoline.h and fixed the non-SMP
  compilation on 64-bit x86
* Removed arch/x86/kernel/acpi/sleep_32.c which was not used
* Fixed some breakage caused by the integration of smpboot.c done
  under us in the meantime]

Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Pavel Machek 2008-04-10 23:28:10 +02:00 committed by Ingo Molnar
parent f49688d459
commit e44b7b7525
34 changed files with 710 additions and 772 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/Kconfig
View File

@ -181,7 +181,7 @@ config X86_BIOS_REBOOT
config X86_TRAMPOLINE
bool
depends on X86_SMP || (X86_VOYAGER && SMP)
depends on X86_SMP || (X86_VOYAGER && SMP) || (64BIT && ACPI_SLEEP)
default y
config KTIME_SCALAR

2
arch/x86/boot/Makefile
View File

@ -30,7 +30,7 @@ subdir- := compressed
setup-y += a20.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
setup-y += printf.o string.o tty.o video.o video-mode.o version.o
setup-$(CONFIG_X86_APM_BOOT) += apm.o
setup-$(CONFIG_X86_VOYAGER) += voyager.o

5
arch/x86/boot/boot.h
View File

@ -286,6 +286,11 @@ int getchar_timeout(void);
/* video.c */
void set_video(void);
/* video-mode.c */
int set_mode(u16 mode);
int mode_defined(u16 mode);
void probe_cards(int unsafe);
/* video-vesa.c */
void vesa_store_edid(void);

6
arch/x86/boot/video-bios.c
View File

@ -50,6 +50,7 @@ static int set_bios_mode(u8 mode)
if (new_mode == mode)
return 0; /* Mode change OK */
#ifndef _WAKEUP
if (new_mode != boot_params.screen_info.orig_video_mode) {
/* Mode setting failed, but we didn't end up where we
started. That's bad. Try to revert to the original
@ -59,13 +60,18 @@ static int set_bios_mode(u8 mode)
: "+a" (ax)
: : "ebx", "ecx", "edx", "esi", "edi");
}
#endif
return -1;
}
static int bios_probe(void)
{
u8 mode;
#ifdef _WAKEUP
u8 saved_mode = 0x03;
#else
u8 saved_mode = boot_params.screen_info.orig_video_mode;
#endif
u16 crtc;
struct mode_info *mi;
int nmodes = 0;

173
arch/x86/boot/video-mode.c Normal file
View File

@ -0,0 +1,173 @@
/* -*- linux-c -*- ------------------------------------------------------- *
*
* Copyright (C) 1991, 1992 Linus Torvalds
* Copyright 2007-2008 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/video-mode.c
*
* Set the video mode. This is separated out into a different
* file in order to be shared with the ACPI wakeup code.
*/
#include "boot.h"
#include "video.h"
#include "vesa.h"
/*
* Common variables
*/
int adapter; /* 0=CGA/MDA/HGC, 1=EGA, 2=VGA+ */
u16 video_segment;
int force_x, force_y; /* Don't query the BIOS for cols/rows */
int do_restore; /* Screen contents changed during mode flip */
int graphic_mode; /* Graphic mode with linear frame buffer */
/* Probe the video drivers and have them generate their mode lists. */
void probe_cards(int unsafe)
{
struct card_info *card;
static u8 probed[2];
if (probed[unsafe])
return;
probed[unsafe] = 1;
for (card = video_cards; card < video_cards_end; card++) {
if (card->unsafe == unsafe) {
if (card->probe)
card->nmodes = card->probe();
else
card->nmodes = 0;
}
}
}
/* Test if a mode is defined */
int mode_defined(u16 mode)
{
struct card_info *card;
struct mode_info *mi;
int i;
for (card = video_cards; card < video_cards_end; card++) {
mi = card->modes;
for (i = 0; i < card->nmodes; i++, mi++) {
if (mi->mode == mode)
return 1;
}
}
return 0;
}
/* Set mode (without recalc) */
static int raw_set_mode(u16 mode, u16 *real_mode)
{
int nmode, i;
struct card_info *card;
struct mode_info *mi;
/* Drop the recalc bit if set */
mode &= ~VIDEO_RECALC;
/* Scan for mode based on fixed ID, position, or resolution */
nmode = 0;
for (card = video_cards; card < video_cards_end; card++) {
mi = card->modes;
for (i = 0; i < card->nmodes; i++, mi++) {
int visible = mi->x || mi->y;
if ((mode == nmode && visible) ||
mode == mi->mode ||
mode == (mi->y << 8)+mi->x) {
*real_mode = mi->mode;
return card->set_mode(mi);
}
if (visible)
nmode++;
}
}
/* Nothing found? Is it an "exceptional" (unprobed) mode? */
for (card = video_cards; card < video_cards_end; card++) {
if (mode >= card->xmode_first &&
mode < card->xmode_first+card->xmode_n) {
struct mode_info mix;
*real_mode = mix.mode = mode;
mix.x = mix.y = 0;
return card->set_mode(&mix);
}
}
/* Otherwise, failure... */
return -1;
}
/*
* Recalculate the vertical video cutoff (hack!)
*/
static void vga_recalc_vertical(void)
{
unsigned int font_size, rows;
u16 crtc;
u8 pt, ov;
set_fs(0);
font_size = rdfs8(0x485); /* BIOS: font size (pixels) */
rows = force_y ? force_y : rdfs8(0x484)+1; /* Text rows */
rows *= font_size; /* Visible scan lines */
rows--; /* ... minus one */
crtc = vga_crtc();
pt = in_idx(crtc, 0x11);
pt &= ~0x80; /* Unlock CR0-7 */
out_idx(pt, crtc, 0x11);
out_idx((u8)rows, crtc, 0x12); /* Lower height register */
ov = in_idx(crtc, 0x07); /* Overflow register */
ov &= 0xbd;
ov |= (rows >> (8-1)) & 0x02;
ov |= (rows >> (9-6)) & 0x40;
out_idx(ov, crtc, 0x07);
}
/* Set mode (with recalc if specified) */
int set_mode(u16 mode)
{
int rv;
u16 real_mode;
/* Very special mode numbers... */
if (mode == VIDEO_CURRENT_MODE)
return 0; /* Nothing to do... */
else if (mode == NORMAL_VGA)
mode = VIDEO_80x25;
else if (mode == EXTENDED_VGA)
mode = VIDEO_8POINT;
rv = raw_set_mode(mode, &real_mode);
if (rv)
return rv;
if (mode & VIDEO_RECALC)
vga_recalc_vertical();
/* Save the canonical mode number for the kernel, not
an alias, size specification or menu position */
#ifndef _WAKEUP
boot_params.hdr.vid_mode = real_mode;
#endif
return 0;
}

8
arch/x86/boot/video-vesa.c
View File

@ -24,7 +24,11 @@ static struct vesa_mode_info vminfo;
__videocard video_vesa;
#ifndef _WAKEUP
static void vesa_store_mode_params_graphics(void);
#else /* _WAKEUP */
static inline void vesa_store_mode_params_graphics(void) {}
#endif /* _WAKEUP */
static int vesa_probe(void)
{
@ -165,6 +169,8 @@ static int vesa_set_mode(struct mode_info *mode)
}
#ifndef _WAKEUP
/* Switch DAC to 8-bit mode */
static void vesa_dac_set_8bits(void)
{
@ -288,6 +294,8 @@ void vesa_store_edid(void)
#endif /* CONFIG_FIRMWARE_EDID */
}
#endif /* not _WAKEUP */
__videocard video_vesa =
{
.card_name = "VESA",

12
arch/x86/boot/video-vga.c
View File

@ -210,6 +210,8 @@ static int vga_set_mode(struct mode_info *mode)
*/
static int vga_probe(void)
{
u16 ega_bx;
static const char *card_name[] = {
"CGA/MDA/HGC", "EGA", "VGA"
};
@ -226,12 +228,16 @@ static int vga_probe(void)
u8 vga_flag;
asm(INT10
: "=b" (boot_params.screen_info.orig_video_ega_bx)
: "=b" (ega_bx)
: "a" (0x1200), "b" (0x10) /* Check EGA/VGA */
: "ecx", "edx", "esi", "edi");
#ifndef _WAKEUP
boot_params.screen_info.orig_video_ega_bx = ega_bx;
#endif
/* If we have MDA/CGA/HGC then BL will be unchanged at 0x10 */
if ((u8)boot_params.screen_info.orig_video_ega_bx != 0x10) {
if ((u8)ega_bx != 0x10) {
/* EGA/VGA */
asm(INT10
: "=a" (vga_flag)
@ -240,7 +246,9 @@ static int vga_probe(void)
if (vga_flag == 0x1a) {
adapter = ADAPTER_VGA;
#ifndef _WAKEUP
boot_params.screen_info.orig_video_isVGA = 1;
#endif
} else {
adapter = ADAPTER_EGA;
}

157
arch/x86/boot/video.c
View File

@ -18,21 +18,6 @@
#include "video.h"
#include "vesa.h"
/*
* Mode list variables
*/
static struct card_info cards[]; /* List of cards to probe for */
/*
* Common variables
*/
int adapter; /* 0=CGA/MDA/HGC, 1=EGA, 2=VGA+ */
u16 video_segment;
int force_x, force_y; /* Don't query the BIOS for cols/rows */
int do_restore = 0; /* Screen contents changed during mode flip */
int graphic_mode; /* Graphic mode with linear frame buffer */
static void store_cursor_position(void)
{
u16 curpos;
@ -107,147 +92,6 @@ static void store_mode_params(void)
boot_params.screen_info.orig_video_lines = y;
}
/* Probe the video drivers and have them generate their mode lists. */
static void probe_cards(int unsafe)
{
struct card_info *card;
static u8 probed[2];
if (probed[unsafe])
return;
probed[unsafe] = 1;
for (card = video_cards; card < video_cards_end; card++) {
if (card->unsafe == unsafe) {
if (card->probe)
card->nmodes = card->probe();
else
card->nmodes = 0;
}
}
}
/* Test if a mode is defined */
int mode_defined(u16 mode)
{
struct card_info *card;
struct mode_info *mi;
int i;
for (card = video_cards; card < video_cards_end; card++) {
mi = card->modes;
for (i = 0; i < card->nmodes; i++, mi++) {
if (mi->mode == mode)
return 1;
}
}
return 0;
}
/* Set mode (without recalc) */
static int raw_set_mode(u16 mode, u16 *real_mode)
{
int nmode, i;
struct card_info *card;
struct mode_info *mi;
/* Drop the recalc bit if set */
mode &= ~VIDEO_RECALC;
/* Scan for mode based on fixed ID, position, or resolution */
nmode = 0;
for (card = video_cards; card < video_cards_end; card++) {
mi = card->modes;
for (i = 0; i < card->nmodes; i++, mi++) {
int visible = mi->x || mi->y;
if ((mode == nmode && visible) ||
mode == mi->mode ||
mode == (mi->y << 8)+mi->x) {
*real_mode = mi->mode;
return card->set_mode(mi);
}
if (visible)
nmode++;
}
}
/* Nothing found? Is it an "exceptional" (unprobed) mode? */
for (card = video_cards; card < video_cards_end; card++) {
if (mode >= card->xmode_first &&
mode < card->xmode_first+card->xmode_n) {
struct mode_info mix;
*real_mode = mix.mode = mode;
mix.x = mix.y = 0;
return card->set_mode(&mix);
}
}
/* Otherwise, failure... */
return -1;
}
/*
* Recalculate the vertical video cutoff (hack!)
*/
static void vga_recalc_vertical(void)
{
unsigned int font_size, rows;
u16 crtc;
u8 pt, ov;
set_fs(0);
font_size = rdfs8(0x485); /* BIOS: font size (pixels) */
rows = force_y ? force_y : rdfs8(0x484)+1; /* Text rows */
rows *= font_size; /* Visible scan lines */
rows--; /* ... minus one */
crtc = vga_crtc();
pt = in_idx(crtc, 0x11);
pt &= ~0x80; /* Unlock CR0-7 */
out_idx(pt, crtc, 0x11);
out_idx((u8)rows, crtc, 0x12); /* Lower height register */
ov = in_idx(crtc, 0x07); /* Overflow register */
ov &= 0xbd;
ov |= (rows >> (8-1)) & 0x02;
ov |= (rows >> (9-6)) & 0x40;
out_idx(ov, crtc, 0x07);
}
/* Set mode (with recalc if specified) */
static int set_mode(u16 mode)
{
int rv;
u16 real_mode;
/* Very special mode numbers... */
if (mode == VIDEO_CURRENT_MODE)
return 0; /* Nothing to do... */
else if (mode == NORMAL_VGA)
mode = VIDEO_80x25;
else if (mode == EXTENDED_VGA)
mode = VIDEO_8POINT;
rv = raw_set_mode(mode, &real_mode);
if (rv)
return rv;
if (mode & VIDEO_RECALC)
vga_recalc_vertical();
/* Save the canonical mode number for the kernel, not
an alias, size specification or menu position */
boot_params.hdr.vid_mode = real_mode;
return 0;
}
static unsigned int get_entry(void)
{
char entry_buf[4];
@ -486,6 +330,7 @@ void set_video(void)
printf("Undefined video mode number: %x\n", mode);
mode = ASK_VGA;
}
boot_params.hdr.vid_mode = mode;
vesa_store_edid();
store_mode_params();

9
arch/x86/kernel/acpi/Makefile
View File

@ -1,7 +1,14 @@
subdir- := realmode
obj-$(CONFIG_ACPI) += boot.o
obj-$(CONFIG_ACPI_SLEEP) += sleep.o wakeup_$(BITS).o
obj-$(CONFIG_ACPI_SLEEP) += sleep.o wakeup_rm.o wakeup_$(BITS).o
ifneq ($(CONFIG_ACPI_PROCESSOR),)
obj-y += cstate.o processor.o
endif
$(obj)/wakeup_rm.o: $(obj)/realmode/wakeup.bin
$(obj)/realmode/wakeup.bin: FORCE
$(Q)$(MAKE) $(build)=$(obj)/realmode $@

57
arch/x86/kernel/acpi/realmode/Makefile Normal file
View File

@ -0,0 +1,57 @@
#
# arch/x86/kernel/acpi/realmode/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.
#
targets := wakeup.bin wakeup.elf
wakeup-y += wakeup.o wakemain.o video-mode.o copy.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.
wakeup-y += video-vga.o
wakeup-y += video-vesa.o
wakeup-y += video-bios.o
targets += $(wakeup-y)
bootsrc := $(src)/../../../boot
# ---------------------------------------------------------------------------
# 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.
# Compile with _SETUP since this is similar to the boot-time setup code.
KBUILD_CFLAGS := $(LINUXINCLUDE) -g -Os -D_SETUP -D_WAKEUP -D__KERNEL__ \
-I$(srctree)/$(bootsrc) \
$(cflags-y) \
-Wall -Wstrict-prototypes \
-march=i386 -mregparm=3 \
-include $(srctree)/$(bootsrc)/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)
KBUILD_CFLAGS += $(call cc-option, -m32)
KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__
WAKEUP_OBJS = $(addprefix $(obj)/,$(wakeup-y))
LDFLAGS_wakeup.elf := -T
CPPFLAGS_wakeup.lds += -P -C
$(obj)/wakeup.elf: $(src)/wakeup.lds $(WAKEUP_OBJS) FORCE
$(call if_changed,ld)
OBJCOPYFLAGS_wakeup.bin := -O binary
$(obj)/wakeup.bin: $(obj)/wakeup.elf FORCE
$(call if_changed,objcopy)

1
arch/x86/kernel/acpi/realmode/copy.S Normal file
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@ -0,0 +1 @@
#include "../../../boot/copy.S"

1
arch/x86/kernel/acpi/realmode/video-bios.c Normal file
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@ -0,0 +1 @@
#include "../../../boot/video-bios.c"

1
arch/x86/kernel/acpi/realmode/video-mode.c Normal file
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@ -0,0 +1 @@
#include "../../../boot/video-mode.c"

1
arch/x86/kernel/acpi/realmode/video-vesa.c Normal file
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@ -0,0 +1 @@
#include "../../../boot/video-vesa.c"

1
arch/x86/kernel/acpi/realmode/video-vga.c Normal file
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@ -0,0 +1 @@
#include "../../../boot/video-vga.c"

81
arch/x86/kernel/acpi/realmode/wakemain.c Normal file
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@ -0,0 +1,81 @@
#include "wakeup.h"
#include "boot.h"
static void udelay(int loops)
{
while (loops--)
io_delay(); /* Approximately 1 us */
}
static void beep(unsigned int hz)
{
u8 enable;
if (!hz) {
enable = 0x00; /* Turn off speaker */
} else {
u16 div = 1193181/hz;
outb(0xb6, 0x43); /* Ctr 2, squarewave, load, binary */
io_delay();
outb(div, 0x42); /* LSB of counter */
io_delay();
outb(div >> 8, 0x42); /* MSB of counter */
io_delay();
enable = 0x03; /* Turn on speaker */
}
inb(0x61); /* Dummy read of System Control Port B */
io_delay();
outb(enable, 0x61); /* Enable timer 2 output to speaker */
io_delay();
}
#define DOT_HZ 880
#define DASH_HZ 587
#define US_PER_DOT 125000
/* Okay, this is totally silly, but it's kind of fun. */
static void send_morse(const char *pattern)
{
char s;
while ((s = *pattern++)) {
switch (s) {
case '.':
beep(DOT_HZ);
udelay(US_PER_DOT);
beep(0);
udelay(US_PER_DOT);
break;
case '-':
beep(DASH_HZ);
udelay(US_PER_DOT * 3);
beep(0);
udelay(US_PER_DOT);
break;
default: /* Assume it's a space */
udelay(US_PER_DOT * 3);
break;
}
}
}
void main(void)
{
/* Kill machine if structures are wrong */
if (wakeup_header.real_magic != 0x12345678)
while (1);
if (wakeup_header.realmode_flags & 4)
send_morse("...-");
if (wakeup_header.realmode_flags & 1)
asm volatile("lcallw $0xc000,$3");
if (wakeup_header.realmode_flags & 2) {
/* Need to call BIOS */
probe_cards(0);
set_mode(wakeup_header.video_mode);
}
}

113
arch/x86/kernel/acpi/realmode/wakeup.S Normal file
View File

@ -0,0 +1,113 @@
/*
* ACPI wakeup real mode startup stub
*/
#include <asm/segment.h>
#include <asm/msr-index.h>
#include <asm/page.h>
#include <asm/pgtable.h>
.code16
.section ".header", "a"
/* This should match the structure in wakeup.h */
.globl wakeup_header
wakeup_header:
video_mode: .short 0 /* Video mode number */
pmode_return: .byte 0x66, 0xea /* ljmpl */
.long 0 /* offset goes here */
.short __KERNEL_CS
pmode_cr0: .long 0 /* Saved %cr0 */
pmode_cr3: .long 0 /* Saved %cr3 */
pmode_cr4: .long 0 /* Saved %cr4 */
pmode_efer: .quad 0 /* Saved EFER */
pmode_gdt: .quad 0
realmode_flags: .long 0
real_magic: .long 0
trampoline_segment: .word 0
signature: .long 0x51ee1111
.text
.globl _start
.code16
wakeup_code:
_start:
cli
cld
/* Set up segments */
movw %cs, %ax
movw %ax, %ds
movw %ax, %es
movw %ax, %ss
movl $wakeup_stack_end, %esp
/* Clear the EFLAGS */
pushl $0
popfl
/* Check header signature... */
movl signature, %eax
cmpl $0x51ee1111, %eax
jne bogus_real_magic
/* Check we really have everything... */
movl end_signature, %eax
cmpl $0x65a22c82, %eax
jne bogus_real_magic
/* Call the C code */
calll main
/* Do any other stuff... */
#ifndef CONFIG_64BIT
/* This could also be done in C code... */
movl pmode_cr3, %eax
movl %eax, %cr3
movl pmode_cr4, %ecx
jecxz 1f
movl %ecx, %cr4
1:
movl pmode_efer, %eax
movl pmode_efer + 4, %edx
movl %eax, %ecx
orl %edx, %ecx
jz 1f
movl $0xc0000080, %ecx
wrmsr
1:
lgdtl pmode_gdt
/* This really couldn't... */
movl pmode_cr0, %eax
movl %eax, %cr0
jmp pmode_return
#else
pushw $0
pushw trampoline_segment
pushw $0
lret
#endif
bogus_real_magic:
1:
hlt
jmp 1b
.data
.balign 4
.globl HEAP, heap_end
HEAP:
.long wakeup_heap
heap_end:
.long wakeup_stack
.bss
wakeup_heap:
.space 2048
wakeup_stack:
.space 2048
wakeup_stack_end:

36
arch/x86/kernel/acpi/realmode/wakeup.h Normal file
View File

@ -0,0 +1,36 @@
/*
* Definitions for the wakeup data structure at the head of the
* wakeup code.
*/
#ifndef ARCH_X86_KERNEL_ACPI_RM_WAKEUP_H
#define ARCH_X86_KERNEL_ACPI_RM_WAKEUP_H
#ifndef __ASSEMBLY__
#include <linux/types.h>
/* This must match data at wakeup.S */
struct wakeup_header {
u16 video_mode; /* Video mode number */
u16 _jmp1; /* ljmpl opcode, 32-bit only */
u32 pmode_entry; /* Protected mode resume point, 32-bit only */
u16 _jmp2; /* CS value, 32-bit only */
u32 pmode_cr0; /* Protected mode cr0 */
u32 pmode_cr3; /* Protected mode cr3 */
u32 pmode_cr4; /* Protected mode cr4 */
u32 pmode_efer_low; /* Protected mode EFER */
u32 pmode_efer_high;
u64 pmode_gdt;
u32 realmode_flags;
u32 real_magic;
u16 trampoline_segment; /* segment with trampoline code, 64-bit only */
u32 signature; /* To check we have correct structure */
} __attribute__((__packed__));
extern struct wakeup_header wakeup_header;
#endif
#define HEADER_OFFSET 0x3f00
#define WAKEUP_SIZE 0x4000
#endif /* ARCH_X86_KERNEL_ACPI_RM_WAKEUP_H */

61
arch/x86/kernel/acpi/realmode/wakeup.lds.S Normal file
View File

@ -0,0 +1,61 @@
/*
* wakeup.ld
*
* Linker script for the real-mode wakeup code
*/
#undef i386
#include "wakeup.h"
OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
OUTPUT_ARCH(i386)
ENTRY(_start)
SECTIONS
{
. = HEADER_OFFSET;
.header : {
*(.header)
}
. = 0;
.text : {
*(.text*)
}
. = ALIGN(16);
.rodata : {
*(.rodata*)
}
.videocards : {
video_cards = .;
*(.videocards)
video_cards_end = .;
}
. = ALIGN(16);
.data : {
*(.data*)
}
.signature : {
end_signature = .;
LONG(0x65a22c82)
}
. = ALIGN(16);
.bss : {
__bss_start = .;
*(.bss)
__bss_end = .;
}
. = ALIGN(16);
_end = .;
/DISCARD/ : {
*(.note*)
}
. = ASSERT(_end <= WAKEUP_SIZE, "Wakeup too big!");
}

71
arch/x86/kernel/acpi/sleep.c
View File

@ -10,30 +10,72 @@
#include <linux/dmi.h>
#include <linux/cpumask.h>
#include <asm/smp.h>
#include "realmode/wakeup.h"
#include "sleep.h"
/* address in low memory of the wakeup routine. */
unsigned long acpi_wakeup_address;
unsigned long acpi_realmode_flags;
extern char wakeup_start, wakeup_end;
extern unsigned long acpi_copy_wakeup_routine(unsigned long);
/* address in low memory of the wakeup routine. */
static unsigned long acpi_realmode;
#ifdef CONFIG_64BIT
static char temp_stack[10240];
#endif
/**
* acpi_save_state_mem - save kernel state
*
* Create an identity mapped page table and copy the wakeup routine to
* low memory.
*
* Note that this is too late to change acpi_wakeup_address.
*/
int acpi_save_state_mem(void)
{
if (!acpi_wakeup_address) {
printk(KERN_ERR "Could not allocate memory during boot, S3 disabled\n");
struct wakeup_header *header;
if (!acpi_realmode) {
printk(KERN_ERR "Could not allocate memory during boot, "
"S3 disabled\n");
return -ENOMEM;
}
memcpy((void *)acpi_wakeup_address, &wakeup_start,
&wakeup_end - &wakeup_start);
acpi_copy_wakeup_routine(acpi_wakeup_address);
memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET);
if (header->signature != 0x51ee1111) {
printk(KERN_ERR "wakeup header does not match\n");
return -EINVAL;
}
header->video_mode = saved_video_mode;
#ifndef CONFIG_64BIT
store_gdt((struct desc_ptr *)&header->pmode_gdt);
header->pmode_efer_low = nx_enabled;
if (header->pmode_efer_low & 1) {
/* This is strange, why not save efer, always? */
rdmsr(MSR_EFER, header->pmode_efer_low,
header->pmode_efer_high);
}
#endif /* !CONFIG_64BIT */
header->pmode_cr0 = read_cr0();
header->pmode_cr4 = read_cr4();
header->realmode_flags = acpi_realmode_flags;
header->real_magic = 0x12345678;
#ifndef CONFIG_64BIT
header->pmode_entry = (u32)&wakeup_pmode_return;
header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET);
saved_magic = 0x12345678;
#else /* CONFIG_64BIT */
header->trampoline_segment = setup_trampoline() >> 4;
init_rsp = (unsigned long)temp_stack + 4096;
initial_code = (unsigned long)wakeup_long64;
saved_magic = 0x123456789abcdef0;
#endif /* CONFIG_64BIT */
return 0;
}
@ -56,15 +98,20 @@ void acpi_restore_state_mem(void)
*/
void __init acpi_reserve_bootmem(void)
{
if ((&wakeup_end - &wakeup_start) > PAGE_SIZE*2) {
if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
printk(KERN_ERR
"ACPI: Wakeup code way too big, S3 disabled.\n");
return;
}
acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE*2);
if (!acpi_wakeup_address)
acpi_realmode = (unsigned long)alloc_bootmem_low(WAKEUP_SIZE);
if (!acpi_realmode) {
printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
return;
}
acpi_wakeup_address = acpi_realmode;
}

16
arch/x86/kernel/acpi/sleep.h Normal file
View File

@ -0,0 +1,16 @@
/*
* Variables and functions used by the code in sleep.c
*/
#include <asm/trampoline.h>
extern char wakeup_code_start, wakeup_code_end;
extern unsigned long saved_video_mode;
extern long saved_magic;
extern int wakeup_pmode_return;
extern char swsusp_pg_dir[PAGE_SIZE];
extern unsigned long acpi_copy_wakeup_routine(unsigned long);
extern void wakeup_long64(void);

40
arch/x86/kernel/acpi/sleep_32.c
View File

@ -1,40 +0,0 @@
/*
* sleep.c - x86-specific ACPI sleep support.
*
* Copyright (C) 2001-2003 Patrick Mochel
* Copyright (C) 2001-2003 Pavel Machek <pavel@suse.cz>
*/
#include <linux/acpi.h>
#include <linux/bootmem.h>
#include <linux/dmi.h>
#include <linux/cpumask.h>
#include <asm/smp.h>
/* Ouch, we want to delete this. We already have better version in userspace, in
s2ram from suspend.sf.net project */
static __init int reset_videomode_after_s3(const struct dmi_system_id *d)
{
acpi_realmode_flags |= 2;
return 0;
}
static __initdata struct dmi_system_id acpisleep_dmi_table[] = {
{ /* Reset video mode after returning from ACPI S3 sleep */
.callback = reset_videomode_after_s3,
.ident = "Toshiba Satellite 4030cdt",
.matches = {
DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),
},
},
{}
};
static int __init acpisleep_dmi_init(void)
{
dmi_check_system(acpisleep_dmi_table);
return 0;
}
core_initcall(acpisleep_dmi_init);

225
arch/x86/kernel/acpi/wakeup_32.S
View File

@ -3,178 +3,12 @@
#include <asm/segment.h>
#include <asm/page.h>
#
# wakeup_code runs in real mode, and at unknown address (determined at run-time).
# Therefore it must only use relative jumps/calls.
#
# Do we need to deal with A20? It is okay: ACPI specs says A20 must be enabled
#
# If physical address of wakeup_code is 0x12345, BIOS should call us with
# cs = 0x1234, eip = 0x05
#
#define BEEP \
inb $97, %al; \
outb %al, $0x80; \
movb $3, %al; \
outb %al, $97; \
outb %al, $0x80; \
movb $-74, %al; \
outb %al, $67; \
outb %al, $0x80; \
movb $-119, %al; \
outb %al, $66; \
outb %al, $0x80; \
movb $15, %al; \
outb %al, $66;
ALIGN
.align 4096
ENTRY(wakeup_start)
wakeup_code:
wakeup_code_start = .
.code16
cli
cld
# setup data segment
movw %cs, %ax
movw %ax, %ds # Make ds:0 point to wakeup_start
movw %ax, %ss
testl $4, realmode_flags - wakeup_code
jz 1f
BEEP
1:
mov $(wakeup_stack - wakeup_code), %sp # Private stack is needed for ASUS board
pushl $0 # Kill any dangerous flags
popfl
movl real_magic - wakeup_code, %eax
cmpl $0x12345678, %eax
jne bogus_real_magic
testl $1, realmode_flags - wakeup_code
jz 1f
lcall $0xc000,$3
movw %cs, %ax
movw %ax, %ds # Bios might have played with that
movw %ax, %ss
1:
testl $2, realmode_flags - wakeup_code
jz 1f
mov video_mode - wakeup_code, %ax
call mode_set
1:
# set up page table
movl $swsusp_pg_dir-__PAGE_OFFSET, %eax
movl %eax, %cr3
testl $1, real_efer_save_restore - wakeup_code
jz 4f
# restore efer setting
movl real_save_efer_edx - wakeup_code, %edx
movl real_save_efer_eax - wakeup_code, %eax
mov $0xc0000080, %ecx
wrmsr
4:
# make sure %cr4 is set correctly (features, etc)
movl real_save_cr4 - wakeup_code, %eax
movl %eax, %cr4
# need a gdt -- use lgdtl to force 32-bit operands, in case
# the GDT is located past 16 megabytes.
lgdtl real_save_gdt - wakeup_code
movl real_save_cr0 - wakeup_code, %eax
movl %eax, %cr0
jmp 1f
1:
movl real_magic - wakeup_code, %eax
cmpl $0x12345678, %eax
jne bogus_real_magic
testl $8, realmode_flags - wakeup_code
jz 1f
BEEP
1:
ljmpl $__KERNEL_CS, $wakeup_pmode_return
real_save_gdt: .word 0
.long 0
real_save_cr0: .long 0
real_save_cr3: .long 0
real_save_cr4: .long 0
real_magic: .long 0
video_mode: .long 0
realmode_flags: .long 0
real_efer_save_restore: .long 0
real_save_efer_edx: .long 0
real_save_efer_eax: .long 0
bogus_real_magic:
jmp bogus_real_magic
/* This code uses an extended set of video mode numbers. These include:
* Aliases for standard modes
* NORMAL_VGA (-1)
* EXTENDED_VGA (-2)
* ASK_VGA (-3)
* Video modes numbered by menu position -- NOT RECOMMENDED because of lack
* of compatibility when extending the table. These are between 0x00 and 0xff.
*/
#define VIDEO_FIRST_MENU 0x0000
/* Standard BIOS video modes (BIOS number + 0x0100) */
#define VIDEO_FIRST_BIOS 0x0100
/* VESA BIOS video modes (VESA number + 0x0200) */
#define VIDEO_FIRST_VESA 0x0200
/* Video7 special modes (BIOS number + 0x0900) */
#define VIDEO_FIRST_V7 0x0900
# Setting of user mode (AX=mode ID) => CF=success
# For now, we only handle VESA modes (0x0200..0x03ff). To handle other
# modes, we should probably compile in the video code from the boot
# directory.
mode_set:
movw %ax, %bx
subb $VIDEO_FIRST_VESA>>8, %bh
cmpb $2, %bh
jb check_vesa
setbad:
clc
ret
check_vesa:
orw $0x4000, %bx # Use linear frame buffer
movw $0x4f02, %ax # VESA BIOS mode set call
int $0x10
cmpw $0x004f, %ax # AL=4f if implemented
jnz setbad # AH=0 if OK
stc
ret
# Copyright 2003, 2008 Pavel Machek <pavel@suse.cz>, distribute under GPLv2
.code32
ALIGN
.org 0x800
wakeup_stack_begin: # Stack grows down
.org 0xff0 # Just below end of page
wakeup_stack:
ENTRY(wakeup_end)
.org 0x1000
ENTRY(wakeup_pmode_return)
wakeup_pmode_return:
movw $__KERNEL_DS, %ax
movw %ax, %ss
@ -187,7 +21,7 @@ wakeup_pmode_return:
lgdt saved_gdt
lidt saved_idt
lldt saved_ldt
ljmp $(__KERNEL_CS),$1f
ljmp $(__KERNEL_CS), $1f
1:
movl %cr3, %eax
movl %eax, %cr3
@ -201,70 +35,28 @@ wakeup_pmode_return:
jne bogus_magic
# jump to place where we left off
movl saved_eip,%eax
movl saved_eip, %eax
jmp *%eax
bogus_magic:
jmp bogus_magic
##
# acpi_copy_wakeup_routine
#
# Copy the above routine to low memory.
#
# Parameters:
# %eax: place to copy wakeup routine to
#
# Returned address is location of code in low memory (past data and stack)
#
ENTRY(acpi_copy_wakeup_routine)
pushl %ebx
save_registers:
sgdt saved_gdt
sidt saved_idt
sldt saved_ldt
str saved_tss
movl nx_enabled, %edx
movl %edx, real_efer_save_restore - wakeup_start (%eax)
testl $1, real_efer_save_restore - wakeup_start (%eax)
jz 2f
# save efer setting
pushl %eax
movl %eax, %ebx
mov $0xc0000080, %ecx
rdmsr
movl %edx, real_save_efer_edx - wakeup_start (%ebx)
movl %eax, real_save_efer_eax - wakeup_start (%ebx)
popl %eax
2:
movl %cr3, %edx
movl %edx, real_save_cr3 - wakeup_start (%eax)
movl %cr4, %edx
movl %edx, real_save_cr4 - wakeup_start (%eax)
movl %cr0, %edx
movl %edx, real_save_cr0 - wakeup_start (%eax)
sgdt real_save_gdt - wakeup_start (%eax)
movl saved_videomode, %edx
movl %edx, video_mode - wakeup_start (%eax)
movl acpi_realmode_flags, %edx
movl %edx, realmode_flags - wakeup_start (%eax)
movl $0x12345678, real_magic - wakeup_start (%eax)
movl $0x12345678, saved_magic
popl %ebx
ret
save_registers:
leal 4(%esp), %eax
movl %eax, saved_context_esp
movl %ebx, saved_context_ebx
movl %ebp, saved_context_ebp
movl %esi, saved_context_esi
movl %edi, saved_context_edi
pushfl ; popl saved_context_eflags
pushfl
popl saved_context_eflags
movl $ret_point, saved_eip
ret
@ -275,7 +67,8 @@ restore_registers:
movl saved_context_ebx, %ebx
movl saved_context_esi, %esi
movl saved_context_edi, %edi
pushl saved_context_eflags ; popfl
pushl saved_context_eflags
popfl
ret
ENTRY(do_suspend_lowlevel)

303
arch/x86/kernel/acpi/wakeup_64.S
View File

@ -7,191 +7,18 @@
#include <asm/asm-offsets.h>
# Copyright 2003 Pavel Machek <pavel@suse.cz>, distribute under GPLv2
#
# wakeup_code runs in real mode, and at unknown address (determined at run-time).
# Therefore it must only use relative jumps/calls.
#
# Do we need to deal with A20? It is okay: ACPI specs says A20 must be enabled
#
# If physical address of wakeup_code is 0x12345, BIOS should call us with
# cs = 0x1234, eip = 0x05
#
#define BEEP \
inb $97, %al; \
outb %al, $0x80; \
movb $3, %al; \
outb %al, $97; \
outb %al, $0x80; \
movb $-74, %al; \
outb %al, $67; \
outb %al, $0x80; \
movb $-119, %al; \
outb %al, $66; \
outb %al, $0x80; \
movb $15, %al; \
outb %al, $66;
ALIGN
.align 16
ENTRY(wakeup_start)
wakeup_code:
wakeup_code_start = .
.code16
# Running in *copy* of this code, somewhere in low 1MB.
cli
cld
# setup data segment
movw %cs, %ax
movw %ax, %ds # Make ds:0 point to wakeup_start
movw %ax, %ss
# Data segment must be set up before we can see whether to beep.
testl $4, realmode_flags - wakeup_code
jz 1f
BEEP
1:
# Private stack is needed for ASUS board
mov $(wakeup_stack - wakeup_code), %sp
pushl $0 # Kill any dangerous flags
popfl
movl real_magic - wakeup_code, %eax
cmpl $0x12345678, %eax
jne bogus_real_magic
testl $1, realmode_flags - wakeup_code
jz 1f
lcall $0xc000,$3
movw %cs, %ax
movw %ax, %ds # Bios might have played with that
movw %ax, %ss
1:
testl $2, realmode_flags - wakeup_code
jz 1f
mov video_mode - wakeup_code, %ax
call mode_set
1:
mov %ds, %ax # Find 32bit wakeup_code addr
movzx %ax, %esi # (Convert %ds:gdt to a liner ptr)
shll $4, %esi
# Fix up the vectors
addl %esi, wakeup_32_vector - wakeup_code
addl %esi, wakeup_long64_vector - wakeup_code
addl %esi, gdt_48a + 2 - wakeup_code # Fixup the gdt pointer
lidtl %ds:idt_48a - wakeup_code
lgdtl %ds:gdt_48a - wakeup_code # load gdt with whatever is
# appropriate
movl $1, %eax # protected mode (PE) bit
lmsw %ax # This is it!
jmp 1f
1:
ljmpl *(wakeup_32_vector - wakeup_code)
.balign 4
wakeup_32_vector:
.long wakeup_32 - wakeup_code
.word __KERNEL32_CS, 0
.code32
wakeup_32:
# Running in this code, but at low address; paging is not yet turned on.
movl $__KERNEL_DS, %eax
movl %eax, %ds
/*
* Prepare for entering 64bits mode
*/
/* Enable PAE */
xorl %eax, %eax
btsl $5, %eax
movl %eax, %cr4
/* Setup early boot stage 4 level pagetables */
leal (wakeup_level4_pgt - wakeup_code)(%esi), %eax
movl %eax, %cr3
/* Check if nx is implemented */
movl $0x80000001, %eax
cpuid
movl %edx,%edi
/* Enable Long Mode */
xorl %eax, %eax
btsl $_EFER_LME, %eax
/* No Execute supported? */
btl $20,%edi
jnc 1f
btsl $_EFER_NX, %eax
/* Make changes effective */
1: movl $MSR_EFER, %ecx
xorl %edx, %edx
wrmsr
xorl %eax, %eax
btsl $31, %eax /* Enable paging and in turn activate Long Mode */
btsl $0, %eax /* Enable protected mode */
/* Make changes effective */
movl %eax, %cr0
/* At this point:
CR4.PAE must be 1
CS.L must be 0
CR3 must point to PML4
Next instruction must be a branch
This must be on identity-mapped page
*/
/*
* At this point we're in long mode but in 32bit compatibility mode
* with EFER.LME = 1, CS.L = 0, CS.D = 1 (and in turn
* EFER.LMA = 1). Now we want to jump in 64bit mode, to do that we load
* the new gdt/idt that has __KERNEL_CS with CS.L = 1.
*/
/* Finally jump in 64bit mode */
ljmp *(wakeup_long64_vector - wakeup_code)(%esi)
.balign 4
wakeup_long64_vector:
.long wakeup_long64 - wakeup_code
.word __KERNEL_CS, 0
.code64
/* Hooray, we are in Long 64-bit mode (but still running in
* low memory)
*/
wakeup_long64:
/*
* We must switch to a new descriptor in kernel space for the GDT
* because soon the kernel won't have access anymore to the userspace
* addresses where we're currently running on. We have to do that here
* because in 32bit we couldn't load a 64bit linear address.
* Hooray, we are in Long 64-bit mode (but still running in low memory)
*/
lgdt cpu_gdt_descr
ENTRY(wakeup_long64)
wakeup_long64:
movq saved_magic, %rax
movq $0x123456789abcdef0, %rdx
cmpq %rdx, %rax
jne bogus_64_magic
nop
nop
movw $__KERNEL_DS, %ax
movw %ax, %ss
movw %ax, %ds
@ -208,131 +35,9 @@ wakeup_long64:
movq saved_rip, %rax
jmp *%rax
.code32
.align 64
gdta:
/* Its good to keep gdt in sync with one in trampoline.S */
.word 0, 0, 0, 0 # dummy
/* ??? Why I need the accessed bit set in order for this to work? */
.quad 0x00cf9b000000ffff # __KERNEL32_CS
.quad 0x00af9b000000ffff # __KERNEL_CS
.quad 0x00cf93000000ffff # __KERNEL_DS
idt_48a:
.word 0 # idt limit = 0
.word 0, 0 # idt base = 0L
gdt_48a:
.word 0x800 # gdt limit=2048,
# 256 GDT entries
.long gdta - wakeup_code # gdt base (relocated in later)
real_magic: .quad 0
video_mode: .quad 0
realmode_flags: .quad 0
.code16
bogus_real_magic:
jmp bogus_real_magic
.code64
bogus_64_magic:
jmp bogus_64_magic
/* This code uses an extended set of video mode numbers. These include:
* Aliases for standard modes
* NORMAL_VGA (-1)
* EXTENDED_VGA (-2)
* ASK_VGA (-3)
* Video modes numbered by menu position -- NOT RECOMMENDED because of lack
* of compatibility when extending the table. These are between 0x00 and 0xff.
*/
#define VIDEO_FIRST_MENU 0x0000
/* Standard BIOS video modes (BIOS number + 0x0100) */
#define VIDEO_FIRST_BIOS 0x0100
/* VESA BIOS video modes (VESA number + 0x0200) */
#define VIDEO_FIRST_VESA 0x0200
/* Video7 special modes (BIOS number + 0x0900) */
#define VIDEO_FIRST_V7 0x0900
# Setting of user mode (AX=mode ID) => CF=success
# For now, we only handle VESA modes (0x0200..0x03ff). To handle other
# modes, we should probably compile in the video code from the boot
# directory.
.code16
mode_set:
movw %ax, %bx
subb $VIDEO_FIRST_VESA>>8, %bh
cmpb $2, %bh
jb check_vesa
setbad:
clc
ret
check_vesa:
orw $0x4000, %bx # Use linear frame buffer
movw $0x4f02, %ax # VESA BIOS mode set call
int $0x10
cmpw $0x004f, %ax # AL=4f if implemented
jnz setbad # AH=0 if OK
stc
ret
wakeup_stack_begin: # Stack grows down
.org 0xff0
wakeup_stack: # Just below end of page
.org 0x1000
ENTRY(wakeup_level4_pgt)
.quad level3_ident_pgt - __START_KERNEL_map + _KERNPG_TABLE
.fill 510,8,0
/* (2^48-(2*1024*1024*1024))/(2^39) = 511 */
.quad level3_kernel_pgt - __START_KERNEL_map + _KERNPG_TABLE
ENTRY(wakeup_end)
##
# acpi_copy_wakeup_routine
#
# Copy the above routine to low memory.
#
# Parameters:
# %rdi: place to copy wakeup routine to
#
# Returned address is location of code in low memory (past data and stack)
#
.code64
ENTRY(acpi_copy_wakeup_routine)
pushq %rax
pushq %rdx
movl saved_video_mode, %edx
movl %edx, video_mode - wakeup_start (,%rdi)
movl acpi_realmode_flags, %edx
movl %edx, realmode_flags - wakeup_start (,%rdi)
movq $0x12345678, real_magic - wakeup_start (,%rdi)
movq $0x123456789abcdef0, %rdx
movq %rdx, saved_magic
movq saved_magic, %rax
movq $0x123456789abcdef0, %rdx
cmpq %rdx, %rax
jne bogus_64_magic
# restore the regs we used
popq %rdx
popq %rax
ENTRY(do_suspend_lowlevel_s4bios)
ret
.align 2
.p2align 4,,15
.globl do_suspend_lowlevel
@ -414,7 +119,7 @@ do_suspend_lowlevel:
jmp restore_processor_state
.LFE5:
.Lfe5:
.size do_suspend_lowlevel,.Lfe5-do_suspend_lowlevel
.size do_suspend_lowlevel, .Lfe5-do_suspend_lowlevel
.data
ALIGN

10
arch/x86/kernel/acpi/wakeup_rm.S Normal file
View File

@ -0,0 +1,10 @@
/*
* Wrapper script for the realmode binary as a transport object
* before copying to low memory.
*/
.section ".rodata","a"
.globl wakeup_code_start, wakeup_code_end
wakeup_code_start:
.incbin "arch/x86/kernel/acpi/realmode/wakeup.bin"
wakeup_code_end:
.size wakeup_code_start, .-wakeup_code_start

5
arch/x86/kernel/e820_64.c
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@ -27,6 +27,7 @@
#include <asm/setup.h>
#include <asm/sections.h>
#include <asm/kdebug.h>
#include <asm/trampoline.h>
struct e820map e820;
@ -58,8 +59,8 @@ struct early_res {
};
static struct early_res early_res[MAX_EARLY_RES] __initdata = {
{ 0, PAGE_SIZE, "BIOS data page" }, /* BIOS data page */
#ifdef CONFIG_SMP
{ SMP_TRAMPOLINE_BASE, SMP_TRAMPOLINE_BASE + 2*PAGE_SIZE, "SMP_TRAMPOLINE" },
#ifdef CONFIG_X86_TRAMPOLINE
{ TRAMPOLINE_BASE, TRAMPOLINE_BASE + 2 * PAGE_SIZE, "TRAMPOLINE" },
#endif
{}
};

4
arch/x86/kernel/head_64.S
View File

@ -132,10 +132,6 @@ ident_complete:
addq %rbp, trampoline_level4_pgt + 0(%rip)
addq %rbp, trampoline_level4_pgt + (511*8)(%rip)
#endif
#ifdef CONFIG_ACPI_SLEEP
addq %rbp, wakeup_level4_pgt + 0(%rip)
addq %rbp, wakeup_level4_pgt + (511*8)(%rip)
#endif
/* Due to ENTRY(), sometimes the empty space gets filled with
* zeros. Better take a jmp than relying on empty space being

4
arch/x86/kernel/setup_32.c
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@ -192,7 +192,7 @@ EXPORT_SYMBOL(ist_info);
extern void early_cpu_init(void);
extern int root_mountflags;
unsigned long saved_videomode;
unsigned long saved_video_mode;
#define RAMDISK_IMAGE_START_MASK 0x07FF
#define RAMDISK_PROMPT_FLAG 0x8000
@ -763,7 +763,7 @@ void __init setup_arch(char **cmdline_p)
edid_info = boot_params.edid_info;
apm_info.bios = boot_params.apm_bios_info;
ist_info = boot_params.ist_info;
saved_videomode = boot_params.hdr.vid_mode;
saved_video_mode = boot_params.hdr.vid_mode;
if( boot_params.sys_desc_table.length != 0 ) {
set_mca_bus(boot_params.sys_desc_table.table[3] & 0x2);
machine_id = boot_params.sys_desc_table.table[0];

1
arch/x86/kernel/setup_64.c
View File

@ -65,6 +65,7 @@
#include <asm/mce.h>
#include <asm/ds.h>
#include <asm/topology.h>
#include <asm/trampoline.h>
#include <mach_apic.h>
#ifdef CONFIG_PARAVIRT

6
arch/x86/kernel/smpboot.c
View File

@ -53,6 +53,7 @@
#include <asm/nmi.h>
#include <asm/irq.h>
#include <asm/smp.h>
#include <asm/trampoline.h>
#include <asm/cpu.h>
#include <asm/numa.h>
#include <asm/pgtable.h>
@ -140,7 +141,7 @@ static atomic_t init_deasserted;
static int boot_cpu_logical_apicid;
/* ready for x86_64, no harm for x86, since it will overwrite after alloc */
unsigned char *trampoline_base = __va(SMP_TRAMPOLINE_BASE);
unsigned char *trampoline_base = __va(TRAMPOLINE_BASE);
/* representing cpus for which sibling maps can be computed */
static cpumask_t cpu_sibling_setup_map;
@ -554,8 +555,7 @@ cpumask_t cpu_coregroup_map(int cpu)
* bootstrap into the page concerned. The caller
* has made sure it's suitably aligned.
*/
unsigned long __cpuinit setup_trampoline(void)
unsigned long setup_trampoline(void)
{
memcpy(trampoline_base, trampoline_data,
trampoline_end - trampoline_data);

5
arch/x86/kernel/trampoline_64.S
View File

@ -30,12 +30,7 @@
#include <asm/msr.h>
#include <asm/segment.h>
/* We can free up trampoline after bootup if cpu hotplug is not supported. */
#ifndef CONFIG_HOTPLUG_CPU
.section .cpuinit.data, "aw", @progbits
#else
.section .rodata, "a", @progbits
#endif
.code16

1
arch/x86/mach-voyager/voyager_smp.c
View File

@ -27,6 +27,7 @@
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
#include <asm/arch_hooks.h>
#include <asm/trampoline.h>
/* TLB state -- visible externally, indexed physically */
DEFINE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate) = { &init_mm, 0 };

13
include/asm-x86/smp.h
View File

@ -45,22 +45,12 @@ DECLARE_PER_CPU(u16, cpu_llc_id);
DECLARE_PER_CPU(u16, x86_cpu_to_apicid);
DECLARE_PER_CPU(u16, x86_bios_cpu_apicid);
/*
* Trampoline 80x86 program as an array.
*/
extern const unsigned char trampoline_data [];
extern const unsigned char trampoline_end [];
extern unsigned char *trampoline_base;
/* Static state in head.S used to set up a CPU */
extern struct {
void *sp;
unsigned short ss;
} stack_start;
extern unsigned long init_rsp;
extern unsigned long initial_code;
struct smp_ops {
void (*smp_prepare_boot_cpu)(void);
void (*smp_prepare_cpus)(unsigned max_cpus);
@ -130,9 +120,6 @@ extern void __cpu_die(unsigned int cpu);
extern void prefill_possible_map(void);
#define SMP_TRAMPOLINE_BASE 0x6000
extern unsigned long setup_trampoline(void);
void smp_store_cpu_info(int id);
#define cpu_physical_id(cpu) per_cpu(x86_cpu_to_apicid, cpu)

21
include/asm-x86/trampoline.h Normal file
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@ -0,0 +1,21 @@
#ifndef __TRAMPOLINE_HEADER
#define __TRAMPOLINE_HEADER
#ifndef __ASSEMBLY__
/*
* Trampoline 80x86 program as an array.
*/
extern const unsigned char trampoline_data [];
extern const unsigned char trampoline_end [];
extern unsigned char *trampoline_base;
extern unsigned long init_rsp;
extern unsigned long initial_code;
#define TRAMPOLINE_BASE 0x6000
extern unsigned long setup_trampoline(void);
#endif /* __ASSEMBLY__ */
#endif /* __TRAMPOLINE_HEADER */