linux/arch/x86/kernel/acpi/wakeup_32.S
Pavel Machek e44b7b7525 x86: move suspend wakeup code to C
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>
2008-04-17 17:41:37 +02:00

100 lines
1.7 KiB
ArmAsm

.section .text.page_aligned
#include <linux/linkage.h>
#include <asm/segment.h>
#include <asm/page.h>
# Copyright 2003, 2008 Pavel Machek <pavel@suse.cz>, distribute under GPLv2
.code32
ALIGN
ENTRY(wakeup_pmode_return)
wakeup_pmode_return:
movw $__KERNEL_DS, %ax
movw %ax, %ss
movw %ax, %ds
movw %ax, %es
movw %ax, %fs
movw %ax, %gs
# reload the gdt, as we need the full 32 bit address
lgdt saved_gdt
lidt saved_idt
lldt saved_ldt
ljmp $(__KERNEL_CS), $1f
1:
movl %cr3, %eax
movl %eax, %cr3
wbinvd
# and restore the stack ... but you need gdt for this to work
movl saved_context_esp, %esp
movl %cs:saved_magic, %eax
cmpl $0x12345678, %eax
jne bogus_magic
# jump to place where we left off
movl saved_eip, %eax
jmp *%eax
bogus_magic:
jmp bogus_magic
save_registers:
sgdt saved_gdt
sidt saved_idt
sldt saved_ldt
str saved_tss
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
movl $ret_point, saved_eip
ret
restore_registers:
movl saved_context_ebp, %ebp
movl saved_context_ebx, %ebx
movl saved_context_esi, %esi
movl saved_context_edi, %edi
pushl saved_context_eflags
popfl
ret
ENTRY(do_suspend_lowlevel)
call save_processor_state
call save_registers
pushl $3
call acpi_enter_sleep_state
addl $4, %esp
# In case of S3 failure, we'll emerge here. Jump
# to ret_point to recover
jmp ret_point
.p2align 4,,7
ret_point:
call restore_registers
call restore_processor_state
ret
.data
ALIGN
ENTRY(saved_magic) .long 0
ENTRY(saved_eip) .long 0
# saved registers
saved_gdt: .long 0,0
saved_idt: .long 0,0
saved_ldt: .long 0
saved_tss: .long 0