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/* SPDX-License-Identifier: GPL-2.0-only */
.text
#include <linux/linkage.h>
#include <asm/segment.h>
#include <asm/page_types.h>
# Copyright 2003, 2008 Pavel Machek <pavel@suse.cz
.code32
ALIGN
SYM_CODE_START(wakeup_pmode_return)
movw $__KERNEL_DS, %ax
movw %ax, %ss
movw %ax, %fs
movw %ax, %gs
movw $__USER_DS, %ax
movw %ax, %ds
movw %ax, %es
# reload the gdt, as we need the full 32 bit address
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
SYM_CODE_END(wakeup_pmode_return)
bogus_magic:
jmp bogus_magic
save_registers:
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
SYM_CODE_START(do_suspend_lowlevel)
call save_processor_state
call save_registers
pushl $3
call x86_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
SYM_CODE_END(do_suspend_lowlevel)
.data
ALIGN
SYM_DATA(saved_magic, .long 0)
saved_eip: .long 0
# saved registers
saved_idt: .long 0,0
saved_ldt: .long 0
saved_tss: .long 0
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