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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/x86/kernel/acpi/wakeup_32.S
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/* SPDX-License-Identifier: GPL-2.0-only */

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	.text

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#include <linux/linkage.h>

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#include <asm/segment.h>

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#include <asm/page_types.h>

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# Copyright 2003, 2008 Pavel Machek <[email protected]

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	.code32

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	ALIGN

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SYM_CODE_START(wakeup_pmode_return)

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	movw	$__KERNEL_DS, %ax

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	movw	%ax, %ss

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	movw	%ax, %fs

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	movw	%ax, %gs

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	movw	$__USER_DS, %ax

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	movw	%ax, %ds

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	movw	%ax, %es

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	# reload the gdt, as we need the full 32 bit address

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	lidt	saved_idt

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	lldt	saved_ldt

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	ljmp	$(__KERNEL_CS), $1f

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1:

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	movl	%cr3, %eax

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	movl	%eax, %cr3

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	wbinvd

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	# and restore the stack ... but you need gdt for this to work

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	movl	saved_context_esp, %esp

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	movl	%cs:saved_magic, %eax

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	cmpl	$0x12345678, %eax

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	jne	bogus_magic

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	# jump to place where we left off

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	movl	saved_eip, %eax

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	jmp	*%eax

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SYM_CODE_END(wakeup_pmode_return)

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bogus_magic:

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	jmp	bogus_magic

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save_registers:

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	sidt	saved_idt

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	sldt	saved_ldt

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	str	saved_tss

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	leal	4(%esp), %eax

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	movl	%eax, saved_context_esp

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	movl	%ebx, saved_context_ebx

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	movl	%ebp, saved_context_ebp

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	movl	%esi, saved_context_esi

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	movl	%edi, saved_context_edi

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	pushfl

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	popl	saved_context_eflags

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	movl	$ret_point, saved_eip

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	RET

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restore_registers:

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	movl	saved_context_ebp, %ebp

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	movl	saved_context_ebx, %ebx

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	movl	saved_context_esi, %esi

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	movl	saved_context_edi, %edi

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	pushl	saved_context_eflags

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	popfl

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	RET

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SYM_CODE_START(do_suspend_lowlevel)

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	call	save_processor_state

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	call	save_registers

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	pushl	$3

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	call	x86_acpi_enter_sleep_state

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	addl	$4, %esp

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#	In case of S3 failure, we'll emerge here.  Jump

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# 	to ret_point to recover

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	jmp	ret_point

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	.p2align 4,,7

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ret_point:

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	call	restore_registers

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	call	restore_processor_state

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	RET

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SYM_CODE_END(do_suspend_lowlevel)

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.data

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ALIGN

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SYM_DATA(saved_magic,	.long 0)

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saved_eip:		.long 0

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# saved registers

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saved_idt:	.long	0,0

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saved_ldt:	.long	0

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saved_tss:	.long	0

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