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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/x86/kernel/acpi/wakeup_64.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 <linux/objtool.h>

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#include <asm/segment.h>

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#include <asm/pgtable_types.h>

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#include <asm/page_types.h>

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#include <asm/msr.h>

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#include <asm/asm-offsets.h>

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#include <asm/frame.h>

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#include <asm/nospec-branch.h>

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# Copyright 2003 Pavel Machek <[email protected]

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.code64

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	/*

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	 * Hooray, we are in Long 64-bit mode (but still running in low memory)

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	 */

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SYM_FUNC_START(wakeup_long64)

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	ANNOTATE_NOENDBR

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	movq	saved_magic(%rip), %rax

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	movq	$0x123456789abcdef0, %rdx

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	cmpq	%rdx, %rax

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	je	2f

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	/* stop here on a saved_magic mismatch */

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	movq $0xbad6d61676963, %rcx

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1:

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	jmp 1b

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2:

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	movw	$__KERNEL_DS, %ax

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	movw	%ax, %ss	

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	movw	%ax, %ds

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	movw	%ax, %es

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	movw	%ax, %fs

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	movw	%ax, %gs

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	movq	saved_rsp(%rip), %rsp

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	movq	saved_rbx(%rip), %rbx

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	movq	saved_rdi(%rip), %rdi

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	movq	saved_rsi(%rip), %rsi

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	movq	saved_rbp(%rip), %rbp

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	movq	saved_rip(%rip), %rax

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	ANNOTATE_RETPOLINE_SAFE

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	jmp	*%rax

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SYM_FUNC_END(wakeup_long64)

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SYM_FUNC_START(do_suspend_lowlevel)

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	FRAME_BEGIN

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	subq	$8, %rsp

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	xorl	%eax, %eax

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	call	save_processor_state

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	movq	$saved_context, %rax

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	movq	%rsp, pt_regs_sp(%rax)

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	movq	%rbp, pt_regs_bp(%rax)

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	movq	%rsi, pt_regs_si(%rax)

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	movq	%rdi, pt_regs_di(%rax)

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	movq	%rbx, pt_regs_bx(%rax)

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	movq	%rcx, pt_regs_cx(%rax)

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	movq	%rdx, pt_regs_dx(%rax)

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	movq	%r8, pt_regs_r8(%rax)

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	movq	%r9, pt_regs_r9(%rax)

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	movq	%r10, pt_regs_r10(%rax)

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	movq	%r11, pt_regs_r11(%rax)

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	movq	%r12, pt_regs_r12(%rax)

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	movq	%r13, pt_regs_r13(%rax)

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	movq	%r14, pt_regs_r14(%rax)

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	movq	%r15, pt_regs_r15(%rax)

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	pushfq

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	popq	pt_regs_flags(%rax)

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	movq	$.Lresume_point, saved_rip(%rip)

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	movq	%rsp, saved_rsp(%rip)

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	movq	%rbp, saved_rbp(%rip)

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	movq	%rbx, saved_rbx(%rip)

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	movq	%rdi, saved_rdi(%rip)

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	movq	%rsi, saved_rsi(%rip)

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	addq	$8, %rsp

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	movl	$3, %edi

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	xorl	%eax, %eax

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	call	x86_acpi_enter_sleep_state

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	/* in case something went wrong, restore the machine status and go on */

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	jmp	.Lresume_point

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	.align 4

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.Lresume_point:

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	ANNOTATE_NOENDBR

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	/* We don't restore %rax, it must be 0 anyway */

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	movq	$saved_context, %rax

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	movq	saved_context_cr4(%rax), %rbx

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	movq	%rbx, %cr4

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	movq	saved_context_cr3(%rax), %rbx

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	movq	%rbx, %cr3

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	movq	saved_context_cr2(%rax), %rbx

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	movq	%rbx, %cr2

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	movq	saved_context_cr0(%rax), %rbx

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	movq	%rbx, %cr0

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	pushq	pt_regs_flags(%rax)

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	popfq

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	movq	pt_regs_sp(%rax), %rsp

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	movq	pt_regs_bp(%rax), %rbp

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	movq	pt_regs_si(%rax), %rsi

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	movq	pt_regs_di(%rax), %rdi

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	movq	pt_regs_bx(%rax), %rbx

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	movq	pt_regs_cx(%rax), %rcx

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	movq	pt_regs_dx(%rax), %rdx

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	movq	pt_regs_r8(%rax), %r8

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	movq	pt_regs_r9(%rax), %r9

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	movq	pt_regs_r10(%rax), %r10

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	movq	pt_regs_r11(%rax), %r11

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	movq	pt_regs_r12(%rax), %r12

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	movq	pt_regs_r13(%rax), %r13

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	movq	pt_regs_r14(%rax), %r14

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	movq	pt_regs_r15(%rax), %r15

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#if defined(CONFIG_KASAN) && defined(CONFIG_KASAN_STACK)

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	/*

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	 * The suspend path may have poisoned some areas deeper in the stack,

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	 * which we now need to unpoison.

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	 */

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	movq	%rsp, %rdi

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	call	kasan_unpoison_task_stack_below

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#endif

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	xorl	%eax, %eax

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	addq	$8, %rsp

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	FRAME_END

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	jmp	restore_processor_state

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SYM_FUNC_END(do_suspend_lowlevel)

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STACK_FRAME_NON_STANDARD do_suspend_lowlevel

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.data

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saved_rbp:		.quad	0

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saved_rsi:		.quad	0

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saved_rdi:		.quad	0

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saved_rbx:		.quad	0

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saved_rip:		.quad	0

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saved_rsp:		.quad	0

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SYM_DATA(saved_magic,	.quad	0)

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