summaryrefslogtreecommitdiff
path: root/arch/x86/kernel/acpi/wakeup_64.S
blob: 7f9ade13bbcfefde7d940840f6c104b207941e84 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
/* SPDX-License-Identifier: GPL-2.0-only */
.text
#include <linux/linkage.h>
#include <asm/segment.h>
#include <asm/pgtable_types.h>
#include <asm/page_types.h>
#include <asm/msr.h>
#include <asm/asm-offsets.h>
#include <asm/frame.h>

# Copyright 2003 Pavel Machek <pavel@suse.cz

.code64
	/*
	 * Hooray, we are in Long 64-bit mode (but still running in low memory)
	 */
ENTRY(wakeup_long64)
	movq	saved_magic, %rax
	movq	$0x123456789abcdef0, %rdx
	cmpq	%rdx, %rax
	je	2f

	/* stop here on a saved_magic mismatch */
	movq $0xbad6d61676963, %rcx
1:
	jmp 1b
2:
	movw	$__KERNEL_DS, %ax
	movw	%ax, %ss	
	movw	%ax, %ds
	movw	%ax, %es
	movw	%ax, %fs
	movw	%ax, %gs
	movq	saved_rsp, %rsp

	movq	saved_rbx, %rbx
	movq	saved_rdi, %rdi
	movq	saved_rsi, %rsi
	movq	saved_rbp, %rbp

	movq	saved_rip, %rax
	jmp	*%rax
ENDPROC(wakeup_long64)

ENTRY(do_suspend_lowlevel)
	FRAME_BEGIN
	subq	$8, %rsp
	xorl	%eax, %eax
	call	save_processor_state

	movq	$saved_context, %rax
	movq	%rsp, pt_regs_sp(%rax)
	movq	%rbp, pt_regs_bp(%rax)
	movq	%rsi, pt_regs_si(%rax)
	movq	%rdi, pt_regs_di(%rax)
	movq	%rbx, pt_regs_bx(%rax)
	movq	%rcx, pt_regs_cx(%rax)
	movq	%rdx, pt_regs_dx(%rax)
	movq	%r8, pt_regs_r8(%rax)
	movq	%r9, pt_regs_r9(%rax)
	movq	%r10, pt_regs_r10(%rax)
	movq	%r11, pt_regs_r11(%rax)
	movq	%r12, pt_regs_r12(%rax)
	movq	%r13, pt_regs_r13(%rax)
	movq	%r14, pt_regs_r14(%rax)
	movq	%r15, pt_regs_r15(%rax)
	pushfq
	popq	pt_regs_flags(%rax)

	movq	$.Lresume_point, saved_rip(%rip)

	movq	%rsp, saved_rsp
	movq	%rbp, saved_rbp
	movq	%rbx, saved_rbx
	movq	%rdi, saved_rdi
	movq	%rsi, saved_rsi

	addq	$8, %rsp
	movl	$3, %edi
	xorl	%eax, %eax
	call	x86_acpi_enter_sleep_state
	/* in case something went wrong, restore the machine status and go on */
	jmp	.Lresume_point

	.align 4
.Lresume_point:
	/* We don't restore %rax, it must be 0 anyway */
	movq	$saved_context, %rax
	movq	saved_context_cr4(%rax), %rbx
	movq	%rbx, %cr4
	movq	saved_context_cr3(%rax), %rbx
	movq	%rbx, %cr3
	movq	saved_context_cr2(%rax), %rbx
	movq	%rbx, %cr2
	movq	saved_context_cr0(%rax), %rbx
	movq	%rbx, %cr0
	pushq	pt_regs_flags(%rax)
	popfq
	movq	pt_regs_sp(%rax), %rsp
	movq	pt_regs_bp(%rax), %rbp
	movq	pt_regs_si(%rax), %rsi
	movq	pt_regs_di(%rax), %rdi
	movq	pt_regs_bx(%rax), %rbx
	movq	pt_regs_cx(%rax), %rcx
	movq	pt_regs_dx(%rax), %rdx
	movq	pt_regs_r8(%rax), %r8
	movq	pt_regs_r9(%rax), %r9
	movq	pt_regs_r10(%rax), %r10
	movq	pt_regs_r11(%rax), %r11
	movq	pt_regs_r12(%rax), %r12
	movq	pt_regs_r13(%rax), %r13
	movq	pt_regs_r14(%rax), %r14
	movq	pt_regs_r15(%rax), %r15

#ifdef CONFIG_KASAN
	/*
	 * The suspend path may have poisoned some areas deeper in the stack,
	 * which we now need to unpoison.
	 */
	movq	%rsp, %rdi
	call	kasan_unpoison_task_stack_below
#endif

	xorl	%eax, %eax
	addq	$8, %rsp
	FRAME_END
	jmp	restore_processor_state
ENDPROC(do_suspend_lowlevel)

.data
saved_rbp:		.quad	0
saved_rsi:		.quad	0
saved_rdi:		.quad	0
saved_rbx:		.quad	0

saved_rip:		.quad	0
saved_rsp:		.quad	0

ENTRY(saved_magic)	.quad	0