summaryrefslogtreecommitdiffstats
path: root/arch/x86/power/hibernate_asm_64.S
blob: 9356547d8c012458971b527897946d2c6d4aafae (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
140
141
142
143
144
145
146
147
/*
 * Hibernation support for x86-64
 *
 * Distribute under GPLv2.
 *
 * Copyright 2007 Rafael J. Wysocki <rjw@sisk.pl>
 * Copyright 2005 Andi Kleen <ak@suse.de>
 * Copyright 2004 Pavel Machek <pavel@suse.cz>
 *
 * swsusp_arch_resume must not use any stack or any nonlocal variables while
 * copying pages:
 *
 * Its rewriting one kernel image with another. What is stack in "old"
 * image could very well be data page in "new" image, and overwriting
 * your own stack under you is bad idea.
 */

	.text
#include <linux/linkage.h>
#include <asm/segment.h>
#include <asm/page_types.h>
#include <asm/asm-offsets.h>
#include <asm/processor-flags.h>

ENTRY(swsusp_arch_suspend)
	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)

	/* save the address of restore_registers */
	movq	$restore_registers, %rax
	movq	%rax, restore_jump_address(%rip)
	/* save cr3 */
	movq	%cr3, %rax
	movq	%rax, restore_cr3(%rip)

	call swsusp_save
	ret

ENTRY(restore_image)
	/* switch to temporary page tables */
	movq	$__PAGE_OFFSET, %rdx
	movq	temp_level4_pgt(%rip), %rax
	subq	%rdx, %rax
	movq	%rax, %cr3
	/* Flush TLB */
	movq	mmu_cr4_features(%rip), %rax
	movq	%rax, %rdx
	andq	$~(X86_CR4_PGE), %rdx
	movq	%rdx, %cr4;  # turn off PGE
	movq	%cr3, %rcx;  # flush TLB
	movq	%rcx, %cr3;
	movq	%rax, %cr4;  # turn PGE back on

	/* prepare to jump to the image kernel */
	movq	restore_jump_address(%rip), %rax
	movq	restore_cr3(%rip), %rbx

	/* prepare to copy image data to their original locations */
	movq	restore_pblist(%rip), %rdx
	movq	relocated_restore_code(%rip), %rcx
	jmpq	*%rcx

	/* code below has been relocated to a safe page */
ENTRY(core_restore_code)
loop:
	testq	%rdx, %rdx
	jz	done

	/* get addresses from the pbe and copy the page */
	movq	pbe_address(%rdx), %rsi
	movq	pbe_orig_address(%rdx), %rdi
	movq	$(PAGE_SIZE >> 3), %rcx
	rep
	movsq

	/* progress to the next pbe */
	movq	pbe_next(%rdx), %rdx
	jmp	loop
done:
	/* jump to the restore_registers address from the image header */
	jmpq	*%rax
	/*
	 * NOTE: This assumes that the boot kernel's text mapping covers the
	 * image kernel's page containing restore_registers and the address of
	 * this page is the same as in the image kernel's text mapping (it
	 * should always be true, because the text mapping is linear, starting
	 * from 0, and is supposed to cover the entire kernel text for every
	 * kernel).
	 *
	 * code below belongs to the image kernel
	 */

ENTRY(restore_registers)
	/* go back to the original page tables */
	movq    %rbx, %cr3

	/* Flush TLB, including "global" things (vmalloc) */
	movq	mmu_cr4_features(%rip), %rax
	movq	%rax, %rdx
	andq	$~(X86_CR4_PGE), %rdx
	movq	%rdx, %cr4;  # turn off PGE
	movq	%cr3, %rcx;  # flush TLB
	movq	%rcx, %cr3
	movq	%rax, %cr4;  # turn PGE back on

	/* We don't restore %rax, it must be 0 anyway */
	movq	$saved_context, %rax
	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
	pushq	pt_regs_flags(%rax)
	popfq

	xorq	%rax, %rax

	/* tell the hibernation core that we've just restored the memory */
	movq	%rax, in_suspend(%rip)

	ret