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Rafael J. Wysockicf7700f2008-02-09 23:24:09 +01001/*
2 * Hibernation support for x86-64
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * Distribute under GPLv2.
5 *
Rafael J. Wysockicf7700f2008-02-09 23:24:09 +01006 * Copyright 2007 Rafael J. Wysocki <rjw@sisk.pl>
7 * Copyright 2005 Andi Kleen <ak@suse.de>
8 * Copyright 2004 Pavel Machek <pavel@suse.cz>
9 *
Rafael J. Wysockid158cbd2007-10-18 03:04:53 -070010 * swsusp_arch_resume must not use any stack or any nonlocal variables while
11 * copying pages:
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 *
13 * Its rewriting one kernel image with another. What is stack in "old"
14 * image could very well be data page in "new" image, and overwriting
15 * your own stack under you is bad idea.
16 */
Rafael J. Wysockicf7700f2008-02-09 23:24:09 +010017
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 .text
19#include <linux/linkage.h>
20#include <asm/segment.h>
21#include <asm/page.h>
Sam Ravnborge2d5df92005-09-09 21:28:48 +020022#include <asm/asm-offsets.h>
Cyrill Gorcunovbbb1e572008-02-09 00:49:13 +030023#include <asm/processor-flags.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25ENTRY(swsusp_arch_suspend)
Rafael J. Wysocki0de80bc2007-10-23 22:37:24 +020026 movq $saved_context, %rax
H. Peter Anvin65ea5b02008-01-30 13:30:56 +010027 movq %rsp, pt_regs_sp(%rax)
28 movq %rbp, pt_regs_bp(%rax)
29 movq %rsi, pt_regs_si(%rax)
30 movq %rdi, pt_regs_di(%rax)
31 movq %rbx, pt_regs_bx(%rax)
32 movq %rcx, pt_regs_cx(%rax)
33 movq %rdx, pt_regs_dx(%rax)
Rafael J. Wysocki0de80bc2007-10-23 22:37:24 +020034 movq %r8, pt_regs_r8(%rax)
35 movq %r9, pt_regs_r9(%rax)
36 movq %r10, pt_regs_r10(%rax)
37 movq %r11, pt_regs_r11(%rax)
38 movq %r12, pt_regs_r12(%rax)
39 movq %r13, pt_regs_r13(%rax)
40 movq %r14, pt_regs_r14(%rax)
41 movq %r15, pt_regs_r15(%rax)
42 pushfq
H. Peter Anvin65ea5b02008-01-30 13:30:56 +010043 popq pt_regs_flags(%rax)
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
Rafael J. Wysockid158cbd2007-10-18 03:04:53 -070045 /* save the address of restore_registers */
46 movq $restore_registers, %rax
47 movq %rax, restore_jump_address(%rip)
Rafael J. Wysockic30bb682007-10-18 03:04:54 -070048 /* save cr3 */
49 movq %cr3, %rax
50 movq %rax, restore_cr3(%rip)
Rafael J. Wysockid158cbd2007-10-18 03:04:53 -070051
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 call swsusp_save
53 ret
54
Rafael J. Wysocki3dd08322005-10-09 21:19:40 +020055ENTRY(restore_image)
56 /* switch to temporary page tables */
57 movq $__PAGE_OFFSET, %rdx
58 movq temp_level4_pgt(%rip), %rax
59 subq %rdx, %rax
60 movq %rax, %cr3
61 /* Flush TLB */
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 movq mmu_cr4_features(%rip), %rax
63 movq %rax, %rdx
Cyrill Gorcunovbbb1e572008-02-09 00:49:13 +030064 andq $~(X86_CR4_PGE), %rdx
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 movq %rdx, %cr4; # turn off PGE
66 movq %cr3, %rcx; # flush TLB
67 movq %rcx, %cr3;
68 movq %rax, %cr4; # turn PGE back on
69
Rafael J. Wysockid158cbd2007-10-18 03:04:53 -070070 /* prepare to jump to the image kernel */
71 movq restore_jump_address(%rip), %rax
Rafael J. Wysockic30bb682007-10-18 03:04:54 -070072 movq restore_cr3(%rip), %rbx
Rafael J. Wysockid158cbd2007-10-18 03:04:53 -070073
74 /* prepare to copy image data to their original locations */
Rafael J. Wysocki75534b52006-09-25 23:32:52 -070075 movq restore_pblist(%rip), %rdx
Rafael J. Wysockid158cbd2007-10-18 03:04:53 -070076 movq relocated_restore_code(%rip), %rcx
77 jmpq *%rcx
78
79 /* code below has been relocated to a safe page */
80ENTRY(core_restore_code)
Linus Torvalds1da177e2005-04-16 15:20:36 -070081loop:
82 testq %rdx, %rdx
83 jz done
84
85 /* get addresses from the pbe and copy the page */
86 movq pbe_address(%rdx), %rsi
87 movq pbe_orig_address(%rdx), %rdi
Rafael J. Wysockid158cbd2007-10-18 03:04:53 -070088 movq $(PAGE_SIZE >> 3), %rcx
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 rep
90 movsq
91
92 /* progress to the next pbe */
93 movq pbe_next(%rdx), %rdx
94 jmp loop
95done:
Rafael J. Wysockid158cbd2007-10-18 03:04:53 -070096 /* jump to the restore_registers address from the image header */
97 jmpq *%rax
98 /*
99 * NOTE: This assumes that the boot kernel's text mapping covers the
100 * image kernel's page containing restore_registers and the address of
101 * this page is the same as in the image kernel's text mapping (it
102 * should always be true, because the text mapping is linear, starting
103 * from 0, and is supposed to cover the entire kernel text for every
104 * kernel).
105 *
106 * code below belongs to the image kernel
107 */
108
109ENTRY(restore_registers)
Rafael J. Wysocki3dd08322005-10-09 21:19:40 +0200110 /* go back to the original page tables */
Rafael J. Wysockic30bb682007-10-18 03:04:54 -0700111 movq %rbx, %cr3
Vivek Goyal1ab60e02007-05-02 19:27:07 +0200112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 /* Flush TLB, including "global" things (vmalloc) */
114 movq mmu_cr4_features(%rip), %rax
115 movq %rax, %rdx
Cyrill Gorcunovbbb1e572008-02-09 00:49:13 +0300116 andq $~(X86_CR4_PGE), %rdx
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 movq %rdx, %cr4; # turn off PGE
118 movq %cr3, %rcx; # flush TLB
119 movq %rcx, %cr3
120 movq %rax, %cr4; # turn PGE back on
121
Rafael J. Wysocki0de80bc2007-10-23 22:37:24 +0200122 /* We don't restore %rax, it must be 0 anyway */
123 movq $saved_context, %rax
H. Peter Anvin65ea5b02008-01-30 13:30:56 +0100124 movq pt_regs_sp(%rax), %rsp
125 movq pt_regs_bp(%rax), %rbp
126 movq pt_regs_si(%rax), %rsi
127 movq pt_regs_di(%rax), %rdi
128 movq pt_regs_bx(%rax), %rbx
129 movq pt_regs_cx(%rax), %rcx
130 movq pt_regs_dx(%rax), %rdx
Rafael J. Wysocki0de80bc2007-10-23 22:37:24 +0200131 movq pt_regs_r8(%rax), %r8
132 movq pt_regs_r9(%rax), %r9
133 movq pt_regs_r10(%rax), %r10
134 movq pt_regs_r11(%rax), %r11
135 movq pt_regs_r12(%rax), %r12
136 movq pt_regs_r13(%rax), %r13
137 movq pt_regs_r14(%rax), %r14
138 movq pt_regs_r15(%rax), %r15
H. Peter Anvin65ea5b02008-01-30 13:30:56 +0100139 pushq pt_regs_flags(%rax)
Rafael J. Wysocki0de80bc2007-10-23 22:37:24 +0200140 popfq
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
142 xorq %rax, %rax
143
Rafael J. Wysockid158cbd2007-10-18 03:04:53 -0700144 /* tell the hibernation core that we've just restored the memory */
145 movq %rax, in_suspend(%rip)
146
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 ret