projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| cf7700fe RW |
1 | /* |
| 2 | * Hibernation support for x86-64 | |
| 1da177e4 LT |
3 | * |
| 4 | * Distribute under GPLv2. | |
| 5 | * | |
| cf7700fe RW |
6 | * 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 | * | |
| d158cbdf RW |
10 | * swsusp_arch_resume must not use any stack or any nonlocal variables while |
| 11 | * copying pages: | |
| 1da177e4 LT |
12 | * |
| 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 | */ | |
| cf7700fe | 17 | |
| 1da177e4 LT |
18 | .text |
| 19 | #include <linux/linkage.h> | |
| 20 | #include <asm/segment.h> | |
| 21 | #include <asm/page.h> | |
| e2d5df93 | 22 | #include <asm/asm-offsets.h> |
| bbb1e57a | 23 | #include <asm/processor-flags.h> |
| 1da177e4 LT |
24 | |
| 25 | ENTRY(swsusp_arch_suspend) | |
| 0de80bcc | 26 | movq $saved_context, %rax |
| 65ea5b03 PA |
27 | 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) | |
| 0de80bcc RW |
34 | 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 | |
| 65ea5b03 | 43 | popq pt_regs_flags(%rax) |
| 1da177e4 | 44 | |
| d158cbdf RW |
45 | /* save the address of restore_registers */ |
| 46 | movq $restore_registers, %rax | |
| 47 | movq %rax, restore_jump_address(%rip) | |
| c30bb68c RW |
48 | /* save cr3 */ |
| 49 | movq %cr3, %rax | |
| 50 | movq %rax, restore_cr3(%rip) | |
| d158cbdf | 51 | |
| 1da177e4 LT |
52 | call swsusp_save |
| 53 | ret | |
| 54 | ||
| 3dd08325 RW |
55 | ENTRY(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 */ | |
| 1da177e4 LT |
62 | movq mmu_cr4_features(%rip), %rax |
| 63 | movq %rax, %rdx | |
| bbb1e57a | 64 | andq $~(X86_CR4_PGE), %rdx |
| 1da177e4 LT |
65 | 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 | ||
| d158cbdf RW |
70 | /* prepare to jump to the image kernel */ |
| 71 | movq restore_jump_address(%rip), %rax | |
| c30bb68c | 72 | movq restore_cr3(%rip), %rbx |
| d158cbdf RW |
73 | |
| 74 | /* prepare to copy image data to their original locations */ | |
| 75534b50 | 75 | movq restore_pblist(%rip), %rdx |
| d158cbdf RW |
76 | movq relocated_restore_code(%rip), %rcx |
| 77 | jmpq *%rcx | |
| 78 | ||
| 79 | /* code below has been relocated to a safe page */ | |
| 80 | ENTRY(core_restore_code) | |
| 1da177e4 LT |
81 | loop: |
| 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 | |
| d158cbdf | 88 | movq $(PAGE_SIZE >> 3), %rcx |
| 1da177e4 LT |
89 | rep |
| 90 | movsq | |
| 91 | ||
| 92 | /* progress to the next pbe */ | |
| 93 | movq pbe_next(%rdx), %rdx | |
| 94 | jmp loop | |
| 95 | done: | |
| d158cbdf RW |
96 | /* 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 | ||
| 109 | ENTRY(restore_registers) | |
| 3dd08325 | 110 | /* go back to the original page tables */ |
| c30bb68c | 111 | movq %rbx, %cr3 |
| 1ab60e0f | 112 | |
| 1da177e4 LT |
113 | /* Flush TLB, including "global" things (vmalloc) */ |
| 114 | movq mmu_cr4_features(%rip), %rax | |
| 115 | movq %rax, %rdx | |
| bbb1e57a | 116 | andq $~(X86_CR4_PGE), %rdx |
| 1da177e4 LT |
117 | 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 | ||
| 0de80bcc RW |
122 | /* We don't restore %rax, it must be 0 anyway */ |
| 123 | movq $saved_context, %rax | |
| 65ea5b03 PA |
124 | 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 | |
| 0de80bcc RW |
131 | 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 | |
| 65ea5b03 | 139 | pushq pt_regs_flags(%rax) |
| 0de80bcc | 140 | popfq |
| 1da177e4 LT |
141 | |
| 142 | xorq %rax, %rax | |
| 143 | ||
| d158cbdf RW |
144 | /* tell the hibernation core that we've just restored the memory */ |
| 145 | movq %rax, in_suspend(%rip) | |
| 146 | ||
| 1da177e4 | 147 | ret |