1/* Copyright 2004,2005 Pavel Machek <pavel@suse.cz>, Andi Kleen <ak@suse.de>, Rafael J. Wysocki <rjw@sisk.pl> 2 * 3 * Distribute under GPLv2. 4 * 5 * swsusp_arch_resume may not use any stack, nor any variable that is 6 * not "NoSave" during copying pages: 7 * 8 * Its rewriting one kernel image with another. What is stack in "old" 9 * image could very well be data page in "new" image, and overwriting 10 * your own stack under you is bad idea. 11 */ 12 13 .text 14#include <linux/linkage.h> 15#include <asm/segment.h> 16#include <asm/page.h> 17#include <asm/asm-offsets.h> 18 19ENTRY(swsusp_arch_suspend) 20 21 movq %rsp, saved_context_esp(%rip) 22 movq %rax, saved_context_eax(%rip) 23 movq %rbx, saved_context_ebx(%rip) 24 movq %rcx, saved_context_ecx(%rip) 25 movq %rdx, saved_context_edx(%rip) 26 movq %rbp, saved_context_ebp(%rip) 27 movq %rsi, saved_context_esi(%rip) 28 movq %rdi, saved_context_edi(%rip) 29 movq %r8, saved_context_r08(%rip) 30 movq %r9, saved_context_r09(%rip) 31 movq %r10, saved_context_r10(%rip) 32 movq %r11, saved_context_r11(%rip) 33 movq %r12, saved_context_r12(%rip) 34 movq %r13, saved_context_r13(%rip) 35 movq %r14, saved_context_r14(%rip) 36 movq %r15, saved_context_r15(%rip) 37 pushfq ; popq saved_context_eflags(%rip) 38 39 call swsusp_save 40 ret 41 42ENTRY(restore_image) 43 /* switch to temporary page tables */ 44 movq $__PAGE_OFFSET, %rdx 45 movq temp_level4_pgt(%rip), %rax 46 subq %rdx, %rax 47 movq %rax, %cr3 48 /* Flush TLB */ 49 movq mmu_cr4_features(%rip), %rax 50 movq %rax, %rdx 51 andq $~(1<<7), %rdx # PGE 52 movq %rdx, %cr4; # turn off PGE 53 movq %cr3, %rcx; # flush TLB 54 movq %rcx, %cr3; 55 movq %rax, %cr4; # turn PGE back on 56 57 movq restore_pblist(%rip), %rdx 58loop: 59 testq %rdx, %rdx 60 jz done 61 62 /* get addresses from the pbe and copy the page */ 63 movq pbe_address(%rdx), %rsi 64 movq pbe_orig_address(%rdx), %rdi 65 movq $512, %rcx 66 rep 67 movsq 68 69 /* progress to the next pbe */ 70 movq pbe_next(%rdx), %rdx 71 jmp loop 72done: 73 /* go back to the original page tables */ 74 movq $(init_level4_pgt - __START_KERNEL_map), %rax 75 addq phys_base(%rip), %rax 76 movq %rax, %cr3 77 78 /* Flush TLB, including "global" things (vmalloc) */ 79 movq mmu_cr4_features(%rip), %rax 80 movq %rax, %rdx 81 andq $~(1<<7), %rdx; # PGE 82 movq %rdx, %cr4; # turn off PGE 83 movq %cr3, %rcx; # flush TLB 84 movq %rcx, %cr3 85 movq %rax, %cr4; # turn PGE back on 86 87 movl $24, %eax 88 movl %eax, %ds 89 90 movq saved_context_esp(%rip), %rsp 91 movq saved_context_ebp(%rip), %rbp 92 /* Don't restore %rax, it must be 0 anyway */ 93 movq saved_context_ebx(%rip), %rbx 94 movq saved_context_ecx(%rip), %rcx 95 movq saved_context_edx(%rip), %rdx 96 movq saved_context_esi(%rip), %rsi 97 movq saved_context_edi(%rip), %rdi 98 movq saved_context_r08(%rip), %r8 99 movq saved_context_r09(%rip), %r9 100 movq saved_context_r10(%rip), %r10 101 movq saved_context_r11(%rip), %r11 102 movq saved_context_r12(%rip), %r12 103 movq saved_context_r13(%rip), %r13 104 movq saved_context_r14(%rip), %r14 105 movq saved_context_r15(%rip), %r15 106 pushq saved_context_eflags(%rip) ; popfq 107 108 xorq %rax, %rax 109 110 ret 111