diff options
Diffstat (limited to 'arch/x86/kernel/suspend_asm_64.S')
| -rw-r--r-- | arch/x86/kernel/suspend_asm_64.S | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/arch/x86/kernel/suspend_asm_64.S b/arch/x86/kernel/suspend_asm_64.S new file mode 100644 index 000000000000..16d183f67bc1 --- /dev/null +++ b/arch/x86/kernel/suspend_asm_64.S @@ -0,0 +1,110 @@ +/* Copyright 2004,2005 Pavel Machek <pavel@suse.cz>, Andi Kleen <ak@suse.de>, Rafael J. Wysocki <rjw@sisk.pl> + * + * Distribute under GPLv2. + * + * swsusp_arch_resume may not use any stack, nor any variable that is + * not "NoSave" during 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.h> +#include <asm/asm-offsets.h> + +ENTRY(swsusp_arch_suspend) + + movq %rsp, saved_context_esp(%rip) + movq %rax, saved_context_eax(%rip) + movq %rbx, saved_context_ebx(%rip) + movq %rcx, saved_context_ecx(%rip) + movq %rdx, saved_context_edx(%rip) + movq %rbp, saved_context_ebp(%rip) + movq %rsi, saved_context_esi(%rip) + movq %rdi, saved_context_edi(%rip) + movq %r8, saved_context_r08(%rip) + movq %r9, saved_context_r09(%rip) + movq %r10, saved_context_r10(%rip) + movq %r11, saved_context_r11(%rip) + movq %r12, saved_context_r12(%rip) + movq %r13, saved_context_r13(%rip) + movq %r14, saved_context_r14(%rip) + movq %r15, saved_context_r15(%rip) + pushfq ; popq saved_context_eflags(%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 $~(1<<7), %rdx # PGE + movq %rdx, %cr4; # turn off PGE + movq %cr3, %rcx; # flush TLB + movq %rcx, %cr3; + movq %rax, %cr4; # turn PGE back on + + movq restore_pblist(%rip), %rdx +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 $512, %rcx + rep + movsq + + /* progress to the next pbe */ + movq pbe_next(%rdx), %rdx + jmp loop +done: + /* go back to the original page tables */ + movq $(init_level4_pgt - __START_KERNEL_map), %rax + addq phys_base(%rip), %rax + movq %rax, %cr3 + + /* Flush TLB, including "global" things (vmalloc) */ + movq mmu_cr4_features(%rip), %rax + movq %rax, %rdx + andq $~(1<<7), %rdx; # PGE + movq %rdx, %cr4; # turn off PGE + movq %cr3, %rcx; # flush TLB + movq %rcx, %cr3 + movq %rax, %cr4; # turn PGE back on + + movl $24, %eax + movl %eax, %ds + + movq saved_context_esp(%rip), %rsp + movq saved_context_ebp(%rip), %rbp + /* Don't restore %rax, it must be 0 anyway */ + movq saved_context_ebx(%rip), %rbx + movq saved_context_ecx(%rip), %rcx + movq saved_context_edx(%rip), %rdx + movq saved_context_esi(%rip), %rsi + movq saved_context_edi(%rip), %rdi + movq saved_context_r08(%rip), %r8 + movq saved_context_r09(%rip), %r9 + movq saved_context_r10(%rip), %r10 + movq saved_context_r11(%rip), %r11 + movq saved_context_r12(%rip), %r12 + movq saved_context_r13(%rip), %r13 + movq saved_context_r14(%rip), %r14 + movq saved_context_r15(%rip), %r15 + pushq saved_context_eflags(%rip) ; popfq + + xorq %rax, %rax + + ret |