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- /* 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/offset.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(swsusp_arch_resume)
- /* set up cr3 */
- leaq init_level4_pgt(%rip),%rax
- subq $__START_KERNEL_map,%rax
- movq %rax,%cr3
- 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 pagedir_nosave(%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:
- /* 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
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