mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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100 lines
2.6 KiB
ArmAsm
100 lines
2.6 KiB
ArmAsm
/* Copyright 2004,2005 Pavel Machek <pavel@suse.cz>, Andi Kleen <ak@suse.de>, Rafael J. Wysocki <rjw@sisk.pl>
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*
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* Distribute under GPLv2.
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*
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* swsusp_arch_resume may not use any stack, nor any variable that is
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* not "NoSave" during copying pages:
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*
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* Its rewriting one kernel image with another. What is stack in "old"
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* image could very well be data page in "new" image, and overwriting
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* your own stack under you is bad idea.
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*/
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.text
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#include <linux/linkage.h>
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#include <asm/segment.h>
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#include <asm/page.h>
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#include <asm/offset.h>
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ENTRY(swsusp_arch_suspend)
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movq %rsp, saved_context_esp(%rip)
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movq %rax, saved_context_eax(%rip)
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movq %rbx, saved_context_ebx(%rip)
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movq %rcx, saved_context_ecx(%rip)
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movq %rdx, saved_context_edx(%rip)
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movq %rbp, saved_context_ebp(%rip)
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movq %rsi, saved_context_esi(%rip)
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movq %rdi, saved_context_edi(%rip)
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movq %r8, saved_context_r08(%rip)
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movq %r9, saved_context_r09(%rip)
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movq %r10, saved_context_r10(%rip)
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movq %r11, saved_context_r11(%rip)
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movq %r12, saved_context_r12(%rip)
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movq %r13, saved_context_r13(%rip)
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movq %r14, saved_context_r14(%rip)
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movq %r15, saved_context_r15(%rip)
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pushfq ; popq saved_context_eflags(%rip)
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call swsusp_save
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ret
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ENTRY(swsusp_arch_resume)
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/* set up cr3 */
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leaq init_level4_pgt(%rip),%rax
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subq $__START_KERNEL_map,%rax
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movq %rax,%cr3
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movq mmu_cr4_features(%rip), %rax
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movq %rax, %rdx
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andq $~(1<<7), %rdx # PGE
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movq %rdx, %cr4; # turn off PGE
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movq %cr3, %rcx; # flush TLB
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movq %rcx, %cr3;
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movq %rax, %cr4; # turn PGE back on
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movq pagedir_nosave(%rip), %rdx
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/* compute the limit */
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movl nr_copy_pages(%rip), %eax
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testl %eax, %eax
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jz done
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movq %rdx,%r8
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movl $SIZEOF_PBE,%r9d
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mul %r9 # with rax, clobbers rdx
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movq %r8, %rdx
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addq %r8, %rax
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loop:
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/* get addresses from the pbe and copy the page */
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movq pbe_address(%rdx), %rsi
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movq pbe_orig_address(%rdx), %rdi
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movq $512, %rcx
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rep
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movsq
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/* progress to the next pbe */
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addq $SIZEOF_PBE, %rdx
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cmpq %rax, %rdx
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jb loop
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done:
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movl $24, %eax
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movl %eax, %ds
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movq saved_context_esp(%rip), %rsp
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movq saved_context_ebp(%rip), %rbp
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movq saved_context_eax(%rip), %rax
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movq saved_context_ebx(%rip), %rbx
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movq saved_context_ecx(%rip), %rcx
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movq saved_context_edx(%rip), %rdx
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movq saved_context_esi(%rip), %rsi
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movq saved_context_edi(%rip), %rdi
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movq saved_context_r08(%rip), %r8
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movq saved_context_r09(%rip), %r9
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movq saved_context_r10(%rip), %r10
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movq saved_context_r11(%rip), %r11
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movq saved_context_r12(%rip), %r12
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movq saved_context_r13(%rip), %r13
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movq saved_context_r14(%rip), %r14
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movq saved_context_r15(%rip), %r15
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pushq saved_context_eflags(%rip) ; popfq
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call swsusp_restore
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ret
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