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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [arch/] [x86/] [kernel/] [suspend_asm_64.S] - Blame information for rev 3

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1 3 xianfeng 
/* Copyright 2004,2005 Pavel Machek , Andi Kleen , Rafael J. Wysocki
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 *
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 * Distribute under GPLv2.
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 *
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 * swsusp_arch_resume must not use any stack or any nonlocal variables while
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 * 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
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#include
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#include
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#include
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ENTRY(swsusp_arch_suspend)
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        movq    $saved_context, %rax
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        movq    %rsp, pt_regs_rsp(%rax)
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        movq    %rbp, pt_regs_rbp(%rax)
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        movq    %rsi, pt_regs_rsi(%rax)
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        movq    %rdi, pt_regs_rdi(%rax)
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        movq    %rbx, pt_regs_rbx(%rax)
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        movq    %rcx, pt_regs_rcx(%rax)
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        movq    %rdx, pt_regs_rdx(%rax)
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        movq    %r8, pt_regs_r8(%rax)
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        movq    %r9, pt_regs_r9(%rax)
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        movq    %r10, pt_regs_r10(%rax)
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        movq    %r11, pt_regs_r11(%rax)
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        movq    %r12, pt_regs_r12(%rax)
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        movq    %r13, pt_regs_r13(%rax)
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        movq    %r14, pt_regs_r14(%rax)
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        movq    %r15, pt_regs_r15(%rax)
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        pushfq
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        popq    pt_regs_eflags(%rax)
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        /* save the address of restore_registers */
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        movq    $restore_registers, %rax
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        movq    %rax, restore_jump_address(%rip)
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        /* save cr3 */
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        movq    %cr3, %rax
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        movq    %rax, restore_cr3(%rip)
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        call swsusp_save
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        ret
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ENTRY(restore_image)
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        /* switch to temporary page tables */
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        movq    $__PAGE_OFFSET, %rdx
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        movq    temp_level4_pgt(%rip), %rax
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        subq    %rdx, %rax
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        movq    %rax, %cr3
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        /* Flush TLB */
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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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        /* prepare to jump to the image kernel */
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        movq    restore_jump_address(%rip), %rax
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        movq    restore_cr3(%rip), %rbx
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        /* prepare to copy image data to their original locations */
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        movq    restore_pblist(%rip), %rdx
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        movq    relocated_restore_code(%rip), %rcx
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        jmpq    *%rcx
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        /* code below has been relocated to a safe page */
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ENTRY(core_restore_code)
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loop:
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        testq   %rdx, %rdx
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        jz      done
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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    $(PAGE_SIZE >> 3), %rcx
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        rep
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        movsq
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        /* progress to the next pbe */
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        movq    pbe_next(%rdx), %rdx
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        jmp     loop
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done:
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        /* jump to the restore_registers address from the image header */
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        jmpq    *%rax
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        /*
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         * NOTE: This assumes that the boot kernel's text mapping covers the
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         * image kernel's page containing restore_registers and the address of
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         * this page is the same as in the image kernel's text mapping (it
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         * should always be true, because the text mapping is linear, starting
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         * from 0, and is supposed to cover the entire kernel text for every
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         * kernel).
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         *
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         * code below belongs to the image kernel
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         */
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ENTRY(restore_registers)
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        /* go back to the original page tables */
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        movq    %rbx, %cr3
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        /* Flush TLB, including "global" things (vmalloc) */
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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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        /* We don't restore %rax, it must be 0 anyway */
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        movq    $saved_context, %rax
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        movq    pt_regs_rsp(%rax), %rsp
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        movq    pt_regs_rbp(%rax), %rbp
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        movq    pt_regs_rsi(%rax), %rsi
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        movq    pt_regs_rdi(%rax), %rdi
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        movq    pt_regs_rbx(%rax), %rbx
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        movq    pt_regs_rcx(%rax), %rcx
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        movq    pt_regs_rdx(%rax), %rdx
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        movq    pt_regs_r8(%rax), %r8
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        movq    pt_regs_r9(%rax), %r9
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        movq    pt_regs_r10(%rax), %r10
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        movq    pt_regs_r11(%rax), %r11
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        movq    pt_regs_r12(%rax), %r12
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        movq    pt_regs_r13(%rax), %r13
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        movq    pt_regs_r14(%rax), %r14
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        movq    pt_regs_r15(%rax), %r15
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        pushq   pt_regs_eflags(%rax)
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        popfq
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        xorq    %rax, %rax
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        /* tell the hibernation core that we've just restored the memory */
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        movq    %rax, in_suspend(%rip)
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        ret

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