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/*
* Hibernation support for x86-64
*
* Distribute under GPLv2.
*
* Copyright 2007 Rafael J. Wysocki <rjw@sisk.pl>
* Copyright 2005 Andi Kleen <ak@suse.de>
* Copyright 2004 Pavel Machek <pavel@suse.cz>
*
* swsusp_arch_resume must not use any stack or any nonlocal variables while
* 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_types.h>
#include <asm/asm-offsets.h>
#include <asm/processor-flags.h>
ENTRY(swsusp_arch_suspend)
movq $saved_context, %rax
movq %rsp, pt_regs_sp(%rax)
movq %rbp, pt_regs_bp(%rax)
movq %rsi, pt_regs_si(%rax)
movq %rdi, pt_regs_di(%rax)
movq %rbx, pt_regs_bx(%rax)
movq %rcx, pt_regs_cx(%rax)
movq %rdx, pt_regs_dx(%rax)
movq %r8, pt_regs_r8(%rax)
movq %r9, pt_regs_r9(%rax)
movq %r10, pt_regs_r10(%rax)
movq %r11, pt_regs_r11(%rax)
movq %r12, pt_regs_r12(%rax)
movq %r13, pt_regs_r13(%rax)
movq %r14, pt_regs_r14(%rax)
movq %r15, pt_regs_r15(%rax)
pushfq
popq pt_regs_flags(%rax)
/* save the address of restore_registers */
movq $restore_registers, %rax
movq %rax, restore_jump_address(%rip)
/* save cr3 */
movq %cr3, %rax
movq %rax, restore_cr3(%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 $~(X86_CR4_PGE), %rdx
movq %rdx, %cr4; # turn off PGE
movq %cr3, %rcx; # flush TLB
movq %rcx, %cr3;
movq %rax, %cr4; # turn PGE back on
/* prepare to jump to the image kernel */
movq restore_jump_address(%rip), %rax
movq restore_cr3(%rip), %rbx
/* prepare to copy image data to their original locations */
movq restore_pblist(%rip), %rdx
movq relocated_restore_code(%rip), %rcx
jmpq *%rcx
/* code below has been relocated to a safe page */
ENTRY(core_restore_code)
.Lloop:
testq %rdx, %rdx
jz .Ldone
/* get addresses from the pbe and copy the page */
movq pbe_address(%rdx), %rsi
movq pbe_orig_address(%rdx), %rdi
movq $(PAGE_SIZE >> 3), %rcx
rep
movsq
/* progress to the next pbe */
movq pbe_next(%rdx), %rdx
jmp .Lloop
.Ldone:
/* jump to the restore_registers address from the image header */
jmpq *%rax
/*
* NOTE: This assumes that the boot kernel's text mapping covers the
* image kernel's page containing restore_registers and the address of
* this page is the same as in the image kernel's text mapping (it
* should always be true, because the text mapping is linear, starting
* from 0, and is supposed to cover the entire kernel text for every
* kernel).
*
* code below belongs to the image kernel
*/
ENTRY(restore_registers)
/* go back to the original page tables */
movq %rbx, %cr3
/* Flush TLB, including "global" things (vmalloc) */
movq mmu_cr4_features(%rip), %rax
movq %rax, %rdx
andq $~(X86_CR4_PGE), %rdx
movq %rdx, %cr4; # turn off PGE
movq %cr3, %rcx; # flush TLB
movq %rcx, %cr3
movq %rax, %cr4; # turn PGE back on
/* We don't restore %rax, it must be 0 anyway */
movq $saved_context, %rax
movq pt_regs_sp(%rax), %rsp
movq pt_regs_bp(%rax), %rbp
movq pt_regs_si(%rax), %rsi
movq pt_regs_di(%rax), %rdi
movq pt_regs_bx(%rax), %rbx
movq pt_regs_cx(%rax), %rcx
movq pt_regs_dx(%rax), %rdx
movq pt_regs_r8(%rax), %r8
movq pt_regs_r9(%rax), %r9
movq pt_regs_r10(%rax), %r10
movq pt_regs_r11(%rax), %r11
movq pt_regs_r12(%rax), %r12
movq pt_regs_r13(%rax), %r13
movq pt_regs_r14(%rax), %r14
movq pt_regs_r15(%rax), %r15
pushq pt_regs_flags(%rax)
popfq
/* Saved in save_processor_state. */
lgdt saved_context_gdt_desc(%rax)
xorq %rax, %rax
/* tell the hibernation core that we've just restored the memory */
movq %rax, in_suspend(%rip)
ret
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