diff options
Diffstat (limited to 'arch/x86/power/hibernate_asm_64.S')
| -rw-r--r-- | arch/x86/power/hibernate_asm_64.S | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/arch/x86/power/hibernate_asm_64.S b/arch/x86/power/hibernate_asm_64.S new file mode 100644 index 000000000..0a0539e1c --- /dev/null +++ b/arch/x86/power/hibernate_asm_64.S @@ -0,0 +1,150 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Hibernation support for x86-64 + * + * 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> +#include <asm/frame.h> +#include <asm/nospec-branch.h> + + /* code below belongs to the image kernel */ + .align PAGE_SIZE +SYM_FUNC_START(restore_registers) + /* go back to the original page tables */ + movq %r9, %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) + + xorl %eax, %eax + + /* tell the hibernation core that we've just restored the memory */ + movq %rax, in_suspend(%rip) + + RET +SYM_FUNC_END(restore_registers) + +SYM_FUNC_START(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 cr3 */ + movq %cr3, %rax + movq %rax, restore_cr3(%rip) + + FRAME_BEGIN + call swsusp_save + FRAME_END + RET +SYM_FUNC_END(swsusp_arch_suspend) + +SYM_FUNC_START(restore_image) + /* prepare to jump to the image kernel */ + movq restore_jump_address(%rip), %r8 + movq restore_cr3(%rip), %r9 + + /* prepare to switch to temporary page tables */ + movq temp_pgt(%rip), %rax + movq mmu_cr4_features(%rip), %rbx + + /* prepare to copy image data to their original locations */ + movq restore_pblist(%rip), %rdx + + /* jump to relocated restore code */ + movq relocated_restore_code(%rip), %rcx + ANNOTATE_RETPOLINE_SAFE + jmpq *%rcx +SYM_FUNC_END(restore_image) + + /* code below has been relocated to a safe page */ +SYM_FUNC_START(core_restore_code) + /* switch to temporary page tables */ + movq %rax, %cr3 + /* flush TLB */ + movq %rbx, %rcx + andq $~(X86_CR4_PGE), %rcx + movq %rcx, %cr4; # turn off PGE + movq %cr3, %rcx; # flush TLB + movq %rcx, %cr3; + movq %rbx, %cr4; # turn PGE back on +.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 */ + ANNOTATE_RETPOLINE_SAFE + jmpq *%r8 +SYM_FUNC_END(core_restore_code) |