arch/x86/power/hibernate_asm_64.S

Source file repositories/reference/linux-study-clean/arch/x86/power/hibernate_asm_64.S

File Facts

System
Linux kernel
Corpus path
arch/x86/power/hibernate_asm_64.S
Extension
.S
Size
3841 bytes
Lines
152
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: arch/x86
Status
atlas-only

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

.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)
	ENDBR
	/* 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)

Annotation

Implementation Notes