arch/x86/power/hibernate_asm_32.S

Source file repositories/reference/linux-study-clean/arch/x86/power/hibernate_asm_32.S

File Facts

System
Linux kernel
Corpus path
arch/x86/power/hibernate_asm_32.S
Extension
.S
Size
2411 bytes
Lines
112
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

#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>

.text

SYM_FUNC_START(swsusp_arch_suspend)
	movl %esp, saved_context_esp
	movl %ebx, saved_context_ebx
	movl %ebp, saved_context_ebp
	movl %esi, saved_context_esi
	movl %edi, saved_context_edi
	pushfl
	popl saved_context_eflags

	/* save cr3 */
	movl	%cr3, %eax
	movl	%eax, restore_cr3

	FRAME_BEGIN
	call swsusp_save
	FRAME_END
	RET
SYM_FUNC_END(swsusp_arch_suspend)

SYM_CODE_START(restore_image)
	/* prepare to jump to the image kernel */
	movl	restore_jump_address, %ebx
	movl	restore_cr3, %ebp

	movl	mmu_cr4_features, %ecx

	/* jump to relocated restore code */
	movl	relocated_restore_code, %eax
	jmpl	*%eax
SYM_CODE_END(restore_image)

/* code below has been relocated to a safe page */
SYM_CODE_START(core_restore_code)
	movl	temp_pgt, %eax
	movl	%eax, %cr3

	jecxz	1f	# cr4 Pentium and higher, skip if zero
	andl	$~(X86_CR4_PGE), %ecx
	movl	%ecx, %cr4;  # turn off PGE
	movl	%cr3, %eax;  # flush TLB
	movl	%eax, %cr3
1:
	movl	restore_pblist, %edx
	.p2align 4,,7

copy_loop:
	testl	%edx, %edx
	jz	done

	movl	pbe_address(%edx), %esi
	movl	pbe_orig_address(%edx), %edi

	movl	$(PAGE_SIZE >> 2), %ecx
	rep movsl

	movl	pbe_next(%edx), %edx
	jmp	copy_loop
	.p2align 4,,7

done:
	jmpl	*%ebx

Annotation

Implementation Notes