suspend_asm.s

来自「优龙2410linux2.6.8内核源代码」· S 代码 · 共 126 行

/* originally gcc generated, but now changed. don't overwrite. */
	
	.text
#include <linux/linkage.h>
#include <asm/segment.h>
#include <asm/page.h>

/* Input:
 * rdi	resume flag 
 */	
			
ENTRY(do_magic)
.LFB5:
	subq	$8, %rsp
.LCFI2:
	testl	%edi, %edi
	jne	.L90
	call	do_magic_suspend_1
	call	save_processor_state

	movq %rsp, saved_context_esp(%rip)
	movq %rax, saved_context_eax(%rip)
	movq %rbx, saved_context_ebx(%rip)
	movq %rcx, saved_context_ecx(%rip)
	movq %rdx, saved_context_edx(%rip)
	movq %rbp, saved_context_ebp(%rip)
	movq %rsi, saved_context_esi(%rip)
	movq %rdi, saved_context_edi(%rip)
	movq %r8,  saved_context_r08(%rip)
	movq %r9,  saved_context_r09(%rip)
	movq %r10, saved_context_r10(%rip)
	movq %r11, saved_context_r11(%rip)
	movq %r12, saved_context_r12(%rip)
	movq %r13, saved_context_r13(%rip)
	movq %r14, saved_context_r14(%rip)
	movq %r15, saved_context_r15(%rip)
	pushfq ; popq saved_context_eflags(%rip)

	addq	$8, %rsp
	jmp	do_magic_suspend_2
.L90:
	/* set up cr3 */	
	leaq	init_level4_pgt(%rip),%rax
	subq	$__START_KERNEL_map,%rax
	movq %rax,%cr3

	movq	mmu_cr4_features(%rip), %rax
	movq	%rax, %rdx
	
	andq	$~(1<<7), %rdx	# PGE
	movq %rdx, %cr4;  # turn off PGE     
	movq %cr3, %rcx;  # flush TLB        
	movq %rcx, %cr3;                     
	movq %rax, %cr4;  # turn PGE back on 

	call	do_magic_resume_1
	movl	nr_copy_pages(%rip), %eax
	xorl	%ecx, %ecx
	movq	$0, loop(%rip)
	testl	%eax, %eax
	je	.L108
.L105:
	xorl	%esi, %esi
	movq	$0, loop2(%rip)
	jmp	.L104
	.p2align 4,,7
.L111:
	movq	loop(%rip), %rcx
.L104:
	movq	pagedir_nosave(%rip), %rdx
	movq	%rcx, %rax
	salq	$5, %rax
	movq	8(%rdx,%rax), %rcx
	movq	(%rdx,%rax), %rax
	movzbl	(%rsi,%rax), %eax
	movb	%al, (%rsi,%rcx)

	movq %cr3, %rax;  # flush TLB 
	movq %rax, %cr3;              

	movq	loop2(%rip), %rax
	incq	%rax
	cmpq	$4095, %rax
	movq	%rax, %rsi
	movq	%rax, loop2(%rip)
	jbe	.L111
	movq	loop(%rip), %rax
	incq	%rax
	movq	%rax, %rcx
	movq	%rax, loop(%rip)
	mov	nr_copy_pages(%rip), %eax
	cmpq	%rax, %rcx
	jb	.L105
.L108:
	.align 4
	movl	$24, %eax

	movl %eax, %ds
	movq saved_context_esp(%rip), %rsp
	movq saved_context_ebp(%rip), %rbp
	movq saved_context_eax(%rip), %rax
	movq saved_context_ebx(%rip), %rbx
	movq saved_context_ecx(%rip), %rcx
	movq saved_context_edx(%rip), %rdx
	movq saved_context_esi(%rip), %rsi
	movq saved_context_edi(%rip), %rdi
	movq saved_context_r08(%rip), %r8
	movq saved_context_r09(%rip), %r9
	movq saved_context_r10(%rip), %r10
	movq saved_context_r11(%rip), %r11
	movq saved_context_r12(%rip), %r12
	movq saved_context_r13(%rip), %r13
	movq saved_context_r14(%rip), %r14
	movq saved_context_r15(%rip), %r15
	pushq saved_context_eflags(%rip) ; popfq
	call	restore_processor_state
	addq	$8, %rsp
	jmp	do_magic_resume_2

	.section .data.nosave
loop:
	.quad 0
loop2:	
	.quad 0		
	.previous