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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/x86/power/hibernate_asm_32.S
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/*

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 * This may not use any stack, nor any variable that is not "NoSave":

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 *

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 * Its rewriting one kernel image with another. What is stack in "old"

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 * image could very well be data page in "new" image, and overwriting

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 * your own stack under you is bad idea.

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 */

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#include <linux/linkage.h>

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#include <asm/segment.h>

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#include <asm/page_types.h>

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#include <asm/asm-offsets.h>

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#include <asm/processor-flags.h>

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.text

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ENTRY(swsusp_arch_suspend)

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	movl %esp, saved_context_esp

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	movl %ebx, saved_context_ebx

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	movl %ebp, saved_context_ebp

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	movl %esi, saved_context_esi

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	movl %edi, saved_context_edi

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	pushfl

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	popl saved_context_eflags

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	call swsusp_save

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	ret

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ENTRY(restore_image)

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	movl	mmu_cr4_features, %ecx

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	movl	resume_pg_dir, %eax

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	subl	$__PAGE_OFFSET, %eax

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	movl	%eax, %cr3

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	jecxz	1f	# cr4 Pentium and higher, skip if zero

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	andl	$~(X86_CR4_PGE), %ecx

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	movl	%ecx, %cr4;  # turn off PGE

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	movl	%cr3, %eax;  # flush TLB

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	movl	%eax, %cr3

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1:

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	movl	restore_pblist, %edx

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	.p2align 4,,7

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copy_loop:

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	testl	%edx, %edx

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	jz	done

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	movl	pbe_address(%edx), %esi

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	movl	pbe_orig_address(%edx), %edi

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	movl	$1024, %ecx

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	rep

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	movsl

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	movl	pbe_next(%edx), %edx

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	jmp	copy_loop

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	.p2align 4,,7

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done:

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	/* go back to the original page tables */

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	movl	$swapper_pg_dir, %eax

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	subl	$__PAGE_OFFSET, %eax

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	movl	%eax, %cr3

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	movl	mmu_cr4_features, %ecx

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	jecxz	1f	# cr4 Pentium and higher, skip if zero

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	movl	%ecx, %cr4;  # turn PGE back on

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1:

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	movl saved_context_esp, %esp

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	movl saved_context_ebp, %ebp

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	movl saved_context_ebx, %ebx

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	movl saved_context_esi, %esi

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	movl saved_context_edi, %edi

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	pushl saved_context_eflags

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	popfl

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	xorl	%eax, %eax

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	ret

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