1/*
2 * This may not use any stack, nor any variable that is not "NoSave":
3 *
4 * Its rewriting one kernel image with another. What is stack in "old"
5 * image could very well be data page in "new" image, and overwriting
6 * your own stack under you is bad idea.
7 */
8
9#include <linux/linkage.h>
10#include <asm/segment.h>
11#include <asm/page_types.h>
12#include <asm/asm-offsets.h>
13#include <asm/processor-flags.h>
14
15.text
16
17ENTRY(swsusp_arch_suspend)
18	movl %esp, saved_context_esp
19	movl %ebx, saved_context_ebx
20	movl %ebp, saved_context_ebp
21	movl %esi, saved_context_esi
22	movl %edi, saved_context_edi
23	pushfl
24	popl saved_context_eflags
25
26	call swsusp_save
27	ret
28
29ENTRY(restore_image)
30	movl	resume_pg_dir, %eax
31	subl	$__PAGE_OFFSET, %eax
32	movl	%eax, %cr3
33
34	movl	restore_pblist, %edx
35	.p2align 4,,7
36
37copy_loop:
38	testl	%edx, %edx
39	jz	done
40
41	movl	pbe_address(%edx), %esi
42	movl	pbe_orig_address(%edx), %edi
43
44	movl	$1024, %ecx
45	rep
46	movsl
47
48	movl	pbe_next(%edx), %edx
49	jmp	copy_loop
50	.p2align 4,,7
51
52done:
53	/* go back to the original page tables */
54	movl	$swapper_pg_dir, %eax
55	subl	$__PAGE_OFFSET, %eax
56	movl	%eax, %cr3
57	/* Flush TLB, including "global" things (vmalloc) */
58	movl	mmu_cr4_features, %ecx
59	jecxz	1f	# cr4 Pentium and higher, skip if zero
60	movl	%ecx, %edx
61	andl	$~(X86_CR4_PGE), %edx
62	movl	%edx, %cr4;  # turn off PGE
631:
64	movl	%cr3, %eax;  # flush TLB
65	movl	%eax, %cr3
66	jecxz	1f	# cr4 Pentium and higher, skip if zero
67	movl	%ecx, %cr4;  # turn PGE back on
681:
69
70	movl saved_context_esp, %esp
71	movl saved_context_ebp, %ebp
72	movl saved_context_ebx, %ebx
73	movl saved_context_esi, %esi
74	movl saved_context_edi, %edi
75
76	pushl saved_context_eflags
77	popfl
78
79	xorl	%eax, %eax
80
81	ret
82