Commit | Line | Data |
---|---|---|
b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
c5759124 | 2 | /* |
1da177e4 LT |
3 | * This may not use any stack, nor any variable that is not "NoSave": |
4 | * | |
5 | * Its rewriting one kernel image with another. What is stack in "old" | |
6 | * image could very well be data page in "new" image, and overwriting | |
7 | * your own stack under you is bad idea. | |
8 | */ | |
9 | ||
10 | #include <linux/linkage.h> | |
11 | #include <asm/segment.h> | |
0341c14d | 12 | #include <asm/page_types.h> |
86feeaa8 | 13 | #include <asm/asm-offsets.h> |
c171f465 | 14 | #include <asm/processor-flags.h> |
1da177e4 | 15 | |
c171f465 | 16 | .text |
1da177e4 LT |
17 | |
18 | ENTRY(swsusp_arch_suspend) | |
1da177e4 LT |
19 | movl %esp, saved_context_esp |
20 | movl %ebx, saved_context_ebx | |
21 | movl %ebp, saved_context_ebp | |
22 | movl %esi, saved_context_esi | |
23 | movl %edi, saved_context_edi | |
c171f465 UB |
24 | pushfl |
25 | popl saved_context_eflags | |
1da177e4 LT |
26 | |
27 | call swsusp_save | |
28 | ret | |
29 | ||
2d4a34c9 | 30 | ENTRY(restore_image) |
8ae06d22 | 31 | movl mmu_cr4_features, %ecx |
e532c06f DF |
32 | movl resume_pg_dir, %eax |
33 | subl $__PAGE_OFFSET, %eax | |
34 | movl %eax, %cr3 | |
1da177e4 | 35 | |
8ae06d22 SL |
36 | jecxz 1f # cr4 Pentium and higher, skip if zero |
37 | andl $~(X86_CR4_PGE), %ecx | |
38 | movl %ecx, %cr4; # turn off PGE | |
39 | movl %cr3, %eax; # flush TLB | |
40 | movl %eax, %cr3 | |
41 | 1: | |
75534b50 | 42 | movl restore_pblist, %edx |
1da177e4 LT |
43 | .p2align 4,,7 |
44 | ||
45 | copy_loop: | |
46 | testl %edx, %edx | |
47 | jz done | |
48 | ||
49 | movl pbe_address(%edx), %esi | |
50 | movl pbe_orig_address(%edx), %edi | |
51 | ||
52 | movl $1024, %ecx | |
53 | rep | |
54 | movsl | |
55 | ||
56 | movl pbe_next(%edx), %edx | |
57 | jmp copy_loop | |
58 | .p2align 4,,7 | |
59 | ||
60 | done: | |
2d4a34c9 | 61 | /* go back to the original page tables */ |
e532c06f DF |
62 | movl $swapper_pg_dir, %eax |
63 | subl $__PAGE_OFFSET, %eax | |
64 | movl %eax, %cr3 | |
e532c06f DF |
65 | movl mmu_cr4_features, %ecx |
66 | jecxz 1f # cr4 Pentium and higher, skip if zero | |
e532c06f DF |
67 | movl %ecx, %cr4; # turn PGE back on |
68 | 1: | |
1da177e4 LT |
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 | ||
c171f465 UB |
76 | pushl saved_context_eflags |
77 | popfl | |
1da177e4 | 78 | |
cc456c4e KRW |
79 | /* Saved in save_processor_state. */ |
80 | movl $saved_context, %eax | |
81 | lgdt saved_context_gdt_desc(%eax) | |
82 | ||
1da177e4 LT |
83 | xorl %eax, %eax |
84 | ||
85 | ret |