projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| c5759124 | 1 | /* |
| 1da177e4 LT |
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> | |
| 0341c14d | 11 | #include <asm/page_types.h> |
| 86feeaa8 | 12 | #include <asm/asm-offsets.h> |
| c171f465 | 13 | #include <asm/processor-flags.h> |
| 1da177e4 | 14 | |
| c171f465 | 15 | .text |
| 1da177e4 LT |
16 | |
| 17 | ENTRY(swsusp_arch_suspend) | |
| 1da177e4 LT |
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 | |
| c171f465 UB |
23 | pushfl |
| 24 | popl saved_context_eflags | |
| 1da177e4 LT |
25 | |
| 26 | call swsusp_save | |
| 27 | ret | |
| 28 | ||
| 2d4a34c9 | 29 | ENTRY(restore_image) |
| 8ae06d22 | 30 | movl mmu_cr4_features, %ecx |
| e532c06f DF |
31 | movl resume_pg_dir, %eax |
| 32 | subl $__PAGE_OFFSET, %eax | |
| 33 | movl %eax, %cr3 | |
| 1da177e4 | 34 | |
| 8ae06d22 SL |
35 | jecxz 1f # cr4 Pentium and higher, skip if zero |
| 36 | andl $~(X86_CR4_PGE), %ecx | |
| 37 | movl %ecx, %cr4; # turn off PGE | |
| 38 | movl %cr3, %eax; # flush TLB | |
| 39 | movl %eax, %cr3 | |
| 40 | 1: | |
| 75534b50 | 41 | movl restore_pblist, %edx |
| 1da177e4 LT |
42 | .p2align 4,,7 |
| 43 | ||
| 44 | copy_loop: | |
| 45 | testl %edx, %edx | |
| 46 | jz done | |
| 47 | ||
| 48 | movl pbe_address(%edx), %esi | |
| 49 | movl pbe_orig_address(%edx), %edi | |
| 50 | ||
| 51 | movl $1024, %ecx | |
| 52 | rep | |
| 53 | movsl | |
| 54 | ||
| 55 | movl pbe_next(%edx), %edx | |
| 56 | jmp copy_loop | |
| 57 | .p2align 4,,7 | |
| 58 | ||
| 59 | done: | |
| 2d4a34c9 | 60 | /* go back to the original page tables */ |
| e532c06f DF |
61 | movl $swapper_pg_dir, %eax |
| 62 | subl $__PAGE_OFFSET, %eax | |
| 63 | movl %eax, %cr3 | |
| e532c06f DF |
64 | movl mmu_cr4_features, %ecx |
| 65 | jecxz 1f # cr4 Pentium and higher, skip if zero | |
| e532c06f DF |
66 | movl %ecx, %cr4; # turn PGE back on |
| 67 | 1: | |
| 1da177e4 LT |
68 | |
| 69 | movl saved_context_esp, %esp | |
| 70 | movl saved_context_ebp, %ebp | |
| 71 | movl saved_context_ebx, %ebx | |
| 72 | movl saved_context_esi, %esi | |
| 73 | movl saved_context_edi, %edi | |
| 74 | ||
| c171f465 UB |
75 | pushl saved_context_eflags |
| 76 | popfl | |
| 1da177e4 | 77 | |
| cc456c4e KRW |
78 | /* Saved in save_processor_state. */ |
| 79 | movl $saved_context, %eax | |
| 80 | lgdt saved_context_gdt_desc(%eax) | |
| 81 | ||
| 1da177e4 LT |
82 | xorl %eax, %eax |
| 83 | ||
| 84 | ret |