projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 767a67b0 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| ec7fd344 | 2 | .text |
| 1da177e4 LT |
3 | #include <linux/linkage.h> |
| 4 | #include <asm/segment.h> | |
| 0341c14d | 5 | #include <asm/page_types.h> |
| 1da177e4 | 6 | |
| 767a67b0 | 7 | # Copyright 2003, 2008 Pavel Machek <pavel@suse.cz |
| 1da177e4 | 8 | |
| 1da177e4 LT |
9 | .code32 |
| 10 | ALIGN | |
| 11 | ||
| 78762b0e | 12 | SYM_CODE_START(wakeup_pmode_return) |
| 1da177e4 LT |
13 | movw $__KERNEL_DS, %ax |
| 14 | movw %ax, %ss | |
| 1da177e4 LT |
15 | movw %ax, %fs |
| 16 | movw %ax, %gs | |
| 1da177e4 | 17 | |
| ffa64eff IM |
18 | movw $__USER_DS, %ax |
| 19 | movw %ax, %ds | |
| 20 | movw %ax, %es | |
| 21 | ||
| 1da177e4 | 22 | # reload the gdt, as we need the full 32 bit address |
| 1da177e4 LT |
23 | lidt saved_idt |
| 24 | lldt saved_ldt | |
| e44b7b75 | 25 | ljmp $(__KERNEL_CS), $1f |
| 1da177e4 LT |
26 | 1: |
| 27 | movl %cr3, %eax | |
| 28 | movl %eax, %cr3 | |
| 29 | wbinvd | |
| 30 | ||
| 31 | # and restore the stack ... but you need gdt for this to work | |
| 32 | movl saved_context_esp, %esp | |
| 33 | ||
| 34 | movl %cs:saved_magic, %eax | |
| 35 | cmpl $0x12345678, %eax | |
| 36 | jne bogus_magic | |
| 37 | ||
| 38 | # jump to place where we left off | |
| e44b7b75 | 39 | movl saved_eip, %eax |
| 1da177e4 | 40 | jmp *%eax |
| 78762b0e | 41 | SYM_CODE_END(wakeup_pmode_return) |
| 1da177e4 LT |
42 | |
| 43 | bogus_magic: | |
| 1da177e4 LT |
44 | jmp bogus_magic |
| 45 | ||
| 46 | ||
| 1da177e4 | 47 | |
| e44b7b75 | 48 | save_registers: |
| 1da177e4 LT |
49 | sidt saved_idt |
| 50 | sldt saved_ldt | |
| 51 | str saved_tss | |
| 52 | ||
| 1da177e4 LT |
53 | leal 4(%esp), %eax |
| 54 | movl %eax, saved_context_esp | |
| e44b7b75 PM |
55 | movl %ebx, saved_context_ebx |
| 56 | movl %ebp, saved_context_ebp | |
| 57 | movl %esi, saved_context_esi | |
| 58 | movl %edi, saved_context_edi | |
| 59 | pushfl | |
| 60 | popl saved_context_eflags | |
| 61 | ||
| 62 | movl $ret_point, saved_eip | |
| 1da177e4 LT |
63 | ret |
| 64 | ||
| 65 | ||
| 66 | restore_registers: | |
| e44b7b75 PM |
67 | movl saved_context_ebp, %ebp |
| 68 | movl saved_context_ebx, %ebx | |
| 69 | movl saved_context_esi, %esi | |
| 70 | movl saved_context_edi, %edi | |
| 71 | pushl saved_context_eflags | |
| 72 | popfl | |
| 73 | ret | |
| 1da177e4 | 74 | |
| 78762b0e | 75 | SYM_CODE_START(do_suspend_lowlevel) |
| 1da177e4 LT |
76 | call save_processor_state |
| 77 | call save_registers | |
| 3b6961ba | 78 | pushl $3 |
| 40bce100 | 79 | call x86_acpi_enter_sleep_state |
| 3b6961ba | 80 | addl $4, %esp |
| 4e6e6504 WM |
81 | |
| 82 | # In case of S3 failure, we'll emerge here. Jump | |
| 83 | # to ret_point to recover | |
| 84 | jmp ret_point | |
| 1da177e4 LT |
85 | .p2align 4,,7 |
| 86 | ret_point: | |
| 87 | call restore_registers | |
| 88 | call restore_processor_state | |
| 89 | ret | |
| 78762b0e | 90 | SYM_CODE_END(do_suspend_lowlevel) |
| 1da177e4 | 91 | |
| daacf8bc | 92 | .data |
| 1da177e4 | 93 | ALIGN |
| 37503f73 | 94 | SYM_DATA(saved_magic, .long 0) |
| 5a064d39 | 95 | saved_eip: .long 0 |
| daacf8bc | 96 | |
| 1da177e4 | 97 | # saved registers |
| 1da177e4 LT |
98 | saved_idt: .long 0,0 |
| 99 | saved_ldt: .long 0 | |
| 100 | saved_tss: .long 0 | |
| 101 |