1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
2 | .text |
3 | #include <linux/linkage.h> |
4 | #include <asm/segment.h> |
5 | #include <asm/page_types.h> |
6 | |
7 | # Copyright 2003, 2008 Pavel Machek <pavel@suse.cz |
8 | |
9 | .code32 |
10 | ALIGN |
11 | |
12 | SYM_CODE_START(wakeup_pmode_return) |
13 | movw $__KERNEL_DS, %ax |
14 | movw %ax, %ss |
15 | movw %ax, %fs |
16 | movw %ax, %gs |
17 | |
18 | movw $__USER_DS, %ax |
19 | movw %ax, %ds |
20 | movw %ax, %es |
21 | |
22 | # reload the gdt, as we need the full 32 bit address |
23 | lidt saved_idt |
24 | lldt saved_ldt |
25 | ljmp $(__KERNEL_CS), $1f |
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 |
39 | movl saved_eip, %eax |
40 | jmp *%eax |
41 | SYM_CODE_END(wakeup_pmode_return) |
42 | |
43 | bogus_magic: |
44 | jmp bogus_magic |
45 | |
46 | |
47 | |
48 | save_registers: |
49 | sidt saved_idt |
50 | sldt saved_ldt |
51 | str saved_tss |
52 | |
53 | leal 4(%esp), %eax |
54 | movl %eax, saved_context_esp |
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 |
63 | RET |
64 | |
65 | |
66 | restore_registers: |
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 |
74 | |
75 | SYM_CODE_START(do_suspend_lowlevel) |
76 | call save_processor_state |
77 | call save_registers |
78 | pushl $3 |
79 | call x86_acpi_enter_sleep_state |
80 | addl $4, %esp |
81 | |
82 | # In case of S3 failure, we'll emerge here. Jump |
83 | # to ret_point to recover |
84 | jmp ret_point |
85 | .p2align 4,,7 |
86 | ret_point: |
87 | call restore_registers |
88 | call restore_processor_state |
89 | RET |
90 | SYM_CODE_END(do_suspend_lowlevel) |
91 | |
92 | .data |
93 | ALIGN |
94 | SYM_DATA(saved_magic, .long 0) |
95 | saved_eip: .long 0 |
96 | |
97 | # saved registers |
98 | saved_idt: .long 0,0 |
99 | saved_ldt: .long 0 |
100 | saved_tss: .long 0 |
101 | |
102 | |