1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright 2001-2003 Pavel Machek <pavel@suse.cz>
4 * Based on code
5 * Copyright 2001 Patrick Mochel <mochel@osdl.org>
6 */
7 #ifndef _ASM_X86_SUSPEND_64_H
8 #define _ASM_X86_SUSPEND_64_H
9
10 #include <asm/desc.h>
11 #include <asm/fpu/api.h>
12
13 /*
14 * Image of the saved processor state, used by the low level ACPI suspend to
15 * RAM code and by the low level hibernation code.
16 *
17 * If you modify it, check how it is used in arch/x86/kernel/acpi/wakeup_64.S
18 * and make sure that __save/__restore_processor_state(), defined in
19 * arch/x86/power/cpu.c, still work as required.
20 *
21 * Because the structure is packed, make sure to avoid unaligned members. For
22 * optimisation purposes but also because tools like kmemleak only search for
23 * pointers that are aligned.
24 */
25 struct saved_context {
26 struct pt_regs regs;
27
28 /*
29 * User CS and SS are saved in current_pt_regs(). The rest of the
30 * segment selectors need to be saved and restored here.
31 */
32 u16 ds, es, fs, gs;
33
34 /*
35 * Usermode FSBASE and GSBASE may not match the fs and gs selectors,
36 * so we save them separately. We save the kernelmode GSBASE to
37 * restore percpu access after resume.
38 */
39 unsigned long kernelmode_gs_base, usermode_gs_base, fs_base;
40
41 unsigned long cr0, cr2, cr3, cr4;
42 u64 misc_enable;
43 struct saved_msrs saved_msrs;
44 unsigned long efer;
45 u16 gdt_pad; /* Unused */
46 struct desc_ptr gdt_desc;
47 u16 idt_pad;
48 struct desc_ptr idt;
49 u16 ldt;
50 u16 tss;
51 unsigned long tr;
52 unsigned long safety;
53 unsigned long return_address;
54 bool misc_enable_saved;
55 } __attribute__((packed));
56
57 #define loaddebug(thread,register) \
58 set_debugreg((thread)->debugreg##register, register)
59
60 /* routines for saving/restoring kernel state */
61 extern char core_restore_code[];
62 extern char restore_registers[];
63
64 #endif /* _ASM_X86_SUSPEND_64_H */
65
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