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#include <asm/msr.h>
13
14/*
15 * Image of the saved processor state, used by the low level ACPI suspend to
16 * RAM code and by the low level hibernation code.
17 *
18 * If you modify it, check how it is used in arch/x86/kernel/acpi/wakeup_64.S
19 * and make sure that __save/__restore_processor_state(), defined in
20 * arch/x86/power/cpu.c, still work as required.
21 *
22 * Because the structure is packed, make sure to avoid unaligned members. For
23 * optimisation purposes but also because tools like kmemleak only search for
24 * pointers that are aligned.
25 */
26struct saved_context {
27 struct pt_regs regs;
28
29 /*
30 * User CS and SS are saved in current_pt_regs(). The rest of the
31 * segment selectors need to be saved and restored here.
32 */
33 u16 ds, es, fs, gs;
34
35 /*
36 * Usermode FSBASE and GSBASE may not match the fs and gs selectors,
37 * so we save them separately. We save the kernelmode GSBASE to
38 * restore percpu access after resume.
39 */
40 unsigned long kernelmode_gs_base, usermode_gs_base, fs_base;
41
42 unsigned long cr0, cr2, cr3, cr4;
43 u64 misc_enable;
44 struct saved_msrs saved_msrs;
45 unsigned long efer;
46 u16 gdt_pad; /* Unused */
47 struct desc_ptr gdt_desc;
48 u16 idt_pad;
49 struct desc_ptr idt;
50 u16 ldt;
51 u16 tss;
52 unsigned long tr;
53 unsigned long safety;
54 unsigned long return_address;
55 bool misc_enable_saved;
56} __attribute__((packed));
57
58#define loaddebug(thread,register) \
59 set_debugreg((thread)->debugreg##register, register)
60
61/* routines for saving/restoring kernel state */
62extern char core_restore_code[];
63extern char restore_registers[];
64
65#endif /* _ASM_X86_SUSPEND_64_H */
66