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 */
25struct 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 */
61extern char core_restore_code[];
62extern char restore_registers[];
63
64#endif /* _ASM_X86_SUSPEND_64_H */
65