xref: /linux/arch/x86/include/asm/suspend_64.h (revision ab93e0dd72c37d378dd936f031ffb83ff2bd87ce)
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  */
26 struct 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 */
62 extern char core_restore_code[];
63 extern char restore_registers[];
64 
65 #endif /* _ASM_X86_SUSPEND_64_H */
66