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/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright 2001-2003 Pavel Machek <pavel@suse.cz>
 * Based on code
 * Copyright 2001 Patrick Mochel <mochel@osdl.org>
 */
#ifndef _ASM_X86_SUSPEND_64_H
#define _ASM_X86_SUSPEND_64_H

#include <asm/desc.h>
#include <asm/fpu/api.h>

/*
 * Image of the saved processor state, used by the low level ACPI suspend to
 * RAM code and by the low level hibernation code.
 *
 * If you modify it, check how it is used in arch/x86/kernel/acpi/wakeup_64.S
 * and make sure that __save/__restore_processor_state(), defined in
 * arch/x86/power/cpu.c, still work as required.
 *
 * Because the structure is packed, make sure to avoid unaligned members. For
 * optimisation purposes but also because tools like kmemleak only search for
 * pointers that are aligned.
 */
struct saved_context {
	struct pt_regs regs;

	/*
	 * User CS and SS are saved in current_pt_regs().  The rest of the
	 * segment selectors need to be saved and restored here.
	 */
	u16 ds, es, fs, gs;

	/*
	 * Usermode FSBASE and GSBASE may not match the fs and gs selectors,
	 * so we save them separately.  We save the kernelmode GSBASE to
	 * restore percpu access after resume.
	 */
	unsigned long kernelmode_gs_base, usermode_gs_base, fs_base;

	unsigned long cr0, cr2, cr3, cr4;
	u64 misc_enable;
	struct saved_msrs saved_msrs;
	unsigned long efer;
	u16 gdt_pad; /* Unused */
	struct desc_ptr gdt_desc;
	u16 idt_pad;
	struct desc_ptr idt;
	u16 ldt;
	u16 tss;
	unsigned long tr;
	unsigned long safety;
	unsigned long return_address;
	bool misc_enable_saved;
} __attribute__((packed));

#define loaddebug(thread,register) \
	set_debugreg((thread)->debugreg##register, register)

/* routines for saving/restoring kernel state */
extern char core_restore_code[];
extern char restore_registers[];

#endif /* _ASM_X86_SUSPEND_64_H */