linux/arch/x86/power/hibernate.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Hibernation support for x86
 *
 * Copyright (c) 2007 Rafael J. Wysocki <[email protected]>
 * Copyright (c) 2002 Pavel Machek <[email protected]>
 * Copyright (c) 2001 Patrick Mochel <[email protected]>
 */
#include <linux/gfp.h>
#include <linux/smp.h>
#include <linux/suspend.h>
#include <linux/scatterlist.h>
#include <linux/kdebug.h>
#include <linux/cpu.h>
#include <linux/pgtable.h>
#include <linux/types.h>
#include <linux/crc32.h>

#include <asm/e820/api.h>
#include <asm/init.h>
#include <asm/proto.h>
#include <asm/page.h>
#include <asm/mtrr.h>
#include <asm/sections.h>
#include <asm/suspend.h>
#include <asm/tlbflush.h>

/*
 * Address to jump to in the last phase of restore in order to get to the image
 * kernel's text (this value is passed in the image header).
 */
unsigned long restore_jump_address __visible;
unsigned long jump_address_phys;

/*
 * Value of the cr3 register from before the hibernation (this value is passed
 * in the image header).
 */
unsigned long restore_cr3 __visible;
unsigned long temp_pgt __visible;
unsigned long relocated_restore_code __visible;

/**
 *	pfn_is_nosave - check if given pfn is in the 'nosave' section
 */
int pfn_is_nosave(unsigned long pfn)
{ … }

struct restore_data_record { … };

/**
 * compute_e820_crc32 - calculate crc32 of a given e820 table
 *
 * @table: the e820 table to be calculated
 *
 * Return: the resulting checksum
 */
static inline u32 compute_e820_crc32(struct e820_table *table)
{ … }

#ifdef CONFIG_X86_64
#define RESTORE_MAGIC …
#else
#define RESTORE_MAGIC …
#endif

/**
 *	arch_hibernation_header_save - populate the architecture specific part
 *		of a hibernation image header
 *	@addr: address to save the data at
 */
int arch_hibernation_header_save(void *addr, unsigned int max_size)
{ … }

/**
 *	arch_hibernation_header_restore - read the architecture specific data
 *		from the hibernation image header
 *	@addr: address to read the data from
 */
int arch_hibernation_header_restore(void *addr)
{ … }

int relocate_restore_code(void)
{ … }

int arch_resume_nosmt(void)
{ … }