linux/arch/x86/kernel/acpi/sleep.c

// SPDX-License-Identifier: GPL-2.0
/*
 * sleep.c - x86-specific ACPI sleep support.
 *
 *  Copyright (C) 2001-2003 Patrick Mochel
 *  Copyright (C) 2001-2003 Pavel Machek <[email protected]>
 */

#include <linux/acpi.h>
#include <linux/memblock.h>
#include <linux/dmi.h>
#include <linux/cpumask.h>
#include <linux/pgtable.h>
#include <asm/segment.h>
#include <asm/desc.h>
#include <asm/cacheflush.h>
#include <asm/realmode.h>
#include <asm/hypervisor.h>
#include <asm/smp.h>

#include <linux/ftrace.h>
#include "../../realmode/rm/wakeup.h"
#include "sleep.h"

unsigned long acpi_realmode_flags;

#if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
static char temp_stack[4096];
#endif

/**
 * acpi_get_wakeup_address - provide physical address for S3 wakeup
 *
 * Returns the physical address where the kernel should be resumed after the
 * system awakes from S3, e.g. for programming into the firmware waking vector.
 */
unsigned long acpi_get_wakeup_address(void)
{ … }

/**
 * x86_acpi_enter_sleep_state - enter sleep state
 * @state: Sleep state to enter.
 *
 * Wrapper around acpi_enter_sleep_state() to be called by assembly.
 */
asmlinkage acpi_status __visible x86_acpi_enter_sleep_state(u8 state)
{ … }

/**
 * x86_acpi_suspend_lowlevel - save kernel state
 *
 * Create an identity mapped page table and copy the wakeup routine to
 * low memory.
 */
int x86_acpi_suspend_lowlevel(void)
{ … }

static int __init acpi_sleep_setup(char *str)
{ … }

__setup(…);

#if defined(CONFIG_HIBERNATION) && defined(CONFIG_HYPERVISOR_GUEST)
static int __init init_s4_sigcheck(void)
{ … }
/* This must happen before acpi_init() which is a subsys initcall */
arch_initcall(init_s4_sigcheck);
#endif