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

// SPDX-License-Identifier: GPL-2.0-or-later
#include <linux/acpi.h>
#include <linux/cpu.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/kexec.h>
#include <linux/memblock.h>
#include <linux/pgtable.h>
#include <linux/sched/hotplug.h>
#include <asm/apic.h>
#include <asm/barrier.h>
#include <asm/init.h>
#include <asm/intel_pt.h>
#include <asm/nmi.h>
#include <asm/processor.h>
#include <asm/reboot.h>

/* Physical address of the Multiprocessor Wakeup Structure mailbox */
static u64 acpi_mp_wake_mailbox_paddr __ro_after_init;

/* Virtual address of the Multiprocessor Wakeup Structure mailbox */
static struct acpi_madt_multiproc_wakeup_mailbox *acpi_mp_wake_mailbox __ro_after_init;

static u64 acpi_mp_pgd __ro_after_init;
static u64 acpi_mp_reset_vector_paddr __ro_after_init;

static void acpi_mp_stop_this_cpu(void)
{ … }

static void acpi_mp_play_dead(void)
{ … }

static void acpi_mp_cpu_die(unsigned int cpu)
{ … }

/* The argument is required to match type of x86_mapping_info::alloc_pgt_page */
static void __init *alloc_pgt_page(void *dummy)
{ … }

static void __init free_pgt_page(void *pgt, void *dummy)
{ … }

/*
 * Make sure asm_acpi_mp_play_dead() is present in the identity mapping at
 * the same place as in the kernel page tables. asm_acpi_mp_play_dead() switches
 * to the identity mapping and the function has be present at the same spot in
 * the virtual address space before and after switching page tables.
 */
static int __init init_transition_pgtable(pgd_t *pgd)
{ … }

static int __init acpi_mp_setup_reset(u64 reset_vector)
{ … }

static int acpi_wakeup_cpu(u32 apicid, unsigned long start_ip)
{ … }

static void acpi_mp_disable_offlining(struct acpi_madt_multiproc_wakeup *mp_wake)
{ … }

int __init acpi_parse_mp_wake(union acpi_subtable_headers *header,
			      const unsigned long end)
{ … }