linux/drivers/acpi/tables.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  acpi_tables.c - ACPI Boot-Time Table Parsing
 *
 *  Copyright (C) 2001 Paul Diefenbaugh <[email protected]>
 */

/* Uncomment next line to get verbose printout */
/* #define DEBUG */
#define pr_fmt(fmt) …

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/smp.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/irq.h>
#include <linux/errno.h>
#include <linux/acpi.h>
#include <linux/memblock.h>
#include <linux/earlycpio.h>
#include <linux/initrd.h>
#include <linux/security.h>
#include <linux/kmemleak.h>
#include "internal.h"

#ifdef CONFIG_ACPI_CUSTOM_DSDT
#include CONFIG_ACPI_CUSTOM_DSDT_FILE
#endif

#define ACPI_MAX_TABLES …

static char *mps_inti_flags_polarity[] = …;
static char *mps_inti_flags_trigger[] = …;

static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;

static int acpi_apic_instance __initdata_or_acpilib;

/*
 * Disable table checksum verification for the early stage due to the size
 * limitation of the current x86 early mapping implementation.
 */
static bool acpi_verify_table_checksum __initdata_or_acpilib = …;

void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
{ … }

int __init_or_acpilib acpi_table_parse_entries_array(
	char *id, unsigned long table_size, struct acpi_subtable_proc *proc,
	int proc_num, unsigned int max_entries)
{ … }

static int __init_or_acpilib __acpi_table_parse_entries(
	char *id, unsigned long table_size, int entry_id,
	acpi_tbl_entry_handler handler, acpi_tbl_entry_handler_arg handler_arg,
	void *arg, unsigned int max_entries)
{ … }

int __init_or_acpilib
acpi_table_parse_cedt(enum acpi_cedt_type id,
		      acpi_tbl_entry_handler_arg handler_arg, void *arg)
{ … }
EXPORT_SYMBOL_ACPI_LIB(…);

int __init acpi_table_parse_entries(char *id, unsigned long table_size,
				    int entry_id,
				    acpi_tbl_entry_handler handler,
				    unsigned int max_entries)
{ … }

int __init acpi_table_parse_madt(enum acpi_madt_type id,
		      acpi_tbl_entry_handler handler, unsigned int max_entries)
{ … }

/**
 * acpi_table_parse - find table with @id, run @handler on it
 * @id: table id to find
 * @handler: handler to run
 *
 * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
 * run @handler on it.
 *
 * Return 0 if table found, -errno if not.
 */
int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
{ … }

/*
 * The BIOS is supposed to supply a single APIC/MADT,
 * but some report two.  Provide a knob to use either.
 * (don't you wish instance 0 and 1 were not the same?)
 */
static void __init check_multiple_madt(void)
{ … }

static void acpi_table_taint(struct acpi_table_header *table)
{ … }

#ifdef CONFIG_ACPI_TABLE_UPGRADE
static u64 acpi_tables_addr;
static int all_tables_size;

/* Copied from acpica/tbutils.c:acpi_tb_checksum() */
static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
{ … }

/* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
static const char table_sigs[][ACPI_NAMESEG_SIZE] __initconst = …;

#define ACPI_HEADER_SIZE …

#define NR_ACPI_INITRD_TABLES …
static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES];
static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);

#define MAP_CHUNK_SIZE …

void __init acpi_table_upgrade(void)
{ … }

static acpi_status
acpi_table_initrd_override(struct acpi_table_header *existing_table,
			   acpi_physical_address *address, u32 *length)
{ … }

static void __init acpi_table_initrd_scan(void)
{ … }
#else
static acpi_status
acpi_table_initrd_override(struct acpi_table_header *existing_table,
			   acpi_physical_address *address,
			   u32 *table_length)
{
	*table_length = 0;
	*address = 0;
	return AE_OK;
}

static void __init acpi_table_initrd_scan(void)
{
}
#endif /* CONFIG_ACPI_TABLE_UPGRADE */

acpi_status
acpi_os_physical_table_override(struct acpi_table_header *existing_table,
				acpi_physical_address *address,
				u32 *table_length)
{ … }

#ifdef CONFIG_ACPI_CUSTOM_DSDT
static void *amlcode __attribute__ ((weakref("AmlCode")));
static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code")));
#endif

acpi_status acpi_os_table_override(struct acpi_table_header *existing_table,
		       struct acpi_table_header **new_table)
{ … }

/*
 * acpi_locate_initial_tables()
 *
 * Get the RSDP, then find and checksum all the ACPI tables.
 *
 * result: initial_tables[] is initialized, and points to
 * a list of ACPI tables.
 */
int __init acpi_locate_initial_tables(void)
{ … }

void __init acpi_reserve_initial_tables(void)
{ … }

void __init acpi_table_init_complete(void)
{ … }

int __init acpi_table_init(void)
{ … }

static int __init acpi_parse_apic_instance(char *str)
{ … }
early_param(…);

static int __init acpi_force_table_verification_setup(char *s)
{ … }
early_param(…);

static int __init acpi_force_32bit_fadt_addr(char *s)
{ … }
early_param(…);