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kolibrios/drivers/acpi/tables.c
Sergey Semyonov (Serge) 9a7d86dfc0 acpi driver
git-svn-id: svn://kolibrios.org@6595 a494cfbc-eb01-0410-851d-a64ba20cac60
2016-10-15 02:03:01 +00:00

104 lines
2.8 KiB
C

/*
* acpi_tables.c - ACPI Boot-Time Table Parsing
*
* Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
*/
/* Uncomment next line to get verbose printout */
/* #define DEBUG */
#define pr_fmt(fmt) "ACPI: " fmt
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/acpi.h>
#define ACPI_MAX_TABLES 128
static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
static int acpi_apic_instance __initdata;
/*
* 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 = false;
/**
* 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)
{
struct acpi_table_header *table = NULL;
acpi_size tbl_size;
if (acpi_disabled)
return -ENODEV;
if (!id || !handler)
return -EINVAL;
if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
acpi_get_table_with_size(id, acpi_apic_instance, &table, &tbl_size);
else
acpi_get_table_with_size(id, 0, &table, &tbl_size);
if (table) {
handler(table);
early_acpi_os_unmap_memory(table, tbl_size);
return 0;
} else
return -ENODEV;
}
/*
* acpi_table_init()
*
* find RSDP, find and checksum SDT/XSDT.
* checksum all tables, print SDT/XSDT
*
* result: sdt_entry[] is initialized
*/
int __init acpi_table_init(void)
{
acpi_status status;
if (acpi_verify_table_checksum) {
pr_info("Early table checksum verification enabled\n");
acpi_gbl_verify_table_checksum = TRUE;
} else {
pr_info("Early table checksum verification disabled\n");
acpi_gbl_verify_table_checksum = FALSE;
}
status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
if (ACPI_FAILURE(status))
return -EINVAL;
return 0;
}