104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/*
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* acpi_tables.c - ACPI Boot-Time Table Parsing
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*
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* Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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*/
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/* Uncomment next line to get verbose printout */
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/* #define DEBUG */
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#define pr_fmt(fmt) "ACPI: " fmt
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/acpi.h>
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#define ACPI_MAX_TABLES 128
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static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
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static int acpi_apic_instance __initdata;
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/*
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* Disable table checksum verification for the early stage due to the size
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* limitation of the current x86 early mapping implementation.
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*/
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static bool acpi_verify_table_checksum __initdata = false;
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/**
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* acpi_table_parse - find table with @id, run @handler on it
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* @id: table id to find
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* @handler: handler to run
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*
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* Scan the ACPI System Descriptor Table (STD) for a table matching @id,
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* run @handler on it.
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*
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* Return 0 if table found, -errno if not.
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*/
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int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
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{
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struct acpi_table_header *table = NULL;
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acpi_size tbl_size;
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if (acpi_disabled)
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return -ENODEV;
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if (!id || !handler)
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return -EINVAL;
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if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
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acpi_get_table_with_size(id, acpi_apic_instance, &table, &tbl_size);
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else
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acpi_get_table_with_size(id, 0, &table, &tbl_size);
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if (table) {
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handler(table);
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early_acpi_os_unmap_memory(table, tbl_size);
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return 0;
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} else
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return -ENODEV;
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}
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/*
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* acpi_table_init()
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*
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* find RSDP, find and checksum SDT/XSDT.
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* checksum all tables, print SDT/XSDT
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*
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* result: sdt_entry[] is initialized
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*/
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int __init acpi_table_init(void)
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{
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acpi_status status;
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if (acpi_verify_table_checksum) {
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pr_info("Early table checksum verification enabled\n");
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acpi_gbl_verify_table_checksum = TRUE;
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} else {
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pr_info("Early table checksum verification disabled\n");
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acpi_gbl_verify_table_checksum = FALSE;
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}
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status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
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if (ACPI_FAILURE(status))
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return -EINVAL;
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return 0;
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}
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