| 0,0 → 1,103 |
|---|
| /* |
| * 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; |
| } |