linux/drivers/acpi/acpica/tbfind.c
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   1/******************************************************************************
   2 *
   3 * Module Name: tbfind   - find table
   4 *
   5 *****************************************************************************/
   6
   7/*
   8 * Copyright (C) 2000 - 2011, Intel Corp.
   9 * All rights reserved.
  10 *
  11 * Redistribution and use in source and binary forms, with or without
  12 * modification, are permitted provided that the following conditions
  13 * are met:
  14 * 1. Redistributions of source code must retain the above copyright
  15 *    notice, this list of conditions, and the following disclaimer,
  16 *    without modification.
  17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18 *    substantially similar to the "NO WARRANTY" disclaimer below
  19 *    ("Disclaimer") and any redistribution must be conditioned upon
  20 *    including a substantially similar Disclaimer requirement for further
  21 *    binary redistribution.
  22 * 3. Neither the names of the above-listed copyright holders nor the names
  23 *    of any contributors may be used to endorse or promote products derived
  24 *    from this software without specific prior written permission.
  25 *
  26 * Alternatively, this software may be distributed under the terms of the
  27 * GNU General Public License ("GPL") version 2 as published by the Free
  28 * Software Foundation.
  29 *
  30 * NO WARRANTY
  31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41 * POSSIBILITY OF SUCH DAMAGES.
  42 */
  43
  44#include <acpi/acpi.h>
  45#include "accommon.h"
  46#include "actables.h"
  47
  48#define _COMPONENT          ACPI_TABLES
  49ACPI_MODULE_NAME("tbfind")
  50
  51/*******************************************************************************
  52 *
  53 * FUNCTION:    acpi_tb_find_table
  54 *
  55 * PARAMETERS:  Signature           - String with ACPI table signature
  56 *              oem_id              - String with the table OEM ID
  57 *              oem_table_id        - String with the OEM Table ID
  58 *              table_index         - Where the table index is returned
  59 *
  60 * RETURN:      Status and table index
  61 *
  62 * DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the
  63 *              Signature, OEM ID and OEM Table ID. Returns an index that can
  64 *              be used to get the table header or entire table.
  65 *
  66 ******************************************************************************/
  67acpi_status
  68acpi_tb_find_table(char *signature,
  69                   char *oem_id, char *oem_table_id, u32 *table_index)
  70{
  71        u32 i;
  72        acpi_status status;
  73        struct acpi_table_header header;
  74
  75        ACPI_FUNCTION_TRACE(tb_find_table);
  76
  77        /* Normalize the input strings */
  78
  79        ACPI_MEMSET(&header, 0, sizeof(struct acpi_table_header));
  80        ACPI_STRNCPY(header.signature, signature, ACPI_NAME_SIZE);
  81        ACPI_STRNCPY(header.oem_id, oem_id, ACPI_OEM_ID_SIZE);
  82        ACPI_STRNCPY(header.oem_table_id, oem_table_id, ACPI_OEM_TABLE_ID_SIZE);
  83
  84        /* Search for the table */
  85
  86        for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
  87                if (ACPI_MEMCMP(&(acpi_gbl_root_table_list.tables[i].signature),
  88                                header.signature, ACPI_NAME_SIZE)) {
  89
  90                        /* Not the requested table */
  91
  92                        continue;
  93                }
  94
  95                /* Table with matching signature has been found */
  96
  97                if (!acpi_gbl_root_table_list.tables[i].pointer) {
  98
  99                        /* Table is not currently mapped, map it */
 100
 101                        status =
 102                            acpi_tb_verify_table(&acpi_gbl_root_table_list.
 103                                                 tables[i]);
 104                        if (ACPI_FAILURE(status)) {
 105                                return_ACPI_STATUS(status);
 106                        }
 107
 108                        if (!acpi_gbl_root_table_list.tables[i].pointer) {
 109                                continue;
 110                        }
 111                }
 112
 113                /* Check for table match on all IDs */
 114
 115                if (!ACPI_MEMCMP
 116                    (acpi_gbl_root_table_list.tables[i].pointer->signature,
 117                     header.signature, ACPI_NAME_SIZE) && (!oem_id[0]
 118                                                           ||
 119                                                           !ACPI_MEMCMP
 120                                                           (acpi_gbl_root_table_list.
 121                                                            tables[i].pointer->
 122                                                            oem_id,
 123                                                            header.oem_id,
 124                                                            ACPI_OEM_ID_SIZE))
 125                    && (!oem_table_id[0]
 126                        || !ACPI_MEMCMP(acpi_gbl_root_table_list.tables[i].
 127                                        pointer->oem_table_id,
 128                                        header.oem_table_id,
 129                                        ACPI_OEM_TABLE_ID_SIZE))) {
 130                        *table_index = i;
 131
 132                        ACPI_DEBUG_PRINT((ACPI_DB_TABLES,
 133                                          "Found table [%4.4s]\n",
 134                                          header.signature));
 135                        return_ACPI_STATUS(AE_OK);
 136                }
 137        }
 138
 139        return_ACPI_STATUS(AE_NOT_FOUND);
 140}
 141