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  1. /******************************************************************************
  2.  *
  3.  * Module Name: tbfind   - find table
  4.  *
  5.  *****************************************************************************/
  6.  
  7. /*
  8.  * Copyright (C) 2000 - 2015, 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
  49. ACPI_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.  ******************************************************************************/
  67. acpi_status
  68. acpi_tb_find_table(char *signature,
  69.                    char *oem_id, char *oem_table_id, u32 *table_index)
  70. {
  71.         acpi_status status;
  72.         struct acpi_table_header header;
  73.         u32 i;
  74.  
  75.         ACPI_FUNCTION_TRACE(tb_find_table);
  76.  
  77.         /* Validate the input table signature */
  78.  
  79.         if (!acpi_is_valid_signature(signature)) {
  80.                 return_ACPI_STATUS(AE_BAD_SIGNATURE);
  81.         }
  82.  
  83.         /* Don't allow the OEM strings to be too long */
  84.  
  85.         if ((strlen(oem_id) > ACPI_OEM_ID_SIZE) ||
  86.             (strlen(oem_table_id) > ACPI_OEM_TABLE_ID_SIZE)) {
  87.                 return_ACPI_STATUS(AE_AML_STRING_LIMIT);
  88.         }
  89.  
  90.         /* Normalize the input strings */
  91.  
  92.         memset(&header, 0, sizeof(struct acpi_table_header));
  93.         ACPI_MOVE_NAME(header.signature, signature);
  94.         strncpy(header.oem_id, oem_id, ACPI_OEM_ID_SIZE);
  95.         strncpy(header.oem_table_id, oem_table_id, ACPI_OEM_TABLE_ID_SIZE);
  96.  
  97.         /* Search for the table */
  98.  
  99.         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
  100.                 if (memcmp(&(acpi_gbl_root_table_list.tables[i].signature),
  101.                            header.signature, ACPI_NAME_SIZE)) {
  102.  
  103.                         /* Not the requested table */
  104.  
  105.                         continue;
  106.                 }
  107.  
  108.                 /* Table with matching signature has been found */
  109.  
  110.                 if (!acpi_gbl_root_table_list.tables[i].pointer) {
  111.  
  112.                         /* Table is not currently mapped, map it */
  113.  
  114.                         status =
  115.                             acpi_tb_validate_table(&acpi_gbl_root_table_list.
  116.                                                    tables[i]);
  117.                         if (ACPI_FAILURE(status)) {
  118.                                 return_ACPI_STATUS(status);
  119.                         }
  120.  
  121.                         if (!acpi_gbl_root_table_list.tables[i].pointer) {
  122.                                 continue;
  123.                         }
  124.                 }
  125.  
  126.                 /* Check for table match on all IDs */
  127.  
  128.                 if (!memcmp
  129.                     (acpi_gbl_root_table_list.tables[i].pointer->signature,
  130.                      header.signature, ACPI_NAME_SIZE) && (!oem_id[0]
  131.                                                            ||
  132.                                                            !memcmp
  133.                                                            (acpi_gbl_root_table_list.
  134.                                                             tables[i].pointer->
  135.                                                             oem_id,
  136.                                                             header.oem_id,
  137.                                                             ACPI_OEM_ID_SIZE))
  138.                     && (!oem_table_id[0]
  139.                         || !memcmp(acpi_gbl_root_table_list.tables[i].pointer->
  140.                                    oem_table_id, header.oem_table_id,
  141.                                    ACPI_OEM_TABLE_ID_SIZE))) {
  142.                         *table_index = i;
  143.  
  144.                         ACPI_DEBUG_PRINT((ACPI_DB_TABLES,
  145.                                           "Found table [%4.4s]\n",
  146.                                           header.signature));
  147.                         return_ACPI_STATUS(AE_OK);
  148.                 }
  149.         }
  150.  
  151.         return_ACPI_STATUS(AE_NOT_FOUND);
  152. }
  153.