1 /****************************************************************************** 2 * 3 * Module Name: tbfind - find table 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2016, 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