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 #define __TBFIND_C__ 45 46 #include "acpi.h" 47 #include "accommon.h" 48 #include "actables.h" 49 50 #define _COMPONENT ACPI_TABLES 51 ACPI_MODULE_NAME ("tbfind") 52 53 54 /******************************************************************************* 55 * 56 * FUNCTION: AcpiTbFindTable 57 * 58 * PARAMETERS: Signature - String with ACPI table signature 59 * OemId - String with the table OEM ID 60 * OemTableId - String with the OEM Table ID 61 * TableIndex - Where the table index is returned 62 * 63 * RETURN: Status and table index 64 * 65 * DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the 66 * Signature, OEM ID and OEM Table ID. Returns an index that can 67 * be used to get the table header or entire table. 68 * 69 ******************************************************************************/ 70 71 ACPI_STATUS 72 AcpiTbFindTable ( 73 char *Signature, 74 char *OemId, 75 char *OemTableId, 76 UINT32 *TableIndex) 77 { 78 UINT32 i; 79 ACPI_STATUS Status; 80 ACPI_TABLE_HEADER Header; 81 82 83 ACPI_FUNCTION_TRACE (TbFindTable); 84 85 86 /* Normalize the input strings */ 87 88 ACPI_MEMSET (&Header, 0, sizeof (ACPI_TABLE_HEADER)); 89 ACPI_STRNCPY (Header.Signature, Signature, ACPI_NAME_SIZE); 90 ACPI_STRNCPY (Header.OemId, OemId, ACPI_OEM_ID_SIZE); 91 ACPI_STRNCPY (Header.OemTableId, OemTableId, ACPI_OEM_TABLE_ID_SIZE); 92 93 /* Search for the table */ 94 95 for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; ++i) 96 { 97 if (ACPI_MEMCMP (&(AcpiGbl_RootTableList.Tables[i].Signature), 98 Header.Signature, ACPI_NAME_SIZE)) 99 { 100 /* Not the requested table */ 101 102 continue; 103 } 104 105 /* Table with matching signature has been found */ 106 107 if (!AcpiGbl_RootTableList.Tables[i].Pointer) 108 { 109 /* Table is not currently mapped, map it */ 110 111 Status = AcpiTbVerifyTable (&AcpiGbl_RootTableList.Tables[i]); 112 if (ACPI_FAILURE (Status)) 113 { 114 return_ACPI_STATUS (Status); 115 } 116 117 if (!AcpiGbl_RootTableList.Tables[i].Pointer) 118 { 119 continue; 120 } 121 } 122 123 /* Check for table match on all IDs */ 124 125 if (!ACPI_MEMCMP (AcpiGbl_RootTableList.Tables[i].Pointer->Signature, 126 Header.Signature, ACPI_NAME_SIZE) && 127 (!OemId[0] || 128 !ACPI_MEMCMP (AcpiGbl_RootTableList.Tables[i].Pointer->OemId, 129 Header.OemId, ACPI_OEM_ID_SIZE)) && 130 (!OemTableId[0] || 131 !ACPI_MEMCMP (AcpiGbl_RootTableList.Tables[i].Pointer->OemTableId, 132 Header.OemTableId, ACPI_OEM_TABLE_ID_SIZE))) 133 { 134 *TableIndex = i; 135 136 ACPI_DEBUG_PRINT ((ACPI_DB_TABLES, "Found table [%4.4s]\n", 137 Header.Signature)); 138 return_ACPI_STATUS (AE_OK); 139 } 140 } 141 142 return_ACPI_STATUS (AE_NOT_FOUND); 143 } 144