1 /****************************************************************************** 2 * 3 * Module Name: tbfind - find table 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2021, 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 MERCHANTABILITY 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.h" 45 #include "accommon.h" 46 #include "actables.h" 47 48 #define _COMPONENT ACPI_TABLES 49 ACPI_MODULE_NAME ("tbfind") 50 51 52 /******************************************************************************* 53 * 54 * FUNCTION: AcpiTbFindTable 55 * 56 * PARAMETERS: Signature - String with ACPI table signature 57 * OemId - String with the table OEM ID 58 * OemTableId - String with the OEM Table ID 59 * TableIndex - Where the table index is returned 60 * 61 * RETURN: Status and table index 62 * 63 * DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the 64 * Signature, OEM ID and OEM Table ID. Returns an index that can 65 * be used to get the table header or entire table. 66 * 67 ******************************************************************************/ 68 69 ACPI_STATUS 70 AcpiTbFindTable ( 71 char *Signature, 72 char *OemId, 73 char *OemTableId, 74 UINT32 *TableIndex) 75 { 76 ACPI_STATUS Status = AE_OK; 77 ACPI_TABLE_HEADER Header; 78 UINT32 i; 79 80 81 ACPI_FUNCTION_TRACE (TbFindTable); 82 83 84 /* Validate the input table signature */ 85 86 if (!AcpiUtValidNameseg (Signature)) 87 { 88 return_ACPI_STATUS (AE_BAD_SIGNATURE); 89 } 90 91 /* Don't allow the OEM strings to be too long */ 92 93 if ((strlen (OemId) > ACPI_OEM_ID_SIZE) || 94 (strlen (OemTableId) > ACPI_OEM_TABLE_ID_SIZE)) 95 { 96 return_ACPI_STATUS (AE_AML_STRING_LIMIT); 97 } 98 99 /* Normalize the input strings */ 100 101 memset (&Header, 0, sizeof (ACPI_TABLE_HEADER)); 102 ACPI_COPY_NAMESEG (Header.Signature, Signature); 103 strncpy (Header.OemId, OemId, ACPI_OEM_ID_SIZE); 104 strncpy (Header.OemTableId, OemTableId, ACPI_OEM_TABLE_ID_SIZE); 105 106 /* Search for the table */ 107 108 (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES); 109 for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; ++i) 110 { 111 if (memcmp (&(AcpiGbl_RootTableList.Tables[i].Signature), 112 Header.Signature, ACPI_NAMESEG_SIZE)) 113 { 114 /* Not the requested table */ 115 116 continue; 117 } 118 119 /* Table with matching signature has been found */ 120 121 if (!AcpiGbl_RootTableList.Tables[i].Pointer) 122 { 123 /* Table is not currently mapped, map it */ 124 125 Status = AcpiTbValidateTable (&AcpiGbl_RootTableList.Tables[i]); 126 if (ACPI_FAILURE (Status)) 127 { 128 goto UnlockAndExit; 129 } 130 131 if (!AcpiGbl_RootTableList.Tables[i].Pointer) 132 { 133 continue; 134 } 135 } 136 137 /* Check for table match on all IDs */ 138 139 if (!memcmp (AcpiGbl_RootTableList.Tables[i].Pointer->Signature, 140 Header.Signature, ACPI_NAMESEG_SIZE) && 141 (!OemId[0] || 142 !memcmp (AcpiGbl_RootTableList.Tables[i].Pointer->OemId, 143 Header.OemId, ACPI_OEM_ID_SIZE)) && 144 (!OemTableId[0] || 145 !memcmp (AcpiGbl_RootTableList.Tables[i].Pointer->OemTableId, 146 Header.OemTableId, ACPI_OEM_TABLE_ID_SIZE))) 147 { 148 *TableIndex = i; 149 150 ACPI_DEBUG_PRINT ((ACPI_DB_TABLES, "Found table [%4.4s]\n", 151 Header.Signature)); 152 goto UnlockAndExit; 153 } 154 } 155 Status = AE_NOT_FOUND; 156 157 UnlockAndExit: 158 (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES); 159 return_ACPI_STATUS (Status); 160 } 161