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 }