1 /******************************************************************************
2 *
3 * Module Name: tbfind - find table
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2008, 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 u32 i;
72 acpi_status status;
73 struct acpi_table_header header;
74
75 ACPI_FUNCTION_TRACE(tb_find_table);
76
77 /* Normalize the input strings */
78
79 ACPI_MEMSET(&header, 0, sizeof(struct acpi_table_header));
80 ACPI_STRNCPY(header.signature, signature, ACPI_NAME_SIZE);
81 ACPI_STRNCPY(header.oem_id, oem_id, ACPI_OEM_ID_SIZE);
82 ACPI_STRNCPY(header.oem_table_id, oem_table_id, ACPI_OEM_TABLE_ID_SIZE);
83
84 /* Search for the table */
85
86 for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
87 if (ACPI_MEMCMP(&(acpi_gbl_root_table_list.tables[i].signature),
88 header.signature, ACPI_NAME_SIZE)) {
89
90 /* Not the requested table */
91
92 continue;
93 }
94
95 /* Table with matching signature has been found */
96
97 if (!acpi_gbl_root_table_list.tables[i].pointer) {
98
99 /* Table is not currently mapped, map it */
100
101 status =
102 acpi_tb_verify_table(&acpi_gbl_root_table_list.
103 tables[i]);
104 if (ACPI_FAILURE(status)) {
105 return_ACPI_STATUS(status);
106 }
107
108 if (!acpi_gbl_root_table_list.tables[i].pointer) {
109 continue;
110 }
111 }
112
113 /* Check for table match on all IDs */
114
115 if (!ACPI_MEMCMP
116 (acpi_gbl_root_table_list.tables[i].pointer->signature,
117 header.signature, ACPI_NAME_SIZE) && (!oem_id[0]
118 ||
119 !ACPI_MEMCMP
120 (acpi_gbl_root_table_list.
121 tables[i].pointer->
122 oem_id,
123 header.oem_id,
124 ACPI_OEM_ID_SIZE))
125 && (!oem_table_id[0]
126 || !ACPI_MEMCMP(acpi_gbl_root_table_list.tables[i].
127 pointer->oem_table_id,
128 header.oem_table_id,
129 ACPI_OEM_TABLE_ID_SIZE))) {
130 *table_index = i;
131
132 ACPI_DEBUG_PRINT((ACPI_DB_TABLES,
133 "Found table [%4.4s]\n",
134 header.signature));
135 return_ACPI_STATUS(AE_OK);
136 }
137 }
138
139 return_ACPI_STATUS(AE_NOT_FOUND);
140 }
141
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