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Bob Mooref3d2e782007-02-02 19:48:18 +03001/******************************************************************************
2 *
3 * Module Name: tbfind - find table
4 *
5 *****************************************************************************/
6
7/*
Len Brown75a44ce2008-04-23 23:00:13 -04008 * Copyright (C) 2000 - 2008, Intel Corp.
Bob Mooref3d2e782007-02-02 19:48:18 +03009 * 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 <acpi/actables.h>
46
47#define _COMPONENT ACPI_TABLES
48ACPI_MODULE_NAME("tbfind")
49
50/*******************************************************************************
51 *
52 * FUNCTION: acpi_tb_find_table
53 *
54 * PARAMETERS: Signature - String with ACPI table signature
55 * oem_id - String with the table OEM ID
56 * oem_table_id - String with the OEM Table ID
57 * table_index - Where the table index is returned
58 *
59 * RETURN: Status and table index
60 *
61 * DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the
62 * Signature, OEM ID and OEM Table ID. Returns an index that can
63 * be used to get the table header or entire table.
64 *
65 ******************************************************************************/
66acpi_status
67acpi_tb_find_table(char *signature,
Bob Moore67a119f2008-06-10 13:42:13 +080068 char *oem_id, char *oem_table_id, u32 *table_index)
Bob Mooref3d2e782007-02-02 19:48:18 +030069{
Bob Moore67a119f2008-06-10 13:42:13 +080070 u32 i;
Bob Mooref3d2e782007-02-02 19:48:18 +030071 acpi_status status;
Lin Ming47c08722008-04-10 19:06:42 +040072 struct acpi_table_header header;
Bob Mooref3d2e782007-02-02 19:48:18 +030073
74 ACPI_FUNCTION_TRACE(tb_find_table);
75
Lin Ming47c08722008-04-10 19:06:42 +040076 /* Normalize the input strings */
77
78 ACPI_MEMSET(&header, 0, sizeof(struct acpi_table_header));
79 ACPI_STRNCPY(header.signature, signature, ACPI_NAME_SIZE);
80 ACPI_STRNCPY(header.oem_id, oem_id, ACPI_OEM_ID_SIZE);
81 ACPI_STRNCPY(header.oem_table_id, oem_table_id, ACPI_OEM_TABLE_ID_SIZE);
82
83 /* Search for the table */
84
Bob Mooref3d2e782007-02-02 19:48:18 +030085 for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
86 if (ACPI_MEMCMP(&(acpi_gbl_root_table_list.tables[i].signature),
Lin Ming47c08722008-04-10 19:06:42 +040087 header.signature, ACPI_NAME_SIZE)) {
Bob Mooref3d2e782007-02-02 19:48:18 +030088
89 /* Not the requested table */
90
91 continue;
92 }
93
94 /* Table with matching signature has been found */
95
96 if (!acpi_gbl_root_table_list.tables[i].pointer) {
97
98 /* Table is not currently mapped, map it */
99
100 status =
101 acpi_tb_verify_table(&acpi_gbl_root_table_list.
102 tables[i]);
103 if (ACPI_FAILURE(status)) {
104 return_ACPI_STATUS(status);
105 }
106
107 if (!acpi_gbl_root_table_list.tables[i].pointer) {
108 continue;
109 }
110 }
111
112 /* Check for table match on all IDs */
113
114 if (!ACPI_MEMCMP
115 (acpi_gbl_root_table_list.tables[i].pointer->signature,
Lin Ming47c08722008-04-10 19:06:42 +0400116 header.signature, ACPI_NAME_SIZE) && (!oem_id[0]
117 ||
118 !ACPI_MEMCMP
119 (acpi_gbl_root_table_list.
120 tables[i].pointer->
121 oem_id,
122 header.oem_id,
123 ACPI_OEM_ID_SIZE))
Bob Mooref3d2e782007-02-02 19:48:18 +0300124 && (!oem_table_id[0]
125 || !ACPI_MEMCMP(acpi_gbl_root_table_list.tables[i].
Lin Ming47c08722008-04-10 19:06:42 +0400126 pointer->oem_table_id,
127 header.oem_table_id,
Bob Mooref3d2e782007-02-02 19:48:18 +0300128 ACPI_OEM_TABLE_ID_SIZE))) {
129 *table_index = i;
130
131 ACPI_DEBUG_PRINT((ACPI_DB_TABLES,
Lin Ming47c08722008-04-10 19:06:42 +0400132 "Found table [%4.4s]\n",
133 header.signature));
Bob Mooref3d2e782007-02-02 19:48:18 +0300134 return_ACPI_STATUS(AE_OK);
135 }
136 }
137
138 return_ACPI_STATUS(AE_NOT_FOUND);
139}