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tbfind.c
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1 /******************************************************************************
2  *
3  * Module Name: tbfind - find table
4  *
5  *****************************************************************************/
6 
7 /*
8  * Copyright (C) 2000 - 2012, 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.current_table_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 }
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