1/******************************************************************************
2 *
3 * Module Name: tbfind   - find table
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2007, R. Byron Moore
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 <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,
68		   char *oem_id,
69		   char *oem_table_id, acpi_native_uint * table_index)
70{
71	acpi_native_uint i;
72	acpi_status status;
73
74	ACPI_FUNCTION_TRACE(tb_find_table);
75
76	for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
77		if (ACPI_MEMCMP(&(acpi_gbl_root_table_list.tables[i].signature),
78				signature, ACPI_NAME_SIZE)) {
79
80			/* Not the requested table */
81
82			continue;
83		}
84
85		/* Table with matching signature has been found */
86
87		if (!acpi_gbl_root_table_list.tables[i].pointer) {
88
89			/* Table is not currently mapped, map it */
90
91			status =
92			    acpi_tb_verify_table(&acpi_gbl_root_table_list.
93						 tables[i]);
94			if (ACPI_FAILURE(status)) {
95				return_ACPI_STATUS(status);
96			}
97
98			if (!acpi_gbl_root_table_list.tables[i].pointer) {
99				continue;
100			}
101		}
102
103		/* Check for table match on all IDs */
104
105		if (!ACPI_MEMCMP
106		    (acpi_gbl_root_table_list.tables[i].pointer->signature,
107		     signature, ACPI_NAME_SIZE) && (!oem_id[0]
108						    ||
109						    !ACPI_MEMCMP
110						    (acpi_gbl_root_table_list.
111						     tables[i].pointer->oem_id,
112						     oem_id, ACPI_OEM_ID_SIZE))
113		    && (!oem_table_id[0]
114			|| !ACPI_MEMCMP(acpi_gbl_root_table_list.tables[i].
115					pointer->oem_table_id, oem_table_id,
116					ACPI_OEM_TABLE_ID_SIZE))) {
117			*table_index = i;
118
119			ACPI_DEBUG_PRINT((ACPI_DB_TABLES,
120					  "Found table [%4.4s]\n", signature));
121			return_ACPI_STATUS(AE_OK);
122		}
123	}
124
125	return_ACPI_STATUS(AE_NOT_FOUND);
126}
127