1/******************************************************************************
2 *
3 * Module Name: tbfind   - find table
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2014, 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
49ACPI_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 ******************************************************************************/
67acpi_status
68acpi_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_MOVE_NAME(header.signature, signature);
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_validate_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