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192.168.1.100 / T103 / 1f884588077ad3476b9c91cbb0ee9ee0332bbb68 / . / src / kernel / linux / v4.14 / drivers / acpi / acpica / tbfind.c
blob: fea89c8d305cb405bc541d58157ac6cc92cffa9c [file] [log] [blame]
rjw1f884582022-01-06 17:20:42 +0800[diff] [blame^]1/******************************************************************************
2 *
3 * Module Name: tbfind - find table
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2017, 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 acpi_status status = AE_OK;
72 struct acpi_table_header header;
73 u32 i;
74
75 ACPI_FUNCTION_TRACE(tb_find_table);
76
77 /* Validate the input table signature */
78
79 if (!acpi_ut_valid_nameseg(signature)) {
80 return_ACPI_STATUS(AE_BAD_SIGNATURE);
81 }
82
83 /* Don't allow the OEM strings to be too long */
84
85 if ((strlen(oem_id) > ACPI_OEM_ID_SIZE) ||
86 (strlen(oem_table_id) > ACPI_OEM_TABLE_ID_SIZE)) {
87 return_ACPI_STATUS(AE_AML_STRING_LIMIT);
88 }
89
90 /* Normalize the input strings */
91
92 memset(&header, 0, sizeof(struct acpi_table_header));
93 ACPI_MOVE_NAME(header.signature, signature);
94 strncpy(header.oem_id, oem_id, ACPI_OEM_ID_SIZE);
95 strncpy(header.oem_table_id, oem_table_id, ACPI_OEM_TABLE_ID_SIZE);
96
97 /* Search for the table */
98
99 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
100 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
101 if (memcmp(&(acpi_gbl_root_table_list.tables[i].signature),
102 header.signature, ACPI_NAME_SIZE)) {
103
104 /* Not the requested table */
105
106 continue;
107 }
108
109 /* Table with matching signature has been found */
110
111 if (!acpi_gbl_root_table_list.tables[i].pointer) {
112
113 /* Table is not currently mapped, map it */
114
115 status =
116 acpi_tb_validate_table(&acpi_gbl_root_table_list.
117 tables[i]);
118 if (ACPI_FAILURE(status)) {
119 goto unlock_and_exit;
120 }
121
122 if (!acpi_gbl_root_table_list.tables[i].pointer) {
123 continue;
124 }
125 }
126
127 /* Check for table match on all IDs */
128
129 if (!memcmp
130 (acpi_gbl_root_table_list.tables[i].pointer->signature,
131 header.signature, ACPI_NAME_SIZE) && (!oem_id[0]
132 ||
133 !memcmp
134 (acpi_gbl_root_table_list.
135 tables[i].pointer->
136 oem_id,
137 header.oem_id,
138 ACPI_OEM_ID_SIZE))
139 && (!oem_table_id[0]
140 || !memcmp(acpi_gbl_root_table_list.tables[i].pointer->
141 oem_table_id, header.oem_table_id,
142 ACPI_OEM_TABLE_ID_SIZE))) {
143 *table_index = i;
144
145 ACPI_DEBUG_PRINT((ACPI_DB_TABLES,
146 "Found table [%4.4s]\n",
147 header.signature));
148 goto unlock_and_exit;
149 }
150 }
151 status = AE_NOT_FOUND;
152
153unlock_and_exit:
154 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
155 return_ACPI_STATUS(status);
156}