1 /******************************************************************************
2 *
3 * Module Name: tbfind - find table
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2016, 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.h"
45 #include "accommon.h"
46 #include "actables.h"
47
48 #define _COMPONENT ACPI_TABLES
49 ACPI_MODULE_NAME ("tbfind")
50
51
52 /*******************************************************************************
53 *
54 * FUNCTION: AcpiTbFindTable
55 *
56 * PARAMETERS: Signature - String with ACPI table signature
57 * OemId - String with the table OEM ID
58 * OemTableId - String with the OEM Table ID
59 * TableIndex - Where the table index is returned
60 *
61 * RETURN: Status and table index
62 *
63 * DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the
64 * Signature, OEM ID and OEM Table ID. Returns an index that can
65 * be used to get the table header or entire table.
66 *
67 ******************************************************************************/
68
69 ACPI_STATUS
AcpiTbFindTable(char * Signature,char * OemId,char * OemTableId,UINT32 * TableIndex)70 AcpiTbFindTable (
71 char *Signature,
72 char *OemId,
73 char *OemTableId,
74 UINT32 *TableIndex)
75 {
76 ACPI_STATUS Status;
77 ACPI_TABLE_HEADER Header;
78 UINT32 i;
79
80
81 ACPI_FUNCTION_TRACE (TbFindTable);
82
83
84 /* Validate the input table signature */
85
86 if (!AcpiUtValidNameseg (Signature))
87 {
88 return_ACPI_STATUS (AE_BAD_SIGNATURE);
89 }
90
91 /* Don't allow the OEM strings to be too long */
92
93 if ((strlen (OemId) > ACPI_OEM_ID_SIZE) ||
94 (strlen (OemTableId) > ACPI_OEM_TABLE_ID_SIZE))
95 {
96 return_ACPI_STATUS (AE_AML_STRING_LIMIT);
97 }
98
99 /* Normalize the input strings */
100
101 memset (&Header, 0, sizeof (ACPI_TABLE_HEADER));
102 ACPI_MOVE_NAME (Header.Signature, Signature);
103 strncpy (Header.OemId, OemId, ACPI_OEM_ID_SIZE);
104 strncpy (Header.OemTableId, OemTableId, ACPI_OEM_TABLE_ID_SIZE);
105
106 /* Search for the table */
107
108 for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; ++i)
109 {
110 if (memcmp (&(AcpiGbl_RootTableList.Tables[i].Signature),
111 Header.Signature, ACPI_NAME_SIZE))
112 {
113 /* Not the requested table */
114
115 continue;
116 }
117
118 /* Table with matching signature has been found */
119
120 if (!AcpiGbl_RootTableList.Tables[i].Pointer)
121 {
122 /* Table is not currently mapped, map it */
123
124 Status = AcpiTbValidateTable (&AcpiGbl_RootTableList.Tables[i]);
125 if (ACPI_FAILURE (Status))
126 {
127 return_ACPI_STATUS (Status);
128 }
129
130 if (!AcpiGbl_RootTableList.Tables[i].Pointer)
131 {
132 continue;
133 }
134 }
135
136 /* Check for table match on all IDs */
137
138 if (!memcmp (AcpiGbl_RootTableList.Tables[i].Pointer->Signature,
139 Header.Signature, ACPI_NAME_SIZE) &&
140 (!OemId[0] ||
141 !memcmp (AcpiGbl_RootTableList.Tables[i].Pointer->OemId,
142 Header.OemId, ACPI_OEM_ID_SIZE)) &&
143 (!OemTableId[0] ||
144 !memcmp (AcpiGbl_RootTableList.Tables[i].Pointer->OemTableId,
145 Header.OemTableId, ACPI_OEM_TABLE_ID_SIZE)))
146 {
147 *TableIndex = i;
148
149 ACPI_DEBUG_PRINT ((ACPI_DB_TABLES, "Found table [%4.4s]\n",
150 Header.Signature));
151 return_ACPI_STATUS (AE_OK);
152 }
153 }
154
155 return_ACPI_STATUS (AE_NOT_FOUND);
156 }
157