tbfind.c revision 281075 
1/******************************************************************************
2 *
3 * Module Name: tbfind   - find table
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2015, 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 <contrib/dev/acpica/include/acpi.h>
45#include <contrib/dev/acpica/include/accommon.h>
46#include <contrib/dev/acpica/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
69ACPI_STATUS
70AcpiTbFindTable (
71    char                    *Signature,
72    char                    *OemId,
73    char                    *OemTableId,
74    UINT32                  *TableIndex)
75{
76    UINT32                  i;
77    ACPI_STATUS             Status;
78    ACPI_TABLE_HEADER       Header;
79
80
81    ACPI_FUNCTION_TRACE (TbFindTable);
82
83
84    /* Normalize the input strings */
85
86    ACPI_MEMSET (&Header, 0, sizeof (ACPI_TABLE_HEADER));
87    ACPI_MOVE_NAME (Header.Signature, Signature);
88    ACPI_STRNCPY (Header.OemId, OemId, ACPI_OEM_ID_SIZE);
89    ACPI_STRNCPY (Header.OemTableId, OemTableId, ACPI_OEM_TABLE_ID_SIZE);
90
91    /* Search for the table */
92
93    for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; ++i)
94    {
95        if (ACPI_MEMCMP (&(AcpiGbl_RootTableList.Tables[i].Signature),
96                            Header.Signature, ACPI_NAME_SIZE))
97        {
98            /* Not the requested table */
99
100            continue;
101        }
102
103        /* Table with matching signature has been found */
104
105        if (!AcpiGbl_RootTableList.Tables[i].Pointer)
106        {
107            /* Table is not currently mapped, map it */
108
109            Status = AcpiTbValidateTable (&AcpiGbl_RootTableList.Tables[i]);
110            if (ACPI_FAILURE (Status))
111            {
112                return_ACPI_STATUS (Status);
113            }
114
115            if (!AcpiGbl_RootTableList.Tables[i].Pointer)
116            {
117                continue;
118            }
119        }
120
121        /* Check for table match on all IDs */
122
123        if (!ACPI_MEMCMP (AcpiGbl_RootTableList.Tables[i].Pointer->Signature,
124                            Header.Signature, ACPI_NAME_SIZE) &&
125            (!OemId[0] ||
126             !ACPI_MEMCMP (AcpiGbl_RootTableList.Tables[i].Pointer->OemId,
127                             Header.OemId, ACPI_OEM_ID_SIZE)) &&
128            (!OemTableId[0] ||
129             !ACPI_MEMCMP (AcpiGbl_RootTableList.Tables[i].Pointer->OemTableId,
130                             Header.OemTableId, ACPI_OEM_TABLE_ID_SIZE)))
131        {
132            *TableIndex = i;
133
134            ACPI_DEBUG_PRINT ((ACPI_DB_TABLES, "Found table [%4.4s]\n",
135                Header.Signature));
136            return_ACPI_STATUS (AE_OK);
137        }
138    }
139
140    return_ACPI_STATUS (AE_NOT_FOUND);
141}
142