drivers/acpica/tbfind.c

0001 /******************************************************************************
0002  *
0003  * Module Name: tbfind   - find table
0004  *
0005  *****************************************************************************/
0006
0007 /******************************************************************************
0008  *
0009  * 1. Copyright Notice
0010  *
0011  * Some or all of this work - Copyright (c) 1999 - 2009, Intel Corp.
0012  * All rights reserved.
0013  *
0014  * 2. License
0015  *
0016  * 2.1. This is your license from Intel Corp. under its intellectual property
0017  * rights.  You may have additional license terms from the party that provided
0018  * you this software, covering your right to use that party's intellectual
0019  * property rights.
0020  *
0021  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
0022  * copy of the source code appearing in this file ("Covered Code") an
0023  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
0024  * base code distributed originally by Intel ("Original Intel Code") to copy,
0025  * make derivatives, distribute, use and display any portion of the Covered
0026  * Code in any form, with the right to sublicense such rights; and
0027  *
0028  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
0029  * license (with the right to sublicense), under only those claims of Intel
0030  * patents that are infringed by the Original Intel Code, to make, use, sell,
0031  * offer to sell, and import the Covered Code and derivative works thereof
0032  * solely to the minimum extent necessary to exercise the above copyright
0033  * license, and in no event shall the patent license extend to any additions
0034  * to or modifications of the Original Intel Code.  No other license or right
0035  * is granted directly or by implication, estoppel or otherwise;
0036  *
0037  * The above copyright and patent license is granted only if the following
0038  * conditions are met:
0039  *
0040  * 3. Conditions
0041  *
0042  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
0043  * Redistribution of source code of any substantial portion of the Covered
0044  * Code or modification with rights to further distribute source must include
0045  * the above Copyright Notice, the above License, this list of Conditions,
0046  * and the following Disclaimer and Export Compliance provision.  In addition,
0047  * Licensee must cause all Covered Code to which Licensee contributes to
0048  * contain a file documenting the changes Licensee made to create that Covered
0049  * Code and the date of any change.  Licensee must include in that file the
0050  * documentation of any changes made by any predecessor Licensee.  Licensee
0051  * must include a prominent statement that the modification is derived,
0052  * directly or indirectly, from Original Intel Code.
0053  *
0054  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
0055  * Redistribution of source code of any substantial portion of the Covered
0056  * Code or modification without rights to further distribute source must
0057  * include the following Disclaimer and Export Compliance provision in the
0058  * documentation and/or other materials provided with distribution.  In
0059  * addition, Licensee may not authorize further sublicense of source of any
0060  * portion of the Covered Code, and must include terms to the effect that the
0061  * license from Licensee to its licensee is limited to the intellectual
0062  * property embodied in the software Licensee provides to its licensee, and
0063  * not to intellectual property embodied in modifications its licensee may
0064  * make.
0065  *
0066  * 3.3. Redistribution of Executable. Redistribution in executable form of any
0067  * substantial portion of the Covered Code or modification must reproduce the
0068  * above Copyright Notice, and the following Disclaimer and Export Compliance
0069  * provision in the documentation and/or other materials provided with the
0070  * distribution.
0071  *
0072  * 3.4. Intel retains all right, title, and interest in and to the Original
0073  * Intel Code.
0074  *
0075  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
0076  * Intel shall be used in advertising or otherwise to promote the sale, use or
0077  * other dealings in products derived from or relating to the Covered Code
0078  * without prior written authorization from Intel.
0079  *
0080  * 4. Disclaimer and Export Compliance
0081  *
0082  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
0083  * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
0084  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
0085  * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
0086  * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
0087  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
0088  * PARTICULAR PURPOSE.
0089  *
0090  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
0091  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
0092  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
0093  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
0094  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
0095  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
0096  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
0097  * LIMITED REMEDY.
0098  *
0099  * 4.3. Licensee shall not export, either directly or indirectly, any of this
0100  * software or system incorporating such software without first obtaining any
0101  * required license or other approval from the U. S. Department of Commerce or
0102  * any other agency or department of the United States Government.  In the
0103  * event Licensee exports any such software from the United States or
0104  * re-exports any such software from a foreign destination, Licensee shall
0105  * ensure that the distribution and export/re-export of the software is in
0106  * compliance with all laws, regulations, orders, or other restrictions of the
0107  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
0108  * any of its subsidiaries will export/re-export any technical data, process,
0109  * software, or service, directly or indirectly, to any country for which the
0110  * United States government or any agency thereof requires an export license,
0111  * other governmental approval, or letter of assurance, without first obtaining
0112  * such license, approval or letter.
0113  *
0114  *****************************************************************************/
0115
0116 #define __TBFIND_C__
0117
0118 #include "acpi.h"
0119 #include "accommon.h"
0120 #include "actables.h"
0121
0122 #define _COMPONENT          ACPI_TABLES
0123         ACPI_MODULE_NAME    ("tbfind")
0124
0125
0126 /*******************************************************************************
0127  *
0128  * FUNCTION:    AcpiTbFindTable
0129  *
0130  * PARAMETERS:  Signature           - String with ACPI table signature
0131  *              OemId               - String with the table OEM ID
0132  *              OemTableId          - String with the OEM Table ID
0133  *              TableIndex          - Where the table index is returned
0134  *
0135  * RETURN:      Status and table index
0136  *
0137  * DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the
0138  *              Signature, OEM ID and OEM Table ID. Returns an index that can
0139  *              be used to get the table header or entire table.
0140  *
0141  ******************************************************************************/
0142
0143 ACPI_STATUS
0144 AcpiTbFindTable (
0145     char                    *Signature,
0146     char                    *OemId,
0147     char                    *OemTableId,
0148     UINT32                  *TableIndex)
0149 {
0150     UINT32                  i;
0151     ACPI_STATUS             Status;
0152     ACPI_TABLE_HEADER       Header;
0153
0154
0155     ACPI_FUNCTION_TRACE (TbFindTable);
0156
0157
0158     /* Normalize the input strings */
0159
0160     ACPI_MEMSET (&Header, 0, sizeof (ACPI_TABLE_HEADER));
0161     ACPI_STRNCPY (Header.Signature, Signature, ACPI_NAME_SIZE);
0162     ACPI_STRNCPY (Header.OemId, OemId, ACPI_OEM_ID_SIZE);
0163     ACPI_STRNCPY (Header.OemTableId, OemTableId, ACPI_OEM_TABLE_ID_SIZE);
0164
0165     /* Search for the table */
0166
0167     for (i = 0; i < AcpiGbl_RootTableList.Count; ++i)
0168     {
0169         if (ACPI_MEMCMP (&(AcpiGbl_RootTableList.Tables[i].Signature),
0170                             Header.Signature, ACPI_NAME_SIZE))
0171         {
0172             /* Not the requested table */
0173
0174             continue;
0175         }
0176
0177         /* Table with matching signature has been found */
0178
0179         if (!AcpiGbl_RootTableList.Tables[i].Pointer)
0180         {
0181             /* Table is not currently mapped, map it */
0182
0183             Status = AcpiTbVerifyTable (&AcpiGbl_RootTableList.Tables[i]);
0184             if (ACPI_FAILURE (Status))
0185             {
0186                 return_ACPI_STATUS (Status);
0187             }
0188
0189             if (!AcpiGbl_RootTableList.Tables[i].Pointer)
0190             {
0191                 continue;
0192             }
0193         }
0194
0195         /* Check for table match on all IDs */
0196
0197         if (!ACPI_MEMCMP (AcpiGbl_RootTableList.Tables[i].Pointer->Signature,
0198                             Header.Signature, ACPI_NAME_SIZE) &&
0199             (!OemId[0] ||
0200              !ACPI_MEMCMP (AcpiGbl_RootTableList.Tables[i].Pointer->OemId,
0201                              Header.OemId, ACPI_OEM_ID_SIZE)) &&
0202             (!OemTableId[0] ||
0203              !ACPI_MEMCMP (AcpiGbl_RootTableList.Tables[i].Pointer->OemTableId,
0204                              Header.OemTableId, ACPI_OEM_TABLE_ID_SIZE)))
0205         {
0206             *TableIndex = i;
0207
0208             ACPI_DEBUG_PRINT ((ACPI_DB_TABLES, "Found table [%4.4s]\n",
0209                 Header.Signature));
0210             return_ACPI_STATUS (AE_OK);
0211         }
0212     }
0213
0214     return_ACPI_STATUS (AE_NOT_FOUND);
0215 }