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tbfind.c revision 1.1.1.6 
      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 "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
     70 AcpiTbFindTable (
     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     memset (&Header, 0, sizeof (ACPI_TABLE_HEADER));
     87     ACPI_MOVE_NAME (Header.Signature, Signature);
     88     strncpy (Header.OemId, OemId, ACPI_OEM_ID_SIZE);
     89     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 (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 (!memcmp (AcpiGbl_RootTableList.Tables[i].Pointer->Signature,
    124                             Header.Signature, ACPI_NAME_SIZE) &&
    125             (!OemId[0] ||
    126              !memcmp (AcpiGbl_RootTableList.Tables[i].Pointer->OemId,
    127                              Header.OemId, ACPI_OEM_ID_SIZE)) &&
    128             (!OemTableId[0] ||
    129              !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