arch/all-pc/acpica/source/components/tables/tbfind.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbfind   - find table
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, 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 #define __TBFIND_C__
  45
  46 #include "acpi.h"
  47 #include "accommon.h"
  48 #include "actables.h"
  49
  50 #define _COMPONENT          ACPI_TABLES
  51         ACPI_MODULE_NAME    ("tbfind")
  52
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    AcpiTbFindTable
  57  *
  58  * PARAMETERS:  Signature           - String with ACPI table signature
  59  *              OemId               - String with the table OEM ID
  60  *              OemTableId          - String with the OEM Table ID
  61  *              TableIndex          - Where the table index is returned
  62  *
  63  * RETURN:      Status and table index
  64  *
  65  * DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the
  66  *              Signature, OEM ID and OEM Table ID. Returns an index that can
  67  *              be used to get the table header or entire table.
  68  *
  69  ******************************************************************************/
  70
  71 ACPI_STATUS
  72 AcpiTbFindTable (
  73     char                    *Signature,
  74     char                    *OemId,
  75     char                    *OemTableId,
  76     UINT32                  *TableIndex)
  77 {
  78     UINT32                  i;
  79     ACPI_STATUS             Status;
  80     ACPI_TABLE_HEADER       Header;
  81
  82
  83     ACPI_FUNCTION_TRACE (TbFindTable);
  84
  85
  86     /* Normalize the input strings */
  87
  88     ACPI_MEMSET (&Header, 0, sizeof (ACPI_TABLE_HEADER));
  89     ACPI_MOVE_NAME (Header.Signature, Signature);
  90     ACPI_STRNCPY (Header.OemId, OemId, ACPI_OEM_ID_SIZE);
  91     ACPI_STRNCPY (Header.OemTableId, OemTableId, ACPI_OEM_TABLE_ID_SIZE);
  92
  93     /* Search for the table */
  94
  95     for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; ++i)
  96     {
  97         if (ACPI_MEMCMP (&(AcpiGbl_RootTableList.Tables[i].Signature),
  98                             Header.Signature, ACPI_NAME_SIZE))
  99         {
 100             /* Not the requested table */
 101
 102             continue;
 103         }
 104
 105         /* Table with matching signature has been found */
 106
 107         if (!AcpiGbl_RootTableList.Tables[i].Pointer)
 108         {
 109             /* Table is not currently mapped, map it */
 110
 111             Status = AcpiTbVerifyTable (&AcpiGbl_RootTableList.Tables[i]);
 112             if (ACPI_FAILURE (Status))
 113             {
 114                 return_ACPI_STATUS (Status);
 115             }
 116
 117             if (!AcpiGbl_RootTableList.Tables[i].Pointer)
 118             {
 119                 continue;
 120             }
 121         }
 122
 123         /* Check for table match on all IDs */
 124
 125         if (!ACPI_MEMCMP (AcpiGbl_RootTableList.Tables[i].Pointer->Signature,
 126                             Header.Signature, ACPI_NAME_SIZE) &&
 127             (!OemId[0] ||
 128              !ACPI_MEMCMP (AcpiGbl_RootTableList.Tables[i].Pointer->OemId,
 129                              Header.OemId, ACPI_OEM_ID_SIZE)) &&
 130             (!OemTableId[0] ||
 131              !ACPI_MEMCMP (AcpiGbl_RootTableList.Tables[i].Pointer->OemTableId,
 132                              Header.OemTableId, ACPI_OEM_TABLE_ID_SIZE)))
 133         {
 134             *TableIndex = i;
 135
 136             ACPI_DEBUG_PRINT ((ACPI_DB_TABLES, "Found table [%4.4s]\n",
 137                 Header.Signature));
 138             return_ACPI_STATUS (AE_OK);
 139         }
 140     }
 141
 142     return_ACPI_STATUS (AE_NOT_FOUND);
 143 }