FreeBSD/Linux Kernel Cross Reference
sys/contrib/dev/acpica/components/tables/tbxface.c

     /******************************************************************************
      *
      * Module Name: tbxface - ACPI table-oriented external interfaces
      *
      *****************************************************************************/
     
     /******************************************************************************
      *
      * 1. Copyright Notice
     *
     * Some or all of this work - Copyright (c) 1999 - 2022, Intel Corp.
     * All rights reserved.
     *
     * 2. License
     *
     * 2.1. This is your license from Intel Corp. under its intellectual property
     * rights. You may have additional license terms from the party that provided
     * you this software, covering your right to use that party's intellectual
     * property rights.
     *
     * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
     * copy of the source code appearing in this file ("Covered Code") an
     * irrevocable, perpetual, worldwide license under Intel's copyrights in the
     * base code distributed originally by Intel ("Original Intel Code") to copy,
     * make derivatives, distribute, use and display any portion of the Covered
     * Code in any form, with the right to sublicense such rights; and
     *
     * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
     * license (with the right to sublicense), under only those claims of Intel
     * patents that are infringed by the Original Intel Code, to make, use, sell,
     * offer to sell, and import the Covered Code and derivative works thereof
     * solely to the minimum extent necessary to exercise the above copyright
     * license, and in no event shall the patent license extend to any additions
     * to or modifications of the Original Intel Code. No other license or right
     * is granted directly or by implication, estoppel or otherwise;
     *
     * The above copyright and patent license is granted only if the following
     * conditions are met:
     *
     * 3. Conditions
     *
     * 3.1. Redistribution of Source with Rights to Further Distribute Source.
     * Redistribution of source code of any substantial portion of the Covered
     * Code or modification with rights to further distribute source must include
     * the above Copyright Notice, the above License, this list of Conditions,
     * and the following Disclaimer and Export Compliance provision. In addition,
     * Licensee must cause all Covered Code to which Licensee contributes to
     * contain a file documenting the changes Licensee made to create that Covered
     * Code and the date of any change. Licensee must include in that file the
     * documentation of any changes made by any predecessor Licensee. Licensee
     * must include a prominent statement that the modification is derived,
     * directly or indirectly, from Original Intel Code.
     *
     * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
     * Redistribution of source code of any substantial portion of the Covered
     * Code or modification without rights to further distribute source must
     * include the following Disclaimer and Export Compliance provision in the
     * documentation and/or other materials provided with distribution. In
     * addition, Licensee may not authorize further sublicense of source of any
     * portion of the Covered Code, and must include terms to the effect that the
     * license from Licensee to its licensee is limited to the intellectual
     * property embodied in the software Licensee provides to its licensee, and
     * not to intellectual property embodied in modifications its licensee may
     * make.
     *
     * 3.3. Redistribution of Executable. Redistribution in executable form of any
     * substantial portion of the Covered Code or modification must reproduce the
     * above Copyright Notice, and the following Disclaimer and Export Compliance
     * provision in the documentation and/or other materials provided with the
     * distribution.
     *
     * 3.4. Intel retains all right, title, and interest in and to the Original
     * Intel Code.
     *
     * 3.5. Neither the name Intel nor any other trademark owned or controlled by
     * Intel shall be used in advertising or otherwise to promote the sale, use or
     * other dealings in products derived from or relating to the Covered Code
     * without prior written authorization from Intel.
     *
     * 4. Disclaimer and Export Compliance
     *
     * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
     * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
     * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
     * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
     * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
     * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
     * PARTICULAR PURPOSE.
     *
     * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
     * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
     * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
     * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
     * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
     * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
     * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
     * LIMITED REMEDY.
     *
     * 4.3. Licensee shall not export, either directly or indirectly, any of this
    * software or system incorporating such software without first obtaining any
    * required license or other approval from the U. S. Department of Commerce or
    * any other agency or department of the United States Government. In the
    * event Licensee exports any such software from the United States or
    * re-exports any such software from a foreign destination, Licensee shall
    * ensure that the distribution and export/re-export of the software is in
    * compliance with all laws, regulations, orders, or other restrictions of the
    * U.S. Export Administration Regulations. Licensee agrees that neither it nor
    * any of its subsidiaries will export/re-export any technical data, process,
    * software, or service, directly or indirectly, to any country for which the
    * United States government or any agency thereof requires an export license,
    * other governmental approval, or letter of assurance, without first obtaining
    * such license, approval or letter.
    *
    *****************************************************************************
    *
    * Alternatively, you may choose to be licensed under the terms of the
    * following license:
    *
    * Redistribution and use in source and binary forms, with or without
    * modification, are permitted provided that the following conditions
    * are met:
    * 1. Redistributions of source code must retain the above copyright
    *    notice, this list of conditions, and the following disclaimer,
    *    without modification.
    * 2. Redistributions in binary form must reproduce at minimum a disclaimer
    *    substantially similar to the "NO WARRANTY" disclaimer below
    *    ("Disclaimer") and any redistribution must be conditioned upon
    *    including a substantially similar Disclaimer requirement for further
    *    binary redistribution.
    * 3. Neither the names of the above-listed copyright holders nor the names
    *    of any contributors may be used to endorse or promote products derived
    *    from this software without specific prior written permission.
    *
    * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    *
    * Alternatively, you may choose to be licensed under the terms of the
    * GNU General Public License ("GPL") version 2 as published by the Free
    * Software Foundation.
    *
    *****************************************************************************/
   
   #define EXPORT_ACPI_INTERFACES
   
   #include <contrib/dev/acpica/include/acpi.h>
   #include <contrib/dev/acpica/include/accommon.h>
   #include <contrib/dev/acpica/include/actables.h>
   
   #define _COMPONENT          ACPI_TABLES
           ACPI_MODULE_NAME    ("tbxface")
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiAllocateRootTable
    *
    * PARAMETERS:  InitialTableCount   - Size of InitialTableArray, in number of
    *                                    ACPI_TABLE_DESC structures
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Allocate a root table array. Used by iASL compiler and
    *              AcpiInitializeTables.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiAllocateRootTable (
       UINT32                  InitialTableCount)
   {
   
       AcpiGbl_RootTableList.MaxTableCount = InitialTableCount;
       AcpiGbl_RootTableList.Flags = ACPI_ROOT_ALLOW_RESIZE;
   
       return (AcpiTbResizeRootTableList ());
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiInitializeTables
    *
    * PARAMETERS:  InitialTableArray   - Pointer to an array of pre-allocated
    *                                    ACPI_TABLE_DESC structures. If NULL, the
    *                                    array is dynamically allocated.
    *              InitialTableCount   - Size of InitialTableArray, in number of
    *                                    ACPI_TABLE_DESC structures
    *              AllowResize         - Flag to tell Table Manager if resize of
    *                                    pre-allocated array is allowed. Ignored
    *                                    if InitialTableArray is NULL.
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
    *
    * NOTE:        Allows static allocation of the initial table array in order
    *              to avoid the use of dynamic memory in confined environments
    *              such as the kernel boot sequence where it may not be available.
    *
    *              If the host OS memory managers are initialized, use NULL for
    *              InitialTableArray, and the table will be dynamically allocated.
    *
    ******************************************************************************/
   
   ACPI_STATUS ACPI_INIT_FUNCTION
   AcpiInitializeTables (
       ACPI_TABLE_DESC         *InitialTableArray,
       UINT32                  InitialTableCount,
       BOOLEAN                 AllowResize)
   {
       ACPI_PHYSICAL_ADDRESS   RsdpAddress;
       ACPI_STATUS             Status;
   
   
       ACPI_FUNCTION_TRACE (AcpiInitializeTables);
   
   
       /*
        * Setup the Root Table Array and allocate the table array
        * if requested
        */
       if (!InitialTableArray)
       {
           Status = AcpiAllocateRootTable (InitialTableCount);
           if (ACPI_FAILURE (Status))
           {
               return_ACPI_STATUS (Status);
           }
       }
       else
       {
           /* Root Table Array has been statically allocated by the host */
   
           memset (InitialTableArray, 0,
               (ACPI_SIZE) InitialTableCount * sizeof (ACPI_TABLE_DESC));
   
           AcpiGbl_RootTableList.Tables = InitialTableArray;
           AcpiGbl_RootTableList.MaxTableCount = InitialTableCount;
           AcpiGbl_RootTableList.Flags = ACPI_ROOT_ORIGIN_UNKNOWN;
           if (AllowResize)
           {
               AcpiGbl_RootTableList.Flags |= ACPI_ROOT_ALLOW_RESIZE;
           }
       }
   
       /* Get the address of the RSDP */
   
       RsdpAddress = AcpiOsGetRootPointer ();
       if (!RsdpAddress)
       {
           return_ACPI_STATUS (AE_NOT_FOUND);
       }
   
       /*
        * Get the root table (RSDT or XSDT) and extract all entries to the local
        * Root Table Array. This array contains the information of the RSDT/XSDT
        * in a common, more usable format.
        */
       Status = AcpiTbParseRootTable (RsdpAddress);
       return_ACPI_STATUS (Status);
   }
   
   ACPI_EXPORT_SYMBOL_INIT (AcpiInitializeTables)
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiReallocateRootTable
    *
    * PARAMETERS:  None
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
    *              root list from the previously provided scratch area. Should
    *              be called once dynamic memory allocation is available in the
    *              kernel.
    *
    ******************************************************************************/
   
   ACPI_STATUS ACPI_INIT_FUNCTION
   AcpiReallocateRootTable (
       void)
   {
       ACPI_STATUS             Status;
       ACPI_TABLE_DESC         *TableDesc;
       UINT32                  i, j;
   
   
       ACPI_FUNCTION_TRACE (AcpiReallocateRootTable);
   
   
       /*
        * If there are tables unverified, it is required to reallocate the
        * root table list to clean up invalid table entries. Otherwise only
        * reallocate the root table list if the host provided a static buffer
        * for the table array in the call to AcpiInitializeTables().
        */
       if ((AcpiGbl_RootTableList.Flags & ACPI_ROOT_ORIGIN_ALLOCATED) &&
           AcpiGbl_EnableTableValidation)
       {
           return_ACPI_STATUS (AE_SUPPORT);
       }
   
       (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
   
       /*
        * Ensure OS early boot logic, which is required by some hosts. If the
        * table state is reported to be wrong, developers should fix the
        * issue by invoking AcpiPutTable() for the reported table during the
        * early stage.
        */
       for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; ++i)
       {
           TableDesc = &AcpiGbl_RootTableList.Tables[i];
           if (TableDesc->Pointer)
           {
               ACPI_ERROR ((AE_INFO,
                   "Table [%4.4s] is not invalidated during early boot stage",
                   TableDesc->Signature.Ascii));
           }
       }
   
       if (!AcpiGbl_EnableTableValidation)
       {
           /*
            * Now it's safe to do full table validation. We can do deferred
            * table initialization here once the flag is set.
            */
           AcpiGbl_EnableTableValidation = TRUE;
           for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; ++i)
           {
               TableDesc = &AcpiGbl_RootTableList.Tables[i];
               if (!(TableDesc->Flags & ACPI_TABLE_IS_VERIFIED))
               {
                   Status = AcpiTbVerifyTempTable (TableDesc, NULL, &j);
                   if (ACPI_FAILURE (Status))
                   {
                       AcpiTbUninstallTable (TableDesc);
                   }
               }
           }
       }
   
       AcpiGbl_RootTableList.Flags |= ACPI_ROOT_ALLOW_RESIZE;
       Status = AcpiTbResizeRootTableList ();
       AcpiGbl_RootTableList.Flags |= ACPI_ROOT_ORIGIN_ALLOCATED;
   
       (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
       return_ACPI_STATUS (Status);
   }
   
   ACPI_EXPORT_SYMBOL_INIT (AcpiReallocateRootTable)
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiGetTableHeader
    *
    * PARAMETERS:  Signature           - ACPI signature of needed table
    *              Instance            - Which instance (for SSDTs)
    *              OutTableHeader      - The pointer to the where the table header
    *                                    is returned
    *
    * RETURN:      Status and a copy of the table header
    *
    * DESCRIPTION: Finds and returns an ACPI table header. Caller provides the
    *              memory where a copy of the header is to be returned
    *              (fixed length).
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiGetTableHeader (
       char                    *Signature,
       UINT32                  Instance,
       ACPI_TABLE_HEADER       *OutTableHeader)
   {
       UINT32                  i;
       UINT32                  j;
       ACPI_TABLE_HEADER       *Header;
   
   
       /* Parameter validation */
   
       if (!Signature || !OutTableHeader)
       {
           return (AE_BAD_PARAMETER);
       }
   
       /* Walk the root table list */
   
       for (i = 0, j = 0; i < AcpiGbl_RootTableList.CurrentTableCount; i++)
       {
           if (!ACPI_COMPARE_NAMESEG (
                   &(AcpiGbl_RootTableList.Tables[i].Signature), Signature))
           {
               continue;
           }
   
           if (++j < Instance)
           {
               continue;
           }
   
           if (!AcpiGbl_RootTableList.Tables[i].Pointer)
           {
               if ((AcpiGbl_RootTableList.Tables[i].Flags &
                       ACPI_TABLE_ORIGIN_MASK) ==
                   ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL)
               {
                   Header = AcpiOsMapMemory (
                       AcpiGbl_RootTableList.Tables[i].Address,
                       sizeof (ACPI_TABLE_HEADER));
                   if (!Header)
                   {
                       return (AE_NO_MEMORY);
                   }
   
                   memcpy (OutTableHeader, Header, sizeof (ACPI_TABLE_HEADER));
                   AcpiOsUnmapMemory (Header, sizeof (ACPI_TABLE_HEADER));
               }
               else
               {
                   return (AE_NOT_FOUND);
               }
           }
           else
           {
               memcpy (OutTableHeader,
                   AcpiGbl_RootTableList.Tables[i].Pointer,
                   sizeof (ACPI_TABLE_HEADER));
           }
   
           return (AE_OK);
       }
   
       return (AE_NOT_FOUND);
   }
   
   ACPI_EXPORT_SYMBOL (AcpiGetTableHeader)
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiGetTable
    *
    * PARAMETERS:  Signature           - ACPI signature of needed table
    *              Instance            - Which instance (for SSDTs)
    *              OutTable            - Where the pointer to the table is returned
    *
    * RETURN:      Status and pointer to the requested table
    *
    * DESCRIPTION: Finds and verifies an ACPI table. Table must be in the
    *              RSDT/XSDT.
    *              Note that an early stage AcpiGetTable() call must be paired
    *              with an early stage AcpiPutTable() call. otherwise the table
    *              pointer mapped by the early stage mapping implementation may be
    *              erroneously unmapped by the late stage unmapping implementation
    *              in an AcpiPutTable() invoked during the late stage.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiGetTable (
       char                    *Signature,
       UINT32                  Instance,
       ACPI_TABLE_HEADER       **OutTable)
   {
       UINT32                  i;
       UINT32                  j;
       ACPI_STATUS             Status = AE_NOT_FOUND;
       ACPI_TABLE_DESC         *TableDesc;
   
   
       /* Parameter validation */
   
       if (!Signature || !OutTable)
       {
           return (AE_BAD_PARAMETER);
       }
   
       /*
        * Note that the following line is required by some OSPMs, they only
        * check if the returned table is NULL instead of the returned status
        * to determined if this function is succeeded.
        */
       *OutTable = NULL;
   
       (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
   
       /* Walk the root table list */
   
       for (i = 0, j = 0; i < AcpiGbl_RootTableList.CurrentTableCount; i++)
       {
           TableDesc = &AcpiGbl_RootTableList.Tables[i];
   
           if (!ACPI_COMPARE_NAMESEG (&TableDesc->Signature, Signature))
           {
               continue;
           }
   
           if (++j < Instance)
           {
               continue;
           }
   
           Status = AcpiTbGetTable (TableDesc, OutTable);
           break;
       }
   
       (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
       return (Status);
   }
   
   ACPI_EXPORT_SYMBOL (AcpiGetTable)
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiPutTable
    *
    * PARAMETERS:  Table               - The pointer to the table
    *
    * RETURN:      None
    *
    * DESCRIPTION: Release a table returned by AcpiGetTable() and its clones.
    *              Note that it is not safe if this function was invoked after an
    *              uninstallation happened to the original table descriptor.
    *              Currently there is no OSPMs' requirement to handle such
    *              situations.
    *
    ******************************************************************************/
   
   void
   AcpiPutTable (
       ACPI_TABLE_HEADER       *Table)
   {
       UINT32                  i;
       ACPI_TABLE_DESC         *TableDesc;
   
   
       ACPI_FUNCTION_TRACE (AcpiPutTable);
   
   
       if (!Table)
       {
           return_VOID;
       }
   
       (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
   
       /* Walk the root table list */
   
       for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; i++)
       {
           TableDesc = &AcpiGbl_RootTableList.Tables[i];
   
           if (TableDesc->Pointer != Table)
           {
               continue;
           }
   
           AcpiTbPutTable (TableDesc);
           break;
       }
   
       (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
       return_VOID;
   }
   
   ACPI_EXPORT_SYMBOL (AcpiPutTable)
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiGetTableByIndex
    *
    * PARAMETERS:  TableIndex          - Table index
    *              OutTable            - Where the pointer to the table is returned
    *
    * RETURN:      Status and pointer to the requested table
    *
    * DESCRIPTION: Obtain a table by an index into the global table list. Used
    *              internally also.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiGetTableByIndex (
       UINT32                  TableIndex,
       ACPI_TABLE_HEADER       **OutTable)
   {
       ACPI_STATUS             Status;
   
   
       ACPI_FUNCTION_TRACE (AcpiGetTableByIndex);
   
   
       /* Parameter validation */
   
       if (!OutTable)
       {
           return_ACPI_STATUS (AE_BAD_PARAMETER);
       }
   
       /*
        * Note that the following line is required by some OSPMs, they only
        * check if the returned table is NULL instead of the returned status
        * to determined if this function is succeeded.
        */
       *OutTable = NULL;
   
       (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
   
       /* Validate index */
   
       if (TableIndex >= AcpiGbl_RootTableList.CurrentTableCount)
       {
           Status = AE_BAD_PARAMETER;
           goto UnlockAndExit;
       }
   
       Status = AcpiTbGetTable (
           &AcpiGbl_RootTableList.Tables[TableIndex], OutTable);
   
   UnlockAndExit:
       (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
       return_ACPI_STATUS (Status);
   }
   
   ACPI_EXPORT_SYMBOL (AcpiGetTableByIndex)
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiInstallTableHandler
    *
    * PARAMETERS:  Handler         - Table event handler
    *              Context         - Value passed to the handler on each event
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Install a global table event handler.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiInstallTableHandler (
       ACPI_TABLE_HANDLER      Handler,
       void                    *Context)
   {
       ACPI_STATUS             Status;
   
   
       ACPI_FUNCTION_TRACE (AcpiInstallTableHandler);
   
   
       if (!Handler)
       {
           return_ACPI_STATUS (AE_BAD_PARAMETER);
       }
   
       Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
       if (ACPI_FAILURE (Status))
       {
           return_ACPI_STATUS (Status);
       }
   
       /* Don't allow more than one handler */
   
       if (AcpiGbl_TableHandler)
       {
           Status = AE_ALREADY_EXISTS;
           goto Cleanup;
       }
   
       /* Install the handler */
   
       AcpiGbl_TableHandler = Handler;
       AcpiGbl_TableHandlerContext = Context;
   
   Cleanup:
       (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
       return_ACPI_STATUS (Status);
   }
   
   ACPI_EXPORT_SYMBOL (AcpiInstallTableHandler)
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiRemoveTableHandler
    *
    * PARAMETERS:  Handler         - Table event handler that was installed
    *                                previously.
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Remove a table event handler
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiRemoveTableHandler (
       ACPI_TABLE_HANDLER      Handler)
   {
       ACPI_STATUS             Status;
   
   
       ACPI_FUNCTION_TRACE (AcpiRemoveTableHandler);
   
   
       Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS);
       if (ACPI_FAILURE (Status))
       {
           return_ACPI_STATUS (Status);
       }
   
       /* Make sure that the installed handler is the same */
   
       if (!Handler ||
           Handler != AcpiGbl_TableHandler)
       {
           Status = AE_BAD_PARAMETER;
           goto Cleanup;
       }
   
       /* Remove the handler */
   
       AcpiGbl_TableHandler = NULL;
   
   Cleanup:
       (void) AcpiUtReleaseMutex (ACPI_MTX_EVENTS);
       return_ACPI_STATUS (Status);
   }
   
   ACPI_EXPORT_SYMBOL (AcpiRemoveTableHandler)

Cache object: ec4b0cfe3b372ba51e4117145c58f9ad