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 /******************************************************************************
  *
  * Module Name: tbxface - ACPI table-oriented external interfaces
  *
  *****************************************************************************/
 
 /******************************************************************************
  *
  * 1. Copyright Notice
  *
  * Some or all of this work - Copyright (c) 1999 - 2024, 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 "acpi.h"
 #include "accommon.h"
 #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)

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