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/******************************************************************************

 *

 * Module Name: tbxface - Public interfaces to the ACPI subsystem

 *                         ACPI table oriented interfaces

 *

 *****************************************************************************/

/******************************************************************************

 *

 * 1. Copyright Notice

 *

 * Some or all of this work - Copyright (c) 1999 - 2011, 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.

 *

 *****************************************************************************/

#define __TBXFACE_C__

#include "acpi.h"

#include "accommon.h"

#include "acnamesp.h"

#include "actables.h"

#define _COMPONENT          ACPI_TABLES

        ACPI_MODULE_NAME    ("tbxface")

/* Local prototypes */

static ACPI_STATUS

AcpiTbLoadNamespace (

    void);

/*******************************************************************************

 *

 * 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

 *              AllowRealloc        - 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

AcpiInitializeTables (

    ACPI_TABLE_DESC         *InitialTableArray,

    UINT32                  InitialTableCount,

    BOOLEAN                 AllowResize)

{

    ACPI_PHYSICAL_ADDRESS   RsdpAddress;

    ACPI_STATUS             Status;

    ACPI_FUNCTION_TRACE (AcpiInitializeTables);

    /*

     * Set up the Root Table Array

     * 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 */

        ACPI_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 useable format.

     */

    Status = AcpiTbParseRootTable (RsdpAddress);

    return_ACPI_STATUS (Status);

}

ACPI_EXPORT_SYMBOL (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

AcpiReallocateRootTable (

    void)

{

    ACPI_TABLE_DESC         *Tables;

    ACPI_SIZE               NewSize;

    ACPI_SIZE               CurrentSize;

    ACPI_FUNCTION_TRACE (AcpiReallocateRootTable);

    /*

     * Only reallocate the root table if the host provided a static buffer

     * for the table array in the call to AcpiInitializeTables.

     */

    if (AcpiGbl_RootTableList.Flags & ACPI_ROOT_ORIGIN_ALLOCATED)

    {

        return_ACPI_STATUS (AE_SUPPORT);

    }

    /*

     * Get the current size of the root table and add the default

     * increment to create the new table size.

     */

    CurrentSize = (ACPI_SIZE)

        AcpiGbl_RootTableList.CurrentTableCount * sizeof (ACPI_TABLE_DESC);

    NewSize = CurrentSize +

        (ACPI_ROOT_TABLE_SIZE_INCREMENT * sizeof (ACPI_TABLE_DESC));

    /* Create new array and copy the old array */

    Tables = ACPI_ALLOCATE_ZEROED (NewSize);

    if (!Tables)

    {

        return_ACPI_STATUS (AE_NO_MEMORY);

    }

    ACPI_MEMCPY (Tables, AcpiGbl_RootTableList.Tables, CurrentSize);

    /*

     * Update the root table descriptor. The new size will be the current

     * number of tables plus the increment, independent of the reserved

     * size of the original table list.

     */

    AcpiGbl_RootTableList.Tables = Tables;

    AcpiGbl_RootTableList.MaxTableCount =

        AcpiGbl_RootTableList.CurrentTableCount + ACPI_ROOT_TABLE_SIZE_INCREMENT;

    AcpiGbl_RootTableList.Flags =

        ACPI_ROOT_ORIGIN_ALLOCATED | ACPI_ROOT_ALLOW_RESIZE;

    return_ACPI_STATUS (AE_OK);

}

ACPI_EXPORT_SYMBOL (AcpiReallocateRootTable)

/*******************************************************************************

 *

 * FUNCTION:    AcpiGetTableHeader

 *

 * PARAMETERS:  Signature           - ACPI signature of needed table

 *              Instance            - Which instance (for SSDTs)

 *              OutTableHeader      - The pointer to the table header to fill

 *

 * RETURN:      Status and pointer to mapped table header

 *

 * DESCRIPTION: Finds an ACPI table header.

 *

 * NOTE:        Caller is responsible in unmapping the header with

 *              AcpiOsUnmapMemory

 *

 ******************************************************************************/

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_NAME (&(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_MAPPED)

            {

                Header = AcpiOsMapMemory (

                            AcpiGbl_RootTableList.Tables[i].Address,

                            sizeof (ACPI_TABLE_HEADER));

                if (!Header)

                {

                    return AE_NO_MEMORY;

                }

                ACPI_MEMCPY (OutTableHeader, Header, sizeof(ACPI_TABLE_HEADER));

                AcpiOsUnmapMemory (Header, sizeof(ACPI_TABLE_HEADER));

            }

            else

            {

                return AE_NOT_FOUND;

            }

        }

        else

        {

            ACPI_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 table

 *

 * DESCRIPTION: Finds and verifies an ACPI table.

 *

 ******************************************************************************/

ACPI_STATUS

AcpiGetTable (

    char                    *Signature,

    UINT32                  Instance,

    ACPI_TABLE_HEADER       **OutTable)

{

    UINT32                  i;

    UINT32                  j;

    ACPI_STATUS             Status;

    /* Parameter validation */

    if (!Signature || !OutTable)

    {

        return (AE_BAD_PARAMETER);

    }

    /* Walk the root table list */

    for (i = 0, j = 0; i < AcpiGbl_RootTableList.CurrentTableCount; i++)

    {

        if (!ACPI_COMPARE_NAME (&(AcpiGbl_RootTableList.Tables[i].Signature),

                Signature))

        {

            continue;

        }

        if (++j < Instance)

        {

            continue;

        }

        Status = AcpiTbVerifyTable (&AcpiGbl_RootTableList.Tables[i]);

        if (ACPI_SUCCESS (Status))

        {

            *OutTable = AcpiGbl_RootTableList.Tables[i].Pointer;

        }

        return (Status);

    }

    return (AE_NOT_FOUND);

}

ACPI_EXPORT_SYMBOL (AcpiGetTable)

/*******************************************************************************

 *

 * FUNCTION:    AcpiGetTableByIndex

 *

 * PARAMETERS:  TableIndex          - Table index

 *              Table               - Where the pointer to the table is returned

 *

 * RETURN:      Status and pointer to the table

 *

 * DESCRIPTION: Obtain a table by an index into the global table list.

 *

 ******************************************************************************/

ACPI_STATUS

AcpiGetTableByIndex (

    UINT32                  TableIndex,

    ACPI_TABLE_HEADER       **Table)

{

    ACPI_STATUS             Status;

    ACPI_FUNCTION_TRACE (AcpiGetTableByIndex);

    /* Parameter validation */

    if (!Table)

    {

        return_ACPI_STATUS (AE_BAD_PARAMETER);

    }

    (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);

    /* Validate index */

    if (TableIndex >= AcpiGbl_RootTableList.CurrentTableCount)

    {

        (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);

        return_ACPI_STATUS (AE_BAD_PARAMETER);

    }

    if (!AcpiGbl_RootTableList.Tables[TableIndex].Pointer)

    {

        /* Table is not mapped, map it */

        Status = AcpiTbVerifyTable (&AcpiGbl_RootTableList.Tables[TableIndex]);

        if (ACPI_FAILURE (Status))

        {

            (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);

            return_ACPI_STATUS (Status);

        }

    }

    *Table = AcpiGbl_RootTableList.Tables[TableIndex].Pointer;

    (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);

    return_ACPI_STATUS (AE_OK);

}

ACPI_EXPORT_SYMBOL (AcpiGetTableByIndex)

/*******************************************************************************

 *

 * FUNCTION:    AcpiTbLoadNamespace

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in

 *              the RSDT/XSDT.

 *

 ******************************************************************************/

static ACPI_STATUS

AcpiTbLoadNamespace (

    void)

{

    ACPI_STATUS             Status;

    UINT32                  i;

    ACPI_TABLE_HEADER       *NewDsdt;

    ACPI_FUNCTION_TRACE (TbLoadNamespace);

    (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);

    /*

     * Load the namespace. The DSDT is required, but any SSDT and

     * PSDT tables are optional. Verify the DSDT.

     */

    if (!AcpiGbl_RootTableList.CurrentTableCount ||

        !ACPI_COMPARE_NAME (

            &(AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT].Signature),

            ACPI_SIG_DSDT) ||

         ACPI_FAILURE (AcpiTbVerifyTable (

            &AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT])))

    {

        Status = AE_NO_ACPI_TABLES;

        goto UnlockAndExit;

    }

    /*

     * Save the DSDT pointer for simple access. This is the mapped memory

     * address. We must take care here because the address of the .Tables

     * array can change dynamically as tables are loaded at run-time. Note:

     * .Pointer field is not validated until after call to AcpiTbVerifyTable.

     */

    AcpiGbl_DSDT = AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT].Pointer;

    /*

     * Optionally copy the entire DSDT to local memory (instead of simply

     * mapping it.) There are some BIOSs that corrupt or replace the original

     * DSDT, creating the need for this option. Default is FALSE, do not copy

     * the DSDT.

     */

    if (AcpiGbl_CopyDsdtLocally)

    {

        NewDsdt = AcpiTbCopyDsdt (ACPI_TABLE_INDEX_DSDT);

        if (NewDsdt)

        {

            AcpiGbl_DSDT = NewDsdt;

        }

    }

    /*

     * Save the original DSDT header for detection of table corruption

     * and/or replacement of the DSDT from outside the OS.

     */

    ACPI_MEMCPY (&AcpiGbl_OriginalDsdtHeader, AcpiGbl_DSDT,

        sizeof (ACPI_TABLE_HEADER));

    (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);

    /* Load and parse tables */

    Status = AcpiNsLoadTable (ACPI_TABLE_INDEX_DSDT, AcpiGbl_RootNode);

    if (ACPI_FAILURE (Status))

    {

        return_ACPI_STATUS (Status);

    }

    /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */

    (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);

    for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; ++i)

    {

        if ((!ACPI_COMPARE_NAME (&(AcpiGbl_RootTableList.Tables[i].Signature),

                    ACPI_SIG_SSDT) &&

             !ACPI_COMPARE_NAME (&(AcpiGbl_RootTableList.Tables[i].Signature),

                    ACPI_SIG_PSDT)) ||

             ACPI_FAILURE (AcpiTbVerifyTable (

                &AcpiGbl_RootTableList.Tables[i])))

        {

            continue;

        }

        /* Ignore errors while loading tables, get as many as possible */

        (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);

        (void) AcpiNsLoadTable (i, AcpiGbl_RootNode);

        (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);

    }

    ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));

UnlockAndExit:

    (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);

    return_ACPI_STATUS (Status);

}

/*******************************************************************************

 *

 * FUNCTION:    AcpiLoadTables

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT

 *

 ******************************************************************************/

ACPI_STATUS

AcpiLoadTables (

    void)

{

    ACPI_STATUS             Status;

    ACPI_FUNCTION_TRACE (AcpiLoadTables);

    /* Load the namespace from the tables */

    Status = AcpiTbLoadNamespace ();

    if (ACPI_FAILURE (Status))

    {

        ACPI_EXCEPTION ((AE_INFO, Status,

            "While loading namespace from ACPI tables"));

    }

    return_ACPI_STATUS (Status);

}

ACPI_EXPORT_SYMBOL (AcpiLoadTables)

/*******************************************************************************

 *

 * FUNCTION:    AcpiInstallTableHandler

 *

 * PARAMETERS:  Handler         - Table event handler

 *              Context         - Value passed to the handler on each event

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Install 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 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)