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

 *

 * Module Name: utxface - External interfaces for "global" ACPI functions

 *

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

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

 *

 * 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 __UTXFACE_C__

#include "acpi.h"

#include "accommon.h"

#include "acevents.h"

#include "acnamesp.h"

#include "acdebug.h"

#include "actables.h"

#define _COMPONENT          ACPI_UTILITIES

        ACPI_MODULE_NAME    ("utxface")

#ifndef ACPI_ASL_COMPILER

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

 *

 * FUNCTION:    AcpiInitializeSubsystem

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Initializes all global variables.  This is the first function

 *              called, so any early initialization belongs here.

 *

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

ACPI_STATUS

AcpiInitializeSubsystem (

    void)

{

    ACPI_STATUS             Status;

    ACPI_FUNCTION_TRACE (AcpiInitializeSubsystem);

    AcpiGbl_StartupFlags = ACPI_SUBSYSTEM_INITIALIZE;

    ACPI_DEBUG_EXEC (AcpiUtInitStackPtrTrace ());

    /* Initialize the OS-Dependent layer */

    Status = AcpiOsInitialize ();

    if (ACPI_FAILURE (Status))

    {

        ACPI_EXCEPTION ((AE_INFO, Status, "During OSL initialization"));

        return_ACPI_STATUS (Status);

    }

    /* Initialize all globals used by the subsystem */

    Status = AcpiUtInitGlobals ();

    if (ACPI_FAILURE (Status))

    {

        ACPI_EXCEPTION ((AE_INFO, Status, "During initialization of globals"));

        return_ACPI_STATUS (Status);

    }

    /* Create the default mutex objects */

    Status = AcpiUtMutexInitialize ();

    if (ACPI_FAILURE (Status))

    {

        ACPI_EXCEPTION ((AE_INFO, Status, "During Global Mutex creation"));

        return_ACPI_STATUS (Status);

    }

    /*

     * Initialize the namespace manager and

     * the root of the namespace tree

     */

    Status = AcpiNsRootInitialize ();

    if (ACPI_FAILURE (Status))

    {

        ACPI_EXCEPTION ((AE_INFO, Status, "During Namespace initialization"));

        return_ACPI_STATUS (Status);

    }

    /* Initialize the global OSI interfaces list with the static names */

    Status = AcpiUtInitializeInterfaces ();

    if (ACPI_FAILURE (Status))

    {

        ACPI_EXCEPTION ((AE_INFO, Status, "During OSI interfaces initialization"));

        return_ACPI_STATUS (Status);

    }

    /* If configured, initialize the AML debugger */

    ACPI_DEBUGGER_EXEC (Status = AcpiDbInitialize ());

    return_ACPI_STATUS (Status);

}

ACPI_EXPORT_SYMBOL (AcpiInitializeSubsystem)

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

 *

 * FUNCTION:    AcpiEnableSubsystem

 *

 * PARAMETERS:  Flags           - Init/enable Options

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Completes the subsystem initialization including hardware.

 *              Puts system into ACPI mode if it isn't already.

 *

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

ACPI_STATUS

AcpiEnableSubsystem (

    UINT32                  Flags)

{

    ACPI_STATUS             Status = AE_OK;

    ACPI_FUNCTION_TRACE (AcpiEnableSubsystem);

    /* Enable ACPI mode */

    if (!(Flags & ACPI_NO_ACPI_ENABLE))

    {

        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Going into ACPI mode\n"));

        AcpiGbl_OriginalMode = AcpiHwGetMode();

        Status = AcpiEnable ();

        if (ACPI_FAILURE (Status))

        {

            ACPI_WARNING ((AE_INFO, "AcpiEnable failed"));

            return_ACPI_STATUS (Status);

        }

    }

    /*

     * Obtain a permanent mapping for the FACS. This is required for the

     * Global Lock and the Firmware Waking Vector

     */

    Status = AcpiTbInitializeFacs ();

    if (ACPI_FAILURE (Status))

    {

        ACPI_WARNING ((AE_INFO, "Could not map the FACS table"));

        return_ACPI_STATUS (Status);

    }

    /*

     * Install the default OpRegion handlers.  These are installed unless

     * other handlers have already been installed via the

     * InstallAddressSpaceHandler interface.

     */

    if (!(Flags & ACPI_NO_ADDRESS_SPACE_INIT))

    {

        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,

            "[Init] Installing default address space handlers\n"));

        Status = AcpiEvInstallRegionHandlers ();

        if (ACPI_FAILURE (Status))

        {

            return_ACPI_STATUS (Status);

        }

    }

    /*

     * Initialize ACPI Event handling (Fixed and General Purpose)

     *

     * Note1: We must have the hardware and events initialized before we can

     * execute any control methods safely. Any control method can require

     * ACPI hardware support, so the hardware must be fully initialized before

     * any method execution!

     *

     * Note2: Fixed events are initialized and enabled here. GPEs are

     * initialized, but cannot be enabled until after the hardware is

     * completely initialized (SCI and GlobalLock activated) and the various

     * initialization control methods are run (_REG, _STA, _INI) on the

     * entire namespace.

     */

    if (!(Flags & ACPI_NO_EVENT_INIT))

    {

        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,

            "[Init] Initializing ACPI events\n"));

        Status = AcpiEvInitializeEvents ();

        if (ACPI_FAILURE (Status))

        {

            return_ACPI_STATUS (Status);

        }

    }

    /*

     * Install the SCI handler and Global Lock handler. This completes the

     * hardware initialization.

     */

    if (!(Flags & ACPI_NO_HANDLER_INIT))

    {

        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,

            "[Init] Installing SCI/GL handlers\n"));

        Status = AcpiEvInstallXruptHandlers ();

        if (ACPI_FAILURE (Status))

        {

            return_ACPI_STATUS (Status);

        }

    }

    return_ACPI_STATUS (Status);

}

ACPI_EXPORT_SYMBOL (AcpiEnableSubsystem)

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

 *

 * FUNCTION:    AcpiInitializeObjects

 *

 * PARAMETERS:  Flags           - Init/enable Options

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Completes namespace initialization by initializing device

 *              objects and executing AML code for Regions, buffers, etc.

 *

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

ACPI_STATUS

AcpiInitializeObjects (

    UINT32                  Flags)

{

    ACPI_STATUS             Status = AE_OK;

    ACPI_FUNCTION_TRACE (AcpiInitializeObjects);

    /*

     * Run all _REG methods

     *

     * Note: Any objects accessed by the _REG methods will be automatically

     * initialized, even if they contain executable AML (see the call to

     * AcpiNsInitializeObjects below).

     */

    if (!(Flags & ACPI_NO_ADDRESS_SPACE_INIT))

    {

        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,

            "[Init] Executing _REG OpRegion methods\n"));

        Status = AcpiEvInitializeOpRegions ();

        if (ACPI_FAILURE (Status))

        {

            return_ACPI_STATUS (Status);

        }

    }

    /*

     * Execute any module-level code that was detected during the table load

     * phase. Although illegal since ACPI 2.0, there are many machines that

     * contain this type of code. Each block of detected executable AML code

     * outside of any control method is wrapped with a temporary control

     * method object and placed on a global list. The methods on this list

     * are executed below.

     */

    AcpiNsExecModuleCodeList ();

    /*

     * Initialize the objects that remain uninitialized. This runs the

     * executable AML that may be part of the declaration of these objects:

     * OperationRegions, BufferFields, Buffers, and Packages.

     */

    if (!(Flags & ACPI_NO_OBJECT_INIT))

    {

        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,

            "[Init] Completing Initialization of ACPI Objects\n"));

        Status = AcpiNsInitializeObjects ();

        if (ACPI_FAILURE (Status))

        {

            return_ACPI_STATUS (Status);

        }

    }

    /*

     * Initialize all device objects in the namespace. This runs the device

     * _STA and _INI methods.

     */

    if (!(Flags & ACPI_NO_DEVICE_INIT))

    {

        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,

            "[Init] Initializing ACPI Devices\n"));

        Status = AcpiNsInitializeDevices ();

        if (ACPI_FAILURE (Status))

        {

            return_ACPI_STATUS (Status);

        }

    }

    /*

     * Empty the caches (delete the cached objects) on the assumption that

     * the table load filled them up more than they will be at runtime --

     * thus wasting non-paged memory.

     */

    Status = AcpiPurgeCachedObjects ();

    AcpiGbl_StartupFlags |= ACPI_INITIALIZED_OK;

    return_ACPI_STATUS (Status);

}

ACPI_EXPORT_SYMBOL (AcpiInitializeObjects)

#endif

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

 *

 * FUNCTION:    AcpiTerminate

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Shutdown the ACPICA subsystem and release all resources.

 *

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

ACPI_STATUS

AcpiTerminate (

    void)

{

    ACPI_STATUS         Status;

    ACPI_FUNCTION_TRACE (AcpiTerminate);

    /* Just exit if subsystem is already shutdown */

    if (AcpiGbl_Shutdown)

    {

        ACPI_ERROR ((AE_INFO, "ACPI Subsystem is already terminated"));

        return_ACPI_STATUS (AE_OK);

    }

    /* Subsystem appears active, go ahead and shut it down */

    AcpiGbl_Shutdown = TRUE;

    AcpiGbl_StartupFlags = 0;

    ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Shutting down ACPI Subsystem\n"));

    /* Terminate the AML Debugger if present */

    ACPI_DEBUGGER_EXEC (AcpiGbl_DbTerminateThreads = TRUE);

    /* Shutdown and free all resources */

    AcpiUtSubsystemShutdown ();

    /* Free the mutex objects */

    AcpiUtMutexTerminate ();

#ifdef ACPI_DEBUGGER

    /* Shut down the debugger */

    AcpiDbTerminate ();

#endif

    /* Now we can shutdown the OS-dependent layer */

    Status = AcpiOsTerminate ();

    return_ACPI_STATUS (Status);

}

ACPI_EXPORT_SYMBOL (AcpiTerminate)

#ifndef ACPI_ASL_COMPILER

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

 *

 * FUNCTION:    AcpiSubsystemStatus

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status of the ACPI subsystem

 *

 * DESCRIPTION: Other drivers that use the ACPI subsystem should call this

 *              before making any other calls, to ensure the subsystem

 *              initialized successfully.

 *

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

ACPI_STATUS

AcpiSubsystemStatus (

    void)

{

    if (AcpiGbl_StartupFlags & ACPI_INITIALIZED_OK)

    {

        return (AE_OK);

    }

    else

    {

        return (AE_ERROR);

    }

}

ACPI_EXPORT_SYMBOL (AcpiSubsystemStatus)

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

 *

 * FUNCTION:    AcpiGetSystemInfo

 *

 * PARAMETERS:  OutBuffer       - A buffer to receive the resources for the

 *                                device

 *

 * RETURN:      Status          - the status of the call

 *

 * DESCRIPTION: This function is called to get information about the current

 *              state of the ACPI subsystem.  It will return system information

 *              in the OutBuffer.

 *

 *              If the function fails an appropriate status will be returned

 *              and the value of OutBuffer is undefined.

 *

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

ACPI_STATUS

AcpiGetSystemInfo (

    ACPI_BUFFER             *OutBuffer)

{

    ACPI_SYSTEM_INFO        *InfoPtr;

    ACPI_STATUS             Status;

    ACPI_FUNCTION_TRACE (AcpiGetSystemInfo);

    /* Parameter validation */

    Status = AcpiUtValidateBuffer (OutBuffer);

    if (ACPI_FAILURE (Status))

    {

        return_ACPI_STATUS (Status);

    }

    /* Validate/Allocate/Clear caller buffer */

    Status = AcpiUtInitializeBuffer (OutBuffer, sizeof (ACPI_SYSTEM_INFO));

    if (ACPI_FAILURE (Status))

    {

        return_ACPI_STATUS (Status);

    }

    /*

     * Populate the return buffer

     */

    InfoPtr = (ACPI_SYSTEM_INFO *) OutBuffer->Pointer;

    InfoPtr->AcpiCaVersion = ACPI_CA_VERSION;

    /* System flags (ACPI capabilities) */

    InfoPtr->Flags = ACPI_SYS_MODE_ACPI;

    /* Timer resolution - 24 or 32 bits  */

    if (AcpiGbl_FADT.Flags & ACPI_FADT_32BIT_TIMER)

    {

        InfoPtr->TimerResolution = 24;

    }

    else

    {

        InfoPtr->TimerResolution = 32;

    }

    /* Clear the reserved fields */

    InfoPtr->Reserved1 = 0;

    InfoPtr->Reserved2 = 0;

    /* Current debug levels */

    InfoPtr->DebugLayer = AcpiDbgLayer;

    InfoPtr->DebugLevel = AcpiDbgLevel;

    return_ACPI_STATUS (AE_OK);

}

ACPI_EXPORT_SYMBOL (AcpiGetSystemInfo)

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

 *

 * FUNCTION:    AcpiGetStatistics

 *

 * PARAMETERS:  Stats           - Where the statistics are returned

 *

 * RETURN:      Status          - the status of the call

 *

 * DESCRIPTION: Get the contents of the various system counters

 *

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

ACPI_STATUS

AcpiGetStatistics (

    ACPI_STATISTICS         *Stats)

{

    ACPI_FUNCTION_TRACE (AcpiGetStatistics);

    /* Parameter validation */

    if (!Stats)

    {

        return_ACPI_STATUS (AE_BAD_PARAMETER);

    }

    /* Various interrupt-based event counters */

    Stats->SciCount = AcpiSciCount;

    Stats->GpeCount = AcpiGpeCount;

    ACPI_MEMCPY (Stats->FixedEventCount, AcpiFixedEventCount,

        sizeof (AcpiFixedEventCount));

    /* Other counters */

    Stats->MethodCount = AcpiMethodCount;

    return_ACPI_STATUS (AE_OK);

}

ACPI_EXPORT_SYMBOL (AcpiGetStatistics)

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

 *

 * FUNCTION:    AcpiInstallInitializationHandler

 *

 * PARAMETERS:  Handler             - Callback procedure

 *              Function            - Not (currently) used, see below

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Install an initialization handler

 *

 * TBD: When a second function is added, must save the Function also.

 *

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

ACPI_STATUS

AcpiInstallInitializationHandler (

    ACPI_INIT_HANDLER       Handler,

    UINT32                  Function)

{

    if (!Handler)

    {

        return (AE_BAD_PARAMETER);

    }

    if (AcpiGbl_InitHandler)

    {

        return (AE_ALREADY_EXISTS);

    }

    AcpiGbl_InitHandler = Handler;

    return AE_OK;

}

ACPI_EXPORT_SYMBOL (AcpiInstallInitializationHandler)

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

 *

 * FUNCTION:    AcpiPurgeCachedObjects

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Empty all caches (delete the cached objects)

 *

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

ACPI_STATUS

AcpiPurgeCachedObjects (

    void)

{

    ACPI_FUNCTION_TRACE (AcpiPurgeCachedObjects);

    (void) AcpiOsPurgeCache (AcpiGbl_StateCache);

    (void) AcpiOsPurgeCache (AcpiGbl_OperandCache);

    (void) AcpiOsPurgeCache (AcpiGbl_PsNodeCache);

    (void) AcpiOsPurgeCache (AcpiGbl_PsNodeExtCache);

    return_ACPI_STATUS (AE_OK);

}

ACPI_EXPORT_SYMBOL (AcpiPurgeCachedObjects)

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

 *

 * FUNCTION:    AcpiInstallInterface

 *

 * PARAMETERS:  InterfaceName       - The interface to install

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Install an _OSI interface to the global list

 *

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

ACPI_STATUS

AcpiInstallInterface (

    ACPI_STRING             InterfaceName)

{

    ACPI_STATUS             Status;

    ACPI_INTERFACE_INFO     *InterfaceInfo;

    /* Parameter validation */

    if (!InterfaceName || (ACPI_STRLEN (InterfaceName) == 0))

    {

        return (AE_BAD_PARAMETER);

    }

    (void) AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER);

    /* Check if the interface name is already in the global list */

    InterfaceInfo = AcpiUtGetInterface (InterfaceName);

    if (InterfaceInfo)

    {

        /*

         * The interface already exists in the list. This is OK if the

         * interface has been marked invalid -- just clear the bit.

         */

        if (InterfaceInfo->Flags & ACPI_OSI_INVALID)

        {

            InterfaceInfo->Flags &= ~ACPI_OSI_INVALID;

            Status = AE_OK;

        }

        else

        {

            Status = AE_ALREADY_EXISTS;

        }

    }

    else

    {

        /* New interface name, install into the global list */

        Status = AcpiUtInstallInterface (InterfaceName);

    }

    AcpiOsReleaseMutex (AcpiGbl_OsiMutex);

    return (Status);

}

ACPI_EXPORT_SYMBOL (AcpiInstallInterface)

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

 *

 * FUNCTION:    AcpiRemoveInterface

 *

 * PARAMETERS:  InterfaceName       - The interface to remove

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Remove an _OSI interface from the global list

 *

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

ACPI_STATUS

AcpiRemoveInterface (

    ACPI_STRING             InterfaceName)

{

    ACPI_STATUS             Status;

    /* Parameter validation */

    if (!InterfaceName || (ACPI_STRLEN (InterfaceName) == 0))

    {

        return (AE_BAD_PARAMETER);

    }

    (void) AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER);

    Status = AcpiUtRemoveInterface (InterfaceName);

    AcpiOsReleaseMutex (AcpiGbl_OsiMutex);

    return (Status);

}

ACPI_EXPORT_SYMBOL (AcpiRemoveInterface)

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

 *

 * FUNCTION:    AcpiInstallInterfaceHandler

 *

 * PARAMETERS:  Handler             - The _OSI interface handler to install

 *                                    NULL means "remove existing handler"

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Install a handler for the predefined _OSI ACPI method.

 *              invoked during execution of the internal implementation of

 *              _OSI. A NULL handler simply removes any existing handler.

 *

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

ACPI_STATUS

AcpiInstallInterfaceHandler (

    ACPI_INTERFACE_HANDLER  Handler)

{

    ACPI_STATUS             Status = AE_OK;

    (void) AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER);

    if (Handler && AcpiGbl_InterfaceHandler)

    {

        Status = AE_ALREADY_EXISTS;

    }

    else

    {

        AcpiGbl_InterfaceHandler = Handler;

    }

    AcpiOsReleaseMutex (AcpiGbl_OsiMutex);

    return (Status);

}

ACPI_EXPORT_SYMBOL (AcpiInstallInterfaceHandler)

#endif /* !ACPI_ASL_COMPILER */