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

 *

 * Module Name: evregion - ACPI AddressSpace (OpRegion) handler dispatch

 *

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

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

 *

 * 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 __EVREGION_C__

#include "acpi.h"

#include "accommon.h"

#include "acevents.h"

#include "acnamesp.h"

#include "acinterp.h"

#define _COMPONENT          ACPI_EVENTS

        ACPI_MODULE_NAME    ("evregion")

/* Local prototypes */

static BOOLEAN

AcpiEvHasDefaultHandler (

    ACPI_NAMESPACE_NODE     *Node,

    ACPI_ADR_SPACE_TYPE     SpaceId);

static void

AcpiEvOrphanEcRegMethod (

    void);

static ACPI_STATUS

AcpiEvRegRun (

    ACPI_HANDLE             ObjHandle,

    UINT32                  Level,

    void                    *Context,

    void                    **ReturnValue);

static ACPI_STATUS

AcpiEvInstallHandler (

    ACPI_HANDLE             ObjHandle,

    UINT32                  Level,

    void                    *Context,

    void                    **ReturnValue);

/* These are the address spaces that will get default handlers */

#define ACPI_NUM_DEFAULT_SPACES     4

static UINT8        AcpiGbl_DefaultAddressSpaces[ACPI_NUM_DEFAULT_SPACES] =

{

    ACPI_ADR_SPACE_SYSTEM_MEMORY,

    ACPI_ADR_SPACE_SYSTEM_IO,

    ACPI_ADR_SPACE_PCI_CONFIG,

    ACPI_ADR_SPACE_DATA_TABLE

};

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

 *

 * FUNCTION:    AcpiEvInstallRegionHandlers

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Installs the core subsystem default address space handlers.

 *

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

ACPI_STATUS

AcpiEvInstallRegionHandlers (

    void)

{

    ACPI_STATUS             Status;

    UINT32                  i;

    ACPI_FUNCTION_TRACE (EvInstallRegionHandlers);

    Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);

    if (ACPI_FAILURE (Status))

    {

        return_ACPI_STATUS (Status);

    }

    /*

     * All address spaces (PCI Config, EC, SMBus) are scope dependent and

     * registration must occur for a specific device.

     *

     * In the case of the system memory and IO address spaces there is

     * currently no device associated with the address space. For these we

     * use the root.

     *

     * We install the default PCI config space handler at the root so that

     * this space is immediately available even though the we have not

     * enumerated all the PCI Root Buses yet. This is to conform to the ACPI

     * specification which states that the PCI config space must be always

     * available -- even though we are nowhere near ready to find the PCI root

     * buses at this point.

     *

     * NOTE: We ignore AE_ALREADY_EXISTS because this means that a handler

     * has already been installed (via AcpiInstallAddressSpaceHandler).

     * Similar for AE_SAME_HANDLER.

     */

    for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++)

    {

        Status = AcpiEvInstallSpaceHandler (AcpiGbl_RootNode,

                    AcpiGbl_DefaultAddressSpaces[i],

                    ACPI_DEFAULT_HANDLER, NULL, NULL);

        switch (Status)

        {

        case AE_OK:

        case AE_SAME_HANDLER:

        case AE_ALREADY_EXISTS:

            /* These exceptions are all OK */

            Status = AE_OK;

            break;

        default:

            goto UnlockAndExit;

        }

    }

UnlockAndExit:

    (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);

    return_ACPI_STATUS (Status);

}

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

 *

 * FUNCTION:    AcpiEvHasDefaultHandler

 *

 * PARAMETERS:  Node                - Namespace node for the device

 *              SpaceId             - The address space ID

 *

 * RETURN:      TRUE if default handler is installed, FALSE otherwise

 *

 * DESCRIPTION: Check if the default handler is installed for the requested

 *              space ID.

 *

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

static BOOLEAN

AcpiEvHasDefaultHandler (

    ACPI_NAMESPACE_NODE     *Node,

    ACPI_ADR_SPACE_TYPE     SpaceId)

{

    ACPI_OPERAND_OBJECT     *ObjDesc;

    ACPI_OPERAND_OBJECT     *HandlerObj;

    /* Must have an existing internal object */

    ObjDesc = AcpiNsGetAttachedObject (Node);

    if (ObjDesc)

    {

        HandlerObj = ObjDesc->Device.Handler;

        /* Walk the linked list of handlers for this object */

        while (HandlerObj)

        {

            if (HandlerObj->AddressSpace.SpaceId == SpaceId)

            {

                if (HandlerObj->AddressSpace.HandlerFlags &

                        ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)

                {

                    return (TRUE);

                }

            }

            HandlerObj = HandlerObj->AddressSpace.Next;

        }

    }

    return (FALSE);

}

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

 *

 * FUNCTION:    AcpiEvInitializeOpRegions

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Execute _REG methods for all Operation Regions that have

 *              an installed default region handler.

 *

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

ACPI_STATUS

AcpiEvInitializeOpRegions (

    void)

{

    ACPI_STATUS             Status;

    UINT32                  i;

    ACPI_FUNCTION_TRACE (EvInitializeOpRegions);

    Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);

    if (ACPI_FAILURE (Status))

    {

        return_ACPI_STATUS (Status);

    }

    /* Run the _REG methods for OpRegions in each default address space */

    for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++)

    {

        /*

         * Make sure the installed handler is the DEFAULT handler. If not the

         * default, the _REG methods will have already been run (when the

         * handler was installed)

         */

        if (AcpiEvHasDefaultHandler (AcpiGbl_RootNode,

               AcpiGbl_DefaultAddressSpaces[i]))

        {

            Status = AcpiEvExecuteRegMethods (AcpiGbl_RootNode,

                        AcpiGbl_DefaultAddressSpaces[i]);

        }

    }

    AcpiGbl_RegMethodsExecuted = TRUE;

    (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);

    return_ACPI_STATUS (Status);

}

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

 *

 * FUNCTION:    AcpiEvExecuteRegMethod

 *

 * PARAMETERS:  RegionObj           - Region object

 *              Function            - Passed to _REG: On (1) or Off (0)

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Execute _REG method for a region

 *

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

ACPI_STATUS

AcpiEvExecuteRegMethod (

    ACPI_OPERAND_OBJECT     *RegionObj,

    UINT32                  Function)

{

    ACPI_EVALUATE_INFO      *Info;

    ACPI_OPERAND_OBJECT     *Args[3];

    ACPI_OPERAND_OBJECT     *RegionObj2;

    ACPI_STATUS             Status;

    ACPI_FUNCTION_TRACE (EvExecuteRegMethod);

    RegionObj2 = AcpiNsGetSecondaryObject (RegionObj);

    if (!RegionObj2)

    {

        return_ACPI_STATUS (AE_NOT_EXIST);

    }

    if (RegionObj2->Extra.Method_REG == NULL)

    {

        return_ACPI_STATUS (AE_OK);

    }

    /* Allocate and initialize the evaluation information block */

    Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO));

    if (!Info)

    {

        return_ACPI_STATUS (AE_NO_MEMORY);

    }

    Info->PrefixNode = RegionObj2->Extra.Method_REG;

    Info->Pathname = NULL;

    Info->Parameters = Args;

    Info->Flags = ACPI_IGNORE_RETURN_VALUE;

    /*

     * The _REG method has two arguments:

     *

     * Arg0 - Integer:

     *  Operation region space ID Same value as RegionObj->Region.SpaceId

     *

     * Arg1 - Integer:

     *  connection status 1 for connecting the handler, 0 for disconnecting

     *  the handler (Passed as a parameter)

     */

    Args[0] = AcpiUtCreateIntegerObject ((UINT64) RegionObj->Region.SpaceId);

    if (!Args[0])

    {

        Status = AE_NO_MEMORY;

        goto Cleanup1;

    }

    Args[1] = AcpiUtCreateIntegerObject ((UINT64) Function);

    if (!Args[1])

    {

        Status = AE_NO_MEMORY;

        goto Cleanup2;

    }

    Args[2] = NULL; /* Terminate list */

    /* Execute the method, no return value */

    ACPI_DEBUG_EXEC (

        AcpiUtDisplayInitPathname (ACPI_TYPE_METHOD, Info->PrefixNode, NULL));

    Status = AcpiNsEvaluate (Info);

    AcpiUtRemoveReference (Args[1]);

Cleanup2:

    AcpiUtRemoveReference (Args[0]);

Cleanup1:

    ACPI_FREE (Info);

    return_ACPI_STATUS (Status);

}

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

 *

 * FUNCTION:    AcpiEvAddressSpaceDispatch

 *

 * PARAMETERS:  RegionObj           - Internal region object

 *              Function            - Read or Write operation

 *              RegionOffset        - Where in the region to read or write

 *              BitWidth            - Field width in bits (8, 16, 32, or 64)

 *              Value               - Pointer to in or out value, must be

 *                                    a full 64-bit integer

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Dispatch an address space or operation region access to

 *              a previously installed handler.

 *

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

ACPI_STATUS

AcpiEvAddressSpaceDispatch (

    ACPI_OPERAND_OBJECT     *RegionObj,

    UINT32                  Function,

    UINT32                  RegionOffset,

    UINT32                  BitWidth,

    UINT64                  *Value)

{

    ACPI_STATUS             Status;

    ACPI_ADR_SPACE_HANDLER  Handler;

    ACPI_ADR_SPACE_SETUP    RegionSetup;

    ACPI_OPERAND_OBJECT     *HandlerDesc;

    ACPI_OPERAND_OBJECT     *RegionObj2;

    void                    *RegionContext = NULL;

    ACPI_FUNCTION_TRACE (EvAddressSpaceDispatch);

    RegionObj2 = AcpiNsGetSecondaryObject (RegionObj);

    if (!RegionObj2)

    {

        return_ACPI_STATUS (AE_NOT_EXIST);

    }

    /* Ensure that there is a handler associated with this region */

    HandlerDesc = RegionObj->Region.Handler;

    if (!HandlerDesc)

    {

        ACPI_ERROR ((AE_INFO,

            "No handler for Region [%4.4s] (%p) [%s]",

            AcpiUtGetNodeName (RegionObj->Region.Node),

            RegionObj, AcpiUtGetRegionName (RegionObj->Region.SpaceId)));

        return_ACPI_STATUS (AE_NOT_EXIST);

    }

    /*

     * It may be the case that the region has never been initialized.

     * Some types of regions require special init code

     */

    if (!(RegionObj->Region.Flags & AOPOBJ_SETUP_COMPLETE))

    {

        /* This region has not been initialized yet, do it */

        RegionSetup = HandlerDesc->AddressSpace.Setup;

        if (!RegionSetup)

        {

            /* No initialization routine, exit with error */

            ACPI_ERROR ((AE_INFO,

                "No init routine for region(%p) [%s]",

                RegionObj, AcpiUtGetRegionName (RegionObj->Region.SpaceId)));

            return_ACPI_STATUS (AE_NOT_EXIST);

        }

        /*

         * We must exit the interpreter because the region setup will

         * potentially execute control methods (for example, the _REG method

         * for this region)

         */

        AcpiExExitInterpreter ();

        Status = RegionSetup (RegionObj, ACPI_REGION_ACTIVATE,

                    HandlerDesc->AddressSpace.Context, &RegionContext);

        /* Re-enter the interpreter */

        AcpiExEnterInterpreter ();

        /* Check for failure of the Region Setup */

        if (ACPI_FAILURE (Status))

        {

            ACPI_EXCEPTION ((AE_INFO, Status,

                "During region initialization: [%s]",

                AcpiUtGetRegionName (RegionObj->Region.SpaceId)));

            return_ACPI_STATUS (Status);

        }

        /* Region initialization may have been completed by RegionSetup */

        if (!(RegionObj->Region.Flags & AOPOBJ_SETUP_COMPLETE))

        {

            RegionObj->Region.Flags |= AOPOBJ_SETUP_COMPLETE;

            if (RegionObj2->Extra.RegionContext)

            {

                /* The handler for this region was already installed */

                ACPI_FREE (RegionContext);

            }

            else

            {

                /*

                 * Save the returned context for use in all accesses to

                 * this particular region

                 */

                RegionObj2->Extra.RegionContext = RegionContext;

            }

        }

    }

    /* We have everything we need, we can invoke the address space handler */

    Handler = HandlerDesc->AddressSpace.Handler;

    ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,

        "Handler %p (@%p) Address %8.8X%8.8X [%s]\n",

        &RegionObj->Region.Handler->AddressSpace, Handler,

        ACPI_FORMAT_NATIVE_UINT (RegionObj->Region.Address + RegionOffset),

        AcpiUtGetRegionName (RegionObj->Region.SpaceId)));

    if (!(HandlerDesc->AddressSpace.HandlerFlags &

            ACPI_ADDR_HANDLER_DEFAULT_INSTALLED))

    {

        /*

         * For handlers other than the default (supplied) handlers, we must

         * exit the interpreter because the handler *might* block -- we don't

         * know what it will do, so we can't hold the lock on the intepreter.

         */

        AcpiExExitInterpreter();

    }

    /* Call the handler */

    Status = Handler (Function,

        (RegionObj->Region.Address + RegionOffset), BitWidth, Value,

        HandlerDesc->AddressSpace.Context, RegionObj2->Extra.RegionContext);

    if (ACPI_FAILURE (Status))

    {

        ACPI_EXCEPTION ((AE_INFO, Status, "Returned by Handler for [%s]",

            AcpiUtGetRegionName (RegionObj->Region.SpaceId)));

    }

    if (!(HandlerDesc->AddressSpace.HandlerFlags &

            ACPI_ADDR_HANDLER_DEFAULT_INSTALLED))

    {

        /*

         * We just returned from a non-default handler, we must re-enter the

         * interpreter

         */

       AcpiExEnterInterpreter ();

    }

    return_ACPI_STATUS (Status);

}

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

 *

 * FUNCTION:    AcpiEvDetachRegion

 *

 * PARAMETERS:  RegionObj           - Region Object

 *              AcpiNsIsLocked      - Namespace Region Already Locked?

 *

 * RETURN:      None

 *

 * DESCRIPTION: Break the association between the handler and the region

 *              this is a two way association.

 *

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

void

AcpiEvDetachRegion(

    ACPI_OPERAND_OBJECT     *RegionObj,

    BOOLEAN                 AcpiNsIsLocked)

{

    ACPI_OPERAND_OBJECT     *HandlerObj;

    ACPI_OPERAND_OBJECT     *ObjDesc;

    ACPI_OPERAND_OBJECT     **LastObjPtr;

    ACPI_ADR_SPACE_SETUP    RegionSetup;

    void                    **RegionContext;

    ACPI_OPERAND_OBJECT     *RegionObj2;

    ACPI_STATUS             Status;

    ACPI_FUNCTION_TRACE (EvDetachRegion);

    RegionObj2 = AcpiNsGetSecondaryObject (RegionObj);

    if (!RegionObj2)

    {

        return_VOID;

    }

    RegionContext = &RegionObj2->Extra.RegionContext;

    /* Get the address handler from the region object */

    HandlerObj = RegionObj->Region.Handler;

    if (!HandlerObj)

    {

        /* This region has no handler, all done */

        return_VOID;

    }

    /* Find this region in the handler's list */

    ObjDesc = HandlerObj->AddressSpace.RegionList;

    LastObjPtr = &HandlerObj->AddressSpace.RegionList;

    while (ObjDesc)

    {

        /* Is this the correct Region? */

        if (ObjDesc == RegionObj)

        {

            ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,

                "Removing Region %p from address handler %p\n",

                RegionObj, HandlerObj));

            /* This is it, remove it from the handler's list */

            *LastObjPtr = ObjDesc->Region.Next;

            ObjDesc->Region.Next = NULL;        /* Must clear field */

            if (AcpiNsIsLocked)

            {

                Status = AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);

                if (ACPI_FAILURE (Status))

                {

                    return_VOID;

                }

            }

            /* Now stop region accesses by executing the _REG method */

            Status = AcpiEvExecuteRegMethod (RegionObj, ACPI_REG_DISCONNECT);

            if (ACPI_FAILURE (Status))

            {

                ACPI_EXCEPTION ((AE_INFO, Status, "from region _REG, [%s]",

                    AcpiUtGetRegionName (RegionObj->Region.SpaceId)));

            }

            if (AcpiNsIsLocked)

            {

                Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);

                if (ACPI_FAILURE (Status))

                {

                    return_VOID;

                }

            }

            /*

             * If the region has been activated, call the setup handler with

             * the deactivate notification

             */

            if (RegionObj->Region.Flags & AOPOBJ_SETUP_COMPLETE)

            {

                RegionSetup = HandlerObj->AddressSpace.Setup;

                Status = RegionSetup (RegionObj, ACPI_REGION_DEACTIVATE,

                    HandlerObj->AddressSpace.Context, RegionContext);

                /* Init routine may fail, Just ignore errors */

                if (ACPI_FAILURE (Status))

                {

                    ACPI_EXCEPTION ((AE_INFO, Status,

                        "from region handler - deactivate, [%s]",

                        AcpiUtGetRegionName (RegionObj->Region.SpaceId)));

                }

                RegionObj->Region.Flags &= ~(AOPOBJ_SETUP_COMPLETE);

            }

            /*

             * Remove handler reference in the region

             *

             * NOTE: this doesn't mean that the region goes away, the region

             * is just inaccessible as indicated to the _REG method

             *

             * If the region is on the handler's list, this must be the

             * region's handler

             */

            RegionObj->Region.Handler = NULL;

            AcpiUtRemoveReference (HandlerObj);

            return_VOID;

        }

        /* Walk the linked list of handlers */

        LastObjPtr = &ObjDesc->Region.Next;

        ObjDesc = ObjDesc->Region.Next;

    }

    /* If we get here, the region was not in the handler's region list */

    ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,

        "Cannot remove region %p from address handler %p\n",

        RegionObj, HandlerObj));

    return_VOID;

}

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

 *

 * FUNCTION:    AcpiEvAttachRegion

 *

 * PARAMETERS:  HandlerObj          - Handler Object

 *              RegionObj           - Region Object

 *              AcpiNsIsLocked      - Namespace Region Already Locked?

 *

 * RETURN:      None

 *

 * DESCRIPTION: Create the association between the handler and the region

 *              this is a two way association.

 *

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

ACPI_STATUS

AcpiEvAttachRegion (

    ACPI_OPERAND_OBJECT     *HandlerObj,

    ACPI_OPERAND_OBJECT     *RegionObj,

    BOOLEAN                 AcpiNsIsLocked)

{

    ACPI_FUNCTION_TRACE (EvAttachRegion);

    ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,

        "Adding Region [%4.4s] %p to address handler %p [%s]\n",

        AcpiUtGetNodeName (RegionObj->Region.Node),

        RegionObj, HandlerObj,

        AcpiUtGetRegionName (RegionObj->Region.SpaceId)));

    /* Link this region to the front of the handler's list */

    RegionObj->Region.Next = HandlerObj->AddressSpace.RegionList;

    HandlerObj->AddressSpace.RegionList = RegionObj;

    /* Install the region's handler */

    if (RegionObj->Region.Handler)

    {

        return_ACPI_STATUS (AE_ALREADY_EXISTS);

    }

    RegionObj->Region.Handler = HandlerObj;

    AcpiUtAddReference (HandlerObj);

    return_ACPI_STATUS (AE_OK);

}

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

 *

 * FUNCTION:    AcpiEvInstallHandler

 *

 * PARAMETERS:  WalkNamespace callback

 *

 * DESCRIPTION: This routine installs an address handler into objects that are

 *              of type Region or Device.

 *

 *              If the Object is a Device, and the device has a handler of

 *              the same type then the search is terminated in that branch.

 *

 *              This is because the existing handler is closer in proximity

 *              to any more regions than the one we are trying to install.

 *

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

static ACPI_STATUS

AcpiEvInstallHandler (

    ACPI_HANDLE             ObjHandle,

    UINT32                  Level,

    void                    *Context,

    void                    **ReturnValue)

{

    ACPI_OPERAND_OBJECT     *HandlerObj;

    ACPI_OPERAND_OBJECT     *NextHandlerObj;

    ACPI_OPERAND_OBJECT     *ObjDesc;

    ACPI_NAMESPACE_NODE     *Node;

    ACPI_STATUS             Status;

    ACPI_FUNCTION_NAME (EvInstallHandler);

    HandlerObj = (ACPI_OPERAND_OBJECT  *) Context;

    /* Parameter validation */

    if (!HandlerObj)

    {

        return (AE_OK);

    }

    /* Convert and validate the device handle */

    Node = AcpiNsValidateHandle (ObjHandle);

    if (!Node)

    {

        return (AE_BAD_PARAMETER);

    }

    /*

     * We only care about regions and objects that are allowed to have

     * address space handlers

     */

    if ((Node->Type != ACPI_TYPE_DEVICE) &&

        (Node->Type != ACPI_TYPE_REGION) &&

        (Node != AcpiGbl_RootNode))

    {

        return (AE_OK);

    }

    /* Check for an existing internal object */

    ObjDesc = AcpiNsGetAttachedObject (Node);

    if (!ObjDesc)

    {

        /* No object, just exit */

        return (AE_OK);

    }

    /* Devices are handled different than regions */

    if (ObjDesc->Common.Type == ACPI_TYPE_DEVICE)

    {

        /* Check if this Device already has a handler for this address space */

        NextHandlerObj = ObjDesc->Device.Handler;

        while (NextHandlerObj)

        {

            /* Found a handler, is it for the same address space? */

            if (NextHandlerObj->AddressSpace.SpaceId ==

                    HandlerObj->AddressSpace.SpaceId)

            {

                ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,

                    "Found handler for region [%s] in device %p(%p) "

                    "handler %p\n",

                    AcpiUtGetRegionName (HandlerObj->AddressSpace.SpaceId),

                    ObjDesc, NextHandlerObj, HandlerObj));

                /*

                 * Since the object we found it on was a device, then it

                 * means that someone has already installed a handler for

                 * the branch of the namespace from this device on. Just

                 * bail out telling the walk routine to not traverse this

                 * branch. This preserves the scoping rule for handlers.

                 */

                return (AE_CTRL_DEPTH);

            }

            /* Walk the linked list of handlers attached to this device */

            NextHandlerObj = NextHandlerObj->AddressSpace.Next;

        }

        /*

         * As long as the device didn't have a handler for this space we

         * don't care about it. We just ignore it and proceed.

         */

        return (AE_OK);

    }

    /* Object is a Region */

    if (ObjDesc->Region.SpaceId != HandlerObj->AddressSpace.SpaceId)

    {

        /* This region is for a different address space, just ignore it */

        return (AE_OK);

    }

    /*

     * Now we have a region and it is for the handler's address space type.

     *

     * First disconnect region for any previous handler (if any)

     */

    AcpiEvDetachRegion (ObjDesc, FALSE);

    /* Connect the region to the new handler */

    Status = AcpiEvAttachRegion (HandlerObj, ObjDesc, FALSE);

    return (Status);

}

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

 *

 * FUNCTION:    AcpiEvInstallSpaceHandler

 *

 * PARAMETERS:  Node            - Namespace node for the device

 *              SpaceId         - The address space ID

 *              Handler         - Address of the handler

 *              Setup           - Address of the setup function

 *              Context         - Value passed to the handler on each access

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Install a handler for all OpRegions of a given SpaceId.

 *              Assumes namespace is locked

 *

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

ACPI_STATUS

AcpiEvInstallSpaceHandler (

    ACPI_NAMESPACE_NODE     *Node,

    ACPI_ADR_SPACE_TYPE     SpaceId,

    ACPI_ADR_SPACE_HANDLER  Handler,

    ACPI_ADR_SPACE_SETUP    Setup,

    void                    *Context)

{

    ACPI_OPERAND_OBJECT     *ObjDesc;

    ACPI_OPERAND_OBJECT     *HandlerObj;

    ACPI_STATUS             Status;

    ACPI_OBJECT_TYPE        Type;

    UINT8                  Flags = 0;

    ACPI_FUNCTION_TRACE (EvInstallSpaceHandler);

    /*

     * This registration is valid for only the types below and the root. This

     * is where the default handlers get placed.

     */

    if ((Node->Type != ACPI_TYPE_DEVICE)     &&

        (Node->Type != ACPI_TYPE_PROCESSOR)  &&

        (Node->Type != ACPI_TYPE_THERMAL)    &&

        (Node != AcpiGbl_RootNode))

    {

        Status = AE_BAD_PARAMETER;

        goto UnlockAndExit;

    }

    if (Handler == ACPI_DEFAULT_HANDLER)

    {

        Flags = ACPI_ADDR_HANDLER_DEFAULT_INSTALLED;

        switch (SpaceId)

        {

        case ACPI_ADR_SPACE_SYSTEM_MEMORY:

            Handler = AcpiExSystemMemorySpaceHandler;

            Setup   = AcpiEvSystemMemoryRegionSetup;

            break;

        case ACPI_ADR_SPACE_SYSTEM_IO:

            Handler = AcpiExSystemIoSpaceHandler;

            Setup   = AcpiEvIoSpaceRegionSetup;

            break;

        case ACPI_ADR_SPACE_PCI_CONFIG:

            Handler = AcpiExPciConfigSpaceHandler;

            Setup   = AcpiEvPciConfigRegionSetup;

            break;

        case ACPI_ADR_SPACE_CMOS:

            Handler = AcpiExCmosSpaceHandler;

            Setup   = AcpiEvCmosRegionSetup;

            break;

        case ACPI_ADR_SPACE_PCI_BAR_TARGET:

            Handler = AcpiExPciBarSpaceHandler;

            Setup   = AcpiEvPciBarRegionSetup;

            break;

        case ACPI_ADR_SPACE_DATA_TABLE:

            Handler = AcpiExDataTableSpaceHandler;

            Setup   = NULL;

            break;

        default:

            Status = AE_BAD_PARAMETER;

            goto UnlockAndExit;

        }

    }

    /* If the caller hasn't specified a setup routine, use the default */

    if (!Setup)

    {

        Setup = AcpiEvDefaultRegionSetup;

    }

    /* Check for an existing internal object */

    ObjDesc = AcpiNsGetAttachedObject (Node);

    if (ObjDesc)

    {

        /*

         * The attached device object already exists. Make sure the handler

         * is not already installed.

         */

        HandlerObj = ObjDesc->Device.Handler;

        /* Walk the handler list for this device */

        while (HandlerObj)

        {

            /* Same SpaceId indicates a handler already installed */

            if (HandlerObj->AddressSpace.SpaceId == SpaceId)

            {

                if (HandlerObj->AddressSpace.Handler == Handler)

                {

                    /*

                     * It is (relatively) OK to attempt to install the SAME

                     * handler twice. This can easily happen with the

                     * PCI_Config space.

                     */

                    Status = AE_SAME_HANDLER;

                    goto UnlockAndExit;

                }

                else

                {

                    /* A handler is already installed */

                    Status = AE_ALREADY_EXISTS;

                }

                goto UnlockAndExit;

            }

            /* Walk the linked list of handlers */

            HandlerObj = HandlerObj->AddressSpace.Next;

        }

    }

    else

    {

        ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,

            "Creating object on Device %p while installing handler\n", Node));

        /* ObjDesc does not exist, create one */

        if (Node->Type == ACPI_TYPE_ANY)

        {

            Type = ACPI_TYPE_DEVICE;

        }

        else

        {

            Type = Node->Type;

        }

        ObjDesc = AcpiUtCreateInternalObject (Type);

        if (!ObjDesc)

        {

            Status = AE_NO_MEMORY;

            goto UnlockAndExit;

        }

        /* Init new descriptor */

        ObjDesc->Common.Type = (UINT8) Type;

        /* Attach the new object to the Node */

        Status = AcpiNsAttachObject (Node, ObjDesc, Type);

        /* Remove local reference to the object */

        AcpiUtRemoveReference (ObjDesc);

        if (ACPI_FAILURE (Status))

        {

            goto UnlockAndExit;

        }

    }

    ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,

        "Installing address handler for region %s(%X) on Device %4.4s %p(%p)\n",