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 /*******************************************************************************
  *
  * Module Name: dsmthdat - control method arguments and local variables
  *
  ******************************************************************************/
 
 /******************************************************************************
  *
  * 1. Copyright Notice
  *
  * Some or all of this work - Copyright (c) 1999 - 2009, 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 __DSMTHDAT_C__
 
 #include "acpi.h"
 #include "accommon.h"
 #include "acdispat.h"
 #include "acnamesp.h"
 #include "acinterp.h"
 
 
 #define _COMPONENT          ACPI_DISPATCHER
         ACPI_MODULE_NAME    ("dsmthdat")
 
 /* Local prototypes */
 
 static void
 AcpiDsMethodDataDeleteValue (
     UINT8                   Type,
     UINT32                  Index,
     ACPI_WALK_STATE         *WalkState);
 
 static ACPI_STATUS
 AcpiDsMethodDataSetValue (
     UINT8                   Type,
     UINT32                  Index,
     ACPI_OPERAND_OBJECT     *Object,
     ACPI_WALK_STATE         *WalkState);
 
 #ifdef ACPI_OBSOLETE_FUNCTIONS
 ACPI_OBJECT_TYPE
 AcpiDsMethodDataGetType (
     UINT16                  Opcode,
     UINT32                  Index,
     ACPI_WALK_STATE         *WalkState);
 #endif
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiDsMethodDataInit
  *
  * PARAMETERS:  WalkState           - Current walk state object
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Initialize the data structures that hold the method's arguments
  *              and locals.  The data struct is an array of namespace nodes for
  *              each - this allows RefOf and DeRefOf to work properly for these
  *              special data types.
  *
  * NOTES:       WalkState fields are initialized to zero by the
  *              ACPI_ALLOCATE_ZEROED().
  *
  *              A pseudo-Namespace Node is assigned to each argument and local
  *              so that RefOf() can return a pointer to the Node.
  *
  ******************************************************************************/
 
 void
 AcpiDsMethodDataInit (
     ACPI_WALK_STATE         *WalkState)
 {
     UINT32                  i;
 
 
     ACPI_FUNCTION_TRACE (DsMethodDataInit);
 
 
     /* Init the method arguments */
 
     for (i = 0; i < ACPI_METHOD_NUM_ARGS; i++)
     {
         ACPI_MOVE_32_TO_32 (&WalkState->Arguments[i].Name, NAMEOF_ARG_NTE);
         WalkState->Arguments[i].Name.Integer |= (i << 24);
         WalkState->Arguments[i].DescriptorType = ACPI_DESC_TYPE_NAMED;
         WalkState->Arguments[i].Type = ACPI_TYPE_ANY;
         WalkState->Arguments[i].Flags =
             ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_ARG;
     }
 
     /* Init the method locals */
 
     for (i = 0; i < ACPI_METHOD_NUM_LOCALS; i++)
     {
         ACPI_MOVE_32_TO_32 (&WalkState->LocalVariables[i].Name, NAMEOF_LOCAL_NTE);
 
         WalkState->LocalVariables[i].Name.Integer |= (i << 24);
         WalkState->LocalVariables[i].DescriptorType = ACPI_DESC_TYPE_NAMED;
         WalkState->LocalVariables[i].Type = ACPI_TYPE_ANY;
         WalkState->LocalVariables[i].Flags =
             ANOBJ_END_OF_PEER_LIST | ANOBJ_METHOD_LOCAL;
     }
 
     return_VOID;
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiDsMethodDataDeleteAll
  *
  * PARAMETERS:  WalkState           - Current walk state object
  *
  * RETURN:      None
  *
  * DESCRIPTION: Delete method locals and arguments.  Arguments are only
  *              deleted if this method was called from another method.
  *
  ******************************************************************************/
 
 void
 AcpiDsMethodDataDeleteAll (
     ACPI_WALK_STATE         *WalkState)
 {
     UINT32                  Index;
 
 
     ACPI_FUNCTION_TRACE (DsMethodDataDeleteAll);
 
 
     /* Detach the locals */
 
     for (Index = 0; Index < ACPI_METHOD_NUM_LOCALS; Index++)
     {
         if (WalkState->LocalVariables[Index].Object)
         {
             ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Local%d=%p\n",
                     Index, WalkState->LocalVariables[Index].Object));
 
             /* Detach object (if present) and remove a reference */
 
             AcpiNsDetachObject (&WalkState->LocalVariables[Index]);
         }
     }
 
     /* Detach the arguments */
 
     for (Index = 0; Index < ACPI_METHOD_NUM_ARGS; Index++)
     {
         if (WalkState->Arguments[Index].Object)
         {
             ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Arg%d=%p\n",
                     Index, WalkState->Arguments[Index].Object));
 
             /* Detach object (if present) and remove a reference */
 
             AcpiNsDetachObject (&WalkState->Arguments[Index]);
         }
     }
 
     return_VOID;
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiDsMethodDataInitArgs
  *
  * PARAMETERS:  *Params         - Pointer to a parameter list for the method
  *              MaxParamCount   - The arg count for this method
  *              WalkState       - Current walk state object
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Initialize arguments for a method.  The parameter list is a list
  *              of ACPI operand objects, either null terminated or whose length
  *              is defined by MaxParamCount.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiDsMethodDataInitArgs (
     ACPI_OPERAND_OBJECT     **Params,
     UINT32                  MaxParamCount,
     ACPI_WALK_STATE         *WalkState)
 {
     ACPI_STATUS             Status;
     UINT32                  Index = 0;
 
 
     ACPI_FUNCTION_TRACE_PTR (DsMethodDataInitArgs, Params);
 
 
     if (!Params)
     {
         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "No param list passed to method\n"));
         return_ACPI_STATUS (AE_OK);
     }
 
     /* Copy passed parameters into the new method stack frame */
 
     while ((Index < ACPI_METHOD_NUM_ARGS) &&
            (Index < MaxParamCount)        &&
             Params[Index])
     {
         /*
          * A valid parameter.
          * Store the argument in the method/walk descriptor.
          * Do not copy the arg in order to implement call by reference
          */
         Status = AcpiDsMethodDataSetValue (ACPI_REFCLASS_ARG, Index,
                     Params[Index], WalkState);
         if (ACPI_FAILURE (Status))
         {
             return_ACPI_STATUS (Status);
         }
 
         Index++;
     }
 
     ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%d args passed to method\n", Index));
     return_ACPI_STATUS (AE_OK);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiDsMethodDataGetNode
  *
  * PARAMETERS:  Type                - Either ACPI_REFCLASS_LOCAL or
  *                                    ACPI_REFCLASS_ARG
  *              Index               - Which Local or Arg whose type to get
  *              WalkState           - Current walk state object
  *              Node                - Where the node is returned.
  *
  * RETURN:      Status and node
  *
  * DESCRIPTION: Get the Node associated with a local or arg.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiDsMethodDataGetNode (
     UINT8                   Type,
     UINT32                  Index,
     ACPI_WALK_STATE         *WalkState,
     ACPI_NAMESPACE_NODE     **Node)
 {
     ACPI_FUNCTION_TRACE (DsMethodDataGetNode);
 
 
     /*
      * Method Locals and Arguments are supported
      */
     switch (Type)
     {
     case ACPI_REFCLASS_LOCAL:
 
         if (Index > ACPI_METHOD_MAX_LOCAL)
         {
             ACPI_ERROR ((AE_INFO,
                 "Local index %d is invalid (max %d)",
                 Index, ACPI_METHOD_MAX_LOCAL));
             return_ACPI_STATUS (AE_AML_INVALID_INDEX);
         }
 
         /* Return a pointer to the pseudo-node */
 
         *Node = &WalkState->LocalVariables[Index];
         break;
 
     case ACPI_REFCLASS_ARG:
 
         if (Index > ACPI_METHOD_MAX_ARG)
         {
             ACPI_ERROR ((AE_INFO,
                 "Arg index %d is invalid (max %d)",
                 Index, ACPI_METHOD_MAX_ARG));
             return_ACPI_STATUS (AE_AML_INVALID_INDEX);
         }
 
         /* Return a pointer to the pseudo-node */
 
         *Node = &WalkState->Arguments[Index];
         break;
 
     default:
         ACPI_ERROR ((AE_INFO, "Type %d is invalid", Type));
         return_ACPI_STATUS (AE_TYPE);
     }
 
     return_ACPI_STATUS (AE_OK);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiDsMethodDataSetValue
  *
  * PARAMETERS:  Type                - Either ACPI_REFCLASS_LOCAL or
  *                                    ACPI_REFCLASS_ARG
  *              Index               - Which Local or Arg to get
  *              Object              - Object to be inserted into the stack entry
  *              WalkState           - Current walk state object
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Insert an object onto the method stack at entry Opcode:Index.
  *              Note: There is no "implicit conversion" for locals.
  *
  ******************************************************************************/
 
 static ACPI_STATUS
 AcpiDsMethodDataSetValue (
     UINT8                   Type,
     UINT32                  Index,
     ACPI_OPERAND_OBJECT     *Object,
     ACPI_WALK_STATE         *WalkState)
 {
     ACPI_STATUS             Status;
     ACPI_NAMESPACE_NODE     *Node;
 
 
     ACPI_FUNCTION_TRACE (DsMethodDataSetValue);
 
 
     ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
         "NewObj %p Type %2.2X, Refs=%d [%s]\n", Object,
         Type, Object->Common.ReferenceCount,
         AcpiUtGetTypeName (Object->Common.Type)));
 
     /* Get the namespace node for the arg/local */
 
     Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node);
     if (ACPI_FAILURE (Status))
     {
         return_ACPI_STATUS (Status);
     }
 
     /*
      * Increment ref count so object can't be deleted while installed.
      * NOTE: We do not copy the object in order to preserve the call by
      * reference semantics of ACPI Control Method invocation.
      * (See ACPI Specification 2.0C)
      */
     AcpiUtAddReference (Object);
 
     /* Install the object */
 
     Node->Object = Object;
     return_ACPI_STATUS (Status);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiDsMethodDataGetValue
  *
  * PARAMETERS:  Type                - Either ACPI_REFCLASS_LOCAL or
  *                                    ACPI_REFCLASS_ARG
  *              Index               - Which localVar or argument to get
  *              WalkState           - Current walk state object
  *              DestDesc            - Where Arg or Local value is returned
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Retrieve value of selected Arg or Local for this method
  *              Used only in AcpiExResolveToValue().
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiDsMethodDataGetValue (
     UINT8                   Type,
     UINT32                  Index,
     ACPI_WALK_STATE         *WalkState,
     ACPI_OPERAND_OBJECT     **DestDesc)
 {
     ACPI_STATUS             Status;
     ACPI_NAMESPACE_NODE     *Node;
     ACPI_OPERAND_OBJECT     *Object;
 
 
     ACPI_FUNCTION_TRACE (DsMethodDataGetValue);
 
 
     /* Validate the object descriptor */
 
     if (!DestDesc)
     {
         ACPI_ERROR ((AE_INFO, "Null object descriptor pointer"));
         return_ACPI_STATUS (AE_BAD_PARAMETER);
     }
 
     /* Get the namespace node for the arg/local */
 
     Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node);
     if (ACPI_FAILURE (Status))
     {
         return_ACPI_STATUS (Status);
     }
 
     /* Get the object from the node */
 
     Object = Node->Object;
 
     /* Examine the returned object, it must be valid. */
 
     if (!Object)
     {
         /*
          * Index points to uninitialized object.
          * This means that either 1) The expected argument was
          * not passed to the method, or 2) A local variable
          * was referenced by the method (via the ASL)
          * before it was initialized.  Either case is an error.
          */
 
         /* If slack enabled, init the LocalX/ArgX to an Integer of value zero */
 
         if (AcpiGbl_EnableInterpreterSlack)
         {
             Object = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER);
             if (!Object)
             {
                 return_ACPI_STATUS (AE_NO_MEMORY);
             }
 
             Object->Integer.Value = 0;
             Node->Object = Object;
         }
 
         /* Otherwise, return the error */
 
         else switch (Type)
         {
         case ACPI_REFCLASS_ARG:
 
             ACPI_ERROR ((AE_INFO,
                 "Uninitialized Arg[%d] at node %p",
                 Index, Node));
 
             return_ACPI_STATUS (AE_AML_UNINITIALIZED_ARG);
 
         case ACPI_REFCLASS_LOCAL:
 
             ACPI_ERROR ((AE_INFO,
                 "Uninitialized Local[%d] at node %p", Index, Node));
 
             return_ACPI_STATUS (AE_AML_UNINITIALIZED_LOCAL);
 
         default:
 
             ACPI_ERROR ((AE_INFO, "Not a Arg/Local opcode: %X", Type));
             return_ACPI_STATUS (AE_AML_INTERNAL);
         }
     }
 
     /*
      * The Index points to an initialized and valid object.
      * Return an additional reference to the object
      */
     *DestDesc = Object;
     AcpiUtAddReference (Object);
 
     return_ACPI_STATUS (AE_OK);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiDsMethodDataDeleteValue
  *
  * PARAMETERS:  Type                - Either ACPI_REFCLASS_LOCAL or
  *                                    ACPI_REFCLASS_ARG
  *              Index               - Which localVar or argument to delete
  *              WalkState           - Current walk state object
  *
  * RETURN:      None
  *
  * DESCRIPTION: Delete the entry at Opcode:Index.  Inserts
  *              a null into the stack slot after the object is deleted.
  *
  ******************************************************************************/
 
 static void
 AcpiDsMethodDataDeleteValue (
     UINT8                   Type,
     UINT32                  Index,
     ACPI_WALK_STATE         *WalkState)
 {
     ACPI_STATUS             Status;
     ACPI_NAMESPACE_NODE     *Node;
     ACPI_OPERAND_OBJECT     *Object;
 
 
     ACPI_FUNCTION_TRACE (DsMethodDataDeleteValue);
 
 
     /* Get the namespace node for the arg/local */
 
     Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node);
     if (ACPI_FAILURE (Status))
     {
         return_VOID;
     }
 
     /* Get the associated object */
 
     Object = AcpiNsGetAttachedObject (Node);
 
     /*
      * Undefine the Arg or Local by setting its descriptor
      * pointer to NULL. Locals/Args can contain both
      * ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs
      */
     Node->Object = NULL;
 
     if ((Object) &&
         (ACPI_GET_DESCRIPTOR_TYPE (Object) == ACPI_DESC_TYPE_OPERAND))
     {
         /*
          * There is a valid object.
          * Decrement the reference count by one to balance the
          * increment when the object was stored.
          */
         AcpiUtRemoveReference (Object);
     }
 
     return_VOID;
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiDsStoreObjectToLocal
  *
  * PARAMETERS:  Type                - Either ACPI_REFCLASS_LOCAL or
  *                                    ACPI_REFCLASS_ARG
  *              Index               - Which Local or Arg to set
  *              ObjDesc             - Value to be stored
  *              WalkState           - Current walk state
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Store a value in an Arg or Local.  The ObjDesc is installed
  *              as the new value for the Arg or Local and the reference count
  *              for ObjDesc is incremented.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiDsStoreObjectToLocal (
     UINT8                   Type,
     UINT32                  Index,
     ACPI_OPERAND_OBJECT     *ObjDesc,
     ACPI_WALK_STATE         *WalkState)
 {
     ACPI_STATUS             Status;
     ACPI_NAMESPACE_NODE     *Node;
     ACPI_OPERAND_OBJECT     *CurrentObjDesc;
     ACPI_OPERAND_OBJECT     *NewObjDesc;
 
 
     ACPI_FUNCTION_TRACE (DsStoreObjectToLocal);
     ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Type=%2.2X Index=%d Obj=%p\n",
         Type, Index, ObjDesc));
 
     /* Parameter validation */
 
     if (!ObjDesc)
     {
         return_ACPI_STATUS (AE_BAD_PARAMETER);
     }
 
     /* Get the namespace node for the arg/local */
 
     Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node);
     if (ACPI_FAILURE (Status))
     {
         return_ACPI_STATUS (Status);
     }
 
     CurrentObjDesc = AcpiNsGetAttachedObject (Node);
     if (CurrentObjDesc == ObjDesc)
     {
         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p already installed!\n",
             ObjDesc));
         return_ACPI_STATUS (Status);
     }
 
     /*
      * If the reference count on the object is more than one, we must
      * take a copy of the object before we store.  A reference count
      * of exactly 1 means that the object was just created during the
      * evaluation of an expression, and we can safely use it since it
      * is not used anywhere else.
      */
     NewObjDesc = ObjDesc;
     if (ObjDesc->Common.ReferenceCount > 1)
     {
         Status = AcpiUtCopyIobjectToIobject (ObjDesc, &NewObjDesc, WalkState);
         if (ACPI_FAILURE (Status))
         {
             return_ACPI_STATUS (Status);
         }
     }
 
     /*
      * If there is an object already in this slot, we either
      * have to delete it, or if this is an argument and there
      * is an object reference stored there, we have to do
      * an indirect store!
      */
     if (CurrentObjDesc)
     {
         /*
          * Check for an indirect store if an argument
          * contains an object reference (stored as an Node).
          * We don't allow this automatic dereferencing for
          * locals, since a store to a local should overwrite
          * anything there, including an object reference.
          *
          * If both Arg0 and Local0 contain RefOf (Local4):
          *
          * Store (1, Arg0)             - Causes indirect store to local4
          * Store (1, Local0)           - Stores 1 in local0, overwriting
          *                                  the reference to local4
          * Store (1, DeRefof (Local0)) - Causes indirect store to local4
          *
          * Weird, but true.
          */
         if (Type == ACPI_REFCLASS_ARG)
         {
             /*
              * If we have a valid reference object that came from RefOf(),
              * do the indirect store
              */
             if ((ACPI_GET_DESCRIPTOR_TYPE (CurrentObjDesc) == ACPI_DESC_TYPE_OPERAND) &&
                 (CurrentObjDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) &&
                 (CurrentObjDesc->Reference.Class == ACPI_REFCLASS_REFOF))
             {
                 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
                         "Arg (%p) is an ObjRef(Node), storing in node %p\n",
                         NewObjDesc, CurrentObjDesc));
 
                 /*
                  * Store this object to the Node (perform the indirect store)
                  * NOTE: No implicit conversion is performed, as per the ACPI
                  * specification rules on storing to Locals/Args.
                  */
                 Status = AcpiExStoreObjectToNode (NewObjDesc,
                             CurrentObjDesc->Reference.Object, WalkState,
                             ACPI_NO_IMPLICIT_CONVERSION);
 
                 /* Remove local reference if we copied the object above */
 
                 if (NewObjDesc != ObjDesc)
                 {
                     AcpiUtRemoveReference (NewObjDesc);
                 }
                 return_ACPI_STATUS (Status);
             }
         }
 
         /* Delete the existing object before storing the new one */
 
         AcpiDsMethodDataDeleteValue (Type, Index, WalkState);
     }
 
     /*
      * Install the Obj descriptor (*NewObjDesc) into
      * the descriptor for the Arg or Local.
      * (increments the object reference count by one)
      */
     Status = AcpiDsMethodDataSetValue (Type, Index, NewObjDesc, WalkState);
 
     /* Remove local reference if we copied the object above */
 
     if (NewObjDesc != ObjDesc)
     {
         AcpiUtRemoveReference (NewObjDesc);
     }
 
     return_ACPI_STATUS (Status);
 }
 
 
 #ifdef ACPI_OBSOLETE_FUNCTIONS
 /*******************************************************************************
  *
  * FUNCTION:    AcpiDsMethodDataGetType
  *
  * PARAMETERS:  Opcode              - Either AML_LOCAL_OP or AML_ARG_OP
  *              Index               - Which Local or Arg whose type to get
  *              WalkState           - Current walk state object
  *
  * RETURN:      Data type of current value of the selected Arg or Local
  *
  * DESCRIPTION: Get the type of the object stored in the Local or Arg
  *
  ******************************************************************************/
 
 ACPI_OBJECT_TYPE
 AcpiDsMethodDataGetType (
     UINT16                  Opcode,
     UINT32                  Index,
     ACPI_WALK_STATE         *WalkState)
 {
     ACPI_STATUS             Status;
     ACPI_NAMESPACE_NODE     *Node;
     ACPI_OPERAND_OBJECT     *Object;
 
 
     ACPI_FUNCTION_TRACE (DsMethodDataGetType);
 
 
     /* Get the namespace node for the arg/local */
 
     Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node);
     if (ACPI_FAILURE (Status))
     {
         return_VALUE ((ACPI_TYPE_NOT_FOUND));
     }
 
     /* Get the object */
 
     Object = AcpiNsGetAttachedObject (Node);
     if (!Object)
     {
         /* Uninitialized local/arg, return TYPE_ANY */
 
         return_VALUE (ACPI_TYPE_ANY);
     }
 
     /* Get the object type */
 
     return_VALUE (Object->Type);
 }
 #endif