FreeBSD/Linux Kernel Cross Reference
sys/contrib/dev/acpica/components/executer/exresolv.c

     /******************************************************************************
      *
      * Module Name: exresolv - AML Interpreter object resolution
      *
      *****************************************************************************/
     
     /******************************************************************************
      *
      * 1. Copyright Notice
     *
     * Some or all of this work - Copyright (c) 1999 - 2022, Intel Corp.
     * All rights reserved.
     *
     * 2. License
     *
     * 2.1. This is your license from Intel Corp. under its intellectual property
     * rights. You may have additional license terms from the party that provided
     * you this software, covering your right to use that party's intellectual
     * property rights.
     *
     * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
     * copy of the source code appearing in this file ("Covered Code") an
     * irrevocable, perpetual, worldwide license under Intel's copyrights in the
     * base code distributed originally by Intel ("Original Intel Code") to copy,
     * make derivatives, distribute, use and display any portion of the Covered
     * Code in any form, with the right to sublicense such rights; and
     *
     * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
     * license (with the right to sublicense), under only those claims of Intel
     * patents that are infringed by the Original Intel Code, to make, use, sell,
     * offer to sell, and import the Covered Code and derivative works thereof
     * solely to the minimum extent necessary to exercise the above copyright
     * license, and in no event shall the patent license extend to any additions
     * to or modifications of the Original Intel Code. No other license or right
     * is granted directly or by implication, estoppel or otherwise;
     *
     * The above copyright and patent license is granted only if the following
     * conditions are met:
     *
     * 3. Conditions
     *
     * 3.1. Redistribution of Source with Rights to Further Distribute Source.
     * Redistribution of source code of any substantial portion of the Covered
     * Code or modification with rights to further distribute source must include
     * the above Copyright Notice, the above License, this list of Conditions,
     * and the following Disclaimer and Export Compliance provision. In addition,
     * Licensee must cause all Covered Code to which Licensee contributes to
     * contain a file documenting the changes Licensee made to create that Covered
     * Code and the date of any change. Licensee must include in that file the
     * documentation of any changes made by any predecessor Licensee. Licensee
     * must include a prominent statement that the modification is derived,
     * directly or indirectly, from Original Intel Code.
     *
     * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
     * Redistribution of source code of any substantial portion of the Covered
     * Code or modification without rights to further distribute source must
     * include the following Disclaimer and Export Compliance provision in the
     * documentation and/or other materials provided with distribution. In
     * addition, Licensee may not authorize further sublicense of source of any
     * portion of the Covered Code, and must include terms to the effect that the
     * license from Licensee to its licensee is limited to the intellectual
     * property embodied in the software Licensee provides to its licensee, and
     * not to intellectual property embodied in modifications its licensee may
     * make.
     *
     * 3.3. Redistribution of Executable. Redistribution in executable form of any
     * substantial portion of the Covered Code or modification must reproduce the
     * above Copyright Notice, and the following Disclaimer and Export Compliance
     * provision in the documentation and/or other materials provided with the
     * distribution.
     *
     * 3.4. Intel retains all right, title, and interest in and to the Original
     * Intel Code.
     *
     * 3.5. Neither the name Intel nor any other trademark owned or controlled by
     * Intel shall be used in advertising or otherwise to promote the sale, use or
     * other dealings in products derived from or relating to the Covered Code
     * without prior written authorization from Intel.
     *
     * 4. Disclaimer and Export Compliance
     *
     * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
     * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
     * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
     * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
     * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
     * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
     * PARTICULAR PURPOSE.
     *
     * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
     * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
     * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
     * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
     * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
     * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
     * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
     * LIMITED REMEDY.
     *
     * 4.3. Licensee shall not export, either directly or indirectly, any of this
    * software or system incorporating such software without first obtaining any
    * required license or other approval from the U. S. Department of Commerce or
    * any other agency or department of the United States Government. In the
    * event Licensee exports any such software from the United States or
    * re-exports any such software from a foreign destination, Licensee shall
    * ensure that the distribution and export/re-export of the software is in
    * compliance with all laws, regulations, orders, or other restrictions of the
    * U.S. Export Administration Regulations. Licensee agrees that neither it nor
    * any of its subsidiaries will export/re-export any technical data, process,
    * software, or service, directly or indirectly, to any country for which the
    * United States government or any agency thereof requires an export license,
    * other governmental approval, or letter of assurance, without first obtaining
    * such license, approval or letter.
    *
    *****************************************************************************
    *
    * Alternatively, you may choose to be licensed under the terms of the
    * following license:
    *
    * Redistribution and use in source and binary forms, with or without
    * modification, are permitted provided that the following conditions
    * are met:
    * 1. Redistributions of source code must retain the above copyright
    *    notice, this list of conditions, and the following disclaimer,
    *    without modification.
    * 2. Redistributions in binary form must reproduce at minimum a disclaimer
    *    substantially similar to the "NO WARRANTY" disclaimer below
    *    ("Disclaimer") and any redistribution must be conditioned upon
    *    including a substantially similar Disclaimer requirement for further
    *    binary redistribution.
    * 3. Neither the names of the above-listed copyright holders nor the names
    *    of any contributors may be used to endorse or promote products derived
    *    from this software without specific prior written permission.
    *
    * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    *
    * Alternatively, you may choose to be licensed under the terms of the
    * GNU General Public License ("GPL") version 2 as published by the Free
    * Software Foundation.
    *
    *****************************************************************************/
   
   #include <contrib/dev/acpica/include/acpi.h>
   #include <contrib/dev/acpica/include/accommon.h>
   #include <contrib/dev/acpica/include/amlcode.h>
   #include <contrib/dev/acpica/include/acdispat.h>
   #include <contrib/dev/acpica/include/acinterp.h>
   #include <contrib/dev/acpica/include/acnamesp.h>
   
   
   #define _COMPONENT          ACPI_EXECUTER
           ACPI_MODULE_NAME    ("exresolv")
   
   /* Local prototypes */
   
   static ACPI_STATUS
   AcpiExResolveObjectToValue (
       ACPI_OPERAND_OBJECT     **StackPtr,
       ACPI_WALK_STATE         *WalkState);
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiExResolveToValue
    *
    * PARAMETERS:  **StackPtr          - Points to entry on ObjStack, which can
    *                                    be either an (ACPI_OPERAND_OBJECT *)
    *                                    or an ACPI_HANDLE.
    *              WalkState           - Current method state
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Convert Reference objects to values
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiExResolveToValue (
       ACPI_OPERAND_OBJECT     **StackPtr,
       ACPI_WALK_STATE         *WalkState)
   {
       ACPI_STATUS             Status;
   
   
       ACPI_FUNCTION_TRACE_PTR (ExResolveToValue, StackPtr);
   
   
       if (!StackPtr || !*StackPtr)
       {
           ACPI_ERROR ((AE_INFO, "Internal - null pointer"));
           return_ACPI_STATUS (AE_AML_NO_OPERAND);
       }
   
       /*
        * The entity pointed to by the StackPtr can be either
        * 1) A valid ACPI_OPERAND_OBJECT, or
        * 2) A ACPI_NAMESPACE_NODE (NamedObj)
        */
       if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_OPERAND)
       {
           Status = AcpiExResolveObjectToValue (StackPtr, WalkState);
           if (ACPI_FAILURE (Status))
           {
               return_ACPI_STATUS (Status);
           }
   
           if (!*StackPtr)
           {
               ACPI_ERROR ((AE_INFO, "Internal - null pointer"));
               return_ACPI_STATUS (AE_AML_NO_OPERAND);
           }
       }
   
       /*
        * Object on the stack may have changed if AcpiExResolveObjectToValue()
        * was called (i.e., we can't use an _else_ here.)
        */
       if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_NAMED)
       {
           Status = AcpiExResolveNodeToValue (
               ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE, StackPtr),
               WalkState);
           if (ACPI_FAILURE (Status))
           {
               return_ACPI_STATUS (Status);
           }
       }
   
       ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Resolved object %p\n", *StackPtr));
       return_ACPI_STATUS (AE_OK);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiExResolveObjectToValue
    *
    * PARAMETERS:  StackPtr        - Pointer to an internal object
    *              WalkState       - Current method state
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Retrieve the value from an internal object. The Reference type
    *              uses the associated AML opcode to determine the value.
    *
    ******************************************************************************/
   
   static ACPI_STATUS
   AcpiExResolveObjectToValue (
       ACPI_OPERAND_OBJECT     **StackPtr,
       ACPI_WALK_STATE         *WalkState)
   {
       ACPI_STATUS             Status = AE_OK;
       ACPI_OPERAND_OBJECT     *StackDesc;
       ACPI_OPERAND_OBJECT     *ObjDesc = NULL;
       UINT8                   RefType;
   
   
       ACPI_FUNCTION_TRACE (ExResolveObjectToValue);
   
   
       StackDesc = *StackPtr;
   
       /* This is an object of type ACPI_OPERAND_OBJECT */
   
       switch (StackDesc->Common.Type)
       {
       case ACPI_TYPE_LOCAL_REFERENCE:
   
           RefType = StackDesc->Reference.Class;
   
           switch (RefType)
           {
           case ACPI_REFCLASS_LOCAL:
           case ACPI_REFCLASS_ARG:
               /*
                * Get the local from the method's state info
                * Note: this increments the local's object reference count
                */
               Status = AcpiDsMethodDataGetValue (RefType,
                   StackDesc->Reference.Value, WalkState, &ObjDesc);
               if (ACPI_FAILURE (Status))
               {
                   return_ACPI_STATUS (Status);
               }
   
               ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Arg/Local %X] ValueObj is %p\n",
                   StackDesc->Reference.Value, ObjDesc));
   
               /*
                * Now we can delete the original Reference Object and
                * replace it with the resolved value
                */
               AcpiUtRemoveReference (StackDesc);
               *StackPtr = ObjDesc;
               break;
   
           case ACPI_REFCLASS_INDEX:
   
               switch (StackDesc->Reference.TargetType)
               {
               case ACPI_TYPE_BUFFER_FIELD:
   
                   /* Just return - do not dereference */
                   break;
   
               case ACPI_TYPE_PACKAGE:
   
                   /* If method call or CopyObject - do not dereference */
   
                   if ((WalkState->Opcode == AML_INT_METHODCALL_OP) ||
                       (WalkState->Opcode == AML_COPY_OBJECT_OP))
                   {
                       break;
                   }
   
                   /* Otherwise, dereference the PackageIndex to a package element */
   
                   ObjDesc = *StackDesc->Reference.Where;
                   if (ObjDesc)
                   {
                       /*
                        * Valid object descriptor, copy pointer to return value
                        * (i.e., dereference the package index)
                        * Delete the ref object, increment the returned object
                        */
                       AcpiUtAddReference (ObjDesc);
                       *StackPtr = ObjDesc;
                   }
                   else
                   {
                       /*
                        * A NULL object descriptor means an uninitialized element of
                        * the package, can't dereference it
                        */
                       ACPI_ERROR ((AE_INFO,
                           "Attempt to dereference an Index to "
                           "NULL package element Idx=%p",
                           StackDesc));
                       Status = AE_AML_UNINITIALIZED_ELEMENT;
                   }
                   break;
   
               default:
   
                   /* Invalid reference object */
   
                   ACPI_ERROR ((AE_INFO,
                       "Unknown TargetType 0x%X in Index/Reference object %p",
                       StackDesc->Reference.TargetType, StackDesc));
                   Status = AE_AML_INTERNAL;
                   break;
               }
               break;
   
           case ACPI_REFCLASS_REFOF:
           case ACPI_REFCLASS_DEBUG:
           case ACPI_REFCLASS_TABLE:
   
               /* Just leave the object as-is, do not dereference */
   
               break;
   
           case ACPI_REFCLASS_NAME:   /* Reference to a named object */
   
               /* Dereference the name */
   
               if ((StackDesc->Reference.Node->Type == ACPI_TYPE_DEVICE) ||
                   (StackDesc->Reference.Node->Type == ACPI_TYPE_THERMAL))
               {
                   /* These node types do not have 'real' subobjects */
   
                   *StackPtr = (void *) StackDesc->Reference.Node;
               }
               else
               {
                   /* Get the object pointed to by the namespace node */
   
                   *StackPtr = (StackDesc->Reference.Node)->Object;
                   AcpiUtAddReference (*StackPtr);
               }
   
               AcpiUtRemoveReference (StackDesc);
               break;
   
           default:
   
               ACPI_ERROR ((AE_INFO,
                   "Unknown Reference type 0x%X in %p",
                   RefType, StackDesc));
               Status = AE_AML_INTERNAL;
               break;
           }
           break;
   
       case ACPI_TYPE_BUFFER:
   
           Status = AcpiDsGetBufferArguments (StackDesc);
           break;
   
       case ACPI_TYPE_PACKAGE:
   
           Status = AcpiDsGetPackageArguments (StackDesc);
           break;
   
       case ACPI_TYPE_BUFFER_FIELD:
       case ACPI_TYPE_LOCAL_REGION_FIELD:
       case ACPI_TYPE_LOCAL_BANK_FIELD:
       case ACPI_TYPE_LOCAL_INDEX_FIELD:
   
           ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
               "FieldRead SourceDesc=%p Type=%X\n",
               StackDesc, StackDesc->Common.Type));
   
           Status = AcpiExReadDataFromField (WalkState, StackDesc, &ObjDesc);
   
           /* Remove a reference to the original operand, then override */
   
           AcpiUtRemoveReference (*StackPtr);
           *StackPtr = (void *) ObjDesc;
           break;
   
       default:
   
           break;
       }
   
       return_ACPI_STATUS (Status);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiExResolveMultiple
    *
    * PARAMETERS:  WalkState           - Current state (contains AML opcode)
    *              Operand             - Starting point for resolution
    *              ReturnType          - Where the object type is returned
    *              ReturnDesc          - Where the resolved object is returned
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Return the base object and type. Traverse a reference list if
    *              necessary to get to the base object.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiExResolveMultiple (
       ACPI_WALK_STATE         *WalkState,
       ACPI_OPERAND_OBJECT     *Operand,
       ACPI_OBJECT_TYPE        *ReturnType,
       ACPI_OPERAND_OBJECT     **ReturnDesc)
   {
       ACPI_OPERAND_OBJECT     *ObjDesc = ACPI_CAST_PTR (void, Operand);
       ACPI_NAMESPACE_NODE     *Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Operand);
       ACPI_OBJECT_TYPE        Type;
       ACPI_STATUS             Status;
   
   
       ACPI_FUNCTION_TRACE (AcpiExResolveMultiple);
   
   
       /* Operand can be either a namespace node or an operand descriptor */
   
       switch (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc))
       {
       case ACPI_DESC_TYPE_OPERAND:
   
           Type = ObjDesc->Common.Type;
           break;
   
       case ACPI_DESC_TYPE_NAMED:
   
           Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type;
           ObjDesc = AcpiNsGetAttachedObject (Node);
   
           /* If we had an Alias node, use the attached object for type info */
   
           if (Type == ACPI_TYPE_LOCAL_ALIAS)
           {
               Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type;
               ObjDesc = AcpiNsGetAttachedObject (
                   (ACPI_NAMESPACE_NODE *) ObjDesc);
           }
   
           switch (Type)
           {
           case ACPI_TYPE_DEVICE:
           case ACPI_TYPE_THERMAL:
   
               /* These types have no attached subobject */
               break;
   
           default:
   
               /* All other types require a subobject */
   
               if (!ObjDesc)
               {
                   ACPI_ERROR ((AE_INFO,
                       "[%4.4s] Node is unresolved or uninitialized",
                       AcpiUtGetNodeName (Node)));
                   return_ACPI_STATUS (AE_AML_UNINITIALIZED_NODE);
               }
               break;
           }
           break;
   
       default:
           return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
       }
   
       /* If type is anything other than a reference, we are done */
   
       if (Type != ACPI_TYPE_LOCAL_REFERENCE)
       {
           goto Exit;
       }
   
       /*
        * For reference objects created via the RefOf, Index, or Load/LoadTable
        * operators, we need to get to the base object (as per the ACPI
        * specification of the ObjectType and SizeOf operators). This means
        * traversing the list of possibly many nested references.
        */
       while (ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE)
       {
           switch (ObjDesc->Reference.Class)
           {
           case ACPI_REFCLASS_REFOF:
           case ACPI_REFCLASS_NAME:
   
               /* Dereference the reference pointer */
   
               if (ObjDesc->Reference.Class == ACPI_REFCLASS_REFOF)
               {
                   Node = ObjDesc->Reference.Object;
               }
               else /* AML_INT_NAMEPATH_OP */
               {
                   Node = ObjDesc->Reference.Node;
               }
   
               /* All "References" point to a NS node */
   
               if (ACPI_GET_DESCRIPTOR_TYPE (Node) != ACPI_DESC_TYPE_NAMED)
               {
                   ACPI_ERROR ((AE_INFO,
                       "Not a namespace node %p [%s]",
                       Node, AcpiUtGetDescriptorName (Node)));
                   return_ACPI_STATUS (AE_AML_INTERNAL);
               }
   
               /* Get the attached object */
   
               ObjDesc = AcpiNsGetAttachedObject (Node);
               if (!ObjDesc)
               {
                   /* No object, use the NS node type */
   
                   Type = AcpiNsGetType (Node);
                   goto Exit;
               }
   
               /* Check for circular references */
   
               if (ObjDesc == Operand)
               {
                   return_ACPI_STATUS (AE_AML_CIRCULAR_REFERENCE);
               }
               break;
   
           case ACPI_REFCLASS_INDEX:
   
               /* Get the type of this reference (index into another object) */
   
               Type = ObjDesc->Reference.TargetType;
               if (Type != ACPI_TYPE_PACKAGE)
               {
                   goto Exit;
               }
   
               /*
                * The main object is a package, we want to get the type
                * of the individual package element that is referenced by
                * the index.
                *
                * This could of course in turn be another reference object.
                */
               ObjDesc = *(ObjDesc->Reference.Where);
               if (!ObjDesc)
               {
                   /* NULL package elements are allowed */
   
                   Type = 0; /* Uninitialized */
                   goto Exit;
               }
               break;
   
           case ACPI_REFCLASS_TABLE:
   
               Type = ACPI_TYPE_DDB_HANDLE;
               goto Exit;
   
           case ACPI_REFCLASS_LOCAL:
           case ACPI_REFCLASS_ARG:
   
               if (ReturnDesc)
               {
                   Status = AcpiDsMethodDataGetValue (ObjDesc->Reference.Class,
                       ObjDesc->Reference.Value, WalkState, &ObjDesc);
                   if (ACPI_FAILURE (Status))
                   {
                       return_ACPI_STATUS (Status);
                   }
                   AcpiUtRemoveReference (ObjDesc);
               }
               else
               {
                   Status = AcpiDsMethodDataGetNode (ObjDesc->Reference.Class,
                       ObjDesc->Reference.Value, WalkState, &Node);
                   if (ACPI_FAILURE (Status))
                   {
                       return_ACPI_STATUS (Status);
                   }
   
                   ObjDesc = AcpiNsGetAttachedObject (Node);
                   if (!ObjDesc)
                   {
                       Type = ACPI_TYPE_ANY;
                       goto Exit;
                   }
               }
               break;
   
           case ACPI_REFCLASS_DEBUG:
   
               /* The Debug Object is of type "DebugObject" */
   
               Type = ACPI_TYPE_DEBUG_OBJECT;
               goto Exit;
   
           default:
   
               ACPI_ERROR ((AE_INFO,
                   "Unknown Reference Class 0x%2.2X",
                   ObjDesc->Reference.Class));
               return_ACPI_STATUS (AE_AML_INTERNAL);
           }
       }
   
       /*
        * Now we are guaranteed to have an object that has not been created
        * via the RefOf or Index operators.
        */
       Type = ObjDesc->Common.Type;
   
   
   Exit:
       /* Convert internal types to external types */
   
       switch (Type)
       {
       case ACPI_TYPE_LOCAL_REGION_FIELD:
       case ACPI_TYPE_LOCAL_BANK_FIELD:
       case ACPI_TYPE_LOCAL_INDEX_FIELD:
   
           Type = ACPI_TYPE_FIELD_UNIT;
           break;
   
       case ACPI_TYPE_LOCAL_SCOPE:
   
           /* Per ACPI Specification, Scope is untyped */
   
           Type = ACPI_TYPE_ANY;
           break;
   
       default:
   
           /* No change to Type required */
   
           break;
       }
   
       *ReturnType = Type;
       if (ReturnDesc)
       {
           *ReturnDesc = ObjDesc;
       }
       return_ACPI_STATUS (AE_OK);
   }

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