FreeBSD/Linux Kernel Cross Reference
sys/contrib/dev/acpica/components/dispatcher/dsobject.c

     /******************************************************************************
      *
      * Module Name: dsobject - Dispatcher object management routines
      *
      *****************************************************************************/
     
     /******************************************************************************
      *
      * 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/acparser.h>
   #include <contrib/dev/acpica/include/amlcode.h>
   #include <contrib/dev/acpica/include/acdispat.h>
   #include <contrib/dev/acpica/include/acnamesp.h>
   #include <contrib/dev/acpica/include/acinterp.h>
   
   #define _COMPONENT          ACPI_DISPATCHER
           ACPI_MODULE_NAME    ("dsobject")
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsBuildInternalObject
    *
    * PARAMETERS:  WalkState       - Current walk state
    *              Op              - Parser object to be translated
    *              ObjDescPtr      - Where the ACPI internal object is returned
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Translate a parser Op object to the equivalent namespace object
    *              Simple objects are any objects other than a package object!
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiDsBuildInternalObject (
       ACPI_WALK_STATE         *WalkState,
       ACPI_PARSE_OBJECT       *Op,
       ACPI_OPERAND_OBJECT     **ObjDescPtr)
   {
       ACPI_OPERAND_OBJECT     *ObjDesc;
       ACPI_STATUS             Status;
   
   
       ACPI_FUNCTION_TRACE (DsBuildInternalObject);
   
   
       *ObjDescPtr = NULL;
       if (Op->Common.AmlOpcode == AML_INT_NAMEPATH_OP)
       {
           /*
            * This is a named object reference. If this name was
            * previously looked up in the namespace, it was stored in
            * this op. Otherwise, go ahead and look it up now
            */
           if (!Op->Common.Node)
           {
               /* Check if we are resolving a named reference within a package */
   
               if ((Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
                   (Op->Common.Parent->Common.AmlOpcode == AML_VARIABLE_PACKAGE_OP))
               {
                   /*
                    * We won't resolve package elements here, we will do this
                    * after all ACPI tables are loaded into the namespace. This
                    * behavior supports both forward references to named objects
                    * and external references to objects in other tables.
                    */
                   goto CreateNewObject;
               }
               else
               {
                   Status = AcpiNsLookup (WalkState->ScopeInfo,
                       Op->Common.Value.String,
                       ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
                       ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, NULL,
                       ACPI_CAST_INDIRECT_PTR (
                           ACPI_NAMESPACE_NODE, &(Op->Common.Node)));
                   if (ACPI_FAILURE (Status))
                   {
                       ACPI_ERROR_NAMESPACE (WalkState->ScopeInfo,
                           Op->Common.Value.String, Status);
                       return_ACPI_STATUS (Status);
                   }
               }
           }
       }
   
   CreateNewObject:
   
       /* Create and init a new internal ACPI object */
   
       ObjDesc = AcpiUtCreateInternalObject (
           (AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode))->ObjectType);
       if (!ObjDesc)
       {
           return_ACPI_STATUS (AE_NO_MEMORY);
       }
   
       Status = AcpiDsInitObjectFromOp (
           WalkState, Op, Op->Common.AmlOpcode, &ObjDesc);
       if (ACPI_FAILURE (Status))
       {
           AcpiUtRemoveReference (ObjDesc);
           return_ACPI_STATUS (Status);
       }
   
       /*
        * Handling for unresolved package reference elements.
        * These are elements that are namepaths.
        */
       if ((Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
           (Op->Common.Parent->Common.AmlOpcode == AML_VARIABLE_PACKAGE_OP))
       {
           ObjDesc->Reference.Resolved = TRUE;
   
           if ((Op->Common.AmlOpcode == AML_INT_NAMEPATH_OP) &&
               !ObjDesc->Reference.Node)
           {
               /*
                * Name was unresolved above.
                * Get the prefix node for later lookup
                */
               ObjDesc->Reference.Node = WalkState->ScopeInfo->Scope.Node;
               ObjDesc->Reference.Aml = Op->Common.Aml;
               ObjDesc->Reference.Resolved = FALSE;
           }
       }
   
       *ObjDescPtr = ObjDesc;
       return_ACPI_STATUS (Status);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsBuildInternalBufferObj
    *
    * PARAMETERS:  WalkState       - Current walk state
    *              Op              - Parser object to be translated
    *              BufferLength    - Length of the buffer
    *              ObjDescPtr      - Where the ACPI internal object is returned
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Translate a parser Op package object to the equivalent
    *              namespace object
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiDsBuildInternalBufferObj (
       ACPI_WALK_STATE         *WalkState,
       ACPI_PARSE_OBJECT       *Op,
       UINT32                  BufferLength,
       ACPI_OPERAND_OBJECT     **ObjDescPtr)
   {
       ACPI_PARSE_OBJECT       *Arg;
       ACPI_OPERAND_OBJECT     *ObjDesc;
       ACPI_PARSE_OBJECT       *ByteList;
       UINT32                  ByteListLength = 0;
   
   
       ACPI_FUNCTION_TRACE (DsBuildInternalBufferObj);
   
   
       /*
        * If we are evaluating a Named buffer object "Name (xxxx, Buffer)".
        * The buffer object already exists (from the NS node), otherwise it must
        * be created.
        */
       ObjDesc = *ObjDescPtr;
       if (!ObjDesc)
       {
           /* Create a new buffer object */
   
           ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_BUFFER);
           *ObjDescPtr = ObjDesc;
           if (!ObjDesc)
           {
               return_ACPI_STATUS (AE_NO_MEMORY);
           }
       }
   
       /*
        * Second arg is the buffer data (optional) ByteList can be either
        * individual bytes or a string initializer. In either case, a
        * ByteList appears in the AML.
        */
       Arg = Op->Common.Value.Arg;         /* skip first arg */
   
       ByteList = Arg->Named.Next;
       if (ByteList)
       {
           if (ByteList->Common.AmlOpcode != AML_INT_BYTELIST_OP)
           {
               ACPI_ERROR ((AE_INFO,
                   "Expecting bytelist, found AML opcode 0x%X in op %p",
                   ByteList->Common.AmlOpcode, ByteList));
   
               AcpiUtRemoveReference (ObjDesc);
               return (AE_TYPE);
           }
   
           ByteListLength = (UINT32) ByteList->Common.Value.Integer;
       }
   
       /*
        * The buffer length (number of bytes) will be the larger of:
        * 1) The specified buffer length and
        * 2) The length of the initializer byte list
        */
       ObjDesc->Buffer.Length = BufferLength;
       if (ByteListLength > BufferLength)
       {
           ObjDesc->Buffer.Length = ByteListLength;
       }
   
       /* Allocate the buffer */
   
       if (ObjDesc->Buffer.Length == 0)
       {
           ObjDesc->Buffer.Pointer = NULL;
           ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
               "Buffer defined with zero length in AML, creating\n"));
       }
       else
       {
           ObjDesc->Buffer.Pointer =
               ACPI_ALLOCATE_ZEROED (ObjDesc->Buffer.Length);
           if (!ObjDesc->Buffer.Pointer)
           {
               AcpiUtDeleteObjectDesc (ObjDesc);
               return_ACPI_STATUS (AE_NO_MEMORY);
           }
   
           /* Initialize buffer from the ByteList (if present) */
   
           if (ByteList)
           {
               memcpy (ObjDesc->Buffer.Pointer, ByteList->Named.Data,
                   ByteListLength);
           }
       }
   
       ObjDesc->Buffer.Flags |= AOPOBJ_DATA_VALID;
       Op->Common.Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, ObjDesc);
       return_ACPI_STATUS (AE_OK);
   }
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsCreateNode
    *
    * PARAMETERS:  WalkState       - Current walk state
    *              Node            - NS Node to be initialized
    *              Op              - Parser object to be translated
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Create the object to be associated with a namespace node
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiDsCreateNode (
       ACPI_WALK_STATE         *WalkState,
       ACPI_NAMESPACE_NODE     *Node,
       ACPI_PARSE_OBJECT       *Op)
   {
       ACPI_STATUS             Status;
       ACPI_OPERAND_OBJECT     *ObjDesc;
   
   
       ACPI_FUNCTION_TRACE_PTR (DsCreateNode, Op);
   
   
       /*
        * Because of the execution pass through the non-control-method
        * parts of the table, we can arrive here twice. Only init
        * the named object node the first time through
        */
       if (AcpiNsGetAttachedObject (Node))
       {
           return_ACPI_STATUS (AE_OK);
       }
   
       if (!Op->Common.Value.Arg)
       {
           /* No arguments, there is nothing to do */
   
           return_ACPI_STATUS (AE_OK);
       }
   
       /* Build an internal object for the argument(s) */
   
       Status = AcpiDsBuildInternalObject (
           WalkState, Op->Common.Value.Arg, &ObjDesc);
       if (ACPI_FAILURE (Status))
       {
           return_ACPI_STATUS (Status);
       }
   
       /* Re-type the object according to its argument */
   
       Node->Type = ObjDesc->Common.Type;
   
       /* Attach obj to node */
   
       Status = AcpiNsAttachObject (Node, ObjDesc, Node->Type);
   
       /* Remove local reference to the object */
   
       AcpiUtRemoveReference (ObjDesc);
       return_ACPI_STATUS (Status);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiDsInitObjectFromOp
    *
    * PARAMETERS:  WalkState       - Current walk state
    *              Op              - Parser op used to init the internal object
    *              Opcode          - AML opcode associated with the object
    *              RetObjDesc      - Namespace object to be initialized
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Initialize a namespace object from a parser Op and its
    *              associated arguments. The namespace object is a more compact
    *              representation of the Op and its arguments.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiDsInitObjectFromOp (
       ACPI_WALK_STATE         *WalkState,
       ACPI_PARSE_OBJECT       *Op,
       UINT16                  Opcode,
       ACPI_OPERAND_OBJECT     **RetObjDesc)
   {
       const ACPI_OPCODE_INFO  *OpInfo;
       ACPI_OPERAND_OBJECT     *ObjDesc;
       ACPI_STATUS             Status = AE_OK;
   
   
       ACPI_FUNCTION_TRACE (DsInitObjectFromOp);
   
   
       ObjDesc = *RetObjDesc;
       OpInfo = AcpiPsGetOpcodeInfo (Opcode);
       if (OpInfo->Class == AML_CLASS_UNKNOWN)
       {
           /* Unknown opcode */
   
           return_ACPI_STATUS (AE_TYPE);
       }
   
       /* Perform per-object initialization */
   
       switch (ObjDesc->Common.Type)
       {
       case ACPI_TYPE_BUFFER:
           /*
            * Defer evaluation of Buffer TermArg operand
            */
           ObjDesc->Buffer.Node = ACPI_CAST_PTR (
               ACPI_NAMESPACE_NODE, WalkState->Operands[0]);
           ObjDesc->Buffer.AmlStart = Op->Named.Data;
           ObjDesc->Buffer.AmlLength = Op->Named.Length;
           break;
   
       case ACPI_TYPE_PACKAGE:
           /*
            * Defer evaluation of Package TermArg operand and all
            * package elements. (01/2017): We defer the element
            * resolution to allow forward references from the package
            * in order to provide compatibility with other ACPI
            * implementations.
            */
           ObjDesc->Package.Node = ACPI_CAST_PTR (
               ACPI_NAMESPACE_NODE, WalkState->Operands[0]);
   
           if (!Op->Named.Data)
           {
               return_ACPI_STATUS (AE_OK);
           }
   
           ObjDesc->Package.AmlStart = Op->Named.Data;
           ObjDesc->Package.AmlLength = Op->Named.Length;
           break;
   
       case ACPI_TYPE_INTEGER:
   
           switch (OpInfo->Type)
           {
           case AML_TYPE_CONSTANT:
               /*
                * Resolve AML Constants here - AND ONLY HERE!
                * All constants are integers.
                * We mark the integer with a flag that indicates that it started
                * life as a constant -- so that stores to constants will perform
                * as expected (noop). ZeroOp is used as a placeholder for optional
                * target operands.
                */
               ObjDesc->Common.Flags = AOPOBJ_AML_CONSTANT;
   
               switch (Opcode)
               {
               case AML_ZERO_OP:
   
                   ObjDesc->Integer.Value = 0;
                   break;
   
               case AML_ONE_OP:
   
                   ObjDesc->Integer.Value = 1;
                   break;
   
               case AML_ONES_OP:
   
                   ObjDesc->Integer.Value = ACPI_UINT64_MAX;
   
                   /* Truncate value if we are executing from a 32-bit ACPI table */
   
                   (void) AcpiExTruncateFor32bitTable (ObjDesc);
                   break;
   
               case AML_REVISION_OP:
   
                   ObjDesc->Integer.Value = ACPI_CA_VERSION;
                   break;
   
               default:
   
                   ACPI_ERROR ((AE_INFO,
                       "Unknown constant opcode 0x%X", Opcode));
                   Status = AE_AML_OPERAND_TYPE;
                   break;
               }
               break;
   
           case AML_TYPE_LITERAL:
   
               ObjDesc->Integer.Value = Op->Common.Value.Integer;
   
               if (AcpiExTruncateFor32bitTable (ObjDesc))
               {
                   /* Warn if we found a 64-bit constant in a 32-bit table */
   
                   ACPI_WARNING ((AE_INFO,
                       "Truncated 64-bit constant found in 32-bit table: %8.8X%8.8X => %8.8X",
                       ACPI_FORMAT_UINT64 (Op->Common.Value.Integer),
                       (UINT32) ObjDesc->Integer.Value));
               }
               break;
   
           default:
   
               ACPI_ERROR ((AE_INFO, "Unknown Integer type 0x%X",
                   OpInfo->Type));
               Status = AE_AML_OPERAND_TYPE;
               break;
           }
           break;
   
       case ACPI_TYPE_STRING:
   
           ObjDesc->String.Pointer = Op->Common.Value.String;
           ObjDesc->String.Length = (UINT32) strlen (Op->Common.Value.String);
   
           /*
            * The string is contained in the ACPI table, don't ever try
            * to delete it
            */
           ObjDesc->Common.Flags |= AOPOBJ_STATIC_POINTER;
           break;
   
       case ACPI_TYPE_METHOD:
           break;
   
       case ACPI_TYPE_LOCAL_REFERENCE:
   
           switch (OpInfo->Type)
           {
           case AML_TYPE_LOCAL_VARIABLE:
   
               /* Local ID (0-7) is (AML opcode - base AML_FIRST_LOCAL_OP) */
   
               ObjDesc->Reference.Value = ((UINT32) Opcode) - AML_FIRST_LOCAL_OP;
               ObjDesc->Reference.Class = ACPI_REFCLASS_LOCAL;
   
               Status = AcpiDsMethodDataGetNode (ACPI_REFCLASS_LOCAL,
                   ObjDesc->Reference.Value, WalkState,
                   ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE,
                       &ObjDesc->Reference.Object));
               break;
   
           case AML_TYPE_METHOD_ARGUMENT:
   
               /* Arg ID (0-6) is (AML opcode - base AML_FIRST_ARG_OP) */
   
               ObjDesc->Reference.Value = ((UINT32) Opcode) - AML_FIRST_ARG_OP;
               ObjDesc->Reference.Class = ACPI_REFCLASS_ARG;
   
               Status = AcpiDsMethodDataGetNode (ACPI_REFCLASS_ARG,
                   ObjDesc->Reference.Value, WalkState,
                   ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE,
                       &ObjDesc->Reference.Object));
               break;
   
           default: /* Object name or Debug object */
   
               switch (Op->Common.AmlOpcode)
               {
               case AML_INT_NAMEPATH_OP:
   
                   /* Node was saved in Op */
   
                   ObjDesc->Reference.Node = Op->Common.Node;
                   ObjDesc->Reference.Class = ACPI_REFCLASS_NAME;
                   if (Op->Common.Node)
                   {
                       ObjDesc->Reference.Object = Op->Common.Node->Object;
                   }
                   break;
   
               case AML_DEBUG_OP:
   
                   ObjDesc->Reference.Class = ACPI_REFCLASS_DEBUG;
                   break;
   
               default:
   
                   ACPI_ERROR ((AE_INFO,
                       "Unimplemented reference type for AML opcode: 0x%4.4X", Opcode));
                   return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
               }
               break;
           }
           break;
   
       default:
   
           ACPI_ERROR ((AE_INFO, "Unimplemented data type: 0x%X",
               ObjDesc->Common.Type));
   
           Status = AE_AML_OPERAND_TYPE;
           break;
       }
   
       return_ACPI_STATUS (Status);
   }

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