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 /******************************************************************************
  *
  * Module Name: psargs - Parse AML opcode arguments
  *
  *****************************************************************************/
 
 /******************************************************************************
  *
  * 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 __PSARGS_C__
 
 #include "acpi.h"
 #include "accommon.h"
 #include "acparser.h"
 #include "amlcode.h"
 #include "acnamesp.h"
 #include "acdispat.h"
 
 #define _COMPONENT          ACPI_PARSER
         ACPI_MODULE_NAME    ("psargs")
 
 /* Local prototypes */
 
 static UINT32
 AcpiPsGetNextPackageLength (
     ACPI_PARSE_STATE        *ParserState);
 
 static ACPI_PARSE_OBJECT *
 AcpiPsGetNextField (
     ACPI_PARSE_STATE        *ParserState);
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiPsGetNextPackageLength
  *
  * PARAMETERS:  ParserState         - Current parser state object
  *
  * RETURN:      Decoded package length. On completion, the AML pointer points
  *              past the length byte or bytes.
  *
  * DESCRIPTION: Decode and return a package length field.
  *              Note: Largest package length is 28 bits, from ACPI specification
  *
  ******************************************************************************/
 
 static UINT32
 AcpiPsGetNextPackageLength (
     ACPI_PARSE_STATE        *ParserState)
 {
     UINT8                   *Aml = ParserState->Aml;
     UINT32                  PackageLength = 0;
     UINT32                  ByteCount;
     UINT8                   ByteZeroMask = 0x3F; /* Default [0:5] */
 
 
     ACPI_FUNCTION_TRACE (PsGetNextPackageLength);
 
 
     /*
      * Byte 0 bits [6:7] contain the number of additional bytes
      * used to encode the package length, either 0,1,2, or 3
      */
     ByteCount = (Aml[0] >> 6);
     ParserState->Aml += ((ACPI_SIZE) ByteCount + 1);
 
     /* Get bytes 3, 2, 1 as needed */
 
     while (ByteCount)
     {
         /*
          * Final bit positions for the package length bytes:
          *      Byte3->[20:27]
          *      Byte2->[12:19]
          *      Byte1->[04:11]
          *      Byte0->[00:03]
          */
         PackageLength |= (Aml[ByteCount] << ((ByteCount << 3) - 4));
 
         ByteZeroMask = 0x0F; /* Use bits [0:3] of byte 0 */
         ByteCount--;
     }
 
     /* Byte 0 is a special case, either bits [0:3] or [0:5] are used */
 
     PackageLength |= (Aml[0] & ByteZeroMask);
     return_UINT32 (PackageLength);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiPsGetNextPackageEnd
  *
  * PARAMETERS:  ParserState         - Current parser state object
  *
  * RETURN:      Pointer to end-of-package +1
  *
  * DESCRIPTION: Get next package length and return a pointer past the end of
  *              the package.  Consumes the package length field
  *
  ******************************************************************************/
 
 UINT8 *
 AcpiPsGetNextPackageEnd (
     ACPI_PARSE_STATE        *ParserState)
 {
     UINT8                   *Start = ParserState->Aml;
     UINT32                  PackageLength;
 
 
     ACPI_FUNCTION_TRACE (PsGetNextPackageEnd);
 
 
     /* Function below updates ParserState->Aml */
 
     PackageLength = AcpiPsGetNextPackageLength (ParserState);
 
     return_PTR (Start + PackageLength); /* end of package */
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiPsGetNextNamestring
  *
  * PARAMETERS:  ParserState         - Current parser state object
  *
  * RETURN:      Pointer to the start of the name string (pointer points into
  *              the AML.
  *
  * DESCRIPTION: Get next raw namestring within the AML stream.  Handles all name
  *              prefix characters.  Set parser state to point past the string.
  *              (Name is consumed from the AML.)
  *
  ******************************************************************************/
 
 char *
 AcpiPsGetNextNamestring (
     ACPI_PARSE_STATE        *ParserState)
 {
     UINT8                   *Start = ParserState->Aml;
     UINT8                   *End = ParserState->Aml;
 
 
     ACPI_FUNCTION_TRACE (PsGetNextNamestring);
 
 
     /* Point past any namestring prefix characters (backslash or carat) */
 
     while (AcpiPsIsPrefixChar (*End))
     {
         End++;
     }
 
     /* Decode the path prefix character */
 
     switch (*End)
     {
     case 0:
 
         /* NullName */
 
         if (End == Start)
         {
             Start = NULL;
         }
         End++;
         break;
 
     case AML_DUAL_NAME_PREFIX:
 
         /* Two name segments */
 
         End += 1 + (2 * ACPI_NAME_SIZE);
         break;
 
     case AML_MULTI_NAME_PREFIX_OP:
 
         /* Multiple name segments, 4 chars each, count in next byte */
 
         End += 2 + (*(End + 1) * ACPI_NAME_SIZE);
         break;
 
     default:
 
         /* Single name segment */
 
         End += ACPI_NAME_SIZE;
         break;
     }
 
     ParserState->Aml = End;
     return_PTR ((char *) Start);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiPsGetNextNamepath
  *
  * PARAMETERS:  ParserState         - Current parser state object
  *              Arg                 - Where the namepath will be stored
  *              ArgCount            - If the namepath points to a control method
  *                                    the method's argument is returned here.
  *              PossibleMethodCall  - Whether the namepath can possibly be the
  *                                    start of a method call
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Get next name (if method call, return # of required args).
  *              Names are looked up in the internal namespace to determine
  *              if the name represents a control method.  If a method
  *              is found, the number of arguments to the method is returned.
  *              This information is critical for parsing to continue correctly.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiPsGetNextNamepath (
     ACPI_WALK_STATE         *WalkState,
     ACPI_PARSE_STATE        *ParserState,
     ACPI_PARSE_OBJECT       *Arg,
     BOOLEAN                 PossibleMethodCall)
 {
     ACPI_STATUS             Status;
     char                    *Path;
     ACPI_PARSE_OBJECT       *NameOp;
     ACPI_OPERAND_OBJECT     *MethodDesc;
     ACPI_NAMESPACE_NODE     *Node;
     UINT8                   *Start = ParserState->Aml;
 
 
     ACPI_FUNCTION_TRACE (PsGetNextNamepath);
 
 
     Path = AcpiPsGetNextNamestring (ParserState);
     AcpiPsInitOp (Arg, AML_INT_NAMEPATH_OP);
 
     /* Null path case is allowed, just exit */
 
     if (!Path)
     {
         Arg->Common.Value.Name = Path;
         return_ACPI_STATUS (AE_OK);
     }
 
     /*
      * Lookup the name in the internal namespace, starting with the current
      * scope. We don't want to add anything new to the namespace here,
      * however, so we use MODE_EXECUTE.
      * Allow searching of the parent tree, but don't open a new scope -
      * we just want to lookup the object (must be mode EXECUTE to perform
      * the upsearch)
      */
     Status = AcpiNsLookup (WalkState->ScopeInfo, Path,
                 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
                 ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, NULL, &Node);
 
     /*
      * If this name is a control method invocation, we must
      * setup the method call
      */
     if (ACPI_SUCCESS (Status) &&
         PossibleMethodCall &&
         (Node->Type == ACPI_TYPE_METHOD))
     {
         if (WalkState->Opcode == AML_UNLOAD_OP)
         {
             /*
              * AcpiPsGetNextNamestring has increased the AML pointer,
              * so we need to restore the saved AML pointer for method call.
              */
             WalkState->ParserState.Aml = Start;
             WalkState->ArgCount = 1;
             AcpiPsInitOp (Arg, AML_INT_METHODCALL_OP);
             return_ACPI_STATUS (AE_OK);
         }
 
         /* This name is actually a control method invocation */
 
         MethodDesc = AcpiNsGetAttachedObject (Node);
         ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
             "Control Method - %p Desc %p Path=%p\n", Node, MethodDesc, Path));
 
         NameOp = AcpiPsAllocOp (AML_INT_NAMEPATH_OP);
         if (!NameOp)
         {
             return_ACPI_STATUS (AE_NO_MEMORY);
         }
 
         /* Change Arg into a METHOD CALL and attach name to it */
 
         AcpiPsInitOp (Arg, AML_INT_METHODCALL_OP);
         NameOp->Common.Value.Name = Path;
 
         /* Point METHODCALL/NAME to the METHOD Node */
 
         NameOp->Common.Node = Node;
         AcpiPsAppendArg (Arg, NameOp);
 
         if (!MethodDesc)
         {
             ACPI_ERROR ((AE_INFO,
                 "Control Method %p has no attached object",
                 Node));
             return_ACPI_STATUS (AE_AML_INTERNAL);
         }
 
         ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
             "Control Method - %p Args %X\n",
             Node, MethodDesc->Method.ParamCount));
 
         /* Get the number of arguments to expect */
 
         WalkState->ArgCount = MethodDesc->Method.ParamCount;
         return_ACPI_STATUS (AE_OK);
     }
 
     /*
      * Special handling if the name was not found during the lookup -
      * some NotFound cases are allowed
      */
     if (Status == AE_NOT_FOUND)
     {
         /* 1) NotFound is ok during load pass 1/2 (allow forward references) */
 
         if ((WalkState->ParseFlags & ACPI_PARSE_MODE_MASK) !=
                 ACPI_PARSE_EXECUTE)
         {
             Status = AE_OK;
         }
 
         /* 2) NotFound during a CondRefOf(x) is ok by definition */
 
         else if (WalkState->Op->Common.AmlOpcode == AML_COND_REF_OF_OP)
         {
             Status = AE_OK;
         }
 
         /*
          * 3) NotFound while building a Package is ok at this point, we
          * may flag as an error later if slack mode is not enabled.
          * (Some ASL code depends on allowing this behavior)
          */
         else if ((Arg->Common.Parent) &&
             ((Arg->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
              (Arg->Common.Parent->Common.AmlOpcode == AML_VAR_PACKAGE_OP)))
         {
             Status = AE_OK;
         }
     }
 
     /* Final exception check (may have been changed from code above) */
 
     if (ACPI_FAILURE (Status))
     {
         ACPI_ERROR_NAMESPACE (Path, Status);
 
         if ((WalkState->ParseFlags & ACPI_PARSE_MODE_MASK) ==
                 ACPI_PARSE_EXECUTE)
         {
             /* Report a control method execution error */
 
             Status = AcpiDsMethodError (Status, WalkState);
         }
     }
 
     /* Save the namepath */
 
     Arg->Common.Value.Name = Path;
     return_ACPI_STATUS (Status);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiPsGetNextSimpleArg
  *
  * PARAMETERS:  ParserState         - Current parser state object
  *              ArgType             - The argument type (AML_*_ARG)
  *              Arg                 - Where the argument is returned
  *
  * RETURN:      None
  *
  * DESCRIPTION: Get the next simple argument (constant, string, or namestring)
  *
  ******************************************************************************/
 
 void
 AcpiPsGetNextSimpleArg (
     ACPI_PARSE_STATE        *ParserState,
     UINT32                  ArgType,
     ACPI_PARSE_OBJECT       *Arg)
 {
     UINT32                  Length;
     UINT16                  Opcode;
     UINT8                   *Aml = ParserState->Aml;
 
 
     ACPI_FUNCTION_TRACE_U32 (PsGetNextSimpleArg, ArgType);
 
 
     switch (ArgType)
     {
     case ARGP_BYTEDATA:
 
         /* Get 1 byte from the AML stream */
 
         Opcode = AML_BYTE_OP;
         Arg->Common.Value.Integer = (ACPI_INTEGER) *Aml;
         Length = 1;
         break;
 
 
     case ARGP_WORDDATA:
 
         /* Get 2 bytes from the AML stream */
 
         Opcode = AML_WORD_OP;
         ACPI_MOVE_16_TO_64 (&Arg->Common.Value.Integer, Aml);
         Length = 2;
         break;
 
 
     case ARGP_DWORDDATA:
 
         /* Get 4 bytes from the AML stream */
 
         Opcode = AML_DWORD_OP;
         ACPI_MOVE_32_TO_64 (&Arg->Common.Value.Integer, Aml);
         Length = 4;
         break;
 
 
     case ARGP_QWORDDATA:
 
         /* Get 8 bytes from the AML stream */
 
         Opcode = AML_QWORD_OP;
         ACPI_MOVE_64_TO_64 (&Arg->Common.Value.Integer, Aml);
         Length = 8;
         break;
 
 
     case ARGP_CHARLIST:
 
         /* Get a pointer to the string, point past the string */
 
         Opcode = AML_STRING_OP;
         Arg->Common.Value.String = ACPI_CAST_PTR (char, Aml);
 
         /* Find the null terminator */
 
         Length = 0;
         while (Aml[Length])
         {
             Length++;
         }
         Length++;
         break;
 
 
     case ARGP_NAME:
     case ARGP_NAMESTRING:
 
         AcpiPsInitOp (Arg, AML_INT_NAMEPATH_OP);
         Arg->Common.Value.Name = AcpiPsGetNextNamestring (ParserState);
         return_VOID;
 
 
     default:
 
         ACPI_ERROR ((AE_INFO, "Invalid ArgType %X", ArgType));
         return_VOID;
     }
 
     AcpiPsInitOp (Arg, Opcode);
     ParserState->Aml += Length;
     return_VOID;
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiPsGetNextField
  *
  * PARAMETERS:  ParserState         - Current parser state object
  *
  * RETURN:      A newly allocated FIELD op
  *
  * DESCRIPTION: Get next field (NamedField, ReservedField, or AccessField)
  *
  ******************************************************************************/
 
 static ACPI_PARSE_OBJECT *
 AcpiPsGetNextField (
     ACPI_PARSE_STATE        *ParserState)
 {
     UINT32                  AmlOffset = (UINT32)
                                 ACPI_PTR_DIFF (ParserState->Aml,
                                                ParserState->AmlStart);
     ACPI_PARSE_OBJECT       *Field;
     UINT16                  Opcode;
     UINT32                  Name;
 
 
     ACPI_FUNCTION_TRACE (PsGetNextField);
 
 
     /* Determine field type */
 
     switch (ACPI_GET8 (ParserState->Aml))
     {
     default:
 
         Opcode = AML_INT_NAMEDFIELD_OP;
         break;
 
     case 0x00:
 
         Opcode = AML_INT_RESERVEDFIELD_OP;
         ParserState->Aml++;
         break;
 
     case 0x01:
 
         Opcode = AML_INT_ACCESSFIELD_OP;
         ParserState->Aml++;
         break;
     }
 
     /* Allocate a new field op */
 
     Field = AcpiPsAllocOp (Opcode);
     if (!Field)
     {
         return_PTR (NULL);
     }
 
     Field->Common.AmlOffset = AmlOffset;
 
     /* Decode the field type */
 
     switch (Opcode)
     {
     case AML_INT_NAMEDFIELD_OP:
 
         /* Get the 4-character name */
 
         ACPI_MOVE_32_TO_32 (&Name, ParserState->Aml);
         AcpiPsSetName (Field, Name);
         ParserState->Aml += ACPI_NAME_SIZE;
 
         /* Get the length which is encoded as a package length */
 
         Field->Common.Value.Size = AcpiPsGetNextPackageLength (ParserState);
         break;
 
 
     case AML_INT_RESERVEDFIELD_OP:
 
         /* Get the length which is encoded as a package length */
 
         Field->Common.Value.Size = AcpiPsGetNextPackageLength (ParserState);
         break;
 
 
     case AML_INT_ACCESSFIELD_OP:
 
         /*
          * Get AccessType and AccessAttrib and merge into the field Op
          * AccessType is first operand, AccessAttribute is second
          */
         Field->Common.Value.Integer = (((UINT32) ACPI_GET8 (ParserState->Aml) << 8));
         ParserState->Aml++;
         Field->Common.Value.Integer |= ACPI_GET8 (ParserState->Aml);
         ParserState->Aml++;
         break;
 
     default:
 
         /* Opcode was set in previous switch */
         break;
     }
 
     return_PTR (Field);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiPsGetNextArg
  *
  * PARAMETERS:  WalkState           - Current state
  *              ParserState         - Current parser state object
  *              ArgType             - The argument type (AML_*_ARG)
  *              ReturnArg           - Where the next arg is returned
  *
  * RETURN:      Status, and an op object containing the next argument.
  *
  * DESCRIPTION: Get next argument (including complex list arguments that require
  *              pushing the parser stack)
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiPsGetNextArg (
     ACPI_WALK_STATE         *WalkState,
     ACPI_PARSE_STATE        *ParserState,
     UINT32                  ArgType,
     ACPI_PARSE_OBJECT       **ReturnArg)
 {
     ACPI_PARSE_OBJECT       *Arg = NULL;
     ACPI_PARSE_OBJECT       *Prev = NULL;
     ACPI_PARSE_OBJECT       *Field;
     UINT32                  Subop;
     ACPI_STATUS             Status = AE_OK;
 
 
     ACPI_FUNCTION_TRACE_PTR (PsGetNextArg, ParserState);
 
 
     switch (ArgType)
     {
     case ARGP_BYTEDATA:
     case ARGP_WORDDATA:
     case ARGP_DWORDDATA:
     case ARGP_CHARLIST:
     case ARGP_NAME:
     case ARGP_NAMESTRING:
 
         /* Constants, strings, and namestrings are all the same size */
 
         Arg = AcpiPsAllocOp (AML_BYTE_OP);
         if (!Arg)
         {
             return_ACPI_STATUS (AE_NO_MEMORY);
         }
         AcpiPsGetNextSimpleArg (ParserState, ArgType, Arg);
         break;
 
 
     case ARGP_PKGLENGTH:
 
         /* Package length, nothing returned */
 
         ParserState->PkgEnd = AcpiPsGetNextPackageEnd (ParserState);
         break;
 
 
     case ARGP_FIELDLIST:
 
         if (ParserState->Aml < ParserState->PkgEnd)
         {
             /* Non-empty list */
 
             while (ParserState->Aml < ParserState->PkgEnd)
             {
                 Field = AcpiPsGetNextField (ParserState);
                 if (!Field)
                 {
                     return_ACPI_STATUS (AE_NO_MEMORY);
                 }
 
                 if (Prev)
                 {
                     Prev->Common.Next = Field;
                 }
                 else
                 {
                     Arg = Field;
                 }
                 Prev = Field;
             }
 
             /* Skip to End of byte data */
 
             ParserState->Aml = ParserState->PkgEnd;
         }
         break;
 
 
     case ARGP_BYTELIST:
 
         if (ParserState->Aml < ParserState->PkgEnd)
         {
             /* Non-empty list */
 
             Arg = AcpiPsAllocOp (AML_INT_BYTELIST_OP);
             if (!Arg)
             {
                 return_ACPI_STATUS (AE_NO_MEMORY);
             }
 
             /* Fill in bytelist data */
 
             Arg->Common.Value.Size = (UINT32)
                 ACPI_PTR_DIFF (ParserState->PkgEnd, ParserState->Aml);
             Arg->Named.Data = ParserState->Aml;
 
             /* Skip to End of byte data */
 
             ParserState->Aml = ParserState->PkgEnd;
         }
         break;
 
 
     case ARGP_TARGET:
     case ARGP_SUPERNAME:
     case ARGP_SIMPLENAME:
 
         Subop = AcpiPsPeekOpcode (ParserState);
         if (Subop == 0                  ||
             AcpiPsIsLeadingChar (Subop) ||
             AcpiPsIsPrefixChar (Subop))
         {
             /* NullName or NameString */
 
             Arg = AcpiPsAllocOp (AML_INT_NAMEPATH_OP);
             if (!Arg)
             {
                 return_ACPI_STATUS (AE_NO_MEMORY);
             }
 
             /* To support SuperName arg of Unload */
 
             if (WalkState->Opcode == AML_UNLOAD_OP)
             {
                 Status = AcpiPsGetNextNamepath (WalkState, ParserState, Arg, 1);
 
                 /*
                  * If the SuperName arg of Unload is a method call,
                  * we have restored the AML pointer, just free this Arg
                  */
                 if (Arg->Common.AmlOpcode == AML_INT_METHODCALL_OP)
                 {
                     AcpiPsFreeOp (Arg);
                     Arg = NULL;
                 }
             }
             else
             {
                 Status = AcpiPsGetNextNamepath (WalkState, ParserState, Arg, 0);
             }
         }
         else
         {
             /* Single complex argument, nothing returned */
 
             WalkState->ArgCount = 1;
         }
         break;
 
 
     case ARGP_DATAOBJ:
     case ARGP_TERMARG:
 
         /* Single complex argument, nothing returned */
 
         WalkState->ArgCount = 1;
         break;
 
 
     case ARGP_DATAOBJLIST:
     case ARGP_TERMLIST:
     case ARGP_OBJLIST:
 
         if (ParserState->Aml < ParserState->PkgEnd)
         {
             /* Non-empty list of variable arguments, nothing returned */
 
             WalkState->ArgCount = ACPI_VAR_ARGS;
         }
         break;
 
 
     default:
 
         ACPI_ERROR ((AE_INFO, "Invalid ArgType: %X", ArgType));
         Status = AE_AML_OPERAND_TYPE;
         break;
     }
 
     *ReturnArg = Arg;
     return_ACPI_STATUS (Status);
 }