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

 *

 * Module Name: psargs - Parse AML opcode arguments

 *

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

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

 *

 * 1. Copyright Notice

 *

 * Some or all of this work - Copyright (c) 1999 - 2011, Intel Corp.

 * All rights reserved.

 *

 * 2. License

 *

 * 2.1. This is your license from Intel Corp. under its intellectual property

 * rights.  You may have additional license terms from the party that provided

 * you this software, covering your right to use that party's intellectual

 * property rights.

 *

 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a

 * copy of the source code appearing in this file ("Covered Code") an

 * irrevocable, perpetual, worldwide license under Intel's copyrights in the

 * base code distributed originally by Intel ("Original Intel Code") to copy,

 * make derivatives, distribute, use and display any portion of the Covered

 * Code in any form, with the right to sublicense such rights; and

 *

 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent

 * license (with the right to sublicense), under only those claims of Intel

 * patents that are infringed by the Original Intel Code, to make, use, sell,

 * offer to sell, and import the Covered Code and derivative works thereof

 * solely to the minimum extent necessary to exercise the above copyright

 * license, and in no event shall the patent license extend to any additions

 * to or modifications of the Original Intel Code.  No other license or right

 * is granted directly or by implication, estoppel or otherwise;

 *

 * The above copyright and patent license is granted only if the following

 * conditions are met:

 *

 * 3. Conditions

 *

 * 3.1. Redistribution of Source with Rights to Further Distribute Source.

 * Redistribution of source code of any substantial portion of the Covered

 * Code or modification with rights to further distribute source must include

 * the above Copyright Notice, the above License, this list of Conditions,

 * and the following Disclaimer and Export Compliance provision.  In addition,

 * Licensee must cause all Covered Code to which Licensee contributes to

 * contain a file documenting the changes Licensee made to create that Covered

 * Code and the date of any change.  Licensee must include in that file the

 * documentation of any changes made by any predecessor Licensee.  Licensee

 * must include a prominent statement that the modification is derived,

 * directly or indirectly, from Original Intel Code.

 *

 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.

 * Redistribution of source code of any substantial portion of the Covered

 * Code or modification without rights to further distribute source must

 * include the following Disclaimer and Export Compliance provision in the

 * documentation and/or other materials provided with distribution.  In

 * addition, Licensee may not authorize further sublicense of source of any

 * portion of the Covered Code, and must include terms to the effect that the

 * license from Licensee to its licensee is limited to the intellectual

 * property embodied in the software Licensee provides to its licensee, and

 * not to intellectual property embodied in modifications its licensee may

 * make.

 *

 * 3.3. Redistribution of Executable. Redistribution in executable form of any

 * substantial portion of the Covered Code or modification must reproduce the

 * above Copyright Notice, and the following Disclaimer and Export Compliance

 * provision in the documentation and/or other materials provided with the

 * distribution.

 *

 * 3.4. Intel retains all right, title, and interest in and to the Original

 * Intel Code.

 *

 * 3.5. Neither the name Intel nor any other trademark owned or controlled by

 * Intel shall be used in advertising or otherwise to promote the sale, use or

 * other dealings in products derived from or relating to the Covered Code

 * without prior written authorization from Intel.

 *

 * 4. Disclaimer and Export Compliance

 *

 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED

 * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE

 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,

 * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY

 * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY

 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A

 * PARTICULAR PURPOSE.

 *

 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES

 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR

 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,

 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY

 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL

 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS

 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY

 * LIMITED REMEDY.

 *

 * 4.3. Licensee shall not export, either directly or indirectly, any of this

 * software or system incorporating such software without first obtaining any

 * required license or other approval from the U. S. Department of Commerce or

 * any other agency or department of the United States Government.  In the

 * event Licensee exports any such software from the United States or

 * re-exports any such software from a foreign destination, Licensee shall

 * ensure that the distribution and export/re-export of the software is in

 * compliance with all laws, regulations, orders, or other restrictions of the

 * U.S. Export Administration Regulations. Licensee agrees that neither it nor

 * any of its subsidiaries will export/re-export any technical data, process,

 * software, or service, directly or indirectly, to any country for which the

 * United States government or any agency thereof requires an export license,

 * other governmental approval, or letter of assurance, without first obtaining

 * such license, approval or letter.

 *

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

#define __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 = (UINT64) *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 0x%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: 0x%X", ArgType));

        Status = AE_AML_OPERAND_TYPE;

        break;

    }

    *ReturnArg = Arg;

    return_ACPI_STATUS (Status);

}