FreeBSD/Linux Kernel Cross Reference
sys/contrib/dev/acpica/components/parser/psargs.c

     /******************************************************************************
      *
      * Module Name: psargs - Parse AML opcode arguments
      *
      *****************************************************************************/
     
     /******************************************************************************
      *
      * 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/acnamesp.h>
   #include <contrib/dev/acpica/include/acdispat.h>
   #include <contrib/dev/acpica/include/acconvert.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 (ACPI_IS_ROOT_PREFIX (*End) ||
              ACPI_IS_PARENT_PREFIX (*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_NAMESEG_SIZE);
           break;
   
       case AML_MULTI_NAME_PREFIX:
   
           /* Multiple name segments, 4 chars each, count in next byte */
   
           End += 2 + (*(End + 1) * ACPI_NAMESEG_SIZE);
           break;
   
       default:
   
           /* Single name segment */
   
           End += ACPI_NAMESEG_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 ((GET_CURRENT_ARG_TYPE (WalkState->ArgTypes) == ARGP_SUPERNAME) ||
               (GET_CURRENT_ARG_TYPE (WalkState->ArgTypes) == ARGP_TARGET))
           {
               /*
                * AcpiPsGetNextNamestring has increased the AML pointer past
                * the method invocation namestring, so we need to restore the
                * saved AML pointer back to the original method invocation
                * namestring.
                */
               WalkState->ParserState.Aml = Start;
               WalkState->ArgCount = 1;
               AcpiPsInitOp (Arg, AML_INT_METHODCALL_OP);
           }
   
           /* This name is actually a control method invocation */
   
           MethodDesc = AcpiNsGetAttachedObject (Node);
           ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
               "Control Method invocation %4.4s - %p Desc %p Path=%p\n",
               Node->Name.Ascii, Node, MethodDesc, Path));
   
           NameOp = AcpiPsAllocOp (AML_INT_NAMEPATH_OP, Start);
           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_CONDITIONAL_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_VARIABLE_PACKAGE_OP)))
           {
               Status = AE_OK;
           }
       }
   
       /* Final exception check (may have been changed from code above) */
   
       if (ACPI_FAILURE (Status))
       {
           ACPI_ERROR_NAMESPACE (WalkState->ScopeInfo, 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)
   {
       UINT8                   *Aml;
       ACPI_PARSE_OBJECT       *Field;
       ACPI_PARSE_OBJECT       *Arg = NULL;
       UINT16                  Opcode;
       UINT32                  Name;
       UINT8                   AccessType;
       UINT8                   AccessAttribute;
       UINT8                   AccessLength;
       UINT32                  PkgLength;
       UINT8                   *PkgEnd;
       UINT32                  BufferLength;
   
   
       ACPI_FUNCTION_TRACE (PsGetNextField);
   
   
       ASL_CV_CAPTURE_COMMENTS_ONLY (ParserState);
       Aml = ParserState->Aml;
   
       /* Determine field type */
   
       switch (ACPI_GET8 (ParserState->Aml))
       {
       case AML_FIELD_OFFSET_OP:
   
           Opcode = AML_INT_RESERVEDFIELD_OP;
           ParserState->Aml++;
           break;
   
       case AML_FIELD_ACCESS_OP:
   
           Opcode = AML_INT_ACCESSFIELD_OP;
           ParserState->Aml++;
           break;
   
       case AML_FIELD_CONNECTION_OP:
   
           Opcode = AML_INT_CONNECTION_OP;
           ParserState->Aml++;
           break;
   
       case AML_FIELD_EXT_ACCESS_OP:
   
           Opcode = AML_INT_EXTACCESSFIELD_OP;
           ParserState->Aml++;
           break;
   
       default:
   
           Opcode = AML_INT_NAMEDFIELD_OP;
           break;
       }
   
       /* Allocate a new field op */
   
       Field = AcpiPsAllocOp (Opcode, Aml);
       if (!Field)
       {
           return_PTR (NULL);
       }
   
       /* Decode the field type */
   
       ASL_CV_CAPTURE_COMMENTS_ONLY (ParserState);
       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_NAMESEG_SIZE;
   
   
           ASL_CV_CAPTURE_COMMENTS_ONLY (ParserState);
   
   #ifdef ACPI_ASL_COMPILER
           /*
            * Because the package length isn't represented as a parse tree object,
            * take comments surrounding this and add to the previously created
            * parse node.
            */
           if (Field->Common.InlineComment)
           {
               Field->Common.NameComment = Field->Common.InlineComment;
           }
           Field->Common.InlineComment  = AcpiGbl_CurrentInlineComment;
           AcpiGbl_CurrentInlineComment = NULL;
   #endif
   
           /* 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:
       case AML_INT_EXTACCESSFIELD_OP:
   
           /*
            * Get AccessType and AccessAttrib and merge into the field Op
            * AccessType is first operand, AccessAttribute is second. stuff
            * these bytes into the node integer value for convenience.
            */
   
           /* Get the two bytes (Type/Attribute) */
   
           AccessType = ACPI_GET8 (ParserState->Aml);
           ParserState->Aml++;
           AccessAttribute = ACPI_GET8 (ParserState->Aml);
           ParserState->Aml++;
   
           Field->Common.Value.Integer = (UINT8) AccessType;
           Field->Common.Value.Integer |= (UINT16) (AccessAttribute << 8);
   
           /* This opcode has a third byte, AccessLength */
   
           if (Opcode == AML_INT_EXTACCESSFIELD_OP)
           {
               AccessLength = ACPI_GET8 (ParserState->Aml);
               ParserState->Aml++;
   
               Field->Common.Value.Integer |= (UINT32) (AccessLength << 16);
           }
           break;
   
   
       case AML_INT_CONNECTION_OP:
   
           /*
            * Argument for Connection operator can be either a Buffer
            * (resource descriptor), or a NameString.
            */
           Aml = ParserState->Aml;
           if (ACPI_GET8 (ParserState->Aml) == AML_BUFFER_OP)
           {
               ParserState->Aml++;
   
               ASL_CV_CAPTURE_COMMENTS_ONLY (ParserState);
               PkgEnd = ParserState->Aml;
               PkgLength = AcpiPsGetNextPackageLength (ParserState);
               PkgEnd += PkgLength;
   
               ASL_CV_CAPTURE_COMMENTS_ONLY (ParserState);
               if (ParserState->Aml < PkgEnd)
               {
                   /* Non-empty list */
   
                   Arg = AcpiPsAllocOp (AML_INT_BYTELIST_OP, Aml);
                   if (!Arg)
                   {
                       AcpiPsFreeOp (Field);
                       return_PTR (NULL);
                   }
   
                   /* Get the actual buffer length argument */
   
                   Opcode = ACPI_GET8 (ParserState->Aml);
                   ParserState->Aml++;
   
                   ASL_CV_CAPTURE_COMMENTS_ONLY (ParserState);
                   switch (Opcode)
                   {
                   case AML_BYTE_OP:       /* AML_BYTEDATA_ARG */
   
                       BufferLength = ACPI_GET8 (ParserState->Aml);
                       ParserState->Aml += 1;
                       break;
   
                   case AML_WORD_OP:       /* AML_WORDDATA_ARG */
   
                       BufferLength = ACPI_GET16 (ParserState->Aml);
                       ParserState->Aml += 2;
                       break;
   
                   case AML_DWORD_OP:      /* AML_DWORDATA_ARG */
   
                       BufferLength = ACPI_GET32 (ParserState->Aml);
                       ParserState->Aml += 4;
                       break;
   
                   default:
   
                       BufferLength = 0;
                       break;
                   }
   
                   /* Fill in bytelist data */
   
                   ASL_CV_CAPTURE_COMMENTS_ONLY (ParserState);
                   Arg->Named.Value.Size = BufferLength;
                   Arg->Named.Data = ParserState->Aml;
               }
   
               /* Skip to End of byte data */
   
               ParserState->Aml = PkgEnd;
           }
           else
           {
               Arg = AcpiPsAllocOp (AML_INT_NAMEPATH_OP, Aml);
               if (!Arg)
               {
                   AcpiPsFreeOp (Field);
                   return_PTR (NULL);
               }
   
               /* Get the Namestring argument */
   
               Arg->Common.Value.Name = AcpiPsGetNextNamestring (ParserState);
           }
   
           /* Link the buffer/namestring to parent (CONNECTION_OP) */
   
           AcpiPsAppendArg (Field, Arg);
           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);
   
   
       ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
           "Expected argument type ARGP: %s (%2.2X)\n",
           AcpiUtGetArgumentTypeName (ArgType), ArgType));
   
       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, ParserState->Aml);
           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,
                   ParserState->Aml);
               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_SIMPLENAME:
       case ARGP_NAME_OR_REF:
   
           ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
              "**** SimpleName/NameOrRef: %s (%2.2X)\n",
              AcpiUtGetArgumentTypeName (ArgType), ArgType));
  
          Subop = AcpiPsPeekOpcode (ParserState);
          if (Subop == 0                  ||
              AcpiPsIsLeadingChar (Subop) ||
              ACPI_IS_ROOT_PREFIX (Subop) ||
              ACPI_IS_PARENT_PREFIX (Subop))
          {
              /* NullName or NameString */
  
              Arg = AcpiPsAllocOp (AML_INT_NAMEPATH_OP, ParserState->Aml);
              if (!Arg)
              {
                  return_ACPI_STATUS (AE_NO_MEMORY);
              }
  
              Status = AcpiPsGetNextNamepath (WalkState, ParserState,
                  Arg, ACPI_NOT_METHOD_CALL);
          }
          else
          {
              /* Single complex argument, nothing returned */
  
              WalkState->ArgCount = 1;
          }
          break;
  
      case ARGP_TARGET:
      case ARGP_SUPERNAME:
  
          ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
              "**** Target/Supername: %s (%2.2X)\n",
              AcpiUtGetArgumentTypeName (ArgType), ArgType));
  
          Subop = AcpiPsPeekOpcode (ParserState);
          if (Subop == 0                  ||
              AcpiPsIsLeadingChar (Subop) ||
              ACPI_IS_ROOT_PREFIX (Subop) ||
              ACPI_IS_PARENT_PREFIX (Subop))
          {
              /* NULL target (zero). Convert to a NULL namepath */
  
              Arg = AcpiPsAllocOp (AML_INT_NAMEPATH_OP, ParserState->Aml);
              if (!Arg)
              {
                  return_ACPI_STATUS (AE_NO_MEMORY);
              }
  
              Status = AcpiPsGetNextNamepath (WalkState, ParserState,
                  Arg, ACPI_POSSIBLE_METHOD_CALL);
  
              if (Arg->Common.AmlOpcode == AML_INT_METHODCALL_OP)
              {
                  /* Free method call op and corresponding namestring sub-ob */
  
                  AcpiPsFreeOp (Arg->Common.Value.Arg);
                  AcpiPsFreeOp (Arg);
                  Arg = NULL;
                  WalkState->ArgCount = 1;
              }
          }
          else
          {
              /* Single complex argument, nothing returned */
  
              WalkState->ArgCount = 1;
          }
          break;
  
      case ARGP_DATAOBJ:
      case ARGP_TERMARG:
  
          ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
              "**** TermArg/DataObj: %s (%2.2X)\n",
              AcpiUtGetArgumentTypeName (ArgType), ArgType));
  
          /* 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);
  }

Cache object: 892f577419a1185a3e0830b0adcb8d98