1 /******************************************************************************
   2  *
   3  * Module Name: psargs - Parse AML opcode arguments
   4  *
   5  *****************************************************************************/
   6 
   7 /*
   8  * Copyright (C) 2000 - 2013, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43 
  44 #define __PSARGS_C__
  45 
  46 #include "acpi.h"
  47 #include "accommon.h"
  48 #include "acparser.h"
  49 #include "amlcode.h"
  50 #include "acnamesp.h"
  51 #include "acdispat.h"
  52 
  53 #define _COMPONENT          ACPI_PARSER
  54         ACPI_MODULE_NAME    ("psargs")
  55 
  56 /* Local prototypes */
  57 
  58 static UINT32
  59 AcpiPsGetNextPackageLength (
  60     ACPI_PARSE_STATE        *ParserState);
  61 
  62 static ACPI_PARSE_OBJECT *
  63 AcpiPsGetNextField (
  64     ACPI_PARSE_STATE        *ParserState);
  65 
  66 
  67 /*******************************************************************************
  68  *
  69  * FUNCTION:    AcpiPsGetNextPackageLength
  70  *
  71  * PARAMETERS:  ParserState         - Current parser state object
  72  *
  73  * RETURN:      Decoded package length. On completion, the AML pointer points
  74  *              past the length byte or bytes.
  75  *
  76  * DESCRIPTION: Decode and return a package length field.
  77  *              Note: Largest package length is 28 bits, from ACPI specification
  78  *
  79  ******************************************************************************/
  80 
  81 static UINT32
  82 AcpiPsGetNextPackageLength (
  83     ACPI_PARSE_STATE        *ParserState)
  84 {
  85     UINT8                   *Aml = ParserState->Aml;
  86     UINT32                  PackageLength = 0;
  87     UINT32                  ByteCount;
  88     UINT8                   ByteZeroMask = 0x3F; /* Default [0:5] */
  89 
  90 
  91     ACPI_FUNCTION_TRACE (PsGetNextPackageLength);
  92 
  93 
  94     /*
  95      * Byte 0 bits [6:7] contain the number of additional bytes
  96      * used to encode the package length, either 0,1,2, or 3
  97      */
  98     ByteCount = (Aml[0] >> 6);
  99     ParserState->Aml += ((ACPI_SIZE) ByteCount + 1);
 100 
 101     /* Get bytes 3, 2, 1 as needed */
 102 
 103     while (ByteCount)
 104     {
 105         /*
 106          * Final bit positions for the package length bytes:
 107          *      Byte3->[20:27]
 108          *      Byte2->[12:19]
 109          *      Byte1->[04:11]
 110          *      Byte0->[00:03]
 111          */
 112         PackageLength |= (Aml[ByteCount] << ((ByteCount << 3) - 4));
 113 
 114         ByteZeroMask = 0x0F; /* Use bits [0:3] of byte 0 */
 115         ByteCount--;
 116     }
 117 
 118     /* Byte 0 is a special case, either bits [0:3] or [0:5] are used */
 119 
 120     PackageLength |= (Aml[0] & ByteZeroMask);
 121     return_UINT32 (PackageLength);
 122 }
 123 
 124 
 125 /*******************************************************************************
 126  *
 127  * FUNCTION:    AcpiPsGetNextPackageEnd
 128  *
 129  * PARAMETERS:  ParserState         - Current parser state object
 130  *
 131  * RETURN:      Pointer to end-of-package +1
 132  *
 133  * DESCRIPTION: Get next package length and return a pointer past the end of
 134  *              the package. Consumes the package length field
 135  *
 136  ******************************************************************************/
 137 
 138 UINT8 *
 139 AcpiPsGetNextPackageEnd (
 140     ACPI_PARSE_STATE        *ParserState)
 141 {
 142     UINT8                   *Start = ParserState->Aml;
 143     UINT32                  PackageLength;
 144 
 145 
 146     ACPI_FUNCTION_TRACE (PsGetNextPackageEnd);
 147 
 148 
 149     /* Function below updates ParserState->Aml */
 150 
 151     PackageLength = AcpiPsGetNextPackageLength (ParserState);
 152 
 153     return_PTR (Start + PackageLength); /* end of package */
 154 }
 155 
 156 
 157 /*******************************************************************************
 158  *
 159  * FUNCTION:    AcpiPsGetNextNamestring
 160  *
 161  * PARAMETERS:  ParserState         - Current parser state object
 162  *
 163  * RETURN:      Pointer to the start of the name string (pointer points into
 164  *              the AML.
 165  *
 166  * DESCRIPTION: Get next raw namestring within the AML stream. Handles all name
 167  *              prefix characters. Set parser state to point past the string.
 168  *              (Name is consumed from the AML.)
 169  *
 170  ******************************************************************************/
 171 
 172 char *
 173 AcpiPsGetNextNamestring (
 174     ACPI_PARSE_STATE        *ParserState)
 175 {
 176     UINT8                   *Start = ParserState->Aml;
 177     UINT8                   *End = ParserState->Aml;
 178 
 179 
 180     ACPI_FUNCTION_TRACE (PsGetNextNamestring);
 181 
 182 
 183     /* Point past any namestring prefix characters (backslash or carat) */
 184 
 185     while (ACPI_IS_ROOT_PREFIX (*End) ||
 186            ACPI_IS_PARENT_PREFIX (*End))
 187     {
 188         End++;
 189     }
 190 
 191     /* Decode the path prefix character */
 192 
 193     switch (*End)
 194     {
 195     case 0:
 196 
 197         /* NullName */
 198 
 199         if (End == Start)
 200         {
 201             Start = NULL;
 202         }
 203         End++;
 204         break;
 205 
 206     case AML_DUAL_NAME_PREFIX:
 207 
 208         /* Two name segments */
 209 
 210         End += 1 + (2 * ACPI_NAME_SIZE);
 211         break;
 212 
 213     case AML_MULTI_NAME_PREFIX_OP:
 214 
 215         /* Multiple name segments, 4 chars each, count in next byte */
 216 
 217         End += 2 + (*(End + 1) * ACPI_NAME_SIZE);
 218         break;
 219 
 220     default:
 221 
 222         /* Single name segment */
 223 
 224         End += ACPI_NAME_SIZE;
 225         break;
 226     }
 227 
 228     ParserState->Aml = End;
 229     return_PTR ((char *) Start);
 230 }
 231 
 232 
 233 /*******************************************************************************
 234  *
 235  * FUNCTION:    AcpiPsGetNextNamepath
 236  *
 237  * PARAMETERS:  ParserState         - Current parser state object
 238  *              Arg                 - Where the namepath will be stored
 239  *              ArgCount            - If the namepath points to a control method
 240  *                                    the method's argument is returned here.
 241  *              PossibleMethodCall  - Whether the namepath can possibly be the
 242  *                                    start of a method call
 243  *
 244  * RETURN:      Status
 245  *
 246  * DESCRIPTION: Get next name (if method call, return # of required args).
 247  *              Names are looked up in the internal namespace to determine
 248  *              if the name represents a control method. If a method
 249  *              is found, the number of arguments to the method is returned.
 250  *              This information is critical for parsing to continue correctly.
 251  *
 252  ******************************************************************************/
 253 
 254 ACPI_STATUS
 255 AcpiPsGetNextNamepath (
 256     ACPI_WALK_STATE         *WalkState,
 257     ACPI_PARSE_STATE        *ParserState,
 258     ACPI_PARSE_OBJECT       *Arg,
 259     BOOLEAN                 PossibleMethodCall)
 260 {
 261     ACPI_STATUS             Status;
 262     char                    *Path;
 263     ACPI_PARSE_OBJECT       *NameOp;
 264     ACPI_OPERAND_OBJECT     *MethodDesc;
 265     ACPI_NAMESPACE_NODE     *Node;
 266     UINT8                   *Start = ParserState->Aml;
 267 
 268 
 269     ACPI_FUNCTION_TRACE (PsGetNextNamepath);
 270 
 271 
 272     Path = AcpiPsGetNextNamestring (ParserState);
 273     AcpiPsInitOp (Arg, AML_INT_NAMEPATH_OP);
 274 
 275     /* Null path case is allowed, just exit */
 276 
 277     if (!Path)
 278     {
 279         Arg->Common.Value.Name = Path;
 280         return_ACPI_STATUS (AE_OK);
 281     }
 282 
 283     /*
 284      * Lookup the name in the internal namespace, starting with the current
 285      * scope. We don't want to add anything new to the namespace here,
 286      * however, so we use MODE_EXECUTE.
 287      * Allow searching of the parent tree, but don't open a new scope -
 288      * we just want to lookup the object (must be mode EXECUTE to perform
 289      * the upsearch)
 290      */
 291     Status = AcpiNsLookup (WalkState->ScopeInfo, Path,
 292                 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
 293                 ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, NULL, &Node);
 294 
 295     /*
 296      * If this name is a control method invocation, we must
 297      * setup the method call
 298      */
 299     if (ACPI_SUCCESS (Status) &&
 300         PossibleMethodCall &&
 301         (Node->Type == ACPI_TYPE_METHOD))
 302     {
 303         if (WalkState->Opcode == AML_UNLOAD_OP)
 304         {
 305             /*
 306              * AcpiPsGetNextNamestring has increased the AML pointer,
 307              * so we need to restore the saved AML pointer for method call.
 308              */
 309             WalkState->ParserState.Aml = Start;
 310             WalkState->ArgCount = 1;
 311             AcpiPsInitOp (Arg, AML_INT_METHODCALL_OP);
 312             return_ACPI_STATUS (AE_OK);
 313         }
 314 
 315         /* This name is actually a control method invocation */
 316 
 317         MethodDesc = AcpiNsGetAttachedObject (Node);
 318         ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
 319             "Control Method - %p Desc %p Path=%p\n", Node, MethodDesc, Path));
 320 
 321         NameOp = AcpiPsAllocOp (AML_INT_NAMEPATH_OP);
 322         if (!NameOp)
 323         {
 324             return_ACPI_STATUS (AE_NO_MEMORY);
 325         }
 326 
 327         /* Change Arg into a METHOD CALL and attach name to it */
 328 
 329         AcpiPsInitOp (Arg, AML_INT_METHODCALL_OP);
 330         NameOp->Common.Value.Name = Path;
 331 
 332         /* Point METHODCALL/NAME to the METHOD Node */
 333 
 334         NameOp->Common.Node = Node;
 335         AcpiPsAppendArg (Arg, NameOp);
 336 
 337         if (!MethodDesc)
 338         {
 339             ACPI_ERROR ((AE_INFO,
 340                 "Control Method %p has no attached object",
 341                 Node));
 342             return_ACPI_STATUS (AE_AML_INTERNAL);
 343         }
 344 
 345         ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
 346             "Control Method - %p Args %X\n",
 347             Node, MethodDesc->Method.ParamCount));
 348 
 349         /* Get the number of arguments to expect */
 350 
 351         WalkState->ArgCount = MethodDesc->Method.ParamCount;
 352         return_ACPI_STATUS (AE_OK);
 353     }
 354 
 355     /*
 356      * Special handling if the name was not found during the lookup -
 357      * some NotFound cases are allowed
 358      */
 359     if (Status == AE_NOT_FOUND)
 360     {
 361         /* 1) NotFound is ok during load pass 1/2 (allow forward references) */
 362 
 363         if ((WalkState->ParseFlags & ACPI_PARSE_MODE_MASK) !=
 364                 ACPI_PARSE_EXECUTE)
 365         {
 366             Status = AE_OK;
 367         }
 368 
 369         /* 2) NotFound during a CondRefOf(x) is ok by definition */
 370 
 371         else if (WalkState->Op->Common.AmlOpcode == AML_COND_REF_OF_OP)
 372         {
 373             Status = AE_OK;
 374         }
 375 
 376         /*
 377          * 3) NotFound while building a Package is ok at this point, we
 378          * may flag as an error later if slack mode is not enabled.
 379          * (Some ASL code depends on allowing this behavior)
 380          */
 381         else if ((Arg->Common.Parent) &&
 382             ((Arg->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
 383              (Arg->Common.Parent->Common.AmlOpcode == AML_VAR_PACKAGE_OP)))
 384         {
 385             Status = AE_OK;
 386         }
 387     }
 388 
 389     /* Final exception check (may have been changed from code above) */
 390 
 391     if (ACPI_FAILURE (Status))
 392     {
 393         ACPI_ERROR_NAMESPACE (Path, Status);
 394 
 395         if ((WalkState->ParseFlags & ACPI_PARSE_MODE_MASK) ==
 396                 ACPI_PARSE_EXECUTE)
 397         {
 398             /* Report a control method execution error */
 399 
 400             Status = AcpiDsMethodError (Status, WalkState);
 401         }
 402     }
 403 
 404     /* Save the namepath */
 405 
 406     Arg->Common.Value.Name = Path;
 407     return_ACPI_STATUS (Status);
 408 }
 409 
 410 
 411 /*******************************************************************************
 412  *
 413  * FUNCTION:    AcpiPsGetNextSimpleArg
 414  *
 415  * PARAMETERS:  ParserState         - Current parser state object
 416  *              ArgType             - The argument type (AML_*_ARG)
 417  *              Arg                 - Where the argument is returned
 418  *
 419  * RETURN:      None
 420  *
 421  * DESCRIPTION: Get the next simple argument (constant, string, or namestring)
 422  *
 423  ******************************************************************************/
 424 
 425 void
 426 AcpiPsGetNextSimpleArg (
 427     ACPI_PARSE_STATE        *ParserState,
 428     UINT32                  ArgType,
 429     ACPI_PARSE_OBJECT       *Arg)
 430 {
 431     UINT32                  Length;
 432     UINT16                  Opcode;
 433     UINT8                   *Aml = ParserState->Aml;
 434 
 435 
 436     ACPI_FUNCTION_TRACE_U32 (PsGetNextSimpleArg, ArgType);
 437 
 438 
 439     switch (ArgType)
 440     {
 441     case ARGP_BYTEDATA:
 442 
 443         /* Get 1 byte from the AML stream */
 444 
 445         Opcode = AML_BYTE_OP;
 446         Arg->Common.Value.Integer = (UINT64) *Aml;
 447         Length = 1;
 448         break;
 449 
 450     case ARGP_WORDDATA:
 451 
 452         /* Get 2 bytes from the AML stream */
 453 
 454         Opcode = AML_WORD_OP;
 455         ACPI_MOVE_16_TO_64 (&Arg->Common.Value.Integer, Aml);
 456         Length = 2;
 457         break;
 458 
 459     case ARGP_DWORDDATA:
 460 
 461         /* Get 4 bytes from the AML stream */
 462 
 463         Opcode = AML_DWORD_OP;
 464         ACPI_MOVE_32_TO_64 (&Arg->Common.Value.Integer, Aml);
 465         Length = 4;
 466         break;
 467 
 468     case ARGP_QWORDDATA:
 469 
 470         /* Get 8 bytes from the AML stream */
 471 
 472         Opcode = AML_QWORD_OP;
 473         ACPI_MOVE_64_TO_64 (&Arg->Common.Value.Integer, Aml);
 474         Length = 8;
 475         break;
 476 
 477     case ARGP_CHARLIST:
 478 
 479         /* Get a pointer to the string, point past the string */
 480 
 481         Opcode = AML_STRING_OP;
 482         Arg->Common.Value.String = ACPI_CAST_PTR (char, Aml);
 483 
 484         /* Find the null terminator */
 485 
 486         Length = 0;
 487         while (Aml[Length])
 488         {
 489             Length++;
 490         }
 491         Length++;
 492         break;
 493 
 494     case ARGP_NAME:
 495     case ARGP_NAMESTRING:
 496 
 497         AcpiPsInitOp (Arg, AML_INT_NAMEPATH_OP);
 498         Arg->Common.Value.Name = AcpiPsGetNextNamestring (ParserState);
 499         return_VOID;
 500 
 501     default:
 502 
 503         ACPI_ERROR ((AE_INFO, "Invalid ArgType 0x%X", ArgType));
 504         return_VOID;
 505     }
 506 
 507     AcpiPsInitOp (Arg, Opcode);
 508     ParserState->Aml += Length;
 509     return_VOID;
 510 }
 511 
 512 
 513 /*******************************************************************************
 514  *
 515  * FUNCTION:    AcpiPsGetNextField
 516  *
 517  * PARAMETERS:  ParserState         - Current parser state object
 518  *
 519  * RETURN:      A newly allocated FIELD op
 520  *
 521  * DESCRIPTION: Get next field (NamedField, ReservedField, or AccessField)
 522  *
 523  ******************************************************************************/
 524 
 525 static ACPI_PARSE_OBJECT *
 526 AcpiPsGetNextField (
 527     ACPI_PARSE_STATE        *ParserState)
 528 {
 529     UINT32                  AmlOffset;
 530     ACPI_PARSE_OBJECT       *Field;
 531     ACPI_PARSE_OBJECT       *Arg = NULL;
 532     UINT16                  Opcode;
 533     UINT32                  Name;
 534     UINT8                   AccessType;
 535     UINT8                   AccessAttribute;
 536     UINT8                   AccessLength;
 537     UINT32                  PkgLength;
 538     UINT8                   *PkgEnd;
 539     UINT32                  BufferLength;
 540 
 541 
 542     ACPI_FUNCTION_TRACE (PsGetNextField);
 543 
 544 
 545     AmlOffset = (UINT32) ACPI_PTR_DIFF (
 546         ParserState->Aml, ParserState->AmlStart);
 547 
 548     /* Determine field type */
 549 
 550     switch (ACPI_GET8 (ParserState->Aml))
 551     {
 552     case AML_FIELD_OFFSET_OP:
 553 
 554         Opcode = AML_INT_RESERVEDFIELD_OP;
 555         ParserState->Aml++;
 556         break;
 557 
 558     case AML_FIELD_ACCESS_OP:
 559 
 560         Opcode = AML_INT_ACCESSFIELD_OP;
 561         ParserState->Aml++;
 562         break;
 563 
 564     case AML_FIELD_CONNECTION_OP:
 565 
 566         Opcode = AML_INT_CONNECTION_OP;
 567         ParserState->Aml++;
 568         break;
 569 
 570     case AML_FIELD_EXT_ACCESS_OP:
 571 
 572         Opcode = AML_INT_EXTACCESSFIELD_OP;
 573         ParserState->Aml++;
 574         break;
 575 
 576     default:
 577 
 578         Opcode = AML_INT_NAMEDFIELD_OP;
 579         break;
 580     }
 581 
 582     /* Allocate a new field op */
 583 
 584     Field = AcpiPsAllocOp (Opcode);
 585     if (!Field)
 586     {
 587         return_PTR (NULL);
 588     }
 589 
 590     Field->Common.AmlOffset = AmlOffset;
 591 
 592     /* Decode the field type */
 593 
 594     switch (Opcode)
 595     {
 596     case AML_INT_NAMEDFIELD_OP:
 597 
 598         /* Get the 4-character name */
 599 
 600         ACPI_MOVE_32_TO_32 (&Name, ParserState->Aml);
 601         AcpiPsSetName (Field, Name);
 602         ParserState->Aml += ACPI_NAME_SIZE;
 603 
 604         /* Get the length which is encoded as a package length */
 605 
 606         Field->Common.Value.Size = AcpiPsGetNextPackageLength (ParserState);
 607         break;
 608 
 609 
 610     case AML_INT_RESERVEDFIELD_OP:
 611 
 612         /* Get the length which is encoded as a package length */
 613 
 614         Field->Common.Value.Size = AcpiPsGetNextPackageLength (ParserState);
 615         break;
 616 
 617 
 618     case AML_INT_ACCESSFIELD_OP:
 619     case AML_INT_EXTACCESSFIELD_OP:
 620 
 621         /*
 622          * Get AccessType and AccessAttrib and merge into the field Op
 623          * AccessType is first operand, AccessAttribute is second. stuff
 624          * these bytes into the node integer value for convenience.
 625          */
 626 
 627         /* Get the two bytes (Type/Attribute) */
 628 
 629         AccessType = ACPI_GET8 (ParserState->Aml);
 630         ParserState->Aml++;
 631         AccessAttribute = ACPI_GET8 (ParserState->Aml);
 632         ParserState->Aml++;
 633 
 634         Field->Common.Value.Integer = (UINT8) AccessType;
 635         Field->Common.Value.Integer |= (UINT16) (AccessAttribute << 8);
 636 
 637         /* This opcode has a third byte, AccessLength */
 638 
 639         if (Opcode == AML_INT_EXTACCESSFIELD_OP)
 640         {
 641             AccessLength = ACPI_GET8 (ParserState->Aml);
 642             ParserState->Aml++;
 643 
 644             Field->Common.Value.Integer |= (UINT32) (AccessLength << 16);
 645         }
 646         break;
 647 
 648 
 649     case AML_INT_CONNECTION_OP:
 650 
 651         /*
 652          * Argument for Connection operator can be either a Buffer
 653          * (resource descriptor), or a NameString.
 654          */
 655         if (ACPI_GET8 (ParserState->Aml) == AML_BUFFER_OP)
 656         {
 657             ParserState->Aml++;
 658 
 659             PkgEnd = ParserState->Aml;
 660             PkgLength = AcpiPsGetNextPackageLength (ParserState);
 661             PkgEnd += PkgLength;
 662 
 663             if (ParserState->Aml < PkgEnd)
 664             {
 665                 /* Non-empty list */
 666 
 667                 Arg = AcpiPsAllocOp (AML_INT_BYTELIST_OP);
 668                 if (!Arg)
 669                 {
 670                     AcpiPsFreeOp (Field);
 671                     return_PTR (NULL);
 672                 }
 673 
 674                 /* Get the actual buffer length argument */
 675 
 676                 Opcode = ACPI_GET8 (ParserState->Aml);
 677                 ParserState->Aml++;
 678 
 679                 switch (Opcode)
 680                 {
 681                 case AML_BYTE_OP:       /* AML_BYTEDATA_ARG */
 682 
 683                     BufferLength = ACPI_GET8 (ParserState->Aml);
 684                     ParserState->Aml += 1;
 685                     break;
 686 
 687                 case AML_WORD_OP:       /* AML_WORDDATA_ARG */
 688 
 689                     BufferLength = ACPI_GET16 (ParserState->Aml);
 690                     ParserState->Aml += 2;
 691                     break;
 692 
 693                 case AML_DWORD_OP:      /* AML_DWORDATA_ARG */
 694 
 695                     BufferLength = ACPI_GET32 (ParserState->Aml);
 696                     ParserState->Aml += 4;
 697                     break;
 698 
 699                 default:
 700 
 701                     BufferLength = 0;
 702                     break;
 703                 }
 704 
 705                 /* Fill in bytelist data */
 706 
 707                 Arg->Named.Value.Size = BufferLength;
 708                 Arg->Named.Data = ParserState->Aml;
 709             }
 710 
 711             /* Skip to End of byte data */
 712 
 713             ParserState->Aml = PkgEnd;
 714         }
 715         else
 716         {
 717             Arg = AcpiPsAllocOp (AML_INT_NAMEPATH_OP);
 718             if (!Arg)
 719             {
 720                 AcpiPsFreeOp (Field);
 721                 return_PTR (NULL);
 722             }
 723 
 724             /* Get the Namestring argument */
 725 
 726             Arg->Common.Value.Name = AcpiPsGetNextNamestring (ParserState);
 727         }
 728 
 729         /* Link the buffer/namestring to parent (CONNECTION_OP) */
 730 
 731         AcpiPsAppendArg (Field, Arg);
 732         break;
 733 
 734 
 735     default:
 736 
 737         /* Opcode was set in previous switch */
 738         break;
 739     }
 740 
 741     return_PTR (Field);
 742 }
 743 
 744 
 745 /*******************************************************************************
 746  *
 747  * FUNCTION:    AcpiPsGetNextArg
 748  *
 749  * PARAMETERS:  WalkState           - Current state
 750  *              ParserState         - Current parser state object
 751  *              ArgType             - The argument type (AML_*_ARG)
 752  *              ReturnArg           - Where the next arg is returned
 753  *
 754  * RETURN:      Status, and an op object containing the next argument.
 755  *
 756  * DESCRIPTION: Get next argument (including complex list arguments that require
 757  *              pushing the parser stack)
 758  *
 759  ******************************************************************************/
 760 
 761 ACPI_STATUS
 762 AcpiPsGetNextArg (
 763     ACPI_WALK_STATE         *WalkState,
 764     ACPI_PARSE_STATE        *ParserState,
 765     UINT32                  ArgType,
 766     ACPI_PARSE_OBJECT       **ReturnArg)
 767 {
 768     ACPI_PARSE_OBJECT       *Arg = NULL;
 769     ACPI_PARSE_OBJECT       *Prev = NULL;
 770     ACPI_PARSE_OBJECT       *Field;
 771     UINT32                  Subop;
 772     ACPI_STATUS             Status = AE_OK;
 773 
 774 
 775     ACPI_FUNCTION_TRACE_PTR (PsGetNextArg, ParserState);
 776 
 777 
 778     switch (ArgType)
 779     {
 780     case ARGP_BYTEDATA:
 781     case ARGP_WORDDATA:
 782     case ARGP_DWORDDATA:
 783     case ARGP_CHARLIST:
 784     case ARGP_NAME:
 785     case ARGP_NAMESTRING:
 786 
 787         /* Constants, strings, and namestrings are all the same size */
 788 
 789         Arg = AcpiPsAllocOp (AML_BYTE_OP);
 790         if (!Arg)
 791         {
 792             return_ACPI_STATUS (AE_NO_MEMORY);
 793         }
 794         AcpiPsGetNextSimpleArg (ParserState, ArgType, Arg);
 795         break;
 796 
 797     case ARGP_PKGLENGTH:
 798 
 799         /* Package length, nothing returned */
 800 
 801         ParserState->PkgEnd = AcpiPsGetNextPackageEnd (ParserState);
 802         break;
 803 
 804     case ARGP_FIELDLIST:
 805 
 806         if (ParserState->Aml < ParserState->PkgEnd)
 807         {
 808             /* Non-empty list */
 809 
 810             while (ParserState->Aml < ParserState->PkgEnd)
 811             {
 812                 Field = AcpiPsGetNextField (ParserState);
 813                 if (!Field)
 814                 {
 815                     return_ACPI_STATUS (AE_NO_MEMORY);
 816                 }
 817 
 818                 if (Prev)
 819                 {
 820                     Prev->Common.Next = Field;
 821                 }
 822                 else
 823                 {
 824                     Arg = Field;
 825                 }
 826                 Prev = Field;
 827             }
 828 
 829             /* Skip to End of byte data */
 830 
 831             ParserState->Aml = ParserState->PkgEnd;
 832         }
 833         break;
 834 
 835     case ARGP_BYTELIST:
 836 
 837         if (ParserState->Aml < ParserState->PkgEnd)
 838         {
 839             /* Non-empty list */
 840 
 841             Arg = AcpiPsAllocOp (AML_INT_BYTELIST_OP);
 842             if (!Arg)
 843             {
 844                 return_ACPI_STATUS (AE_NO_MEMORY);
 845             }
 846 
 847             /* Fill in bytelist data */
 848 
 849             Arg->Common.Value.Size = (UINT32)
 850                 ACPI_PTR_DIFF (ParserState->PkgEnd, ParserState->Aml);
 851             Arg->Named.Data = ParserState->Aml;
 852 
 853             /* Skip to End of byte data */
 854 
 855             ParserState->Aml = ParserState->PkgEnd;
 856         }
 857         break;
 858 
 859     case ARGP_TARGET:
 860     case ARGP_SUPERNAME:
 861     case ARGP_SIMPLENAME:
 862 
 863         Subop = AcpiPsPeekOpcode (ParserState);
 864         if (Subop == 0                  ||
 865             AcpiPsIsLeadingChar (Subop) ||
 866             ACPI_IS_ROOT_PREFIX (Subop) ||
 867             ACPI_IS_PARENT_PREFIX (Subop))
 868         {
 869             /* NullName or NameString */
 870 
 871             Arg = AcpiPsAllocOp (AML_INT_NAMEPATH_OP);
 872             if (!Arg)
 873             {
 874                 return_ACPI_STATUS (AE_NO_MEMORY);
 875             }
 876 
 877             /* To support SuperName arg of Unload */
 878 
 879             if (WalkState->Opcode == AML_UNLOAD_OP)
 880             {
 881                 Status = AcpiPsGetNextNamepath (WalkState, ParserState, Arg, 1);
 882 
 883                 /*
 884                  * If the SuperName arg of Unload is a method call,
 885                  * we have restored the AML pointer, just free this Arg
 886                  */
 887                 if (Arg->Common.AmlOpcode == AML_INT_METHODCALL_OP)
 888                 {
 889                     AcpiPsFreeOp (Arg);
 890                     Arg = NULL;
 891                 }
 892             }
 893             else
 894             {
 895                 Status = AcpiPsGetNextNamepath (WalkState, ParserState, Arg, 0);
 896             }
 897         }
 898         else
 899         {
 900             /* Single complex argument, nothing returned */
 901 
 902             WalkState->ArgCount = 1;
 903         }
 904         break;
 905 
 906     case ARGP_DATAOBJ:
 907     case ARGP_TERMARG:
 908 
 909         /* Single complex argument, nothing returned */
 910 
 911         WalkState->ArgCount = 1;
 912         break;
 913 
 914     case ARGP_DATAOBJLIST:
 915     case ARGP_TERMLIST:
 916     case ARGP_OBJLIST:
 917 
 918         if (ParserState->Aml < ParserState->PkgEnd)
 919         {
 920             /* Non-empty list of variable arguments, nothing returned */
 921 
 922             WalkState->ArgCount = ACPI_VAR_ARGS;
 923         }
 924         break;
 925 
 926     default:
 927 
 928         ACPI_ERROR ((AE_INFO, "Invalid ArgType: 0x%X", ArgType));
 929         Status = AE_AML_OPERAND_TYPE;
 930         break;
 931     }
 932 
 933     *ReturnArg = Arg;
 934     return_ACPI_STATUS (Status);
 935 }