sys/contrib/dev/acpica/source/components/parser/psargs.c

   1 /******************************************************************************
   2  *
   3  * Module Name: psargs - Parse AML opcode arguments
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2016, 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 #include "acpi.h"
  45 #include "accommon.h"
  46 #include "acparser.h"
  47 #include "amlcode.h"
  48 #include "acnamesp.h"
  49 #include "acdispat.h"
  50
  51 #define _COMPONENT          ACPI_PARSER
  52         ACPI_MODULE_NAME    ("psargs")
  53
  54 /* Local prototypes */
  55
  56 static UINT32
  57 AcpiPsGetNextPackageLength (
  58     ACPI_PARSE_STATE        *ParserState);
  59
  60 static ACPI_PARSE_OBJECT *
  61 AcpiPsGetNextField (
  62     ACPI_PARSE_STATE        *ParserState);
  63
  64
  65 /*******************************************************************************
  66  *
  67  * FUNCTION:    AcpiPsGetNextPackageLength
  68  *
  69  * PARAMETERS:  ParserState         - Current parser state object
  70  *
  71  * RETURN:      Decoded package length. On completion, the AML pointer points
  72  *              past the length byte or bytes.
  73  *
  74  * DESCRIPTION: Decode and return a package length field.
  75  *              Note: Largest package length is 28 bits, from ACPI specification
  76  *
  77  ******************************************************************************/
  78
  79 static UINT32
  80 AcpiPsGetNextPackageLength (
  81     ACPI_PARSE_STATE        *ParserState)
  82 {
  83     UINT8                   *Aml = ParserState->Aml;
  84     UINT32                  PackageLength = 0;
  85     UINT32                  ByteCount;
  86     UINT8                   ByteZeroMask = 0x3F; /* Default [0:5] */
  87
  88
  89     ACPI_FUNCTION_TRACE (PsGetNextPackageLength);
  90
  91
  92     /*
  93      * Byte 0 bits [6:7] contain the number of additional bytes
  94      * used to encode the package length, either 0,1,2, or 3
  95      */
  96     ByteCount = (Aml[0] >> 6);
  97     ParserState->Aml += ((ACPI_SIZE) ByteCount + 1);
  98
  99     /* Get bytes 3, 2, 1 as needed */
 100
 101     while (ByteCount)
 102     {
 103         /*
 104          * Final bit positions for the package length bytes:
 105          *      Byte3->[20:27]
 106          *      Byte2->[12:19]
 107          *      Byte1->[04:11]
 108          *      Byte0->[00:03]
 109          */
 110         PackageLength |= (Aml[ByteCount] << ((ByteCount << 3) - 4));
 111
 112         ByteZeroMask = 0x0F; /* Use bits [0:3] of byte 0 */
 113         ByteCount--;
 114     }
 115
 116     /* Byte 0 is a special case, either bits [0:3] or [0:5] are used */
 117
 118     PackageLength |= (Aml[0] & ByteZeroMask);
 119     return_UINT32 (PackageLength);
 120 }
 121
 122
 123 /*******************************************************************************
 124  *
 125  * FUNCTION:    AcpiPsGetNextPackageEnd
 126  *
 127  * PARAMETERS:  ParserState         - Current parser state object
 128  *
 129  * RETURN:      Pointer to end-of-package +1
 130  *
 131  * DESCRIPTION: Get next package length and return a pointer past the end of
 132  *              the package. Consumes the package length field
 133  *
 134  ******************************************************************************/
 135
 136 UINT8 *
 137 AcpiPsGetNextPackageEnd (
 138     ACPI_PARSE_STATE        *ParserState)
 139 {
 140     UINT8                   *Start = ParserState->Aml;
 141     UINT32                  PackageLength;
 142
 143
 144     ACPI_FUNCTION_TRACE (PsGetNextPackageEnd);
 145
 146
 147     /* Function below updates ParserState->Aml */
 148
 149     PackageLength = AcpiPsGetNextPackageLength (ParserState);
 150
 151     return_PTR (Start + PackageLength); /* end of package */
 152 }
 153
 154
 155 /*******************************************************************************
 156  *
 157  * FUNCTION:    AcpiPsGetNextNamestring
 158  *
 159  * PARAMETERS:  ParserState         - Current parser state object
 160  *
 161  * RETURN:      Pointer to the start of the name string (pointer points into
 162  *              the AML.
 163  *
 164  * DESCRIPTION: Get next raw namestring within the AML stream. Handles all name
 165  *              prefix characters. Set parser state to point past the string.
 166  *              (Name is consumed from the AML.)
 167  *
 168  ******************************************************************************/
 169
 170 char *
 171 AcpiPsGetNextNamestring (
 172     ACPI_PARSE_STATE        *ParserState)
 173 {
 174     UINT8                   *Start = ParserState->Aml;
 175     UINT8                   *End = ParserState->Aml;
 176
 177
 178     ACPI_FUNCTION_TRACE (PsGetNextNamestring);
 179
 180
 181     /* Point past any namestring prefix characters (backslash or carat) */
 182
 183     while (ACPI_IS_ROOT_PREFIX (*End) ||
 184            ACPI_IS_PARENT_PREFIX (*End))
 185     {
 186         End++;
 187     }
 188
 189     /* Decode the path prefix character */
 190
 191     switch (*End)
 192     {
 193     case 0:
 194
 195         /* NullName */
 196
 197         if (End == Start)
 198         {
 199             Start = NULL;
 200         }
 201         End++;
 202         break;
 203
 204     case AML_DUAL_NAME_PREFIX:
 205
 206         /* Two name segments */
 207
 208         End += 1 + (2 * ACPI_NAME_SIZE);
 209         break;
 210
 211     case AML_MULTI_NAME_PREFIX_OP:
 212
 213         /* Multiple name segments, 4 chars each, count in next byte */
 214
 215         End += 2 + (*(End + 1) * ACPI_NAME_SIZE);
 216         break;
 217
 218     default:
 219
 220         /* Single name segment */
 221
 222         End += ACPI_NAME_SIZE;
 223         break;
 224     }
 225
 226     ParserState->Aml = End;
 227     return_PTR ((char *) Start);
 228 }
 229
 230
 231 /*******************************************************************************
 232  *
 233  * FUNCTION:    AcpiPsGetNextNamepath
 234  *
 235  * PARAMETERS:  ParserState         - Current parser state object
 236  *              Arg                 - Where the namepath will be stored
 237  *              ArgCount            - If the namepath points to a control method
 238  *                                    the method's argument is returned here.
 239  *              PossibleMethodCall  - Whether the namepath can possibly be the
 240  *                                    start of a method call
 241  *
 242  * RETURN:      Status
 243  *
 244  * DESCRIPTION: Get next name (if method call, return # of required args).
 245  *              Names are looked up in the internal namespace to determine
 246  *              if the name represents a control method. If a method
 247  *              is found, the number of arguments to the method is returned.
 248  *              This information is critical for parsing to continue correctly.
 249  *
 250  ******************************************************************************/
 251
 252 ACPI_STATUS
 253 AcpiPsGetNextNamepath (
 254     ACPI_WALK_STATE         *WalkState,
 255     ACPI_PARSE_STATE        *ParserState,
 256     ACPI_PARSE_OBJECT       *Arg,
 257     BOOLEAN                 PossibleMethodCall)
 258 {
 259     ACPI_STATUS             Status;
 260     char                    *Path;
 261     ACPI_PARSE_OBJECT       *NameOp;
 262     ACPI_OPERAND_OBJECT     *MethodDesc;
 263     ACPI_NAMESPACE_NODE     *Node;
 264     UINT8                   *Start = ParserState->Aml;
 265
 266
 267     ACPI_FUNCTION_TRACE (PsGetNextNamepath);
 268
 269
 270     Path = AcpiPsGetNextNamestring (ParserState);
 271     AcpiPsInitOp (Arg, AML_INT_NAMEPATH_OP);
 272
 273     /* Null path case is allowed, just exit */
 274
 275     if (!Path)
 276     {
 277         Arg->Common.Value.Name = Path;
 278         return_ACPI_STATUS (AE_OK);
 279     }
 280
 281     /*
 282      * Lookup the name in the internal namespace, starting with the current
 283      * scope. We don't want to add anything new to the namespace here,
 284      * however, so we use MODE_EXECUTE.
 285      * Allow searching of the parent tree, but don't open a new scope -
 286      * we just want to lookup the object (must be mode EXECUTE to perform
 287      * the upsearch)
 288      */
 289     Status = AcpiNsLookup (WalkState->ScopeInfo, Path,
 290         ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
 291         ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, NULL, &Node);
 292
 293     /*
 294      * If this name is a control method invocation, we must
 295      * setup the method call
 296      */
 297     if (ACPI_SUCCESS (Status) &&
 298         PossibleMethodCall &&
 299         (Node->Type == ACPI_TYPE_METHOD))
 300     {
 301         /* This name is actually a control method invocation */
 302
 303         MethodDesc = AcpiNsGetAttachedObject (Node);
 304         ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
 305             "Control Method invocation %4.4s - %p Desc %p Path=%p\n",
 306             Node->Name.Ascii, Node, MethodDesc, Path));
 307
 308         NameOp = AcpiPsAllocOp (AML_INT_NAMEPATH_OP, Start);
 309         if (!NameOp)
 310         {
 311             return_ACPI_STATUS (AE_NO_MEMORY);
 312         }
 313
 314         /* Change Arg into a METHOD CALL and attach name to it */
 315
 316         AcpiPsInitOp (Arg, AML_INT_METHODCALL_OP);
 317         NameOp->Common.Value.Name = Path;
 318
 319         /* Point METHODCALL/NAME to the METHOD Node */
 320
 321         NameOp->Common.Node = Node;
 322         AcpiPsAppendArg (Arg, NameOp);
 323
 324         if (!MethodDesc)
 325         {
 326             ACPI_ERROR ((AE_INFO,
 327                 "Control Method %p has no attached object",
 328                 Node));
 329             return_ACPI_STATUS (AE_AML_INTERNAL);
 330         }
 331
 332         ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
 333             "Control Method - %p Args %X\n",
 334             Node, MethodDesc->Method.ParamCount));
 335
 336         /* Get the number of arguments to expect */
 337
 338         WalkState->ArgCount = MethodDesc->Method.ParamCount;
 339         return_ACPI_STATUS (AE_OK);
 340     }
 341
 342     /*
 343      * Special handling if the name was not found during the lookup -
 344      * some NotFound cases are allowed
 345      */
 346     if (Status == AE_NOT_FOUND)
 347     {
 348         /* 1) NotFound is ok during load pass 1/2 (allow forward references) */
 349
 350         if ((WalkState->ParseFlags & ACPI_PARSE_MODE_MASK) !=
 351             ACPI_PARSE_EXECUTE)
 352         {
 353             Status = AE_OK;
 354         }
 355
 356         /* 2) NotFound during a CondRefOf(x) is ok by definition */
 357
 358         else if (WalkState->Op->Common.AmlOpcode == AML_COND_REF_OF_OP)
 359         {
 360             Status = AE_OK;
 361         }
 362
 363         /*
 364          * 3) NotFound while building a Package is ok at this point, we
 365          * may flag as an error later if slack mode is not enabled.
 366          * (Some ASL code depends on allowing this behavior)
 367          */
 368         else if ((Arg->Common.Parent) &&
 369             ((Arg->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
 370              (Arg->Common.Parent->Common.AmlOpcode == AML_VAR_PACKAGE_OP)))
 371         {
 372             Status = AE_OK;
 373         }
 374     }
 375
 376     /* Final exception check (may have been changed from code above) */
 377
 378     if (ACPI_FAILURE (Status))
 379     {
 380         ACPI_ERROR_NAMESPACE (Path, Status);
 381
 382         if ((WalkState->ParseFlags & ACPI_PARSE_MODE_MASK) ==
 383             ACPI_PARSE_EXECUTE)
 384         {
 385             /* Report a control method execution error */
 386
 387             Status = AcpiDsMethodError (Status, WalkState);
 388         }
 389     }
 390
 391     /* Save the namepath */
 392
 393     Arg->Common.Value.Name = Path;
 394     return_ACPI_STATUS (Status);
 395 }
 396
 397
 398 /*******************************************************************************
 399  *
 400  * FUNCTION:    AcpiPsGetNextSimpleArg
 401  *
 402  * PARAMETERS:  ParserState         - Current parser state object
 403  *              ArgType             - The argument type (AML_*_ARG)
 404  *              Arg                 - Where the argument is returned
 405  *
 406  * RETURN:      None
 407  *
 408  * DESCRIPTION: Get the next simple argument (constant, string, or namestring)
 409  *
 410  ******************************************************************************/
 411
 412 void
 413 AcpiPsGetNextSimpleArg (
 414     ACPI_PARSE_STATE        *ParserState,
 415     UINT32                  ArgType,
 416     ACPI_PARSE_OBJECT       *Arg)
 417 {
 418     UINT32                  Length;
 419     UINT16                  Opcode;
 420     UINT8                   *Aml = ParserState->Aml;
 421
 422
 423     ACPI_FUNCTION_TRACE_U32 (PsGetNextSimpleArg, ArgType);
 424
 425
 426     switch (ArgType)
 427     {
 428     case ARGP_BYTEDATA:
 429
 430         /* Get 1 byte from the AML stream */
 431
 432         Opcode = AML_BYTE_OP;
 433         Arg->Common.Value.Integer = (UINT64) *Aml;
 434         Length = 1;
 435         break;
 436
 437     case ARGP_WORDDATA:
 438
 439         /* Get 2 bytes from the AML stream */
 440
 441         Opcode = AML_WORD_OP;
 442         ACPI_MOVE_16_TO_64 (&Arg->Common.Value.Integer, Aml);
 443         Length = 2;
 444         break;
 445
 446     case ARGP_DWORDDATA:
 447
 448         /* Get 4 bytes from the AML stream */
 449
 450         Opcode = AML_DWORD_OP;
 451         ACPI_MOVE_32_TO_64 (&Arg->Common.Value.Integer, Aml);
 452         Length = 4;
 453         break;
 454
 455     case ARGP_QWORDDATA:
 456
 457         /* Get 8 bytes from the AML stream */
 458
 459         Opcode = AML_QWORD_OP;
 460         ACPI_MOVE_64_TO_64 (&Arg->Common.Value.Integer, Aml);
 461         Length = 8;
 462         break;
 463
 464     case ARGP_CHARLIST:
 465
 466         /* Get a pointer to the string, point past the string */
 467
 468         Opcode = AML_STRING_OP;
 469         Arg->Common.Value.String = ACPI_CAST_PTR (char, Aml);
 470
 471         /* Find the null terminator */
 472
 473         Length = 0;
 474         while (Aml[Length])
 475         {
 476             Length++;
 477         }
 478         Length++;
 479         break;
 480
 481     case ARGP_NAME:
 482     case ARGP_NAMESTRING:
 483
 484         AcpiPsInitOp (Arg, AML_INT_NAMEPATH_OP);
 485         Arg->Common.Value.Name = AcpiPsGetNextNamestring (ParserState);
 486         return_VOID;
 487
 488     default:
 489
 490         ACPI_ERROR ((AE_INFO, "Invalid ArgType 0x%X", ArgType));
 491         return_VOID;
 492     }
 493
 494     AcpiPsInitOp (Arg, Opcode);
 495     ParserState->Aml += Length;
 496     return_VOID;
 497 }
 498
 499
 500 /*******************************************************************************
 501  *
 502  * FUNCTION:    AcpiPsGetNextField
 503  *
 504  * PARAMETERS:  ParserState         - Current parser state object
 505  *
 506  * RETURN:      A newly allocated FIELD op
 507  *
 508  * DESCRIPTION: Get next field (NamedField, ReservedField, or AccessField)
 509  *
 510  ******************************************************************************/
 511
 512 static ACPI_PARSE_OBJECT *
 513 AcpiPsGetNextField (
 514     ACPI_PARSE_STATE        *ParserState)
 515 {
 516     UINT8                   *Aml;
 517     ACPI_PARSE_OBJECT       *Field;
 518     ACPI_PARSE_OBJECT       *Arg = NULL;
 519     UINT16                  Opcode;
 520     UINT32                  Name;
 521     UINT8                   AccessType;
 522     UINT8                   AccessAttribute;
 523     UINT8                   AccessLength;
 524     UINT32                  PkgLength;
 525     UINT8                   *PkgEnd;
 526     UINT32                  BufferLength;
 527
 528
 529     ACPI_FUNCTION_TRACE (PsGetNextField);
 530
 531
 532     Aml = ParserState->Aml;
 533
 534     /* Determine field type */
 535
 536     switch (ACPI_GET8 (ParserState->Aml))
 537     {
 538     case AML_FIELD_OFFSET_OP:
 539
 540         Opcode = AML_INT_RESERVEDFIELD_OP;
 541         ParserState->Aml++;
 542         break;
 543
 544     case AML_FIELD_ACCESS_OP:
 545
 546         Opcode = AML_INT_ACCESSFIELD_OP;
 547         ParserState->Aml++;
 548         break;
 549
 550     case AML_FIELD_CONNECTION_OP:
 551
 552         Opcode = AML_INT_CONNECTION_OP;
 553         ParserState->Aml++;
 554         break;
 555
 556     case AML_FIELD_EXT_ACCESS_OP:
 557
 558         Opcode = AML_INT_EXTACCESSFIELD_OP;
 559         ParserState->Aml++;
 560         break;
 561
 562     default:
 563
 564         Opcode = AML_INT_NAMEDFIELD_OP;
 565         break;
 566     }
 567
 568     /* Allocate a new field op */
 569
 570     Field = AcpiPsAllocOp (Opcode, Aml);
 571     if (!Field)
 572     {
 573         return_PTR (NULL);
 574     }
 575
 576     /* Decode the field type */
 577
 578     switch (Opcode)
 579     {
 580     case AML_INT_NAMEDFIELD_OP:
 581
 582         /* Get the 4-character name */
 583
 584         ACPI_MOVE_32_TO_32 (&Name, ParserState->Aml);
 585         AcpiPsSetName (Field, Name);
 586         ParserState->Aml += ACPI_NAME_SIZE;
 587
 588         /* Get the length which is encoded as a package length */
 589
 590         Field->Common.Value.Size = AcpiPsGetNextPackageLength (ParserState);
 591         break;
 592
 593
 594     case AML_INT_RESERVEDFIELD_OP:
 595
 596         /* Get the length which is encoded as a package length */
 597
 598         Field->Common.Value.Size = AcpiPsGetNextPackageLength (ParserState);
 599         break;
 600
 601
 602     case AML_INT_ACCESSFIELD_OP:
 603     case AML_INT_EXTACCESSFIELD_OP:
 604
 605         /*
 606          * Get AccessType and AccessAttrib and merge into the field Op
 607          * AccessType is first operand, AccessAttribute is second. stuff
 608          * these bytes into the node integer value for convenience.
 609          */
 610
 611         /* Get the two bytes (Type/Attribute) */
 612
 613         AccessType = ACPI_GET8 (ParserState->Aml);
 614         ParserState->Aml++;
 615         AccessAttribute = ACPI_GET8 (ParserState->Aml);
 616         ParserState->Aml++;
 617
 618         Field->Common.Value.Integer = (UINT8) AccessType;
 619         Field->Common.Value.Integer |= (UINT16) (AccessAttribute << 8);
 620
 621         /* This opcode has a third byte, AccessLength */
 622
 623         if (Opcode == AML_INT_EXTACCESSFIELD_OP)
 624         {
 625             AccessLength = ACPI_GET8 (ParserState->Aml);
 626             ParserState->Aml++;
 627
 628             Field->Common.Value.Integer |= (UINT32) (AccessLength << 16);
 629         }
 630         break;
 631
 632
 633     case AML_INT_CONNECTION_OP:
 634
 635         /*
 636          * Argument for Connection operator can be either a Buffer
 637          * (resource descriptor), or a NameString.
 638          */
 639         Aml = ParserState->Aml;
 640         if (ACPI_GET8 (ParserState->Aml) == AML_BUFFER_OP)
 641         {
 642             ParserState->Aml++;
 643
 644             PkgEnd = ParserState->Aml;
 645             PkgLength = AcpiPsGetNextPackageLength (ParserState);
 646             PkgEnd += PkgLength;
 647
 648             if (ParserState->Aml < PkgEnd)
 649             {
 650                 /* Non-empty list */
 651
 652                 Arg = AcpiPsAllocOp (AML_INT_BYTELIST_OP, Aml);
 653                 if (!Arg)
 654                 {
 655                     AcpiPsFreeOp (Field);
 656                     return_PTR (NULL);
 657                 }
 658
 659                 /* Get the actual buffer length argument */
 660
 661                 Opcode = ACPI_GET8 (ParserState->Aml);
 662                 ParserState->Aml++;
 663
 664                 switch (Opcode)
 665                 {
 666                 case AML_BYTE_OP:       /* AML_BYTEDATA_ARG */
 667
 668                     BufferLength = ACPI_GET8 (ParserState->Aml);
 669                     ParserState->Aml += 1;
 670                     break;
 671
 672                 case AML_WORD_OP:       /* AML_WORDDATA_ARG */
 673
 674                     BufferLength = ACPI_GET16 (ParserState->Aml);
 675                     ParserState->Aml += 2;
 676                     break;
 677
 678                 case AML_DWORD_OP:      /* AML_DWORDATA_ARG */
 679
 680                     BufferLength = ACPI_GET32 (ParserState->Aml);
 681                     ParserState->Aml += 4;
 682                     break;
 683
 684                 default:
 685
 686                     BufferLength = 0;
 687                     break;
 688                 }
 689
 690                 /* Fill in bytelist data */
 691
 692                 Arg->Named.Value.Size = BufferLength;
 693                 Arg->Named.Data = ParserState->Aml;
 694             }
 695
 696             /* Skip to End of byte data */
 697
 698             ParserState->Aml = PkgEnd;
 699         }
 700         else
 701         {
 702             Arg = AcpiPsAllocOp (AML_INT_NAMEPATH_OP, Aml);
 703             if (!Arg)
 704             {
 705                 AcpiPsFreeOp (Field);
 706                 return_PTR (NULL);
 707             }
 708
 709             /* Get the Namestring argument */
 710
 711             Arg->Common.Value.Name = AcpiPsGetNextNamestring (ParserState);
 712         }
 713
 714         /* Link the buffer/namestring to parent (CONNECTION_OP) */
 715
 716         AcpiPsAppendArg (Field, Arg);
 717         break;
 718
 719
 720     default:
 721
 722         /* Opcode was set in previous switch */
 723         break;
 724     }
 725
 726     return_PTR (Field);
 727 }
 728
 729
 730 /*******************************************************************************
 731  *
 732  * FUNCTION:    AcpiPsGetNextArg
 733  *
 734  * PARAMETERS:  WalkState           - Current state
 735  *              ParserState         - Current parser state object
 736  *              ArgType             - The argument type (AML_*_ARG)
 737  *              ReturnArg           - Where the next arg is returned
 738  *
 739  * RETURN:      Status, and an op object containing the next argument.
 740  *
 741  * DESCRIPTION: Get next argument (including complex list arguments that require
 742  *              pushing the parser stack)
 743  *
 744  ******************************************************************************/
 745
 746 ACPI_STATUS
 747 AcpiPsGetNextArg (
 748     ACPI_WALK_STATE         *WalkState,
 749     ACPI_PARSE_STATE        *ParserState,
 750     UINT32                  ArgType,
 751     ACPI_PARSE_OBJECT       **ReturnArg)
 752 {
 753     ACPI_PARSE_OBJECT       *Arg = NULL;
 754     ACPI_PARSE_OBJECT       *Prev = NULL;
 755     ACPI_PARSE_OBJECT       *Field;
 756     UINT32                  Subop;
 757     ACPI_STATUS             Status = AE_OK;
 758
 759
 760     ACPI_FUNCTION_TRACE_PTR (PsGetNextArg, ParserState);
 761
 762
 763     ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
 764         "Expected argument type ARGP: %s (%2.2X)\n",
 765         AcpiUtGetArgumentTypeName (ArgType), ArgType));
 766
 767     switch (ArgType)
 768     {
 769     case ARGP_BYTEDATA:
 770     case ARGP_WORDDATA:
 771     case ARGP_DWORDDATA:
 772     case ARGP_CHARLIST:
 773     case ARGP_NAME:
 774     case ARGP_NAMESTRING:
 775
 776         /* Constants, strings, and namestrings are all the same size */
 777
 778         Arg = AcpiPsAllocOp (AML_BYTE_OP, ParserState->Aml);
 779         if (!Arg)
 780         {
 781             return_ACPI_STATUS (AE_NO_MEMORY);
 782         }
 783
 784         AcpiPsGetNextSimpleArg (ParserState, ArgType, Arg);
 785         break;
 786
 787     case ARGP_PKGLENGTH:
 788
 789         /* Package length, nothing returned */
 790
 791         ParserState->PkgEnd = AcpiPsGetNextPackageEnd (ParserState);
 792         break;
 793
 794     case ARGP_FIELDLIST:
 795
 796         if (ParserState->Aml < ParserState->PkgEnd)
 797         {
 798             /* Non-empty list */
 799
 800             while (ParserState->Aml < ParserState->PkgEnd)
 801             {
 802                 Field = AcpiPsGetNextField (ParserState);
 803                 if (!Field)
 804                 {
 805                     return_ACPI_STATUS (AE_NO_MEMORY);
 806                 }
 807
 808                 if (Prev)
 809                 {
 810                     Prev->Common.Next = Field;
 811                 }
 812                 else
 813                 {
 814                     Arg = Field;
 815                 }
 816                 Prev = Field;
 817             }
 818
 819             /* Skip to End of byte data */
 820
 821             ParserState->Aml = ParserState->PkgEnd;
 822         }
 823         break;
 824
 825     case ARGP_BYTELIST:
 826
 827         if (ParserState->Aml < ParserState->PkgEnd)
 828         {
 829             /* Non-empty list */
 830
 831             Arg = AcpiPsAllocOp (AML_INT_BYTELIST_OP,
 832                 ParserState->Aml);
 833             if (!Arg)
 834             {
 835                 return_ACPI_STATUS (AE_NO_MEMORY);
 836             }
 837
 838             /* Fill in bytelist data */
 839
 840             Arg->Common.Value.Size = (UINT32)
 841                 ACPI_PTR_DIFF (ParserState->PkgEnd, ParserState->Aml);
 842             Arg->Named.Data = ParserState->Aml;
 843
 844             /* Skip to End of byte data */
 845
 846             ParserState->Aml = ParserState->PkgEnd;
 847         }
 848         break;
 849
 850     case ARGP_SIMPLENAME:
 851     case ARGP_NAME_OR_REF:
 852
 853         ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
 854             "**** SimpleName/NameOrRef: %s (%2.2X)\n",
 855             AcpiUtGetArgumentTypeName (ArgType), ArgType));
 856
 857         Subop = AcpiPsPeekOpcode (ParserState);
 858         if (Subop == 0                  ||
 859             AcpiPsIsLeadingChar (Subop) ||
 860             ACPI_IS_ROOT_PREFIX (Subop) ||
 861             ACPI_IS_PARENT_PREFIX (Subop))
 862         {
 863             /* NullName or NameString */
 864
 865             Arg = AcpiPsAllocOp (AML_INT_NAMEPATH_OP, ParserState->Aml);
 866             if (!Arg)
 867             {
 868                 return_ACPI_STATUS (AE_NO_MEMORY);
 869             }
 870
 871             Status = AcpiPsGetNextNamepath (WalkState, ParserState,
 872                 Arg, ACPI_NOT_METHOD_CALL);
 873         }
 874         else
 875         {
 876             /* Single complex argument, nothing returned */
 877
 878             WalkState->ArgCount = 1;
 879         }
 880         break;
 881
 882     case ARGP_TARGET:
 883     case ARGP_SUPERNAME:
 884
 885         ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
 886             "**** Target/Supername: %s (%2.2X)\n",
 887             AcpiUtGetArgumentTypeName (ArgType), ArgType));
 888
 889         Subop = AcpiPsPeekOpcode (ParserState);
 890         if (Subop == 0)
 891         {
 892             /* NULL target (zero). Convert to a NULL namepath */
 893
 894             Arg = AcpiPsAllocOp (AML_INT_NAMEPATH_OP, ParserState->Aml);
 895             if (!Arg)
 896             {
 897                 return_ACPI_STATUS (AE_NO_MEMORY);
 898             }
 899
 900             Status = AcpiPsGetNextNamepath (WalkState, ParserState,
 901                 Arg, ACPI_POSSIBLE_METHOD_CALL);
 902         }
 903         else
 904         {
 905             /* Single complex argument, nothing returned */
 906
 907             WalkState->ArgCount = 1;
 908         }
 909         break;
 910
 911     case ARGP_DATAOBJ:
 912     case ARGP_TERMARG:
 913
 914
 915     ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
 916         "**** TermArg/DataObj: %s (%2.2X)\n",
 917         AcpiUtGetArgumentTypeName (ArgType), ArgType));
 918
 919         /* Single complex argument, nothing returned */
 920
 921         WalkState->ArgCount = 1;
 922         break;
 923
 924     case ARGP_DATAOBJLIST:
 925     case ARGP_TERMLIST:
 926     case ARGP_OBJLIST:
 927
 928         if (ParserState->Aml < ParserState->PkgEnd)
 929         {
 930             /* Non-empty list of variable arguments, nothing returned */
 931
 932             WalkState->ArgCount = ACPI_VAR_ARGS;
 933         }
 934         break;
 935
 936     default:
 937
 938         ACPI_ERROR ((AE_INFO, "Invalid ArgType: 0x%X", ArgType));
 939         Status = AE_AML_OPERAND_TYPE;
 940         break;
 941     }
 942
 943     *ReturnArg = Arg;
 944     return_ACPI_STATUS (Status);
 945 }