1 /****************************************************************************** 2 * 3 * Module Name: psargs - Parse AML opcode arguments 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2014, 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 <contrib/dev/acpica/include/acpi.h> 47 #include <contrib/dev/acpica/include/accommon.h> 48 #include <contrib/dev/acpica/include/acparser.h> 49 #include <contrib/dev/acpica/include/amlcode.h> 50 #include <contrib/dev/acpica/include/acnamesp.h> 51 #include <contrib/dev/acpica/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 } 936