1 /******************************************************************************
2 *
3 * Module Name: psargs - Parse AML opcode arguments
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2011, 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 (AcpiPsIsPrefixChar (*End))
186 {
187 End++;
188 }
189
190 /* Decode the path prefix character */
191
192 switch (*End)
193 {
194 case 0:
195
196 /* NullName */
197
198 if (End == Start)
199 {
200 Start = NULL;
201 }
202 End++;
203 break;
204
205 case AML_DUAL_NAME_PREFIX:
206
207 /* Two name segments */
208
209 End += 1 + (2 * ACPI_NAME_SIZE);
210 break;
211
212 case AML_MULTI_NAME_PREFIX_OP:
213
214 /* Multiple name segments, 4 chars each, count in next byte */
215
216 End += 2 + (*(End + 1) * ACPI_NAME_SIZE);
217 break;
218
219 default:
220
221 /* Single name segment */
222
223 End += ACPI_NAME_SIZE;
224 break;
225 }
226
227 ParserState->Aml = End;
228 return_PTR ((char *) Start);
229 }
230
231
232 /*******************************************************************************
233 *
234 * FUNCTION: AcpiPsGetNextNamepath
235 *
236 * PARAMETERS: ParserState - Current parser state object
237 * Arg - Where the namepath will be stored
238 * ArgCount - If the namepath points to a control method
239 * the method's argument is returned here.
240 * PossibleMethodCall - Whether the namepath can possibly be the
241 * start of a method call
242 *
243 * RETURN: Status
244 *
245 * DESCRIPTION: Get next name (if method call, return # of required args).
246 * Names are looked up in the internal namespace to determine
247 * if the name represents a control method. If a method
248 * is found, the number of arguments to the method is returned.
249 * This information is critical for parsing to continue correctly.
250 *
251 ******************************************************************************/
252
253 ACPI_STATUS
254 AcpiPsGetNextNamepath (
255 ACPI_WALK_STATE *WalkState,
256 ACPI_PARSE_STATE *ParserState,
257 ACPI_PARSE_OBJECT *Arg,
258 BOOLEAN PossibleMethodCall)
259 {
260 ACPI_STATUS Status;
261 char *Path;
262 ACPI_PARSE_OBJECT *NameOp;
263 ACPI_OPERAND_OBJECT *MethodDesc;
264 ACPI_NAMESPACE_NODE *Node;
265 UINT8 *Start = ParserState->Aml;
266
267
268 ACPI_FUNCTION_TRACE (PsGetNextNamepath);
269
270
271 Path = AcpiPsGetNextNamestring (ParserState);
272 AcpiPsInitOp (Arg, AML_INT_NAMEPATH_OP);
273
274 /* Null path case is allowed, just exit */
275
276 if (!Path)
277 {
278 Arg->Common.Value.Name = Path;
279 return_ACPI_STATUS (AE_OK);
280 }
281
282 /*
283 * Lookup the name in the internal namespace, starting with the current
284 * scope. We don't want to add anything new to the namespace here,
285 * however, so we use MODE_EXECUTE.
286 * Allow searching of the parent tree, but don't open a new scope -
287 * we just want to lookup the object (must be mode EXECUTE to perform
288 * the upsearch)
289 */
290 Status = AcpiNsLookup (WalkState->ScopeInfo, Path,
291 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
292 ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, NULL, &Node);
293
294 /*
295 * If this name is a control method invocation, we must
296 * setup the method call
297 */
298 if (ACPI_SUCCESS (Status) &&
299 PossibleMethodCall &&
300 (Node->Type == ACPI_TYPE_METHOD))
301 {
302 if (WalkState->Opcode == AML_UNLOAD_OP)
303 {
304 /*
305 * AcpiPsGetNextNamestring has increased the AML pointer,
306 * so we need to restore the saved AML pointer for method call.
307 */
308 WalkState->ParserState.Aml = Start;
309 WalkState->ArgCount = 1;
310 AcpiPsInitOp (Arg, AML_INT_METHODCALL_OP);
311 return_ACPI_STATUS (AE_OK);
312 }
313
314 /* This name is actually a control method invocation */
315
316 MethodDesc = AcpiNsGetAttachedObject (Node);
317 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
318 "Control Method - %p Desc %p Path=%p\n", Node, MethodDesc, Path));
319
320 NameOp = AcpiPsAllocOp (AML_INT_NAMEPATH_OP);
321 if (!NameOp)
322 {
323 return_ACPI_STATUS (AE_NO_MEMORY);
324 }
325
326 /* Change Arg into a METHOD CALL and attach name to it */
327
328 AcpiPsInitOp (Arg, AML_INT_METHODCALL_OP);
329 NameOp->Common.Value.Name = Path;
330
331 /* Point METHODCALL/NAME to the METHOD Node */
332
333 NameOp->Common.Node = Node;
334 AcpiPsAppendArg (Arg, NameOp);
335
336 if (!MethodDesc)
337 {
338 ACPI_ERROR ((AE_INFO,
339 "Control Method %p has no attached object",
340 Node));
341 return_ACPI_STATUS (AE_AML_INTERNAL);
342 }
343
344 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
345 "Control Method - %p Args %X\n",
346 Node, MethodDesc->Method.ParamCount));
347
348 /* Get the number of arguments to expect */
349
350 WalkState->ArgCount = MethodDesc->Method.ParamCount;
351 return_ACPI_STATUS (AE_OK);
352 }
353
354 /*
355 * Special handling if the name was not found during the lookup -
356 * some NotFound cases are allowed
357 */
358 if (Status == AE_NOT_FOUND)
359 {
360 /* 1) NotFound is ok during load pass 1/2 (allow forward references) */
361
362 if ((WalkState->ParseFlags & ACPI_PARSE_MODE_MASK) !=
363 ACPI_PARSE_EXECUTE)
364 {
365 Status = AE_OK;
366 }
367
368 /* 2) NotFound during a CondRefOf(x) is ok by definition */
369
370 else if (WalkState->Op->Common.AmlOpcode == AML_COND_REF_OF_OP)
371 {
372 Status = AE_OK;
373 }
374
375 /*
376 * 3) NotFound while building a Package is ok at this point, we
377 * may flag as an error later if slack mode is not enabled.
378 * (Some ASL code depends on allowing this behavior)
379 */
380 else if ((Arg->Common.Parent) &&
381 ((Arg->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
382 (Arg->Common.Parent->Common.AmlOpcode == AML_VAR_PACKAGE_OP)))
383 {
384 Status = AE_OK;
385 }
386 }
387
388 /* Final exception check (may have been changed from code above) */
389
390 if (ACPI_FAILURE (Status))
391 {
392 ACPI_ERROR_NAMESPACE (Path, Status);
393
394 if ((WalkState->ParseFlags & ACPI_PARSE_MODE_MASK) ==
395 ACPI_PARSE_EXECUTE)
396 {
397 /* Report a control method execution error */
398
399 Status = AcpiDsMethodError (Status, WalkState);
400 }
401 }
402
403 /* Save the namepath */
404
405 Arg->Common.Value.Name = Path;
406 return_ACPI_STATUS (Status);
407 }
408
409
410 /*******************************************************************************
411 *
412 * FUNCTION: AcpiPsGetNextSimpleArg
413 *
414 * PARAMETERS: ParserState - Current parser state object
415 * ArgType - The argument type (AML_*_ARG)
416 * Arg - Where the argument is returned
417 *
418 * RETURN: None
419 *
420 * DESCRIPTION: Get the next simple argument (constant, string, or namestring)
421 *
422 ******************************************************************************/
423
424 void
425 AcpiPsGetNextSimpleArg (
426 ACPI_PARSE_STATE *ParserState,
427 UINT32 ArgType,
428 ACPI_PARSE_OBJECT *Arg)
429 {
430 UINT32 Length;
431 UINT16 Opcode;
432 UINT8 *Aml = ParserState->Aml;
433
434
435 ACPI_FUNCTION_TRACE_U32 (PsGetNextSimpleArg, ArgType);
436
437
438 switch (ArgType)
439 {
440 case ARGP_BYTEDATA:
441
442 /* Get 1 byte from the AML stream */
443
444 Opcode = AML_BYTE_OP;
445 Arg->Common.Value.Integer = (UINT64) *Aml;
446 Length = 1;
447 break;
448
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
460 case ARGP_DWORDDATA:
461
462 /* Get 4 bytes from the AML stream */
463
464 Opcode = AML_DWORD_OP;
465 ACPI_MOVE_32_TO_64 (&Arg->Common.Value.Integer, Aml);
466 Length = 4;
467 break;
468
469
470 case ARGP_QWORDDATA:
471
472 /* Get 8 bytes from the AML stream */
473
474 Opcode = AML_QWORD_OP;
475 ACPI_MOVE_64_TO_64 (&Arg->Common.Value.Integer, Aml);
476 Length = 8;
477 break;
478
479
480 case ARGP_CHARLIST:
481
482 /* Get a pointer to the string, point past the string */
483
484 Opcode = AML_STRING_OP;
485 Arg->Common.Value.String = ACPI_CAST_PTR (char, Aml);
486
487 /* Find the null terminator */
488
489 Length = 0;
490 while (Aml[Length])
491 {
492 Length++;
493 }
494 Length++;
495 break;
496
497
498 case ARGP_NAME:
499 case ARGP_NAMESTRING:
500
501 AcpiPsInitOp (Arg, AML_INT_NAMEPATH_OP);
502 Arg->Common.Value.Name = AcpiPsGetNextNamestring (ParserState);
503 return_VOID;
504
505
506 default:
507
508 ACPI_ERROR ((AE_INFO, "Invalid ArgType 0x%X", ArgType));
509 return_VOID;
510 }
511
512 AcpiPsInitOp (Arg, Opcode);
513 ParserState->Aml += Length;
514 return_VOID;
515 }
516
517
518 /*******************************************************************************
519 *
520 * FUNCTION: AcpiPsGetNextField
521 *
522 * PARAMETERS: ParserState - Current parser state object
523 *
524 * RETURN: A newly allocated FIELD op
525 *
526 * DESCRIPTION: Get next field (NamedField, ReservedField, or AccessField)
527 *
528 ******************************************************************************/
529
530 static ACPI_PARSE_OBJECT *
531 AcpiPsGetNextField (
532 ACPI_PARSE_STATE *ParserState)
533 {
534 UINT32 AmlOffset = (UINT32)
535 ACPI_PTR_DIFF (ParserState->Aml,
536 ParserState->AmlStart);
537 ACPI_PARSE_OBJECT *Field;
538 UINT16 Opcode;
539 UINT32 Name;
540
541
542 ACPI_FUNCTION_TRACE (PsGetNextField);
543
544
545 /* Determine field type */
546
547 switch (ACPI_GET8 (ParserState->Aml))
548 {
549 default:
550
551 Opcode = AML_INT_NAMEDFIELD_OP;
552 break;
553
554 case 0x00:
555
556 Opcode = AML_INT_RESERVEDFIELD_OP;
557 ParserState->Aml++;
558 break;
559
560 case 0x01:
561
562 Opcode = AML_INT_ACCESSFIELD_OP;
563 ParserState->Aml++;
564 break;
565 }
566
567 /* Allocate a new field op */
568
569 Field = AcpiPsAllocOp (Opcode);
570 if (!Field)
571 {
572 return_PTR (NULL);
573 }
574
575 Field->Common.AmlOffset = AmlOffset;
576
577 /* Decode the field type */
578
579 switch (Opcode)
580 {
581 case AML_INT_NAMEDFIELD_OP:
582
583 /* Get the 4-character name */
584
585 ACPI_MOVE_32_TO_32 (&Name, ParserState->Aml);
586 AcpiPsSetName (Field, Name);
587 ParserState->Aml += ACPI_NAME_SIZE;
588
589 /* Get the length which is encoded as a package length */
590
591 Field->Common.Value.Size = AcpiPsGetNextPackageLength (ParserState);
592 break;
593
594
595 case AML_INT_RESERVEDFIELD_OP:
596
597 /* Get the length which is encoded as a package length */
598
599 Field->Common.Value.Size = AcpiPsGetNextPackageLength (ParserState);
600 break;
601
602
603 case AML_INT_ACCESSFIELD_OP:
604
605 /*
606 * Get AccessType and AccessAttrib and merge into the field Op
607 * AccessType is first operand, AccessAttribute is second
608 */
609 Field->Common.Value.Integer = (((UINT32) ACPI_GET8 (ParserState->Aml) << 8));
610 ParserState->Aml++;
611 Field->Common.Value.Integer |= ACPI_GET8 (ParserState->Aml);
612 ParserState->Aml++;
613 break;
614
615 default:
616
617 /* Opcode was set in previous switch */
618 break;
619 }
620
621 return_PTR (Field);
622 }
623
624
625 /*******************************************************************************
626 *
627 * FUNCTION: AcpiPsGetNextArg
628 *
629 * PARAMETERS: WalkState - Current state
630 * ParserState - Current parser state object
631 * ArgType - The argument type (AML_*_ARG)
632 * ReturnArg - Where the next arg is returned
633 *
634 * RETURN: Status, and an op object containing the next argument.
635 *
636 * DESCRIPTION: Get next argument (including complex list arguments that require
637 * pushing the parser stack)
638 *
639 ******************************************************************************/
640
641 ACPI_STATUS
642 AcpiPsGetNextArg (
643 ACPI_WALK_STATE *WalkState,
644 ACPI_PARSE_STATE *ParserState,
645 UINT32 ArgType,
646 ACPI_PARSE_OBJECT **ReturnArg)
647 {
648 ACPI_PARSE_OBJECT *Arg = NULL;
649 ACPI_PARSE_OBJECT *Prev = NULL;
650 ACPI_PARSE_OBJECT *Field;
651 UINT32 Subop;
652 ACPI_STATUS Status = AE_OK;
653
654
655 ACPI_FUNCTION_TRACE_PTR (PsGetNextArg, ParserState);
656
657
658 switch (ArgType)
659 {
660 case ARGP_BYTEDATA:
661 case ARGP_WORDDATA:
662 case ARGP_DWORDDATA:
663 case ARGP_CHARLIST:
664 case ARGP_NAME:
665 case ARGP_NAMESTRING:
666
667 /* Constants, strings, and namestrings are all the same size */
668
669 Arg = AcpiPsAllocOp (AML_BYTE_OP);
670 if (!Arg)
671 {
672 return_ACPI_STATUS (AE_NO_MEMORY);
673 }
674 AcpiPsGetNextSimpleArg (ParserState, ArgType, Arg);
675 break;
676
677
678 case ARGP_PKGLENGTH:
679
680 /* Package length, nothing returned */
681
682 ParserState->PkgEnd = AcpiPsGetNextPackageEnd (ParserState);
683 break;
684
685
686 case ARGP_FIELDLIST:
687
688 if (ParserState->Aml < ParserState->PkgEnd)
689 {
690 /* Non-empty list */
691
692 while (ParserState->Aml < ParserState->PkgEnd)
693 {
694 Field = AcpiPsGetNextField (ParserState);
695 if (!Field)
696 {
697 return_ACPI_STATUS (AE_NO_MEMORY);
698 }
699
700 if (Prev)
701 {
702 Prev->Common.Next = Field;
703 }
704 else
705 {
706 Arg = Field;
707 }
708 Prev = Field;
709 }
710
711 /* Skip to End of byte data */
712
713 ParserState->Aml = ParserState->PkgEnd;
714 }
715 break;
716
717
718 case ARGP_BYTELIST:
719
720 if (ParserState->Aml < ParserState->PkgEnd)
721 {
722 /* Non-empty list */
723
724 Arg = AcpiPsAllocOp (AML_INT_BYTELIST_OP);
725 if (!Arg)
726 {
727 return_ACPI_STATUS (AE_NO_MEMORY);
728 }
729
730 /* Fill in bytelist data */
731
732 Arg->Common.Value.Size = (UINT32)
733 ACPI_PTR_DIFF (ParserState->PkgEnd, ParserState->Aml);
734 Arg->Named.Data = ParserState->Aml;
735
736 /* Skip to End of byte data */
737
738 ParserState->Aml = ParserState->PkgEnd;
739 }
740 break;
741
742
743 case ARGP_TARGET:
744 case ARGP_SUPERNAME:
745 case ARGP_SIMPLENAME:
746
747 Subop = AcpiPsPeekOpcode (ParserState);
748 if (Subop == 0 ||
749 AcpiPsIsLeadingChar (Subop) ||
750 AcpiPsIsPrefixChar (Subop))
751 {
752 /* NullName or NameString */
753
754 Arg = AcpiPsAllocOp (AML_INT_NAMEPATH_OP);
755 if (!Arg)
756 {
757 return_ACPI_STATUS (AE_NO_MEMORY);
758 }
759
760 /* To support SuperName arg of Unload */
761
762 if (WalkState->Opcode == AML_UNLOAD_OP)
763 {
764 Status = AcpiPsGetNextNamepath (WalkState, ParserState, Arg, 1);
765
766 /*
767 * If the SuperName arg of Unload is a method call,
768 * we have restored the AML pointer, just free this Arg
769 */
770 if (Arg->Common.AmlOpcode == AML_INT_METHODCALL_OP)
771 {
772 AcpiPsFreeOp (Arg);
773 Arg = NULL;
774 }
775 }
776 else
777 {
778 Status = AcpiPsGetNextNamepath (WalkState, ParserState, Arg, 0);
779 }
780 }
781 else
782 {
783 /* Single complex argument, nothing returned */
784
785 WalkState->ArgCount = 1;
786 }
787 break;
788
789
790 case ARGP_DATAOBJ:
791 case ARGP_TERMARG:
792
793 /* Single complex argument, nothing returned */
794
795 WalkState->ArgCount = 1;
796 break;
797
798
799 case ARGP_DATAOBJLIST:
800 case ARGP_TERMLIST:
801 case ARGP_OBJLIST:
802
803 if (ParserState->Aml < ParserState->PkgEnd)
804 {
805 /* Non-empty list of variable arguments, nothing returned */
806
807 WalkState->ArgCount = ACPI_VAR_ARGS;
808 }
809 break;
810
811
812 default:
813
814 ACPI_ERROR ((AE_INFO, "Invalid ArgType: 0x%X", ArgType));
815 Status = AE_AML_OPERAND_TYPE;
816 break;
817 }
818
819 *ReturnArg = Arg;
820 return_ACPI_STATUS (Status);
821 }