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 #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
AcpiPsGetNextPackageLength(ACPI_PARSE_STATE * ParserState)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 *
AcpiPsGetNextPackageEnd(ACPI_PARSE_STATE * ParserState)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 *
AcpiPsGetNextNamestring(ACPI_PARSE_STATE * ParserState)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
AcpiPsGetNextNamepath(ACPI_WALK_STATE * WalkState,ACPI_PARSE_STATE * ParserState,ACPI_PARSE_OBJECT * Arg,BOOLEAN PossibleMethodCall)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 if (WalkState->Opcode == AML_UNLOAD_OP)
302 {
303 /*
304 * AcpiPsGetNextNamestring has increased the AML pointer,
305 * so we need to restore the saved AML pointer for method call.
306 */
307 WalkState->ParserState.Aml = Start;
308 WalkState->ArgCount = 1;
309 AcpiPsInitOp (Arg, AML_INT_METHODCALL_OP);
310 return_ACPI_STATUS (AE_OK);
311 }
312
313 /* This name is actually a control method invocation */
314
315 MethodDesc = AcpiNsGetAttachedObject (Node);
316 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
317 "Control Method - %p Desc %p Path=%p\n", Node, MethodDesc, Path));
318
319 NameOp = AcpiPsAllocOp (AML_INT_NAMEPATH_OP);
320 if (!NameOp)
321 {
322 return_ACPI_STATUS (AE_NO_MEMORY);
323 }
324
325 /* Change Arg into a METHOD CALL and attach name to it */
326
327 AcpiPsInitOp (Arg, AML_INT_METHODCALL_OP);
328 NameOp->Common.Value.Name = Path;
329
330 /* Point METHODCALL/NAME to the METHOD Node */
331
332 NameOp->Common.Node = Node;
333 AcpiPsAppendArg (Arg, NameOp);
334
335 if (!MethodDesc)
336 {
337 ACPI_ERROR ((AE_INFO,
338 "Control Method %p has no attached object",
339 Node));
340 return_ACPI_STATUS (AE_AML_INTERNAL);
341 }
342
343 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
344 "Control Method - %p Args %X\n",
345 Node, MethodDesc->Method.ParamCount));
346
347 /* Get the number of arguments to expect */
348
349 WalkState->ArgCount = MethodDesc->Method.ParamCount;
350 return_ACPI_STATUS (AE_OK);
351 }
352
353 /*
354 * Special handling if the name was not found during the lookup -
355 * some NotFound cases are allowed
356 */
357 if (Status == AE_NOT_FOUND)
358 {
359 /* 1) NotFound is ok during load pass 1/2 (allow forward references) */
360
361 if ((WalkState->ParseFlags & ACPI_PARSE_MODE_MASK) !=
362 ACPI_PARSE_EXECUTE)
363 {
364 Status = AE_OK;
365 }
366
367 /* 2) NotFound during a CondRefOf(x) is ok by definition */
368
369 else if (WalkState->Op->Common.AmlOpcode == AML_COND_REF_OF_OP)
370 {
371 Status = AE_OK;
372 }
373
374 /*
375 * 3) NotFound while building a Package is ok at this point, we
376 * may flag as an error later if slack mode is not enabled.
377 * (Some ASL code depends on allowing this behavior)
378 */
379 else if ((Arg->Common.Parent) &&
380 ((Arg->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
381 (Arg->Common.Parent->Common.AmlOpcode == AML_VAR_PACKAGE_OP)))
382 {
383 Status = AE_OK;
384 }
385 }
386
387 /* Final exception check (may have been changed from code above) */
388
389 if (ACPI_FAILURE (Status))
390 {
391 ACPI_ERROR_NAMESPACE (Path, Status);
392
393 if ((WalkState->ParseFlags & ACPI_PARSE_MODE_MASK) ==
394 ACPI_PARSE_EXECUTE)
395 {
396 /* Report a control method execution error */
397
398 Status = AcpiDsMethodError (Status, WalkState);
399 }
400 }
401
402 /* Save the namepath */
403
404 Arg->Common.Value.Name = Path;
405 return_ACPI_STATUS (Status);
406 }
407
408
409 /*******************************************************************************
410 *
411 * FUNCTION: AcpiPsGetNextSimpleArg
412 *
413 * PARAMETERS: ParserState - Current parser state object
414 * ArgType - The argument type (AML_*_ARG)
415 * Arg - Where the argument is returned
416 *
417 * RETURN: None
418 *
419 * DESCRIPTION: Get the next simple argument (constant, string, or namestring)
420 *
421 ******************************************************************************/
422
423 void
AcpiPsGetNextSimpleArg(ACPI_PARSE_STATE * ParserState,UINT32 ArgType,ACPI_PARSE_OBJECT * Arg)424 AcpiPsGetNextSimpleArg (
425 ACPI_PARSE_STATE *ParserState,
426 UINT32 ArgType,
427 ACPI_PARSE_OBJECT *Arg)
428 {
429 UINT32 Length;
430 UINT16 Opcode;
431 UINT8 *Aml = ParserState->Aml;
432
433
434 ACPI_FUNCTION_TRACE_U32 (PsGetNextSimpleArg, ArgType);
435
436
437 switch (ArgType)
438 {
439 case ARGP_BYTEDATA:
440
441 /* Get 1 byte from the AML stream */
442
443 Opcode = AML_BYTE_OP;
444 Arg->Common.Value.Integer = (UINT64) *Aml;
445 Length = 1;
446 break;
447
448 case ARGP_WORDDATA:
449
450 /* Get 2 bytes from the AML stream */
451
452 Opcode = AML_WORD_OP;
453 ACPI_MOVE_16_TO_64 (&Arg->Common.Value.Integer, Aml);
454 Length = 2;
455 break;
456
457 case ARGP_DWORDDATA:
458
459 /* Get 4 bytes from the AML stream */
460
461 Opcode = AML_DWORD_OP;
462 ACPI_MOVE_32_TO_64 (&Arg->Common.Value.Integer, Aml);
463 Length = 4;
464 break;
465
466 case ARGP_QWORDDATA:
467
468 /* Get 8 bytes from the AML stream */
469
470 Opcode = AML_QWORD_OP;
471 ACPI_MOVE_64_TO_64 (&Arg->Common.Value.Integer, Aml);
472 Length = 8;
473 break;
474
475 case ARGP_CHARLIST:
476
477 /* Get a pointer to the string, point past the string */
478
479 Opcode = AML_STRING_OP;
480 Arg->Common.Value.String = ACPI_CAST_PTR (char, Aml);
481
482 /* Find the null terminator */
483
484 Length = 0;
485 while (Aml[Length])
486 {
487 Length++;
488 }
489 Length++;
490 break;
491
492 case ARGP_NAME:
493 case ARGP_NAMESTRING:
494
495 AcpiPsInitOp (Arg, AML_INT_NAMEPATH_OP);
496 Arg->Common.Value.Name = AcpiPsGetNextNamestring (ParserState);
497 return_VOID;
498
499 default:
500
501 ACPI_ERROR ((AE_INFO, "Invalid ArgType 0x%X", ArgType));
502 return_VOID;
503 }
504
505 AcpiPsInitOp (Arg, Opcode);
506 ParserState->Aml += Length;
507 return_VOID;
508 }
509
510
511 /*******************************************************************************
512 *
513 * FUNCTION: AcpiPsGetNextField
514 *
515 * PARAMETERS: ParserState - Current parser state object
516 *
517 * RETURN: A newly allocated FIELD op
518 *
519 * DESCRIPTION: Get next field (NamedField, ReservedField, or AccessField)
520 *
521 ******************************************************************************/
522
523 static ACPI_PARSE_OBJECT *
AcpiPsGetNextField(ACPI_PARSE_STATE * ParserState)524 AcpiPsGetNextField (
525 ACPI_PARSE_STATE *ParserState)
526 {
527 UINT32 AmlOffset;
528 ACPI_PARSE_OBJECT *Field;
529 ACPI_PARSE_OBJECT *Arg = NULL;
530 UINT16 Opcode;
531 UINT32 Name;
532 UINT8 AccessType;
533 UINT8 AccessAttribute;
534 UINT8 AccessLength;
535 UINT32 PkgLength;
536 UINT8 *PkgEnd;
537 UINT32 BufferLength;
538
539
540 ACPI_FUNCTION_TRACE (PsGetNextField);
541
542
543 AmlOffset = (UINT32) ACPI_PTR_DIFF (
544 ParserState->Aml, ParserState->AmlStart);
545
546 /* Determine field type */
547
548 switch (ACPI_GET8 (ParserState->Aml))
549 {
550 case AML_FIELD_OFFSET_OP:
551
552 Opcode = AML_INT_RESERVEDFIELD_OP;
553 ParserState->Aml++;
554 break;
555
556 case AML_FIELD_ACCESS_OP:
557
558 Opcode = AML_INT_ACCESSFIELD_OP;
559 ParserState->Aml++;
560 break;
561
562 case AML_FIELD_CONNECTION_OP:
563
564 Opcode = AML_INT_CONNECTION_OP;
565 ParserState->Aml++;
566 break;
567
568 case AML_FIELD_EXT_ACCESS_OP:
569
570 Opcode = AML_INT_EXTACCESSFIELD_OP;
571 ParserState->Aml++;
572 break;
573
574 default:
575
576 Opcode = AML_INT_NAMEDFIELD_OP;
577 break;
578 }
579
580 /* Allocate a new field op */
581
582 Field = AcpiPsAllocOp (Opcode);
583 if (!Field)
584 {
585 return_PTR (NULL);
586 }
587
588 Field->Common.AmlOffset = AmlOffset;
589
590 /* Decode the field type */
591
592 switch (Opcode)
593 {
594 case AML_INT_NAMEDFIELD_OP:
595
596 /* Get the 4-character name */
597
598 ACPI_MOVE_32_TO_32 (&Name, ParserState->Aml);
599 AcpiPsSetName (Field, Name);
600 ParserState->Aml += ACPI_NAME_SIZE;
601
602 /* Get the length which is encoded as a package length */
603
604 Field->Common.Value.Size = AcpiPsGetNextPackageLength (ParserState);
605 break;
606
607
608 case AML_INT_RESERVEDFIELD_OP:
609
610 /* Get the length which is encoded as a package length */
611
612 Field->Common.Value.Size = AcpiPsGetNextPackageLength (ParserState);
613 break;
614
615
616 case AML_INT_ACCESSFIELD_OP:
617 case AML_INT_EXTACCESSFIELD_OP:
618
619 /*
620 * Get AccessType and AccessAttrib and merge into the field Op
621 * AccessType is first operand, AccessAttribute is second. stuff
622 * these bytes into the node integer value for convenience.
623 */
624
625 /* Get the two bytes (Type/Attribute) */
626
627 AccessType = ACPI_GET8 (ParserState->Aml);
628 ParserState->Aml++;
629 AccessAttribute = ACPI_GET8 (ParserState->Aml);
630 ParserState->Aml++;
631
632 Field->Common.Value.Integer = (UINT8) AccessType;
633 Field->Common.Value.Integer |= (UINT16) (AccessAttribute << 8);
634
635 /* This opcode has a third byte, AccessLength */
636
637 if (Opcode == AML_INT_EXTACCESSFIELD_OP)
638 {
639 AccessLength = ACPI_GET8 (ParserState->Aml);
640 ParserState->Aml++;
641
642 Field->Common.Value.Integer |= (UINT32) (AccessLength << 16);
643 }
644 break;
645
646
647 case AML_INT_CONNECTION_OP:
648
649 /*
650 * Argument for Connection operator can be either a Buffer
651 * (resource descriptor), or a NameString.
652 */
653 if (ACPI_GET8 (ParserState->Aml) == AML_BUFFER_OP)
654 {
655 ParserState->Aml++;
656
657 PkgEnd = ParserState->Aml;
658 PkgLength = AcpiPsGetNextPackageLength (ParserState);
659 PkgEnd += PkgLength;
660
661 if (ParserState->Aml < PkgEnd)
662 {
663 /* Non-empty list */
664
665 Arg = AcpiPsAllocOp (AML_INT_BYTELIST_OP);
666 if (!Arg)
667 {
668 AcpiPsFreeOp (Field);
669 return_PTR (NULL);
670 }
671
672 /* Get the actual buffer length argument */
673
674 Opcode = ACPI_GET8 (ParserState->Aml);
675 ParserState->Aml++;
676
677 switch (Opcode)
678 {
679 case AML_BYTE_OP: /* AML_BYTEDATA_ARG */
680
681 BufferLength = ACPI_GET8 (ParserState->Aml);
682 ParserState->Aml += 1;
683 break;
684
685 case AML_WORD_OP: /* AML_WORDDATA_ARG */
686
687 BufferLength = ACPI_GET16 (ParserState->Aml);
688 ParserState->Aml += 2;
689 break;
690
691 case AML_DWORD_OP: /* AML_DWORDATA_ARG */
692
693 BufferLength = ACPI_GET32 (ParserState->Aml);
694 ParserState->Aml += 4;
695 break;
696
697 default:
698
699 BufferLength = 0;
700 break;
701 }
702
703 /* Fill in bytelist data */
704
705 Arg->Named.Value.Size = BufferLength;
706 Arg->Named.Data = ParserState->Aml;
707 }
708
709 /* Skip to End of byte data */
710
711 ParserState->Aml = PkgEnd;
712 }
713 else
714 {
715 Arg = AcpiPsAllocOp (AML_INT_NAMEPATH_OP);
716 if (!Arg)
717 {
718 AcpiPsFreeOp (Field);
719 return_PTR (NULL);
720 }
721
722 /* Get the Namestring argument */
723
724 Arg->Common.Value.Name = AcpiPsGetNextNamestring (ParserState);
725 }
726
727 /* Link the buffer/namestring to parent (CONNECTION_OP) */
728
729 AcpiPsAppendArg (Field, Arg);
730 break;
731
732
733 default:
734
735 /* Opcode was set in previous switch */
736 break;
737 }
738
739 return_PTR (Field);
740 }
741
742
743 /*******************************************************************************
744 *
745 * FUNCTION: AcpiPsGetNextArg
746 *
747 * PARAMETERS: WalkState - Current state
748 * ParserState - Current parser state object
749 * ArgType - The argument type (AML_*_ARG)
750 * ReturnArg - Where the next arg is returned
751 *
752 * RETURN: Status, and an op object containing the next argument.
753 *
754 * DESCRIPTION: Get next argument (including complex list arguments that require
755 * pushing the parser stack)
756 *
757 ******************************************************************************/
758
759 ACPI_STATUS
AcpiPsGetNextArg(ACPI_WALK_STATE * WalkState,ACPI_PARSE_STATE * ParserState,UINT32 ArgType,ACPI_PARSE_OBJECT ** ReturnArg)760 AcpiPsGetNextArg (
761 ACPI_WALK_STATE *WalkState,
762 ACPI_PARSE_STATE *ParserState,
763 UINT32 ArgType,
764 ACPI_PARSE_OBJECT **ReturnArg)
765 {
766 ACPI_PARSE_OBJECT *Arg = NULL;
767 ACPI_PARSE_OBJECT *Prev = NULL;
768 ACPI_PARSE_OBJECT *Field;
769 UINT32 Subop;
770 ACPI_STATUS Status = AE_OK;
771
772
773 ACPI_FUNCTION_TRACE_PTR (PsGetNextArg, ParserState);
774
775
776 switch (ArgType)
777 {
778 case ARGP_BYTEDATA:
779 case ARGP_WORDDATA:
780 case ARGP_DWORDDATA:
781 case ARGP_CHARLIST:
782 case ARGP_NAME:
783 case ARGP_NAMESTRING:
784
785 /* Constants, strings, and namestrings are all the same size */
786
787 Arg = AcpiPsAllocOp (AML_BYTE_OP);
788 if (!Arg)
789 {
790 return_ACPI_STATUS (AE_NO_MEMORY);
791 }
792 AcpiPsGetNextSimpleArg (ParserState, ArgType, Arg);
793 break;
794
795 case ARGP_PKGLENGTH:
796
797 /* Package length, nothing returned */
798
799 ParserState->PkgEnd = AcpiPsGetNextPackageEnd (ParserState);
800 break;
801
802 case ARGP_FIELDLIST:
803
804 if (ParserState->Aml < ParserState->PkgEnd)
805 {
806 /* Non-empty list */
807
808 while (ParserState->Aml < ParserState->PkgEnd)
809 {
810 Field = AcpiPsGetNextField (ParserState);
811 if (!Field)
812 {
813 return_ACPI_STATUS (AE_NO_MEMORY);
814 }
815
816 if (Prev)
817 {
818 Prev->Common.Next = Field;
819 }
820 else
821 {
822 Arg = Field;
823 }
824 Prev = Field;
825 }
826
827 /* Skip to End of byte data */
828
829 ParserState->Aml = ParserState->PkgEnd;
830 }
831 break;
832
833 case ARGP_BYTELIST:
834
835 if (ParserState->Aml < ParserState->PkgEnd)
836 {
837 /* Non-empty list */
838
839 Arg = AcpiPsAllocOp (AML_INT_BYTELIST_OP);
840 if (!Arg)
841 {
842 return_ACPI_STATUS (AE_NO_MEMORY);
843 }
844
845 /* Fill in bytelist data */
846
847 Arg->Common.Value.Size = (UINT32)
848 ACPI_PTR_DIFF (ParserState->PkgEnd, ParserState->Aml);
849 Arg->Named.Data = ParserState->Aml;
850
851 /* Skip to End of byte data */
852
853 ParserState->Aml = ParserState->PkgEnd;
854 }
855 break;
856
857 case ARGP_TARGET:
858 case ARGP_SUPERNAME:
859 case ARGP_SIMPLENAME:
860
861 Subop = AcpiPsPeekOpcode (ParserState);
862 if (Subop == 0 ||
863 AcpiPsIsLeadingChar (Subop) ||
864 ACPI_IS_ROOT_PREFIX (Subop) ||
865 ACPI_IS_PARENT_PREFIX (Subop))
866 {
867 /* NullName or NameString */
868
869 Arg = AcpiPsAllocOp (AML_INT_NAMEPATH_OP);
870 if (!Arg)
871 {
872 return_ACPI_STATUS (AE_NO_MEMORY);
873 }
874
875 /* To support SuperName arg of Unload */
876
877 if (WalkState->Opcode == AML_UNLOAD_OP)
878 {
879 Status = AcpiPsGetNextNamepath (WalkState, ParserState, Arg, 1);
880
881 /*
882 * If the SuperName arg of Unload is a method call,
883 * we have restored the AML pointer, just free this Arg
884 */
885 if (Arg->Common.AmlOpcode == AML_INT_METHODCALL_OP)
886 {
887 AcpiPsFreeOp (Arg);
888 Arg = NULL;
889 }
890 }
891 else
892 {
893 Status = AcpiPsGetNextNamepath (WalkState, ParserState, Arg, 0);
894 }
895 }
896 else
897 {
898 /* Single complex argument, nothing returned */
899
900 WalkState->ArgCount = 1;
901 }
902 break;
903
904 case ARGP_DATAOBJ:
905 case ARGP_TERMARG:
906
907 /* Single complex argument, nothing returned */
908
909 WalkState->ArgCount = 1;
910 break;
911
912 case ARGP_DATAOBJLIST:
913 case ARGP_TERMLIST:
914 case ARGP_OBJLIST:
915
916 if (ParserState->Aml < ParserState->PkgEnd)
917 {
918 /* Non-empty list of variable arguments, nothing returned */
919
920 WalkState->ArgCount = ACPI_VAR_ARGS;
921 }
922 break;
923
924 default:
925
926 ACPI_ERROR ((AE_INFO, "Invalid ArgType: 0x%X", ArgType));
927 Status = AE_AML_OPERAND_TYPE;
928 break;
929 }
930
931 *ReturnArg = Arg;
932 return_ACPI_STATUS (Status);
933 }
934