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
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, Start);
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 UINT8 *Aml;
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 Aml = ParserState->Aml;
544
545 /* Determine field type */
546
547 switch (ACPI_GET8 (ParserState->Aml))
548 {
549 case AML_FIELD_OFFSET_OP:
550
551 Opcode = AML_INT_RESERVEDFIELD_OP;
552 ParserState->Aml++;
553 break;
554
555 case AML_FIELD_ACCESS_OP:
556
557 Opcode = AML_INT_ACCESSFIELD_OP;
558 ParserState->Aml++;
559 break;
560
561 case AML_FIELD_CONNECTION_OP:
562
563 Opcode = AML_INT_CONNECTION_OP;
564 ParserState->Aml++;
565 break;
566
567 case AML_FIELD_EXT_ACCESS_OP:
568
569 Opcode = AML_INT_EXTACCESSFIELD_OP;
570 ParserState->Aml++;
571 break;
572
573 default:
574
575 Opcode = AML_INT_NAMEDFIELD_OP;
576 break;
577 }
578
579 /* Allocate a new field op */
580
581 Field = AcpiPsAllocOp (Opcode, Aml);
582 if (!Field)
583 {
584 return_PTR (NULL);
585 }
586
587 /* Decode the field type */
588
589 switch (Opcode)
590 {
591 case AML_INT_NAMEDFIELD_OP:
592
593 /* Get the 4-character name */
594
595 ACPI_MOVE_32_TO_32 (&Name, ParserState->Aml);
596 AcpiPsSetName (Field, Name);
597 ParserState->Aml += ACPI_NAME_SIZE;
598
599 /* Get the length which is encoded as a package length */
600
601 Field->Common.Value.Size = AcpiPsGetNextPackageLength (ParserState);
602 break;
603
604
605 case AML_INT_RESERVEDFIELD_OP:
606
607 /* Get the length which is encoded as a package length */
608
609 Field->Common.Value.Size = AcpiPsGetNextPackageLength (ParserState);
610 break;
611
612
613 case AML_INT_ACCESSFIELD_OP:
614 case AML_INT_EXTACCESSFIELD_OP:
615
616 /*
617 * Get AccessType and AccessAttrib and merge into the field Op
618 * AccessType is first operand, AccessAttribute is second. stuff
619 * these bytes into the node integer value for convenience.
620 */
621
622 /* Get the two bytes (Type/Attribute) */
623
624 AccessType = ACPI_GET8 (ParserState->Aml);
625 ParserState->Aml++;
626 AccessAttribute = ACPI_GET8 (ParserState->Aml);
627 ParserState->Aml++;
628
629 Field->Common.Value.Integer = (UINT8) AccessType;
630 Field->Common.Value.Integer |= (UINT16) (AccessAttribute << 8);
631
632 /* This opcode has a third byte, AccessLength */
633
634 if (Opcode == AML_INT_EXTACCESSFIELD_OP)
635 {
636 AccessLength = ACPI_GET8 (ParserState->Aml);
637 ParserState->Aml++;
638
639 Field->Common.Value.Integer |= (UINT32) (AccessLength << 16);
640 }
641 break;
642
643
644 case AML_INT_CONNECTION_OP:
645
646 /*
647 * Argument for Connection operator can be either a Buffer
648 * (resource descriptor), or a NameString.
649 */
650 Aml = ParserState->Aml;
651 if (ACPI_GET8 (ParserState->Aml) == AML_BUFFER_OP)
652 {
653 ParserState->Aml++;
654
655 PkgEnd = ParserState->Aml;
656 PkgLength = AcpiPsGetNextPackageLength (ParserState);
657 PkgEnd += PkgLength;
658
659 if (ParserState->Aml < PkgEnd)
660 {
661 /* Non-empty list */
662
663 Arg = AcpiPsAllocOp (AML_INT_BYTELIST_OP, Aml);
664 if (!Arg)
665 {
666 AcpiPsFreeOp (Field);
667 return_PTR (NULL);
668 }
669
670 /* Get the actual buffer length argument */
671
672 Opcode = ACPI_GET8 (ParserState->Aml);
673 ParserState->Aml++;
674
675 switch (Opcode)
676 {
677 case AML_BYTE_OP: /* AML_BYTEDATA_ARG */
678
679 BufferLength = ACPI_GET8 (ParserState->Aml);
680 ParserState->Aml += 1;
681 break;
682
683 case AML_WORD_OP: /* AML_WORDDATA_ARG */
684
685 BufferLength = ACPI_GET16 (ParserState->Aml);
686 ParserState->Aml += 2;
687 break;
688
689 case AML_DWORD_OP: /* AML_DWORDATA_ARG */
690
691 BufferLength = ACPI_GET32 (ParserState->Aml);
692 ParserState->Aml += 4;
693 break;
694
695 default:
696
697 BufferLength = 0;
698 break;
699 }
700
701 /* Fill in bytelist data */
702
703 Arg->Named.Value.Size = BufferLength;
704 Arg->Named.Data = ParserState->Aml;
705 }
706
707 /* Skip to End of byte data */
708
709 ParserState->Aml = PkgEnd;
710 }
711 else
712 {
713 Arg = AcpiPsAllocOp (AML_INT_NAMEPATH_OP, Aml);
714 if (!Arg)
715 {
716 AcpiPsFreeOp (Field);
717 return_PTR (NULL);
718 }
719
720 /* Get the Namestring argument */
721
722 Arg->Common.Value.Name = AcpiPsGetNextNamestring (ParserState);
723 }
724
725 /* Link the buffer/namestring to parent (CONNECTION_OP) */
726
727 AcpiPsAppendArg (Field, Arg);
728 break;
729
730
731 default:
732
733 /* Opcode was set in previous switch */
734 break;
735 }
736
737 return_PTR (Field);
738 }
739
740
741 /*******************************************************************************
742 *
743 * FUNCTION: AcpiPsGetNextArg
744 *
745 * PARAMETERS: WalkState - Current state
746 * ParserState - Current parser state object
747 * ArgType - The argument type (AML_*_ARG)
748 * ReturnArg - Where the next arg is returned
749 *
750 * RETURN: Status, and an op object containing the next argument.
751 *
752 * DESCRIPTION: Get next argument (including complex list arguments that require
753 * pushing the parser stack)
754 *
755 ******************************************************************************/
756
757 ACPI_STATUS
AcpiPsGetNextArg(ACPI_WALK_STATE * WalkState,ACPI_PARSE_STATE * ParserState,UINT32 ArgType,ACPI_PARSE_OBJECT ** ReturnArg)758 AcpiPsGetNextArg (
759 ACPI_WALK_STATE *WalkState,
760 ACPI_PARSE_STATE *ParserState,
761 UINT32 ArgType,
762 ACPI_PARSE_OBJECT **ReturnArg)
763 {
764 ACPI_PARSE_OBJECT *Arg = NULL;
765 ACPI_PARSE_OBJECT *Prev = NULL;
766 ACPI_PARSE_OBJECT *Field;
767 UINT32 Subop;
768 ACPI_STATUS Status = AE_OK;
769
770
771 ACPI_FUNCTION_TRACE_PTR (PsGetNextArg, ParserState);
772
773
774 switch (ArgType)
775 {
776 case ARGP_BYTEDATA:
777 case ARGP_WORDDATA:
778 case ARGP_DWORDDATA:
779 case ARGP_CHARLIST:
780 case ARGP_NAME:
781 case ARGP_NAMESTRING:
782
783 /* Constants, strings, and namestrings are all the same size */
784
785 Arg = AcpiPsAllocOp (AML_BYTE_OP, ParserState->Aml);
786 if (!Arg)
787 {
788 return_ACPI_STATUS (AE_NO_MEMORY);
789 }
790
791 AcpiPsGetNextSimpleArg (ParserState, ArgType, Arg);
792 break;
793
794 case ARGP_PKGLENGTH:
795
796 /* Package length, nothing returned */
797
798 ParserState->PkgEnd = AcpiPsGetNextPackageEnd (ParserState);
799 break;
800
801 case ARGP_FIELDLIST:
802
803 if (ParserState->Aml < ParserState->PkgEnd)
804 {
805 /* Non-empty list */
806
807 while (ParserState->Aml < ParserState->PkgEnd)
808 {
809 Field = AcpiPsGetNextField (ParserState);
810 if (!Field)
811 {
812 return_ACPI_STATUS (AE_NO_MEMORY);
813 }
814
815 if (Prev)
816 {
817 Prev->Common.Next = Field;
818 }
819 else
820 {
821 Arg = Field;
822 }
823 Prev = Field;
824 }
825
826 /* Skip to End of byte data */
827
828 ParserState->Aml = ParserState->PkgEnd;
829 }
830 break;
831
832 case ARGP_BYTELIST:
833
834 if (ParserState->Aml < ParserState->PkgEnd)
835 {
836 /* Non-empty list */
837
838 Arg = AcpiPsAllocOp (AML_INT_BYTELIST_OP,
839 ParserState->Aml);
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 case ARGP_NAME_OR_REF:
861
862 Subop = AcpiPsPeekOpcode (ParserState);
863 if (Subop == 0 ||
864 AcpiPsIsLeadingChar (Subop) ||
865 ACPI_IS_ROOT_PREFIX (Subop) ||
866 ACPI_IS_PARENT_PREFIX (Subop))
867 {
868 /* NullName or NameString */
869
870 Arg = AcpiPsAllocOp (AML_INT_NAMEPATH_OP, ParserState->Aml);
871 if (!Arg)
872 {
873 return_ACPI_STATUS (AE_NO_MEMORY);
874 }
875
876 /* To support SuperName arg of Unload */
877
878 if (WalkState->Opcode == AML_UNLOAD_OP)
879 {
880 Status = AcpiPsGetNextNamepath (WalkState, ParserState,
881 Arg, ACPI_POSSIBLE_METHOD_CALL);
882
883 /*
884 * If the SuperName argument is a method call, we have
885 * already 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,
896 Arg, ACPI_NOT_METHOD_CALL);
897 }
898 }
899 else
900 {
901 /* Single complex argument, nothing returned */
902
903 WalkState->ArgCount = 1;
904 }
905 break;
906
907 case ARGP_DATAOBJ:
908 case ARGP_TERMARG:
909
910 /* Single complex argument, nothing returned */
911
912 WalkState->ArgCount = 1;
913 break;
914
915 case ARGP_DATAOBJLIST:
916 case ARGP_TERMLIST:
917 case ARGP_OBJLIST:
918
919 if (ParserState->Aml < ParserState->PkgEnd)
920 {
921 /* Non-empty list of variable arguments, nothing returned */
922
923 WalkState->ArgCount = ACPI_VAR_ARGS;
924 }
925 break;
926
927 default:
928
929 ACPI_ERROR ((AE_INFO, "Invalid ArgType: 0x%X", ArgType));
930 Status = AE_AML_OPERAND_TYPE;
931 break;
932 }
933
934 *ReturnArg = Arg;
935 return_ACPI_STATUS (Status);
936 }
937