1 | /****************************************************************************** |
2 | * |
3 | * Module Name: psargs - Parse AML opcode arguments |
4 | * |
5 | *****************************************************************************/ |
6 | |
7 | /* |
8 | * Copyright (C) 2000 - 2016, Intel Corp. |
9 | * All rights reserved. |
10 | * |
11 | * Redistribution and use in source and binary forms, with or without |
12 | * modification, are permitted provided that the following conditions |
13 | * are met: |
14 | * 1. Redistributions of source code must retain the above copyright |
15 | * notice, this list of conditions, and the following disclaimer, |
16 | * without modification. |
17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer |
18 | * substantially similar to the "NO WARRANTY" disclaimer below |
19 | * ("Disclaimer") and any redistribution must be conditioned upon |
20 | * including a substantially similar Disclaimer requirement for further |
21 | * binary redistribution. |
22 | * 3. Neither the names of the above-listed copyright holders nor the names |
23 | * of any contributors may be used to endorse or promote products derived |
24 | * from this software without specific prior written permission. |
25 | * |
26 | * Alternatively, this software may be distributed under the terms of the |
27 | * GNU General Public License ("GPL") version 2 as published by the Free |
28 | * Software Foundation. |
29 | * |
30 | * NO WARRANTY |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
41 | * POSSIBILITY OF SUCH DAMAGES. |
42 | */ |
43 | |
44 | #include "acpi.h" |
45 | #include "accommon.h" |
46 | #include "acparser.h" |
47 | #include "amlcode.h" |
48 | #include "acnamesp.h" |
49 | #include "acdispat.h" |
50 | |
51 | #define _COMPONENT ACPI_PARSER |
52 | ACPI_MODULE_NAME ("psargs" ) |
53 | |
54 | /* Local prototypes */ |
55 | |
56 | static UINT32 |
57 | AcpiPsGetNextPackageLength ( |
58 | ACPI_PARSE_STATE *ParserState); |
59 | |
60 | static ACPI_PARSE_OBJECT * |
61 | AcpiPsGetNextField ( |
62 | ACPI_PARSE_STATE *ParserState); |
63 | |
64 | |
65 | /******************************************************************************* |
66 | * |
67 | * FUNCTION: AcpiPsGetNextPackageLength |
68 | * |
69 | * PARAMETERS: ParserState - Current parser state object |
70 | * |
71 | * RETURN: Decoded package length. On completion, the AML pointer points |
72 | * past the length byte or bytes. |
73 | * |
74 | * DESCRIPTION: Decode and return a package length field. |
75 | * Note: Largest package length is 28 bits, from ACPI specification |
76 | * |
77 | ******************************************************************************/ |
78 | |
79 | static UINT32 |
80 | AcpiPsGetNextPackageLength ( |
81 | ACPI_PARSE_STATE *ParserState) |
82 | { |
83 | UINT8 *Aml = ParserState->Aml; |
84 | UINT32 PackageLength = 0; |
85 | UINT32 ByteCount; |
86 | UINT8 ByteZeroMask = 0x3F; /* Default [0:5] */ |
87 | |
88 | |
89 | ACPI_FUNCTION_TRACE (PsGetNextPackageLength); |
90 | |
91 | |
92 | /* |
93 | * Byte 0 bits [6:7] contain the number of additional bytes |
94 | * used to encode the package length, either 0,1,2, or 3 |
95 | */ |
96 | ByteCount = (Aml[0] >> 6); |
97 | ParserState->Aml += ((ACPI_SIZE) ByteCount + 1); |
98 | |
99 | /* Get bytes 3, 2, 1 as needed */ |
100 | |
101 | while (ByteCount) |
102 | { |
103 | /* |
104 | * Final bit positions for the package length bytes: |
105 | * Byte3->[20:27] |
106 | * Byte2->[12:19] |
107 | * Byte1->[04:11] |
108 | * Byte0->[00:03] |
109 | */ |
110 | PackageLength |= (Aml[ByteCount] << ((ByteCount << 3) - 4)); |
111 | |
112 | ByteZeroMask = 0x0F; /* Use bits [0:3] of byte 0 */ |
113 | ByteCount--; |
114 | } |
115 | |
116 | /* Byte 0 is a special case, either bits [0:3] or [0:5] are used */ |
117 | |
118 | PackageLength |= (Aml[0] & ByteZeroMask); |
119 | return_UINT32 (PackageLength); |
120 | } |
121 | |
122 | |
123 | /******************************************************************************* |
124 | * |
125 | * FUNCTION: AcpiPsGetNextPackageEnd |
126 | * |
127 | * PARAMETERS: ParserState - Current parser state object |
128 | * |
129 | * RETURN: Pointer to end-of-package +1 |
130 | * |
131 | * DESCRIPTION: Get next package length and return a pointer past the end of |
132 | * the package. Consumes the package length field |
133 | * |
134 | ******************************************************************************/ |
135 | |
136 | UINT8 * |
137 | AcpiPsGetNextPackageEnd ( |
138 | ACPI_PARSE_STATE *ParserState) |
139 | { |
140 | UINT8 *Start = ParserState->Aml; |
141 | UINT32 PackageLength; |
142 | |
143 | |
144 | ACPI_FUNCTION_TRACE (PsGetNextPackageEnd); |
145 | |
146 | |
147 | /* Function below updates ParserState->Aml */ |
148 | |
149 | PackageLength = AcpiPsGetNextPackageLength (ParserState); |
150 | |
151 | return_PTR (Start + PackageLength); /* end of package */ |
152 | } |
153 | |
154 | |
155 | /******************************************************************************* |
156 | * |
157 | * FUNCTION: AcpiPsGetNextNamestring |
158 | * |
159 | * PARAMETERS: ParserState - Current parser state object |
160 | * |
161 | * RETURN: Pointer to the start of the name string (pointer points into |
162 | * the AML. |
163 | * |
164 | * DESCRIPTION: Get next raw namestring within the AML stream. Handles all name |
165 | * prefix characters. Set parser state to point past the string. |
166 | * (Name is consumed from the AML.) |
167 | * |
168 | ******************************************************************************/ |
169 | |
170 | char * |
171 | AcpiPsGetNextNamestring ( |
172 | ACPI_PARSE_STATE *ParserState) |
173 | { |
174 | UINT8 *Start = ParserState->Aml; |
175 | UINT8 *End = ParserState->Aml; |
176 | |
177 | |
178 | ACPI_FUNCTION_TRACE (PsGetNextNamestring); |
179 | |
180 | |
181 | /* Point past any namestring prefix characters (backslash or carat) */ |
182 | |
183 | while (ACPI_IS_ROOT_PREFIX (*End) || |
184 | ACPI_IS_PARENT_PREFIX (*End)) |
185 | { |
186 | End++; |
187 | } |
188 | |
189 | /* Decode the path prefix character */ |
190 | |
191 | switch (*End) |
192 | { |
193 | case 0: |
194 | |
195 | /* NullName */ |
196 | |
197 | if (End == Start) |
198 | { |
199 | Start = NULL; |
200 | } |
201 | End++; |
202 | break; |
203 | |
204 | case AML_DUAL_NAME_PREFIX: |
205 | |
206 | /* Two name segments */ |
207 | |
208 | End += 1 + (2 * ACPI_NAME_SIZE); |
209 | break; |
210 | |
211 | case AML_MULTI_NAME_PREFIX_OP: |
212 | |
213 | /* Multiple name segments, 4 chars each, count in next byte */ |
214 | |
215 | End += 2 + (*(End + 1) * ACPI_NAME_SIZE); |
216 | break; |
217 | |
218 | default: |
219 | |
220 | /* Single name segment */ |
221 | |
222 | End += ACPI_NAME_SIZE; |
223 | break; |
224 | } |
225 | |
226 | ParserState->Aml = End; |
227 | return_PTR ((char *) Start); |
228 | } |
229 | |
230 | |
231 | /******************************************************************************* |
232 | * |
233 | * FUNCTION: AcpiPsGetNextNamepath |
234 | * |
235 | * PARAMETERS: ParserState - Current parser state object |
236 | * Arg - Where the namepath will be stored |
237 | * ArgCount - If the namepath points to a control method |
238 | * the method's argument is returned here. |
239 | * PossibleMethodCall - Whether the namepath can possibly be the |
240 | * start of a method call |
241 | * |
242 | * RETURN: Status |
243 | * |
244 | * DESCRIPTION: Get next name (if method call, return # of required args). |
245 | * Names are looked up in the internal namespace to determine |
246 | * if the name represents a control method. If a method |
247 | * is found, the number of arguments to the method is returned. |
248 | * This information is critical for parsing to continue correctly. |
249 | * |
250 | ******************************************************************************/ |
251 | |
252 | ACPI_STATUS |
253 | AcpiPsGetNextNamepath ( |
254 | ACPI_WALK_STATE *WalkState, |
255 | ACPI_PARSE_STATE *ParserState, |
256 | ACPI_PARSE_OBJECT *Arg, |
257 | BOOLEAN PossibleMethodCall) |
258 | { |
259 | ACPI_STATUS Status; |
260 | char *Path; |
261 | ACPI_PARSE_OBJECT *NameOp; |
262 | ACPI_OPERAND_OBJECT *MethodDesc; |
263 | ACPI_NAMESPACE_NODE *Node; |
264 | UINT8 *Start = ParserState->Aml; |
265 | |
266 | |
267 | ACPI_FUNCTION_TRACE (PsGetNextNamepath); |
268 | |
269 | |
270 | Path = AcpiPsGetNextNamestring (ParserState); |
271 | AcpiPsInitOp (Arg, AML_INT_NAMEPATH_OP); |
272 | |
273 | /* Null path case is allowed, just exit */ |
274 | |
275 | if (!Path) |
276 | { |
277 | Arg->Common.Value.Name = Path; |
278 | return_ACPI_STATUS (AE_OK); |
279 | } |
280 | |
281 | /* |
282 | * Lookup the name in the internal namespace, starting with the current |
283 | * scope. We don't want to add anything new to the namespace here, |
284 | * however, so we use MODE_EXECUTE. |
285 | * Allow searching of the parent tree, but don't open a new scope - |
286 | * we just want to lookup the object (must be mode EXECUTE to perform |
287 | * the upsearch) |
288 | */ |
289 | Status = AcpiNsLookup (WalkState->ScopeInfo, Path, |
290 | ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE, |
291 | ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, NULL, &Node); |
292 | |
293 | /* |
294 | * If this name is a control method invocation, we must |
295 | * setup the method call |
296 | */ |
297 | if (ACPI_SUCCESS (Status) && |
298 | PossibleMethodCall && |
299 | (Node->Type == ACPI_TYPE_METHOD)) |
300 | { |
301 | 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 |
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 * |
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 |
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 | |