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[deliverable/linux.git] / drivers / acpi / parser / psloop.c
1 /******************************************************************************
2 *
3 * Module Name: psloop - Main AML parse loop
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2006, R. Byron Moore
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 /*
45 * Parse the AML and build an operation tree as most interpreters,
46 * like Perl, do. Parsing is done by hand rather than with a YACC
47 * generated parser to tightly constrain stack and dynamic memory
48 * usage. At the same time, parsing is kept flexible and the code
49 * fairly compact by parsing based on a list of AML opcode
50 * templates in aml_op_info[]
51 */
52
53 #include <acpi/acpi.h>
54 #include <acpi/acparser.h>
55 #include <acpi/acdispat.h>
56 #include <acpi/amlcode.h>
57
58 #define _COMPONENT ACPI_PARSER
59 ACPI_MODULE_NAME("psloop")
60
61 static u32 acpi_gbl_depth = 0;
62
63 /*******************************************************************************
64 *
65 * FUNCTION: acpi_ps_parse_loop
66 *
67 * PARAMETERS: walk_state - Current state
68 *
69 * RETURN: Status
70 *
71 * DESCRIPTION: Parse AML (pointed to by the current parser state) and return
72 * a tree of ops.
73 *
74 ******************************************************************************/
75
76 acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state)
77 {
78 acpi_status status = AE_OK;
79 acpi_status status2;
80 union acpi_parse_object *op = NULL; /* current op */
81 union acpi_parse_object *arg = NULL;
82 union acpi_parse_object *pre_op = NULL;
83 struct acpi_parse_state *parser_state;
84 u8 *aml_op_start = NULL;
85
86 ACPI_FUNCTION_TRACE_PTR(ps_parse_loop, walk_state);
87
88 if (walk_state->descending_callback == NULL) {
89 return_ACPI_STATUS(AE_BAD_PARAMETER);
90 }
91
92 parser_state = &walk_state->parser_state;
93 walk_state->arg_types = 0;
94
95 #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
96
97 if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) {
98
99 /* We are restarting a preempted control method */
100
101 if (acpi_ps_has_completed_scope(parser_state)) {
102 /*
103 * We must check if a predicate to an IF or WHILE statement
104 * was just completed
105 */
106 if ((parser_state->scope->parse_scope.op) &&
107 ((parser_state->scope->parse_scope.op->common.
108 aml_opcode == AML_IF_OP)
109 || (parser_state->scope->parse_scope.op->common.
110 aml_opcode == AML_WHILE_OP))
111 && (walk_state->control_state)
112 && (walk_state->control_state->common.state ==
113 ACPI_CONTROL_PREDICATE_EXECUTING)) {
114 /*
115 * A predicate was just completed, get the value of the
116 * predicate and branch based on that value
117 */
118 walk_state->op = NULL;
119 status =
120 acpi_ds_get_predicate_value(walk_state,
121 ACPI_TO_POINTER
122 (TRUE));
123 if (ACPI_FAILURE(status)
124 && ((status & AE_CODE_MASK) !=
125 AE_CODE_CONTROL)) {
126 if (status == AE_AML_NO_RETURN_VALUE) {
127 ACPI_EXCEPTION((AE_INFO, status,
128 "Invoked method did not return a value"));
129
130 }
131 ACPI_EXCEPTION((AE_INFO, status,
132 "GetPredicate Failed"));
133 return_ACPI_STATUS(status);
134 }
135
136 status =
137 acpi_ps_next_parse_state(walk_state, op,
138 status);
139 }
140
141 acpi_ps_pop_scope(parser_state, &op,
142 &walk_state->arg_types,
143 &walk_state->arg_count);
144 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
145 "Popped scope, Op=%p\n", op));
146 } else if (walk_state->prev_op) {
147
148 /* We were in the middle of an op */
149
150 op = walk_state->prev_op;
151 walk_state->arg_types = walk_state->prev_arg_types;
152 }
153 }
154 #endif
155
156 /* Iterative parsing loop, while there is more AML to process: */
157
158 while ((parser_state->aml < parser_state->aml_end) || (op)) {
159 aml_op_start = parser_state->aml;
160 if (!op) {
161
162 /* Get the next opcode from the AML stream */
163
164 walk_state->aml_offset =
165 (u32) ACPI_PTR_DIFF(parser_state->aml,
166 parser_state->aml_start);
167 walk_state->opcode = acpi_ps_peek_opcode(parser_state);
168
169 /*
170 * First cut to determine what we have found:
171 * 1) A valid AML opcode
172 * 2) A name string
173 * 3) An unknown/invalid opcode
174 */
175 walk_state->op_info =
176 acpi_ps_get_opcode_info(walk_state->opcode);
177 switch (walk_state->op_info->class) {
178 case AML_CLASS_ASCII:
179 case AML_CLASS_PREFIX:
180 /*
181 * Starts with a valid prefix or ASCII char, this is a name
182 * string. Convert the bare name string to a namepath.
183 */
184 walk_state->opcode = AML_INT_NAMEPATH_OP;
185 walk_state->arg_types = ARGP_NAMESTRING;
186 break;
187
188 case AML_CLASS_UNKNOWN:
189
190 /* The opcode is unrecognized. Just skip unknown opcodes */
191
192 ACPI_ERROR((AE_INFO,
193 "Found unknown opcode %X at AML address %p offset %X, ignoring",
194 walk_state->opcode,
195 parser_state->aml,
196 walk_state->aml_offset));
197
198 ACPI_DUMP_BUFFER(parser_state->aml, 128);
199
200 /* Assume one-byte bad opcode */
201
202 parser_state->aml++;
203 continue;
204
205 default:
206
207 /* Found opcode info, this is a normal opcode */
208
209 parser_state->aml +=
210 acpi_ps_get_opcode_size(walk_state->opcode);
211 walk_state->arg_types =
212 walk_state->op_info->parse_args;
213 break;
214 }
215
216 /* Create Op structure and append to parent's argument list */
217
218 if (walk_state->op_info->flags & AML_NAMED) {
219
220 /* Allocate a new pre_op if necessary */
221
222 if (!pre_op) {
223 pre_op =
224 acpi_ps_alloc_op(walk_state->
225 opcode);
226 if (!pre_op) {
227 status = AE_NO_MEMORY;
228 goto close_this_op;
229 }
230 }
231
232 pre_op->common.value.arg = NULL;
233 pre_op->common.aml_opcode = walk_state->opcode;
234
235 /*
236 * Get and append arguments until we find the node that contains
237 * the name (the type ARGP_NAME).
238 */
239 while (GET_CURRENT_ARG_TYPE
240 (walk_state->arg_types)
241 &&
242 (GET_CURRENT_ARG_TYPE
243 (walk_state->arg_types) != ARGP_NAME)) {
244 status =
245 acpi_ps_get_next_arg(walk_state,
246 parser_state,
247 GET_CURRENT_ARG_TYPE
248 (walk_state->
249 arg_types),
250 &arg);
251 if (ACPI_FAILURE(status)) {
252 goto close_this_op;
253 }
254
255 acpi_ps_append_arg(pre_op, arg);
256 INCREMENT_ARG_LIST(walk_state->
257 arg_types);
258 }
259
260 /*
261 * Make sure that we found a NAME and didn't run out of
262 * arguments
263 */
264 if (!GET_CURRENT_ARG_TYPE
265 (walk_state->arg_types)) {
266 status = AE_AML_NO_OPERAND;
267 goto close_this_op;
268 }
269
270 /* We know that this arg is a name, move to next arg */
271
272 INCREMENT_ARG_LIST(walk_state->arg_types);
273
274 /*
275 * Find the object. This will either insert the object into
276 * the namespace or simply look it up
277 */
278 walk_state->op = NULL;
279
280 status =
281 walk_state->descending_callback(walk_state,
282 &op);
283 if (ACPI_FAILURE(status)) {
284 ACPI_EXCEPTION((AE_INFO, status,
285 "During name lookup/catalog"));
286 goto close_this_op;
287 }
288
289 if (!op) {
290 continue;
291 }
292
293 status =
294 acpi_ps_next_parse_state(walk_state, op,
295 status);
296 if (status == AE_CTRL_PENDING) {
297 status = AE_OK;
298 goto close_this_op;
299 }
300
301 if (ACPI_FAILURE(status)) {
302 goto close_this_op;
303 }
304
305 acpi_ps_append_arg(op,
306 pre_op->common.value.arg);
307 acpi_gbl_depth++;
308
309 if (op->common.aml_opcode == AML_REGION_OP) {
310 /*
311 * Defer final parsing of an operation_region body,
312 * because we don't have enough info in the first pass
313 * to parse it correctly (i.e., there may be method
314 * calls within the term_arg elements of the body.)
315 *
316 * However, we must continue parsing because
317 * the opregion is not a standalone package --
318 * we don't know where the end is at this point.
319 *
320 * (Length is unknown until parse of the body complete)
321 */
322 op->named.data = aml_op_start;
323 op->named.length = 0;
324 }
325 } else {
326 /* Not a named opcode, just allocate Op and append to parent */
327
328 walk_state->op_info =
329 acpi_ps_get_opcode_info(walk_state->opcode);
330 op = acpi_ps_alloc_op(walk_state->opcode);
331 if (!op) {
332 status = AE_NO_MEMORY;
333 goto close_this_op;
334 }
335
336 if (walk_state->op_info->flags & AML_CREATE) {
337 /*
338 * Backup to beginning of create_xXXfield declaration
339 * body_length is unknown until we parse the body
340 */
341 op->named.data = aml_op_start;
342 op->named.length = 0;
343 }
344
345 acpi_ps_append_arg(acpi_ps_get_parent_scope
346 (parser_state), op);
347
348 if ((walk_state->descending_callback != NULL)) {
349 /*
350 * Find the object. This will either insert the object into
351 * the namespace or simply look it up
352 */
353 walk_state->op = op;
354
355 status =
356 walk_state->
357 descending_callback(walk_state,
358 &op);
359 status =
360 acpi_ps_next_parse_state(walk_state,
361 op,
362 status);
363 if (status == AE_CTRL_PENDING) {
364 status = AE_OK;
365 goto close_this_op;
366 }
367
368 if (ACPI_FAILURE(status)) {
369 goto close_this_op;
370 }
371 }
372 }
373
374 op->common.aml_offset = walk_state->aml_offset;
375
376 if (walk_state->op_info) {
377 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
378 "Opcode %4.4X [%s] Op %p Aml %p AmlOffset %5.5X\n",
379 (u32) op->common.aml_opcode,
380 walk_state->op_info->name, op,
381 parser_state->aml,
382 op->common.aml_offset));
383 }
384 }
385
386 /*
387 * Start arg_count at zero because we don't know if there are
388 * any args yet
389 */
390 walk_state->arg_count = 0;
391
392 /* Are there any arguments that must be processed? */
393
394 if (walk_state->arg_types) {
395
396 /* Get arguments */
397
398 switch (op->common.aml_opcode) {
399 case AML_BYTE_OP: /* AML_BYTEDATA_ARG */
400 case AML_WORD_OP: /* AML_WORDDATA_ARG */
401 case AML_DWORD_OP: /* AML_DWORDATA_ARG */
402 case AML_QWORD_OP: /* AML_QWORDATA_ARG */
403 case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */
404
405 /* Fill in constant or string argument directly */
406
407 acpi_ps_get_next_simple_arg(parser_state,
408 GET_CURRENT_ARG_TYPE
409 (walk_state->
410 arg_types), op);
411 break;
412
413 case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */
414
415 status =
416 acpi_ps_get_next_namepath(walk_state,
417 parser_state, op,
418 1);
419 if (ACPI_FAILURE(status)) {
420 goto close_this_op;
421 }
422
423 walk_state->arg_types = 0;
424 break;
425
426 default:
427 /*
428 * Op is not a constant or string, append each argument
429 * to the Op
430 */
431 while (GET_CURRENT_ARG_TYPE
432 (walk_state->arg_types)
433 && !walk_state->arg_count) {
434 walk_state->aml_offset = (u32)
435 ACPI_PTR_DIFF(parser_state->aml,
436 parser_state->
437 aml_start);
438
439 status =
440 acpi_ps_get_next_arg(walk_state,
441 parser_state,
442 GET_CURRENT_ARG_TYPE
443 (walk_state->
444 arg_types),
445 &arg);
446 if (ACPI_FAILURE(status)) {
447 goto close_this_op;
448 }
449
450 if (arg) {
451 arg->common.aml_offset =
452 walk_state->aml_offset;
453 acpi_ps_append_arg(op, arg);
454 }
455 INCREMENT_ARG_LIST(walk_state->
456 arg_types);
457 }
458
459 /* Special processing for certain opcodes */
460
461 /* TBD (remove): Temporary mechanism to disable this code if needed */
462
463 #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
464
465 if ((walk_state->pass_number <=
466 ACPI_IMODE_LOAD_PASS1)
467 &&
468 ((walk_state->
469 parse_flags & ACPI_PARSE_DISASSEMBLE) ==
470 0)) {
471 /*
472 * We want to skip If/Else/While constructs during Pass1
473 * because we want to actually conditionally execute the
474 * code during Pass2.
475 *
476 * Except for disassembly, where we always want to
477 * walk the If/Else/While packages
478 */
479 switch (op->common.aml_opcode) {
480 case AML_IF_OP:
481 case AML_ELSE_OP:
482 case AML_WHILE_OP:
483
484 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
485 "Pass1: Skipping an If/Else/While body\n"));
486
487 /* Skip body of if/else/while in pass 1 */
488
489 parser_state->aml =
490 parser_state->pkg_end;
491 walk_state->arg_count = 0;
492 break;
493
494 default:
495 break;
496 }
497 }
498 #endif
499 switch (op->common.aml_opcode) {
500 case AML_METHOD_OP:
501
502 /*
503 * Skip parsing of control method
504 * because we don't have enough info in the first pass
505 * to parse it correctly.
506 *
507 * Save the length and address of the body
508 */
509 op->named.data = parser_state->aml;
510 op->named.length =
511 (u32) (parser_state->pkg_end -
512 parser_state->aml);
513
514 /* Skip body of method */
515
516 parser_state->aml =
517 parser_state->pkg_end;
518 walk_state->arg_count = 0;
519 break;
520
521 case AML_BUFFER_OP:
522 case AML_PACKAGE_OP:
523 case AML_VAR_PACKAGE_OP:
524
525 if ((op->common.parent) &&
526 (op->common.parent->common.
527 aml_opcode == AML_NAME_OP)
528 && (walk_state->pass_number <=
529 ACPI_IMODE_LOAD_PASS2)) {
530 /*
531 * Skip parsing of Buffers and Packages
532 * because we don't have enough info in the first pass
533 * to parse them correctly.
534 */
535 op->named.data = aml_op_start;
536 op->named.length =
537 (u32) (parser_state->
538 pkg_end -
539 aml_op_start);
540
541 /* Skip body */
542
543 parser_state->aml =
544 parser_state->pkg_end;
545 walk_state->arg_count = 0;
546 }
547 break;
548
549 case AML_WHILE_OP:
550
551 if (walk_state->control_state) {
552 walk_state->control_state->
553 control.package_end =
554 parser_state->pkg_end;
555 }
556 break;
557
558 default:
559
560 /* No action for all other opcodes */
561 break;
562 }
563 break;
564 }
565 }
566
567 /* Check for arguments that need to be processed */
568
569 if (walk_state->arg_count) {
570 /*
571 * There are arguments (complex ones), push Op and
572 * prepare for argument
573 */
574 status = acpi_ps_push_scope(parser_state, op,
575 walk_state->arg_types,
576 walk_state->arg_count);
577 if (ACPI_FAILURE(status)) {
578 goto close_this_op;
579 }
580 op = NULL;
581 continue;
582 }
583
584 /*
585 * All arguments have been processed -- Op is complete,
586 * prepare for next
587 */
588 walk_state->op_info =
589 acpi_ps_get_opcode_info(op->common.aml_opcode);
590 if (walk_state->op_info->flags & AML_NAMED) {
591 if (acpi_gbl_depth) {
592 acpi_gbl_depth--;
593 }
594
595 if (op->common.aml_opcode == AML_REGION_OP) {
596 /*
597 * Skip parsing of control method or opregion body,
598 * because we don't have enough info in the first pass
599 * to parse them correctly.
600 *
601 * Completed parsing an op_region declaration, we now
602 * know the length.
603 */
604 op->named.length =
605 (u32) (parser_state->aml - op->named.data);
606 }
607 }
608
609 if (walk_state->op_info->flags & AML_CREATE) {
610 /*
611 * Backup to beginning of create_xXXfield declaration (1 for
612 * Opcode)
613 *
614 * body_length is unknown until we parse the body
615 */
616 op->named.length =
617 (u32) (parser_state->aml - op->named.data);
618 }
619
620 /* This op complete, notify the dispatcher */
621
622 if (walk_state->ascending_callback != NULL) {
623 walk_state->op = op;
624 walk_state->opcode = op->common.aml_opcode;
625
626 status = walk_state->ascending_callback(walk_state);
627 status =
628 acpi_ps_next_parse_state(walk_state, op, status);
629 if (status == AE_CTRL_PENDING) {
630 status = AE_OK;
631 goto close_this_op;
632 }
633 }
634
635 close_this_op:
636 /*
637 * Finished one argument of the containing scope
638 */
639 parser_state->scope->parse_scope.arg_count--;
640
641 /* Finished with pre_op */
642
643 if (pre_op) {
644 acpi_ps_free_op(pre_op);
645 pre_op = NULL;
646 }
647
648 /* Close this Op (will result in parse subtree deletion) */
649
650 status2 = acpi_ps_complete_this_op(walk_state, op);
651 if (ACPI_FAILURE(status2)) {
652 return_ACPI_STATUS(status2);
653 }
654 op = NULL;
655
656 switch (status) {
657 case AE_OK:
658 break;
659
660 case AE_CTRL_TRANSFER:
661
662 /* We are about to transfer to a called method. */
663
664 walk_state->prev_op = op;
665 walk_state->prev_arg_types = walk_state->arg_types;
666 return_ACPI_STATUS(status);
667
668 case AE_CTRL_END:
669
670 acpi_ps_pop_scope(parser_state, &op,
671 &walk_state->arg_types,
672 &walk_state->arg_count);
673
674 if (op) {
675 walk_state->op = op;
676 walk_state->op_info =
677 acpi_ps_get_opcode_info(op->common.
678 aml_opcode);
679 walk_state->opcode = op->common.aml_opcode;
680
681 status =
682 walk_state->ascending_callback(walk_state);
683 status =
684 acpi_ps_next_parse_state(walk_state, op,
685 status);
686
687 status2 =
688 acpi_ps_complete_this_op(walk_state, op);
689 if (ACPI_FAILURE(status2)) {
690 return_ACPI_STATUS(status2);
691 }
692 op = NULL;
693 }
694 status = AE_OK;
695 break;
696
697 case AE_CTRL_BREAK:
698 case AE_CTRL_CONTINUE:
699
700 /* Pop off scopes until we find the While */
701
702 while (!op || (op->common.aml_opcode != AML_WHILE_OP)) {
703 acpi_ps_pop_scope(parser_state, &op,
704 &walk_state->arg_types,
705 &walk_state->arg_count);
706
707 if (op->common.aml_opcode != AML_WHILE_OP) {
708 status2 =
709 acpi_ds_result_stack_pop
710 (walk_state);
711 if (ACPI_FAILURE(status2)) {
712 return_ACPI_STATUS(status2);
713 }
714 }
715 }
716
717 /* Close this iteration of the While loop */
718
719 walk_state->op = op;
720 walk_state->op_info =
721 acpi_ps_get_opcode_info(op->common.aml_opcode);
722 walk_state->opcode = op->common.aml_opcode;
723
724 status = walk_state->ascending_callback(walk_state);
725 status =
726 acpi_ps_next_parse_state(walk_state, op, status);
727
728 status2 = acpi_ps_complete_this_op(walk_state, op);
729 if (ACPI_FAILURE(status2)) {
730 return_ACPI_STATUS(status2);
731 }
732 op = NULL;
733
734 status = AE_OK;
735 break;
736
737 case AE_CTRL_TERMINATE:
738
739 status = AE_OK;
740
741 /* Clean up */
742 do {
743 if (op) {
744 status2 =
745 acpi_ps_complete_this_op(walk_state,
746 op);
747 if (ACPI_FAILURE(status2)) {
748 return_ACPI_STATUS(status2);
749 }
750
751 status2 =
752 acpi_ds_result_stack_pop
753 (walk_state);
754 if (ACPI_FAILURE(status2)) {
755 return_ACPI_STATUS(status2);
756 }
757
758 acpi_ut_delete_generic_state
759 (acpi_ut_pop_generic_state
760 (&walk_state->control_state));
761 }
762
763 acpi_ps_pop_scope(parser_state, &op,
764 &walk_state->arg_types,
765 &walk_state->arg_count);
766
767 } while (op);
768
769 return_ACPI_STATUS(status);
770
771 default: /* All other non-AE_OK status */
772
773 do {
774 if (op) {
775 status2 =
776 acpi_ps_complete_this_op(walk_state,
777 op);
778 if (ACPI_FAILURE(status2)) {
779 return_ACPI_STATUS(status2);
780 }
781 }
782
783 acpi_ps_pop_scope(parser_state, &op,
784 &walk_state->arg_types,
785 &walk_state->arg_count);
786
787 } while (op);
788
789 /*
790 * TBD: Cleanup parse ops on error
791 */
792 #if 0
793 if (op == NULL) {
794 acpi_ps_pop_scope(parser_state, &op,
795 &walk_state->arg_types,
796 &walk_state->arg_count);
797 }
798 #endif
799 walk_state->prev_op = op;
800 walk_state->prev_arg_types = walk_state->arg_types;
801 return_ACPI_STATUS(status);
802 }
803
804 /* This scope complete? */
805
806 if (acpi_ps_has_completed_scope(parser_state)) {
807 acpi_ps_pop_scope(parser_state, &op,
808 &walk_state->arg_types,
809 &walk_state->arg_count);
810 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
811 "Popped scope, Op=%p\n", op));
812 } else {
813 op = NULL;
814 }
815
816 } /* while parser_state->Aml */
817
818 /*
819 * Complete the last Op (if not completed), and clear the scope stack.
820 * It is easily possible to end an AML "package" with an unbounded number
821 * of open scopes (such as when several ASL blocks are closed with
822 * sequential closing braces). We want to terminate each one cleanly.
823 */
824 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "AML package complete at Op %p\n",
825 op));
826 do {
827 if (op) {
828 if (walk_state->ascending_callback != NULL) {
829 walk_state->op = op;
830 walk_state->op_info =
831 acpi_ps_get_opcode_info(op->common.
832 aml_opcode);
833 walk_state->opcode = op->common.aml_opcode;
834
835 status =
836 walk_state->ascending_callback(walk_state);
837 status =
838 acpi_ps_next_parse_state(walk_state, op,
839 status);
840 if (status == AE_CTRL_PENDING) {
841 status = AE_OK;
842 goto close_this_op;
843 }
844
845 if (status == AE_CTRL_TERMINATE) {
846 status = AE_OK;
847
848 /* Clean up */
849 do {
850 if (op) {
851 status2 =
852 acpi_ps_complete_this_op
853 (walk_state, op);
854 if (ACPI_FAILURE
855 (status2)) {
856 return_ACPI_STATUS
857 (status2);
858 }
859 }
860
861 acpi_ps_pop_scope(parser_state,
862 &op,
863 &walk_state->
864 arg_types,
865 &walk_state->
866 arg_count);
867
868 } while (op);
869
870 return_ACPI_STATUS(status);
871 }
872
873 else if (ACPI_FAILURE(status)) {
874
875 /* First error is most important */
876
877 (void)
878 acpi_ps_complete_this_op(walk_state,
879 op);
880 return_ACPI_STATUS(status);
881 }
882 }
883
884 status2 = acpi_ps_complete_this_op(walk_state, op);
885 if (ACPI_FAILURE(status2)) {
886 return_ACPI_STATUS(status2);
887 }
888 }
889
890 acpi_ps_pop_scope(parser_state, &op, &walk_state->arg_types,
891 &walk_state->arg_count);
892
893 } while (op);
894
895 return_ACPI_STATUS(status);
896 }
Linux kernel - Deliverables
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