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