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ACPICA: Implemented full support for deferred execution for the TermArg string argume...
[linux-2.6/x86.git] / drivers / acpi / parser / psloop.c
bloba079975f671fbd5aee3281b308dddf08bae4c669
1 /******************************************************************************
2 *
3 * Module Name: psloop - Main AML parse loop
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2007, 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, (such as
46 * Perl) do. Parsing is done by hand rather than with a YACC generated parser
47 * to tightly constrain stack and dynamic memory usage. Parsing is kept
48 * flexible and the code fairly compact by parsing based on a list of AML
49 * opcode templates in aml_op_info[].
50 */
51
52 #include <acpi/acpi.h>
53 #include <acpi/acparser.h>
54 #include <acpi/acdispat.h>
55 #include <acpi/amlcode.h>
56
57 #define _COMPONENT ACPI_PARSER
58 ACPI_MODULE_NAME("psloop")
59
60 static u32 acpi_gbl_depth = 0;
61
62 /* Local prototypes */
63
64 static acpi_status acpi_ps_get_aml_opcode(struct acpi_walk_state *walk_state);
65
66 static acpi_status
67 acpi_ps_build_named_op(struct acpi_walk_state *walk_state,
68 u8 * aml_op_start,
69 union acpi_parse_object *unnamed_op,
70 union acpi_parse_object **op);
71
72 static acpi_status
73 acpi_ps_create_op(struct acpi_walk_state *walk_state,
74 u8 * aml_op_start, union acpi_parse_object **new_op);
75
76 static acpi_status
77 acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
78 u8 * aml_op_start, union acpi_parse_object *op);
79
80 static acpi_status
81 acpi_ps_complete_op(struct acpi_walk_state *walk_state,
82 union acpi_parse_object **op, acpi_status status);
83
84 static acpi_status
85 acpi_ps_complete_final_op(struct acpi_walk_state *walk_state,
86 union acpi_parse_object *op, acpi_status status);
87
88 /*******************************************************************************
89 *
90 * FUNCTION: acpi_ps_get_aml_opcode
91 *
92 * PARAMETERS: walk_state - Current state
93 *
94 * RETURN: Status
95 *
96 * DESCRIPTION: Extract the next AML opcode from the input stream.
97 *
98 ******************************************************************************/
99
100 static acpi_status acpi_ps_get_aml_opcode(struct acpi_walk_state *walk_state)
101 {
102
103 ACPI_FUNCTION_TRACE_PTR(ps_get_aml_opcode, walk_state);
104
105 walk_state->aml_offset =
106 (u32) ACPI_PTR_DIFF(walk_state->parser_state.aml,
107 walk_state->parser_state.aml_start);
108 walk_state->opcode = acpi_ps_peek_opcode(&(walk_state->parser_state));
109
110 /*
111 * First cut to determine what we have found:
112 * 1) A valid AML opcode
113 * 2) A name string
114 * 3) An unknown/invalid opcode
115 */
116 walk_state->op_info = acpi_ps_get_opcode_info(walk_state->opcode);
117
118 switch (walk_state->op_info->class) {
119 case AML_CLASS_ASCII:
120 case AML_CLASS_PREFIX:
121 /*
122 * Starts with a valid prefix or ASCII char, this is a name
123 * string. Convert the bare name string to a namepath.
124 */
125 walk_state->opcode = AML_INT_NAMEPATH_OP;
126 walk_state->arg_types = ARGP_NAMESTRING;
127 break;
128
129 case AML_CLASS_UNKNOWN:
130
131 /* The opcode is unrecognized. Just skip unknown opcodes */
132
133 ACPI_ERROR((AE_INFO,
134 "Found unknown opcode %X at AML address %p offset %X, ignoring",
135 walk_state->opcode, walk_state->parser_state.aml,
136 walk_state->aml_offset));
137
138 ACPI_DUMP_BUFFER(walk_state->parser_state.aml, 128);
139
140 /* Assume one-byte bad opcode */
141
142 walk_state->parser_state.aml++;
143 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
144
145 default:
146
147 /* Found opcode info, this is a normal opcode */
148
149 walk_state->parser_state.aml +=
150 acpi_ps_get_opcode_size(walk_state->opcode);
151 walk_state->arg_types = walk_state->op_info->parse_args;
152 break;
153 }
154
155 return_ACPI_STATUS(AE_OK);
156 }
157
158 /*******************************************************************************
159 *
160 * FUNCTION: acpi_ps_build_named_op
161 *
162 * PARAMETERS: walk_state - Current state
163 * aml_op_start - Begin of named Op in AML
164 * unnamed_op - Early Op (not a named Op)
165 * Op - Returned Op
166 *
167 * RETURN: Status
168 *
169 * DESCRIPTION: Parse a named Op
170 *
171 ******************************************************************************/
172
173 static acpi_status
174 acpi_ps_build_named_op(struct acpi_walk_state *walk_state,
175 u8 * aml_op_start,
176 union acpi_parse_object *unnamed_op,
177 union acpi_parse_object **op)
178 {
179 acpi_status status = AE_OK;
180 union acpi_parse_object *arg = NULL;
181
182 ACPI_FUNCTION_TRACE_PTR(ps_build_named_op, walk_state);
183
184 unnamed_op->common.value.arg = NULL;
185 unnamed_op->common.arg_list_length = 0;
186 unnamed_op->common.aml_opcode = walk_state->opcode;
187
188 /*
189 * Get and append arguments until we find the node that contains
190 * the name (the type ARGP_NAME).
191 */
192 while (GET_CURRENT_ARG_TYPE(walk_state->arg_types) &&
193 (GET_CURRENT_ARG_TYPE(walk_state->arg_types) != ARGP_NAME)) {
194 status =
195 acpi_ps_get_next_arg(walk_state,
196 &(walk_state->parser_state),
197 GET_CURRENT_ARG_TYPE(walk_state->
198 arg_types), &arg);
199 if (ACPI_FAILURE(status)) {
200 return_ACPI_STATUS(status);
201 }
202
203 acpi_ps_append_arg(unnamed_op, arg);
204 INCREMENT_ARG_LIST(walk_state->arg_types);
205 }
206
207 /*
208 * Make sure that we found a NAME and didn't run out of arguments
209 */
210 if (!GET_CURRENT_ARG_TYPE(walk_state->arg_types)) {
211 return_ACPI_STATUS(AE_AML_NO_OPERAND);
212 }
213
214 /* We know that this arg is a name, move to next arg */
215
216 INCREMENT_ARG_LIST(walk_state->arg_types);
217
218 /*
219 * Find the object. This will either insert the object into
220 * the namespace or simply look it up
221 */
222 walk_state->op = NULL;
223
224 status = walk_state->descending_callback(walk_state, op);
225 if (ACPI_FAILURE(status)) {
226 ACPI_EXCEPTION((AE_INFO, status, "During name lookup/catalog"));
227 return_ACPI_STATUS(status);
228 }
229
230 if (!*op) {
231 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
232 }
233
234 status = acpi_ps_next_parse_state(walk_state, *op, status);
235 if (ACPI_FAILURE(status)) {
236 if (status == AE_CTRL_PENDING) {
237 return_ACPI_STATUS(AE_CTRL_PARSE_PENDING);
238 }
239 return_ACPI_STATUS(status);
240 }
241
242 acpi_ps_append_arg(*op, unnamed_op->common.value.arg);
243 acpi_gbl_depth++;
244
245 if ((*op)->common.aml_opcode == AML_REGION_OP ||
246 (*op)->common.aml_opcode == AML_DATA_REGION_OP) {
247 /*
248 * Defer final parsing of an operation_region body, because we don't
249 * have enough info in the first pass to parse it correctly (i.e.,
250 * there may be method calls within the term_arg elements of the body.)
251 *
252 * However, we must continue parsing because the opregion is not a
253 * standalone package -- we don't know where the end is at this point.
254 *
255 * (Length is unknown until parse of the body complete)
256 */
257 (*op)->named.data = aml_op_start;
258 (*op)->named.length = 0;
259 }
260
261 return_ACPI_STATUS(AE_OK);
262 }
263
264 /*******************************************************************************
265 *
266 * FUNCTION: acpi_ps_create_op
267 *
268 * PARAMETERS: walk_state - Current state
269 * aml_op_start - Op start in AML
270 * new_op - Returned Op
271 *
272 * RETURN: Status
273 *
274 * DESCRIPTION: Get Op from AML
275 *
276 ******************************************************************************/
277
278 static acpi_status
279 acpi_ps_create_op(struct acpi_walk_state *walk_state,
280 u8 * aml_op_start, union acpi_parse_object **new_op)
281 {
282 acpi_status status = AE_OK;
283 union acpi_parse_object *op;
284 union acpi_parse_object *named_op = NULL;
285 union acpi_parse_object *parent_scope;
286 u8 argument_count;
287 const struct acpi_opcode_info *op_info;
288
289 ACPI_FUNCTION_TRACE_PTR(ps_create_op, walk_state);
290
291 status = acpi_ps_get_aml_opcode(walk_state);
292 if (status == AE_CTRL_PARSE_CONTINUE) {
293 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
294 }
295
296 /* Create Op structure and append to parent's argument list */
297
298 walk_state->op_info = acpi_ps_get_opcode_info(walk_state->opcode);
299 op = acpi_ps_alloc_op(walk_state->opcode);
300 if (!op) {
301 return_ACPI_STATUS(AE_NO_MEMORY);
302 }
303
304 if (walk_state->op_info->flags & AML_NAMED) {
305 status =
306 acpi_ps_build_named_op(walk_state, aml_op_start, op,
307 &named_op);
308 acpi_ps_free_op(op);
309 if (ACPI_FAILURE(status)) {
310 return_ACPI_STATUS(status);
311 }
312
313 *new_op = named_op;
314 return_ACPI_STATUS(AE_OK);
315 }
316
317 /* Not a named opcode, just allocate Op and append to parent */
318
319 if (walk_state->op_info->flags & AML_CREATE) {
320 /*
321 * Backup to beginning of create_xXXfield declaration
322 * body_length is unknown until we parse the body
323 */
324 op->named.data = aml_op_start;
325 op->named.length = 0;
326 }
327
328 parent_scope = acpi_ps_get_parent_scope(&(walk_state->parser_state));
329 acpi_ps_append_arg(parent_scope, op);
330
331 if (parent_scope) {
332 op_info =
333 acpi_ps_get_opcode_info(parent_scope->common.aml_opcode);
334 if (op_info->flags & AML_HAS_TARGET) {
335 argument_count =
336 acpi_ps_get_argument_count(op_info->type);
337 if (parent_scope->common.arg_list_length >
338 argument_count) {
339 op->common.flags |= ACPI_PARSEOP_TARGET;
340 }
341 } else if (parent_scope->common.aml_opcode == AML_INCREMENT_OP) {
342 op->common.flags |= ACPI_PARSEOP_TARGET;
343 }
344 }
345
346 if (walk_state->descending_callback != NULL) {
347 /*
348 * Find the object. This will either insert the object into
349 * the namespace or simply look it up
350 */
351 walk_state->op = *new_op = op;
352
353 status = walk_state->descending_callback(walk_state, &op);
354 status = acpi_ps_next_parse_state(walk_state, op, status);
355 if (status == AE_CTRL_PENDING) {
356 status = AE_CTRL_PARSE_PENDING;
357 }
358 }
359
360 return_ACPI_STATUS(status);
361 }
362
363 /*******************************************************************************
364 *
365 * FUNCTION: acpi_ps_get_arguments
366 *
367 * PARAMETERS: walk_state - Current state
368 * aml_op_start - Op start in AML
369 * Op - Current Op
370 *
371 * RETURN: Status
372 *
373 * DESCRIPTION: Get arguments for passed Op.
374 *
375 ******************************************************************************/
376
377 static acpi_status
378 acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
379 u8 * aml_op_start, union acpi_parse_object *op)
380 {
381 acpi_status status = AE_OK;
382 union acpi_parse_object *arg = NULL;
383
384 ACPI_FUNCTION_TRACE_PTR(ps_get_arguments, walk_state);
385
386 switch (op->common.aml_opcode) {
387 case AML_BYTE_OP: /* AML_BYTEDATA_ARG */
388 case AML_WORD_OP: /* AML_WORDDATA_ARG */
389 case AML_DWORD_OP: /* AML_DWORDATA_ARG */
390 case AML_QWORD_OP: /* AML_QWORDATA_ARG */
391 case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */
392
393 /* Fill in constant or string argument directly */
394
395 acpi_ps_get_next_simple_arg(&(walk_state->parser_state),
396 GET_CURRENT_ARG_TYPE(walk_state->
397 arg_types),
398 op);
399 break;
400
401 case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */
402
403 status =
404 acpi_ps_get_next_namepath(walk_state,
405 &(walk_state->parser_state), op,
406 1);
407 if (ACPI_FAILURE(status)) {
408 return_ACPI_STATUS(status);
409 }
410
411 walk_state->arg_types = 0;
412 break;
413
414 default:
415 /*
416 * Op is not a constant or string, append each argument to the Op
417 */
418 while (GET_CURRENT_ARG_TYPE(walk_state->arg_types)
419 && !walk_state->arg_count) {
420 walk_state->aml_offset =
421 (u32) ACPI_PTR_DIFF(walk_state->parser_state.aml,
422 walk_state->parser_state.
423 aml_start);
424
425 status =
426 acpi_ps_get_next_arg(walk_state,
427 &(walk_state->parser_state),
428 GET_CURRENT_ARG_TYPE
429 (walk_state->arg_types), &arg);
430 if (ACPI_FAILURE(status)) {
431 return_ACPI_STATUS(status);
432 }
433
434 if (arg) {
435 arg->common.aml_offset = walk_state->aml_offset;
436 acpi_ps_append_arg(op, arg);
437 }
438
439 INCREMENT_ARG_LIST(walk_state->arg_types);
440 }
441
442 /* Special processing for certain opcodes */
443
444 /* TBD (remove): Temporary mechanism to disable this code if needed */
445
446 #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
447
448 if ((walk_state->pass_number <= ACPI_IMODE_LOAD_PASS1) &&
449 ((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) == 0)) {
450 /*
451 * We want to skip If/Else/While constructs during Pass1 because we
452 * want to actually conditionally execute the code during Pass2.
453 *
454 * Except for disassembly, where we always want to walk the
455 * If/Else/While packages
456 */
457 switch (op->common.aml_opcode) {
458 case AML_IF_OP:
459 case AML_ELSE_OP:
460 case AML_WHILE_OP:
461
462 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
463 "Pass1: Skipping an If/Else/While body\n"));
464
465 /* Skip body of if/else/while in pass 1 */
466
467 walk_state->parser_state.aml =
468 walk_state->parser_state.pkg_end;
469 walk_state->arg_count = 0;
470 break;
471
472 default:
473 break;
474 }
475 }
476 #endif
477
478 switch (op->common.aml_opcode) {
479 case AML_METHOD_OP:
480 /*
481 * Skip parsing of control method because we don't have enough
482 * info in the first pass to parse it correctly.
483 *
484 * Save the length and address of the body
485 */
486 op->named.data = walk_state->parser_state.aml;
487 op->named.length = (u32)
488 (walk_state->parser_state.pkg_end -
489 walk_state->parser_state.aml);
490
491 /* Skip body of method */
492
493 walk_state->parser_state.aml =
494 walk_state->parser_state.pkg_end;
495 walk_state->arg_count = 0;
496 break;
497
498 case AML_BUFFER_OP:
499 case AML_PACKAGE_OP:
500 case AML_VAR_PACKAGE_OP:
501
502 if ((op->common.parent) &&
503 (op->common.parent->common.aml_opcode ==
504 AML_NAME_OP)
505 && (walk_state->pass_number <=
506 ACPI_IMODE_LOAD_PASS2)) {
507 /*
508 * Skip parsing of Buffers and Packages because we don't have
509 * enough info in the first pass to parse them correctly.
510 */
511 op->named.data = aml_op_start;
512 op->named.length = (u32)
513 (walk_state->parser_state.pkg_end -
514 aml_op_start);
515
516 /* Skip body */
517
518 walk_state->parser_state.aml =
519 walk_state->parser_state.pkg_end;
520 walk_state->arg_count = 0;
521 }
522 break;
523
524 case AML_WHILE_OP:
525
526 if (walk_state->control_state) {
527 walk_state->control_state->control.package_end =
528 walk_state->parser_state.pkg_end;
529 }
530 break;
531
532 default:
533
534 /* No action for all other opcodes */
535 break;
536 }
537
538 break;
539 }
540
541 return_ACPI_STATUS(AE_OK);
542 }
543
544 /*******************************************************************************
545 *
546 * FUNCTION: acpi_ps_complete_op
547 *
548 * PARAMETERS: walk_state - Current state
549 * Op - Returned Op
550 * Status - Parse status before complete Op
551 *
552 * RETURN: Status
553 *
554 * DESCRIPTION: Complete Op
555 *
556 ******************************************************************************/
557
558 static acpi_status
559 acpi_ps_complete_op(struct acpi_walk_state *walk_state,
560 union acpi_parse_object **op, acpi_status status)
561 {
562 acpi_status status2;
563
564 ACPI_FUNCTION_TRACE_PTR(ps_complete_op, walk_state);
565
566 /*
567 * Finished one argument of the containing scope
568 */
569 walk_state->parser_state.scope->parse_scope.arg_count--;
570
571 /* Close this Op (will result in parse subtree deletion) */
572
573 status2 = acpi_ps_complete_this_op(walk_state, *op);
574 if (ACPI_FAILURE(status2)) {
575 return_ACPI_STATUS(status2);
576 }
577
578 *op = NULL;
579
580 switch (status) {
581 case AE_OK:
582 break;
583
584 case AE_CTRL_TRANSFER:
585
586 /* We are about to transfer to a called method */
587
588 walk_state->prev_op = NULL;
589 walk_state->prev_arg_types = walk_state->arg_types;
590 return_ACPI_STATUS(status);
591
592 case AE_CTRL_END:
593
594 acpi_ps_pop_scope(&(walk_state->parser_state), op,
595 &walk_state->arg_types,
596 &walk_state->arg_count);
597
598 if (*op) {
599 walk_state->op = *op;
600 walk_state->op_info =
601 acpi_ps_get_opcode_info((*op)->common.aml_opcode);
602 walk_state->opcode = (*op)->common.aml_opcode;
603
604 status = walk_state->ascending_callback(walk_state);
605 status =
606 acpi_ps_next_parse_state(walk_state, *op, status);
607
608 status2 = acpi_ps_complete_this_op(walk_state, *op);
609 if (ACPI_FAILURE(status2)) {
610 return_ACPI_STATUS(status2);
611 }
612 }
613
614 status = AE_OK;
615 break;
616
617 case AE_CTRL_BREAK:
618 case AE_CTRL_CONTINUE:
619
620 /* Pop off scopes until we find the While */
621
622 while (!(*op) || ((*op)->common.aml_opcode != AML_WHILE_OP)) {
623 acpi_ps_pop_scope(&(walk_state->parser_state), op,
624 &walk_state->arg_types,
625 &walk_state->arg_count);
626 }
627
628 /* Close this iteration of the While loop */
629
630 walk_state->op = *op;
631 walk_state->op_info =
632 acpi_ps_get_opcode_info((*op)->common.aml_opcode);
633 walk_state->opcode = (*op)->common.aml_opcode;
634
635 status = walk_state->ascending_callback(walk_state);
636 status = acpi_ps_next_parse_state(walk_state, *op, status);
637
638 status2 = acpi_ps_complete_this_op(walk_state, *op);
639 if (ACPI_FAILURE(status2)) {
640 return_ACPI_STATUS(status2);
641 }
642
643 status = AE_OK;
644 break;
645
646 case AE_CTRL_TERMINATE:
647
648 /* Clean up */
649 do {
650 if (*op) {
651 status2 =
652 acpi_ps_complete_this_op(walk_state, *op);
653 if (ACPI_FAILURE(status2)) {
654 return_ACPI_STATUS(status2);
655 }
656
657 acpi_ut_delete_generic_state
658 (acpi_ut_pop_generic_state
659 (&walk_state->control_state));
660 }
661
662 acpi_ps_pop_scope(&(walk_state->parser_state), op,
663 &walk_state->arg_types,
664 &walk_state->arg_count);
665
666 } while (*op);
667
668 return_ACPI_STATUS(AE_OK);
669
670 default: /* All other non-AE_OK status */
671
672 do {
673 if (*op) {
674 status2 =
675 acpi_ps_complete_this_op(walk_state, *op);
676 if (ACPI_FAILURE(status2)) {
677 return_ACPI_STATUS(status2);
678 }
679 }
680
681 acpi_ps_pop_scope(&(walk_state->parser_state), op,
682 &walk_state->arg_types,
683 &walk_state->arg_count);
684
685 } while (*op);
686
687 #if 0
688 /*
689 * TBD: Cleanup parse ops on error
690 */
691 if (*op == NULL) {
692 acpi_ps_pop_scope(parser_state, op,
693 &walk_state->arg_types,
694 &walk_state->arg_count);
695 }
696 #endif
697 walk_state->prev_op = NULL;
698 walk_state->prev_arg_types = walk_state->arg_types;
699 return_ACPI_STATUS(status);
700 }
701
702 /* This scope complete? */
703
704 if (acpi_ps_has_completed_scope(&(walk_state->parser_state))) {
705 acpi_ps_pop_scope(&(walk_state->parser_state), op,
706 &walk_state->arg_types,
707 &walk_state->arg_count);
708 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Popped scope, Op=%p\n", *op));
709 } else {
710 *op = NULL;
711 }
712
713 return_ACPI_STATUS(AE_OK);
714 }
715
716 /*******************************************************************************
717 *
718 * FUNCTION: acpi_ps_complete_final_op
719 *
720 * PARAMETERS: walk_state - Current state
721 * Op - Current Op
722 * Status - Current parse status before complete last
723 * Op
724 *
725 * RETURN: Status
726 *
727 * DESCRIPTION: Complete last Op.
728 *
729 ******************************************************************************/
730
731 static acpi_status
732 acpi_ps_complete_final_op(struct acpi_walk_state *walk_state,
733 union acpi_parse_object *op, acpi_status status)
734 {
735 acpi_status status2;
736
737 ACPI_FUNCTION_TRACE_PTR(ps_complete_final_op, walk_state);
738
739 /*
740 * Complete the last Op (if not completed), and clear the scope stack.
741 * It is easily possible to end an AML "package" with an unbounded number
742 * of open scopes (such as when several ASL blocks are closed with
743 * sequential closing braces). We want to terminate each one cleanly.
744 */
745 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "AML package complete at Op %p\n",
746 op));
747 do {
748 if (op) {
749 if (walk_state->ascending_callback != NULL) {
750 walk_state->op = op;
751 walk_state->op_info =
752 acpi_ps_get_opcode_info(op->common.
753 aml_opcode);
754 walk_state->opcode = op->common.aml_opcode;
755
756 status =
757 walk_state->ascending_callback(walk_state);
758 status =
759 acpi_ps_next_parse_state(walk_state, op,
760 status);
761 if (status == AE_CTRL_PENDING) {
762 status =
763 acpi_ps_complete_op(walk_state, &op,
764 AE_OK);
765 if (ACPI_FAILURE(status)) {
766 return_ACPI_STATUS(status);
767 }
768 }
769
770 if (status == AE_CTRL_TERMINATE) {
771 status = AE_OK;
772
773 /* Clean up */
774 do {
775 if (op) {
776 status2 =
777 acpi_ps_complete_this_op
778 (walk_state, op);
779 if (ACPI_FAILURE
780 (status2)) {
781 return_ACPI_STATUS
782 (status2);
783 }
784 }
785
786 acpi_ps_pop_scope(&
787 (walk_state->
788 parser_state),
789 &op,
790 &walk_state->
791 arg_types,
792 &walk_state->
793 arg_count);
794
795 } while (op);
796
797 return_ACPI_STATUS(status);
798 }
799
800 else if (ACPI_FAILURE(status)) {
801
802 /* First error is most important */
803
804 (void)
805 acpi_ps_complete_this_op(walk_state,
806 op);
807 return_ACPI_STATUS(status);
808 }
809 }
810
811 status2 = acpi_ps_complete_this_op(walk_state, op);
812 if (ACPI_FAILURE(status2)) {
813 return_ACPI_STATUS(status2);
814 }
815 }
816
817 acpi_ps_pop_scope(&(walk_state->parser_state), &op,
818 &walk_state->arg_types,
819 &walk_state->arg_count);
820
821 } while (op);
822
823 return_ACPI_STATUS(status);
824 }
825
826 /*******************************************************************************
827 *
828 * FUNCTION: acpi_ps_parse_loop
829 *
830 * PARAMETERS: walk_state - Current state
831 *
832 * RETURN: Status
833 *
834 * DESCRIPTION: Parse AML (pointed to by the current parser state) and return
835 * a tree of ops.
836 *
837 ******************************************************************************/
838
839 acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state)
840 {
841 acpi_status status = AE_OK;
842 union acpi_parse_object *op = NULL; /* current op */
843 struct acpi_parse_state *parser_state;
844 u8 *aml_op_start = NULL;
845
846 ACPI_FUNCTION_TRACE_PTR(ps_parse_loop, walk_state);
847
848 if (walk_state->descending_callback == NULL) {
849 return_ACPI_STATUS(AE_BAD_PARAMETER);
850 }
851
852 parser_state = &walk_state->parser_state;
853 walk_state->arg_types = 0;
854
855 #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
856
857 if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) {
858
859 /* We are restarting a preempted control method */
860
861 if (acpi_ps_has_completed_scope(parser_state)) {
862 /*
863 * We must check if a predicate to an IF or WHILE statement
864 * was just completed
865 */
866 if ((parser_state->scope->parse_scope.op) &&
867 ((parser_state->scope->parse_scope.op->common.
868 aml_opcode == AML_IF_OP)
869 || (parser_state->scope->parse_scope.op->common.
870 aml_opcode == AML_WHILE_OP))
871 && (walk_state->control_state)
872 && (walk_state->control_state->common.state ==
873 ACPI_CONTROL_PREDICATE_EXECUTING)) {
874 /*
875 * A predicate was just completed, get the value of the
876 * predicate and branch based on that value
877 */
878 walk_state->op = NULL;
879 status =
880 acpi_ds_get_predicate_value(walk_state,
881 ACPI_TO_POINTER
882 (TRUE));
883 if (ACPI_FAILURE(status)
884 && ((status & AE_CODE_MASK) !=
885 AE_CODE_CONTROL)) {
886 if (status == AE_AML_NO_RETURN_VALUE) {
887 ACPI_EXCEPTION((AE_INFO, status,
888 "Invoked method did not return a value"));
889
890 }
891
892 ACPI_EXCEPTION((AE_INFO, status,
893 "GetPredicate Failed"));
894 return_ACPI_STATUS(status);
895 }
896
897 status =
898 acpi_ps_next_parse_state(walk_state, op,
899 status);
900 }
901
902 acpi_ps_pop_scope(parser_state, &op,
903 &walk_state->arg_types,
904 &walk_state->arg_count);
905 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
906 "Popped scope, Op=%p\n", op));
907 } else if (walk_state->prev_op) {
908
909 /* We were in the middle of an op */
910
911 op = walk_state->prev_op;
912 walk_state->arg_types = walk_state->prev_arg_types;
913 }
914 }
915 #endif
916
917 /* Iterative parsing loop, while there is more AML to process: */
918
919 while ((parser_state->aml < parser_state->aml_end) || (op)) {
920 aml_op_start = parser_state->aml;
921 if (!op) {
922 status =
923 acpi_ps_create_op(walk_state, aml_op_start, &op);
924 if (ACPI_FAILURE(status)) {
925 if (status == AE_CTRL_PARSE_CONTINUE) {
926 continue;
927 }
928
929 if (status == AE_CTRL_PARSE_PENDING) {
930 status = AE_OK;
931 }
932
933 status =
934 acpi_ps_complete_op(walk_state, &op,
935 status);
936 if (ACPI_FAILURE(status)) {
937 return_ACPI_STATUS(status);
938 }
939
940 continue;
941 }
942
943 op->common.aml_offset = walk_state->aml_offset;
944
945 if (walk_state->op_info) {
946 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
947 "Opcode %4.4X [%s] Op %p Aml %p AmlOffset %5.5X\n",
948 (u32) op->common.aml_opcode,
949 walk_state->op_info->name, op,
950 parser_state->aml,
951 op->common.aml_offset));
952 }
953 }
954
955 /*
956 * Start arg_count at zero because we don't know if there are
957 * any args yet
958 */
959 walk_state->arg_count = 0;
960
961 /* Are there any arguments that must be processed? */
962
963 if (walk_state->arg_types) {
964
965 /* Get arguments */
966
967 status =
968 acpi_ps_get_arguments(walk_state, aml_op_start, op);
969 if (ACPI_FAILURE(status)) {
970 status =
971 acpi_ps_complete_op(walk_state, &op,
972 status);
973 if (ACPI_FAILURE(status)) {
974 return_ACPI_STATUS(status);
975 }
976
977 continue;
978 }
979 }
980
981 /* Check for arguments that need to be processed */
982
983 if (walk_state->arg_count) {
984 /*
985 * There are arguments (complex ones), push Op and
986 * prepare for argument
987 */
988 status = acpi_ps_push_scope(parser_state, op,
989 walk_state->arg_types,
990 walk_state->arg_count);
991 if (ACPI_FAILURE(status)) {
992 status =
993 acpi_ps_complete_op(walk_state, &op,
994 status);
995 if (ACPI_FAILURE(status)) {
996 return_ACPI_STATUS(status);
997 }
998
999 continue;
1000 }
1001
1002 op = NULL;
1003 continue;
1004 }
1005
1006 /*
1007 * All arguments have been processed -- Op is complete,
1008 * prepare for next
1009 */
1010 walk_state->op_info =
1011 acpi_ps_get_opcode_info(op->common.aml_opcode);
1012 if (walk_state->op_info->flags & AML_NAMED) {
1013 if (acpi_gbl_depth) {
1014 acpi_gbl_depth--;
1015 }
1016
1017 if (op->common.aml_opcode == AML_REGION_OP ||
1018 op->common.aml_opcode == AML_DATA_REGION_OP) {
1019 /*
1020 * Skip parsing of control method or opregion body,
1021 * because we don't have enough info in the first pass
1022 * to parse them correctly.
1023 *
1024 * Completed parsing an op_region declaration, we now
1025 * know the length.
1026 */
1027 op->named.length =
1028 (u32) (parser_state->aml - op->named.data);
1029 }
1030 }
1031
1032 if (walk_state->op_info->flags & AML_CREATE) {
1033 /*
1034 * Backup to beginning of create_xXXfield declaration (1 for
1035 * Opcode)
1036 *
1037 * body_length is unknown until we parse the body
1038 */
1039 op->named.length =
1040 (u32) (parser_state->aml - op->named.data);
1041 }
1042
1043 /* This op complete, notify the dispatcher */
1044
1045 if (walk_state->ascending_callback != NULL) {
1046 walk_state->op = op;
1047 walk_state->opcode = op->common.aml_opcode;
1048
1049 status = walk_state->ascending_callback(walk_state);
1050 status =
1051 acpi_ps_next_parse_state(walk_state, op, status);
1052 if (status == AE_CTRL_PENDING) {
1053 status = AE_OK;
1054 }
1055 }
1056
1057 status = acpi_ps_complete_op(walk_state, &op, status);
1058 if (ACPI_FAILURE(status)) {
1059 return_ACPI_STATUS(status);
1060 }
1061
1062 } /* while parser_state->Aml */
1063
1064 status = acpi_ps_complete_final_op(walk_state, op, status);
1065 return_ACPI_STATUS(status);
1066 }
x86 "subsystem" repository