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sched: make early bootup sched_clock() use safer
[wrt350n-kernel.git] / drivers / acpi / parser / psloop.c
blob773aee82fbb8e18fb5edf7ed349c220935e0e4ea
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.aml_opcode = walk_state->opcode;
186
187 /*
188 * Get and append arguments until we find the node that contains
189 * the name (the type ARGP_NAME).
190 */
191 while (GET_CURRENT_ARG_TYPE(walk_state->arg_types) &&
192 (GET_CURRENT_ARG_TYPE(walk_state->arg_types) != ARGP_NAME)) {
193 status =
194 acpi_ps_get_next_arg(walk_state,
195 &(walk_state->parser_state),
196 GET_CURRENT_ARG_TYPE(walk_state->
197 arg_types), &arg);
198 if (ACPI_FAILURE(status)) {
199 return_ACPI_STATUS(status);
200 }
201
202 acpi_ps_append_arg(unnamed_op, arg);
203 INCREMENT_ARG_LIST(walk_state->arg_types);
204 }
205
206 /*
207 * Make sure that we found a NAME and didn't run out of arguments
208 */
209 if (!GET_CURRENT_ARG_TYPE(walk_state->arg_types)) {
210 return_ACPI_STATUS(AE_AML_NO_OPERAND);
211 }
212
213 /* We know that this arg is a name, move to next arg */
214
215 INCREMENT_ARG_LIST(walk_state->arg_types);
216
217 /*
218 * Find the object. This will either insert the object into
219 * the namespace or simply look it up
220 */
221 walk_state->op = NULL;
222
223 status = walk_state->descending_callback(walk_state, op);
224 if (ACPI_FAILURE(status)) {
225 ACPI_EXCEPTION((AE_INFO, status, "During name lookup/catalog"));
226 return_ACPI_STATUS(status);
227 }
228
229 if (!*op) {
230 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
231 }
232
233 status = acpi_ps_next_parse_state(walk_state, *op, status);
234 if (ACPI_FAILURE(status)) {
235 if (status == AE_CTRL_PENDING) {
236 return_ACPI_STATUS(AE_CTRL_PARSE_PENDING);
237 }
238 return_ACPI_STATUS(status);
239 }
240
241 acpi_ps_append_arg(*op, unnamed_op->common.value.arg);
242 acpi_gbl_depth++;
243
244 if ((*op)->common.aml_opcode == AML_REGION_OP) {
245 /*
246 * Defer final parsing of an operation_region body, because we don't
247 * have enough info in the first pass to parse it correctly (i.e.,
248 * there may be method calls within the term_arg elements of the body.)
249 *
250 * However, we must continue parsing because the opregion is not a
251 * standalone package -- we don't know where the end is at this point.
252 *
253 * (Length is unknown until parse of the body complete)
254 */
255 (*op)->named.data = aml_op_start;
256 (*op)->named.length = 0;
257 }
258
259 return_ACPI_STATUS(AE_OK);
260 }
261
262 /*******************************************************************************
263 *
264 * FUNCTION: acpi_ps_create_op
265 *
266 * PARAMETERS: walk_state - Current state
267 * aml_op_start - Op start in AML
268 * new_op - Returned Op
269 *
270 * RETURN: Status
271 *
272 * DESCRIPTION: Get Op from AML
273 *
274 ******************************************************************************/
275
276 static acpi_status
277 acpi_ps_create_op(struct acpi_walk_state *walk_state,
278 u8 * aml_op_start, union acpi_parse_object **new_op)
279 {
280 acpi_status status = AE_OK;
281 union acpi_parse_object *op;
282 union acpi_parse_object *named_op = NULL;
283
284 ACPI_FUNCTION_TRACE_PTR(ps_create_op, walk_state);
285
286 status = acpi_ps_get_aml_opcode(walk_state);
287 if (status == AE_CTRL_PARSE_CONTINUE) {
288 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
289 }
290
291 /* Create Op structure and append to parent's argument list */
292
293 walk_state->op_info = acpi_ps_get_opcode_info(walk_state->opcode);
294 op = acpi_ps_alloc_op(walk_state->opcode);
295 if (!op) {
296 return_ACPI_STATUS(AE_NO_MEMORY);
297 }
298
299 if (walk_state->op_info->flags & AML_NAMED) {
300 status =
301 acpi_ps_build_named_op(walk_state, aml_op_start, op,
302 &named_op);
303 acpi_ps_free_op(op);
304 if (ACPI_FAILURE(status)) {
305 return_ACPI_STATUS(status);
306 }
307
308 *new_op = named_op;
309 return_ACPI_STATUS(AE_OK);
310 }
311
312 /* Not a named opcode, just allocate Op and append to parent */
313
314 if (walk_state->op_info->flags & AML_CREATE) {
315 /*
316 * Backup to beginning of create_xXXfield declaration
317 * body_length is unknown until we parse the body
318 */
319 op->named.data = aml_op_start;
320 op->named.length = 0;
321 }
322
323 acpi_ps_append_arg(acpi_ps_get_parent_scope
324 (&(walk_state->parser_state)), op);
325
326 if (walk_state->descending_callback != NULL) {
327 /*
328 * Find the object. This will either insert the object into
329 * the namespace or simply look it up
330 */
331 walk_state->op = *new_op = op;
332
333 status = walk_state->descending_callback(walk_state, &op);
334 status = acpi_ps_next_parse_state(walk_state, op, status);
335 if (status == AE_CTRL_PENDING) {
336 status = AE_CTRL_PARSE_PENDING;
337 }
338 }
339
340 return_ACPI_STATUS(status);
341 }
342
343 /*******************************************************************************
344 *
345 * FUNCTION: acpi_ps_get_arguments
346 *
347 * PARAMETERS: walk_state - Current state
348 * aml_op_start - Op start in AML
349 * Op - Current Op
350 *
351 * RETURN: Status
352 *
353 * DESCRIPTION: Get arguments for passed Op.
354 *
355 ******************************************************************************/
356
357 static acpi_status
358 acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
359 u8 * aml_op_start, union acpi_parse_object *op)
360 {
361 acpi_status status = AE_OK;
362 union acpi_parse_object *arg = NULL;
363
364 ACPI_FUNCTION_TRACE_PTR(ps_get_arguments, walk_state);
365
366 switch (op->common.aml_opcode) {
367 case AML_BYTE_OP: /* AML_BYTEDATA_ARG */
368 case AML_WORD_OP: /* AML_WORDDATA_ARG */
369 case AML_DWORD_OP: /* AML_DWORDATA_ARG */
370 case AML_QWORD_OP: /* AML_QWORDATA_ARG */
371 case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */
372
373 /* Fill in constant or string argument directly */
374
375 acpi_ps_get_next_simple_arg(&(walk_state->parser_state),
376 GET_CURRENT_ARG_TYPE(walk_state->
377 arg_types),
378 op);
379 break;
380
381 case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */
382
383 status =
384 acpi_ps_get_next_namepath(walk_state,
385 &(walk_state->parser_state), op,
386 1);
387 if (ACPI_FAILURE(status)) {
388 return_ACPI_STATUS(status);
389 }
390
391 walk_state->arg_types = 0;
392 break;
393
394 default:
395 /*
396 * Op is not a constant or string, append each argument to the Op
397 */
398 while (GET_CURRENT_ARG_TYPE(walk_state->arg_types)
399 && !walk_state->arg_count) {
400 walk_state->aml_offset =
401 (u32) ACPI_PTR_DIFF(walk_state->parser_state.aml,
402 walk_state->parser_state.
403 aml_start);
404
405 status =
406 acpi_ps_get_next_arg(walk_state,
407 &(walk_state->parser_state),
408 GET_CURRENT_ARG_TYPE
409 (walk_state->arg_types), &arg);
410 if (ACPI_FAILURE(status)) {
411 return_ACPI_STATUS(status);
412 }
413
414 if (arg) {
415 arg->common.aml_offset = walk_state->aml_offset;
416 acpi_ps_append_arg(op, arg);
417 }
418
419 INCREMENT_ARG_LIST(walk_state->arg_types);
420 }
421
422 /* Special processing for certain opcodes */
423
424 /* TBD (remove): Temporary mechanism to disable this code if needed */
425
426 #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
427
428 if ((walk_state->pass_number <= ACPI_IMODE_LOAD_PASS1) &&
429 ((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) == 0)) {
430 /*
431 * We want to skip If/Else/While constructs during Pass1 because we
432 * want to actually conditionally execute the code during Pass2.
433 *
434 * Except for disassembly, where we always want to walk the
435 * If/Else/While packages
436 */
437 switch (op->common.aml_opcode) {
438 case AML_IF_OP:
439 case AML_ELSE_OP:
440 case AML_WHILE_OP:
441
442 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
443 "Pass1: Skipping an If/Else/While body\n"));
444
445 /* Skip body of if/else/while in pass 1 */
446
447 walk_state->parser_state.aml =
448 walk_state->parser_state.pkg_end;
449 walk_state->arg_count = 0;
450 break;
451
452 default:
453 break;
454 }
455 }
456 #endif
457
458 switch (op->common.aml_opcode) {
459 case AML_METHOD_OP:
460 /*
461 * Skip parsing of control method because we don't have enough
462 * info in the first pass to parse it correctly.
463 *
464 * Save the length and address of the body
465 */
466 op->named.data = walk_state->parser_state.aml;
467 op->named.length = (u32)
468 (walk_state->parser_state.pkg_end -
469 walk_state->parser_state.aml);
470
471 /* Skip body of method */
472
473 walk_state->parser_state.aml =
474 walk_state->parser_state.pkg_end;
475 walk_state->arg_count = 0;
476 break;
477
478 case AML_BUFFER_OP:
479 case AML_PACKAGE_OP:
480 case AML_VAR_PACKAGE_OP:
481
482 if ((op->common.parent) &&
483 (op->common.parent->common.aml_opcode ==
484 AML_NAME_OP)
485 && (walk_state->pass_number <=
486 ACPI_IMODE_LOAD_PASS2)) {
487 /*
488 * Skip parsing of Buffers and Packages because we don't have
489 * enough info in the first pass to parse them correctly.
490 */
491 op->named.data = aml_op_start;
492 op->named.length = (u32)
493 (walk_state->parser_state.pkg_end -
494 aml_op_start);
495
496 /* Skip body */
497
498 walk_state->parser_state.aml =
499 walk_state->parser_state.pkg_end;
500 walk_state->arg_count = 0;
501 }
502 break;
503
504 case AML_WHILE_OP:
505
506 if (walk_state->control_state) {
507 walk_state->control_state->control.package_end =
508 walk_state->parser_state.pkg_end;
509 }
510 break;
511
512 default:
513
514 /* No action for all other opcodes */
515 break;
516 }
517
518 break;
519 }
520
521 return_ACPI_STATUS(AE_OK);
522 }
523
524 /*******************************************************************************
525 *
526 * FUNCTION: acpi_ps_complete_op
527 *
528 * PARAMETERS: walk_state - Current state
529 * Op - Returned Op
530 * Status - Parse status before complete Op
531 *
532 * RETURN: Status
533 *
534 * DESCRIPTION: Complete Op
535 *
536 ******************************************************************************/
537
538 static acpi_status
539 acpi_ps_complete_op(struct acpi_walk_state *walk_state,
540 union acpi_parse_object **op, acpi_status status)
541 {
542 acpi_status status2;
543
544 ACPI_FUNCTION_TRACE_PTR(ps_complete_op, walk_state);
545
546 /*
547 * Finished one argument of the containing scope
548 */
549 walk_state->parser_state.scope->parse_scope.arg_count--;
550
551 /* Close this Op (will result in parse subtree deletion) */
552
553 status2 = acpi_ps_complete_this_op(walk_state, *op);
554 if (ACPI_FAILURE(status2)) {
555 return_ACPI_STATUS(status2);
556 }
557
558 *op = NULL;
559
560 switch (status) {
561 case AE_OK:
562 break;
563
564 case AE_CTRL_TRANSFER:
565
566 /* We are about to transfer to a called method */
567
568 walk_state->prev_op = NULL;
569 walk_state->prev_arg_types = walk_state->arg_types;
570 return_ACPI_STATUS(status);
571
572 case AE_CTRL_END:
573
574 acpi_ps_pop_scope(&(walk_state->parser_state), op,
575 &walk_state->arg_types,
576 &walk_state->arg_count);
577
578 if (*op) {
579 walk_state->op = *op;
580 walk_state->op_info =
581 acpi_ps_get_opcode_info((*op)->common.aml_opcode);
582 walk_state->opcode = (*op)->common.aml_opcode;
583
584 status = walk_state->ascending_callback(walk_state);
585 status =
586 acpi_ps_next_parse_state(walk_state, *op, status);
587
588 status2 = acpi_ps_complete_this_op(walk_state, *op);
589 if (ACPI_FAILURE(status2)) {
590 return_ACPI_STATUS(status2);
591 }
592 }
593
594 status = AE_OK;
595 break;
596
597 case AE_CTRL_BREAK:
598 case AE_CTRL_CONTINUE:
599
600 /* Pop off scopes until we find the While */
601
602 while (!(*op) || ((*op)->common.aml_opcode != AML_WHILE_OP)) {
603 acpi_ps_pop_scope(&(walk_state->parser_state), op,
604 &walk_state->arg_types,
605 &walk_state->arg_count);
606
607 if ((*op)->common.aml_opcode != AML_WHILE_OP) {
608 status2 = acpi_ds_result_stack_pop(walk_state);
609 if (ACPI_FAILURE(status2)) {
610 return_ACPI_STATUS(status2);
611 }
612 }
613 }
614
615 /* Close this iteration of the While loop */
616
617 walk_state->op = *op;
618 walk_state->op_info =
619 acpi_ps_get_opcode_info((*op)->common.aml_opcode);
620 walk_state->opcode = (*op)->common.aml_opcode;
621
622 status = walk_state->ascending_callback(walk_state);
623 status = acpi_ps_next_parse_state(walk_state, *op, status);
624
625 status2 = acpi_ps_complete_this_op(walk_state, *op);
626 if (ACPI_FAILURE(status2)) {
627 return_ACPI_STATUS(status2);
628 }
629
630 status = AE_OK;
631 break;
632
633 case AE_CTRL_TERMINATE:
634
635 /* Clean up */
636 do {
637 if (*op) {
638 status2 =
639 acpi_ps_complete_this_op(walk_state, *op);
640 if (ACPI_FAILURE(status2)) {
641 return_ACPI_STATUS(status2);
642 }
643 status2 = acpi_ds_result_stack_pop(walk_state);
644 if (ACPI_FAILURE(status2)) {
645 return_ACPI_STATUS(status2);
646 }
647
648 acpi_ut_delete_generic_state
649 (acpi_ut_pop_generic_state
650 (&walk_state->control_state));
651 }
652
653 acpi_ps_pop_scope(&(walk_state->parser_state), op,
654 &walk_state->arg_types,
655 &walk_state->arg_count);
656
657 } while (*op);
658
659 return_ACPI_STATUS(AE_OK);
660
661 default: /* All other non-AE_OK status */
662
663 do {
664 if (*op) {
665 status2 =
666 acpi_ps_complete_this_op(walk_state, *op);
667 if (ACPI_FAILURE(status2)) {
668 return_ACPI_STATUS(status2);
669 }
670 }
671
672 acpi_ps_pop_scope(&(walk_state->parser_state), op,
673 &walk_state->arg_types,
674 &walk_state->arg_count);
675
676 } while (*op);
677
678 #if 0
679 /*
680 * TBD: Cleanup parse ops on error
681 */
682 if (*op == NULL) {
683 acpi_ps_pop_scope(parser_state, op,
684 &walk_state->arg_types,
685 &walk_state->arg_count);
686 }
687 #endif
688 walk_state->prev_op = NULL;
689 walk_state->prev_arg_types = walk_state->arg_types;
690 return_ACPI_STATUS(status);
691 }
692
693 /* This scope complete? */
694
695 if (acpi_ps_has_completed_scope(&(walk_state->parser_state))) {
696 acpi_ps_pop_scope(&(walk_state->parser_state), op,
697 &walk_state->arg_types,
698 &walk_state->arg_count);
699 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Popped scope, Op=%p\n", *op));
700 } else {
701 *op = NULL;
702 }
703
704 return_ACPI_STATUS(AE_OK);
705 }
706
707 /*******************************************************************************
708 *
709 * FUNCTION: acpi_ps_complete_final_op
710 *
711 * PARAMETERS: walk_state - Current state
712 * Op - Current Op
713 * Status - Current parse status before complete last
714 * Op
715 *
716 * RETURN: Status
717 *
718 * DESCRIPTION: Complete last Op.
719 *
720 ******************************************************************************/
721
722 static acpi_status
723 acpi_ps_complete_final_op(struct acpi_walk_state *walk_state,
724 union acpi_parse_object *op, acpi_status status)
725 {
726 acpi_status status2;
727
728 ACPI_FUNCTION_TRACE_PTR(ps_complete_final_op, walk_state);
729
730 /*
731 * Complete the last Op (if not completed), and clear the scope stack.
732 * It is easily possible to end an AML "package" with an unbounded number
733 * of open scopes (such as when several ASL blocks are closed with
734 * sequential closing braces). We want to terminate each one cleanly.
735 */
736 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "AML package complete at Op %p\n",
737 op));
738 do {
739 if (op) {
740 if (walk_state->ascending_callback != NULL) {
741 walk_state->op = op;
742 walk_state->op_info =
743 acpi_ps_get_opcode_info(op->common.
744 aml_opcode);
745 walk_state->opcode = op->common.aml_opcode;
746
747 status =
748 walk_state->ascending_callback(walk_state);
749 status =
750 acpi_ps_next_parse_state(walk_state, op,
751 status);
752 if (status == AE_CTRL_PENDING) {
753 status =
754 acpi_ps_complete_op(walk_state, &op,
755 AE_OK);
756 if (ACPI_FAILURE(status)) {
757 return_ACPI_STATUS(status);
758 }
759 }
760
761 if (status == AE_CTRL_TERMINATE) {
762 status = AE_OK;
763
764 /* Clean up */
765 do {
766 if (op) {
767 status2 =
768 acpi_ps_complete_this_op
769 (walk_state, op);
770 if (ACPI_FAILURE
771 (status2)) {
772 return_ACPI_STATUS
773 (status2);
774 }
775 }
776
777 acpi_ps_pop_scope(&
778 (walk_state->
779 parser_state),
780 &op,
781 &walk_state->
782 arg_types,
783 &walk_state->
784 arg_count);
785
786 } while (op);
787
788 return_ACPI_STATUS(status);
789 }
790
791 else if (ACPI_FAILURE(status)) {
792
793 /* First error is most important */
794
795 (void)
796 acpi_ps_complete_this_op(walk_state,
797 op);
798 return_ACPI_STATUS(status);
799 }
800 }
801
802 status2 = acpi_ps_complete_this_op(walk_state, op);
803 if (ACPI_FAILURE(status2)) {
804 return_ACPI_STATUS(status2);
805 }
806 }
807
808 acpi_ps_pop_scope(&(walk_state->parser_state), &op,
809 &walk_state->arg_types,
810 &walk_state->arg_count);
811
812 } while (op);
813
814 return_ACPI_STATUS(status);
815 }
816
817 /*******************************************************************************
818 *
819 * FUNCTION: acpi_ps_parse_loop
820 *
821 * PARAMETERS: walk_state - Current state
822 *
823 * RETURN: Status
824 *
825 * DESCRIPTION: Parse AML (pointed to by the current parser state) and return
826 * a tree of ops.
827 *
828 ******************************************************************************/
829
830 acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state)
831 {
832 acpi_status status = AE_OK;
833 union acpi_parse_object *op = NULL; /* current op */
834 struct acpi_parse_state *parser_state;
835 u8 *aml_op_start = NULL;
836
837 ACPI_FUNCTION_TRACE_PTR(ps_parse_loop, walk_state);
838
839 if (walk_state->descending_callback == NULL) {
840 return_ACPI_STATUS(AE_BAD_PARAMETER);
841 }
842
843 parser_state = &walk_state->parser_state;
844 walk_state->arg_types = 0;
845
846 #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
847
848 if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) {
849
850 /* We are restarting a preempted control method */
851
852 if (acpi_ps_has_completed_scope(parser_state)) {
853 /*
854 * We must check if a predicate to an IF or WHILE statement
855 * was just completed
856 */
857 if ((parser_state->scope->parse_scope.op) &&
858 ((parser_state->scope->parse_scope.op->common.
859 aml_opcode == AML_IF_OP)
860 || (parser_state->scope->parse_scope.op->common.
861 aml_opcode == AML_WHILE_OP))
862 && (walk_state->control_state)
863 && (walk_state->control_state->common.state ==
864 ACPI_CONTROL_PREDICATE_EXECUTING)) {
865 /*
866 * A predicate was just completed, get the value of the
867 * predicate and branch based on that value
868 */
869 walk_state->op = NULL;
870 status =
871 acpi_ds_get_predicate_value(walk_state,
872 ACPI_TO_POINTER
873 (TRUE));
874 if (ACPI_FAILURE(status)
875 && ((status & AE_CODE_MASK) !=
876 AE_CODE_CONTROL)) {
877 if (status == AE_AML_NO_RETURN_VALUE) {
878 ACPI_EXCEPTION((AE_INFO, status,
879 "Invoked method did not return a value"));
880
881 }
882
883 ACPI_EXCEPTION((AE_INFO, status,
884 "GetPredicate Failed"));
885 return_ACPI_STATUS(status);
886 }
887
888 status =
889 acpi_ps_next_parse_state(walk_state, op,
890 status);
891 }
892
893 acpi_ps_pop_scope(parser_state, &op,
894 &walk_state->arg_types,
895 &walk_state->arg_count);
896 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
897 "Popped scope, Op=%p\n", op));
898 } else if (walk_state->prev_op) {
899
900 /* We were in the middle of an op */
901
902 op = walk_state->prev_op;
903 walk_state->arg_types = walk_state->prev_arg_types;
904 }
905 }
906 #endif
907
908 /* Iterative parsing loop, while there is more AML to process: */
909
910 while ((parser_state->aml < parser_state->aml_end) || (op)) {
911 aml_op_start = parser_state->aml;
912 if (!op) {
913 status =
914 acpi_ps_create_op(walk_state, aml_op_start, &op);
915 if (ACPI_FAILURE(status)) {
916 if (status == AE_CTRL_PARSE_CONTINUE) {
917 continue;
918 }
919
920 if (status == AE_CTRL_PARSE_PENDING) {
921 status = AE_OK;
922 }
923
924 status =
925 acpi_ps_complete_op(walk_state, &op,
926 status);
927 if (ACPI_FAILURE(status)) {
928 return_ACPI_STATUS(status);
929 }
930
931 continue;
932 }
933
934 op->common.aml_offset = walk_state->aml_offset;
935
936 if (walk_state->op_info) {
937 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
938 "Opcode %4.4X [%s] Op %p Aml %p AmlOffset %5.5X\n",
939 (u32) op->common.aml_opcode,
940 walk_state->op_info->name, op,
941 parser_state->aml,
942 op->common.aml_offset));
943 }
944 }
945
946 /*
947 * Start arg_count at zero because we don't know if there are
948 * any args yet
949 */
950 walk_state->arg_count = 0;
951
952 /* Are there any arguments that must be processed? */
953
954 if (walk_state->arg_types) {
955
956 /* Get arguments */
957
958 status =
959 acpi_ps_get_arguments(walk_state, aml_op_start, op);
960 if (ACPI_FAILURE(status)) {
961 status =
962 acpi_ps_complete_op(walk_state, &op,
963 status);
964 if (ACPI_FAILURE(status)) {
965 return_ACPI_STATUS(status);
966 }
967
968 continue;
969 }
970 }
971
972 /* Check for arguments that need to be processed */
973
974 if (walk_state->arg_count) {
975 /*
976 * There are arguments (complex ones), push Op and
977 * prepare for argument
978 */
979 status = acpi_ps_push_scope(parser_state, op,
980 walk_state->arg_types,
981 walk_state->arg_count);
982 if (ACPI_FAILURE(status)) {
983 status =
984 acpi_ps_complete_op(walk_state, &op,
985 status);
986 if (ACPI_FAILURE(status)) {
987 return_ACPI_STATUS(status);
988 }
989
990 continue;
991 }
992
993 op = NULL;
994 continue;
995 }
996
997 /*
998 * All arguments have been processed -- Op is complete,
999 * prepare for next
1000 */
1001 walk_state->op_info =
1002 acpi_ps_get_opcode_info(op->common.aml_opcode);
1003 if (walk_state->op_info->flags & AML_NAMED) {
1004 if (acpi_gbl_depth) {
1005 acpi_gbl_depth--;
1006 }
1007
1008 if (op->common.aml_opcode == AML_REGION_OP) {
1009 /*
1010 * Skip parsing of control method or opregion body,
1011 * because we don't have enough info in the first pass
1012 * to parse them correctly.
1013 *
1014 * Completed parsing an op_region declaration, we now
1015 * know the length.
1016 */
1017 op->named.length =
1018 (u32) (parser_state->aml - op->named.data);
1019 }
1020 }
1021
1022 if (walk_state->op_info->flags & AML_CREATE) {
1023 /*
1024 * Backup to beginning of create_xXXfield declaration (1 for
1025 * Opcode)
1026 *
1027 * body_length is unknown until we parse the body
1028 */
1029 op->named.length =
1030 (u32) (parser_state->aml - op->named.data);
1031 }
1032
1033 /* This op complete, notify the dispatcher */
1034
1035 if (walk_state->ascending_callback != NULL) {
1036 walk_state->op = op;
1037 walk_state->opcode = op->common.aml_opcode;
1038
1039 status = walk_state->ascending_callback(walk_state);
1040 status =
1041 acpi_ps_next_parse_state(walk_state, op, status);
1042 if (status == AE_CTRL_PENDING) {
1043 status = AE_OK;
1044 }
1045 }
1046
1047 status = acpi_ps_complete_op(walk_state, &op, status);
1048 if (ACPI_FAILURE(status)) {
1049 return_ACPI_STATUS(status);
1050 }
1051
1052 } /* while parser_state->Aml */
1053
1054 status = acpi_ps_complete_final_op(walk_state, op, status);
1055 return_ACPI_STATUS(status);
1056 }
WRT350N Kernel Patches