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ACPICA: Implemented full argument resolution support for the BankValue argument to...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / acpi / parser / psloop.c
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 if (walk_state->opcode == AML_BANK_FIELD_OP) {
329 /*
330 * Backup to beginning of bank_field declaration
331 * body_length is unknown until we parse the body
332 */
333 op->named.data = aml_op_start;
334 op->named.length = 0;
335 }
336
337 parent_scope = acpi_ps_get_parent_scope(&(walk_state->parser_state));
338 acpi_ps_append_arg(parent_scope, op);
339
340 if (parent_scope) {
341 op_info =
342 acpi_ps_get_opcode_info(parent_scope->common.aml_opcode);
343 if (op_info->flags & AML_HAS_TARGET) {
344 argument_count =
345 acpi_ps_get_argument_count(op_info->type);
346 if (parent_scope->common.arg_list_length >
347 argument_count) {
348 op->common.flags |= ACPI_PARSEOP_TARGET;
349 }
350 } else if (parent_scope->common.aml_opcode == AML_INCREMENT_OP) {
351 op->common.flags |= ACPI_PARSEOP_TARGET;
352 }
353 }
354
355 if (walk_state->descending_callback != NULL) {
356 /*
357 * Find the object. This will either insert the object into
358 * the namespace or simply look it up
359 */
360 walk_state->op = *new_op = op;
361
362 status = walk_state->descending_callback(walk_state, &op);
363 status = acpi_ps_next_parse_state(walk_state, op, status);
364 if (status == AE_CTRL_PENDING) {
365 status = AE_CTRL_PARSE_PENDING;
366 }
367 }
368
369 return_ACPI_STATUS(status);
370 }
371
372 /*******************************************************************************
373 *
374 * FUNCTION: acpi_ps_get_arguments
375 *
376 * PARAMETERS: walk_state - Current state
377 * aml_op_start - Op start in AML
378 * Op - Current Op
379 *
380 * RETURN: Status
381 *
382 * DESCRIPTION: Get arguments for passed Op.
383 *
384 ******************************************************************************/
385
386 static acpi_status
387 acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
388 u8 * aml_op_start, union acpi_parse_object *op)
389 {
390 acpi_status status = AE_OK;
391 union acpi_parse_object *arg = NULL;
392
393 ACPI_FUNCTION_TRACE_PTR(ps_get_arguments, walk_state);
394
395 switch (op->common.aml_opcode) {
396 case AML_BYTE_OP: /* AML_BYTEDATA_ARG */
397 case AML_WORD_OP: /* AML_WORDDATA_ARG */
398 case AML_DWORD_OP: /* AML_DWORDATA_ARG */
399 case AML_QWORD_OP: /* AML_QWORDATA_ARG */
400 case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */
401
402 /* Fill in constant or string argument directly */
403
404 acpi_ps_get_next_simple_arg(&(walk_state->parser_state),
405 GET_CURRENT_ARG_TYPE(walk_state->
406 arg_types),
407 op);
408 break;
409
410 case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */
411
412 status =
413 acpi_ps_get_next_namepath(walk_state,
414 &(walk_state->parser_state), op,
415 1);
416 if (ACPI_FAILURE(status)) {
417 return_ACPI_STATUS(status);
418 }
419
420 walk_state->arg_types = 0;
421 break;
422
423 default:
424 /*
425 * Op is not a constant or string, append each argument to the Op
426 */
427 while (GET_CURRENT_ARG_TYPE(walk_state->arg_types)
428 && !walk_state->arg_count) {
429 walk_state->aml_offset =
430 (u32) ACPI_PTR_DIFF(walk_state->parser_state.aml,
431 walk_state->parser_state.
432 aml_start);
433
434 status =
435 acpi_ps_get_next_arg(walk_state,
436 &(walk_state->parser_state),
437 GET_CURRENT_ARG_TYPE
438 (walk_state->arg_types), &arg);
439 if (ACPI_FAILURE(status)) {
440 return_ACPI_STATUS(status);
441 }
442
443 if (arg) {
444 arg->common.aml_offset = walk_state->aml_offset;
445 acpi_ps_append_arg(op, arg);
446 }
447
448 INCREMENT_ARG_LIST(walk_state->arg_types);
449 }
450
451 /* Special processing for certain opcodes */
452
453 /* TBD (remove): Temporary mechanism to disable this code if needed */
454
455 #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
456
457 if ((walk_state->pass_number <= ACPI_IMODE_LOAD_PASS1) &&
458 ((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) == 0)) {
459 /*
460 * We want to skip If/Else/While constructs during Pass1 because we
461 * want to actually conditionally execute the code during Pass2.
462 *
463 * Except for disassembly, where we always want to walk the
464 * If/Else/While packages
465 */
466 switch (op->common.aml_opcode) {
467 case AML_IF_OP:
468 case AML_ELSE_OP:
469 case AML_WHILE_OP:
470
471 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
472 "Pass1: Skipping an If/Else/While body\n"));
473
474 /* Skip body of if/else/while in pass 1 */
475
476 walk_state->parser_state.aml =
477 walk_state->parser_state.pkg_end;
478 walk_state->arg_count = 0;
479 break;
480
481 default:
482 break;
483 }
484 }
485 #endif
486
487 switch (op->common.aml_opcode) {
488 case AML_METHOD_OP:
489 /*
490 * Skip parsing of control method because we don't have enough
491 * info in the first pass to parse it correctly.
492 *
493 * Save the length and address of the body
494 */
495 op->named.data = walk_state->parser_state.aml;
496 op->named.length = (u32)
497 (walk_state->parser_state.pkg_end -
498 walk_state->parser_state.aml);
499
500 /* Skip body of method */
501
502 walk_state->parser_state.aml =
503 walk_state->parser_state.pkg_end;
504 walk_state->arg_count = 0;
505 break;
506
507 case AML_BUFFER_OP:
508 case AML_PACKAGE_OP:
509 case AML_VAR_PACKAGE_OP:
510
511 if ((op->common.parent) &&
512 (op->common.parent->common.aml_opcode ==
513 AML_NAME_OP)
514 && (walk_state->pass_number <=
515 ACPI_IMODE_LOAD_PASS2)) {
516 /*
517 * Skip parsing of Buffers and Packages because we don't have
518 * enough info in the first pass to parse them correctly.
519 */
520 op->named.data = aml_op_start;
521 op->named.length = (u32)
522 (walk_state->parser_state.pkg_end -
523 aml_op_start);
524
525 /* Skip body */
526
527 walk_state->parser_state.aml =
528 walk_state->parser_state.pkg_end;
529 walk_state->arg_count = 0;
530 }
531 break;
532
533 case AML_WHILE_OP:
534
535 if (walk_state->control_state) {
536 walk_state->control_state->control.package_end =
537 walk_state->parser_state.pkg_end;
538 }
539 break;
540
541 default:
542
543 /* No action for all other opcodes */
544 break;
545 }
546
547 break;
548 }
549
550 return_ACPI_STATUS(AE_OK);
551 }
552
553 /*******************************************************************************
554 *
555 * FUNCTION: acpi_ps_complete_op
556 *
557 * PARAMETERS: walk_state - Current state
558 * Op - Returned Op
559 * Status - Parse status before complete Op
560 *
561 * RETURN: Status
562 *
563 * DESCRIPTION: Complete Op
564 *
565 ******************************************************************************/
566
567 static acpi_status
568 acpi_ps_complete_op(struct acpi_walk_state *walk_state,
569 union acpi_parse_object **op, acpi_status status)
570 {
571 acpi_status status2;
572
573 ACPI_FUNCTION_TRACE_PTR(ps_complete_op, walk_state);
574
575 /*
576 * Finished one argument of the containing scope
577 */
578 walk_state->parser_state.scope->parse_scope.arg_count--;
579
580 /* Close this Op (will result in parse subtree deletion) */
581
582 status2 = acpi_ps_complete_this_op(walk_state, *op);
583 if (ACPI_FAILURE(status2)) {
584 return_ACPI_STATUS(status2);
585 }
586
587 *op = NULL;
588
589 switch (status) {
590 case AE_OK:
591 break;
592
593 case AE_CTRL_TRANSFER:
594
595 /* We are about to transfer to a called method */
596
597 walk_state->prev_op = NULL;
598 walk_state->prev_arg_types = walk_state->arg_types;
599 return_ACPI_STATUS(status);
600
601 case AE_CTRL_END:
602
603 acpi_ps_pop_scope(&(walk_state->parser_state), op,
604 &walk_state->arg_types,
605 &walk_state->arg_count);
606
607 if (*op) {
608 walk_state->op = *op;
609 walk_state->op_info =
610 acpi_ps_get_opcode_info((*op)->common.aml_opcode);
611 walk_state->opcode = (*op)->common.aml_opcode;
612
613 status = walk_state->ascending_callback(walk_state);
614 status =
615 acpi_ps_next_parse_state(walk_state, *op, status);
616
617 status2 = acpi_ps_complete_this_op(walk_state, *op);
618 if (ACPI_FAILURE(status2)) {
619 return_ACPI_STATUS(status2);
620 }
621 }
622
623 status = AE_OK;
624 break;
625
626 case AE_CTRL_BREAK:
627 case AE_CTRL_CONTINUE:
628
629 /* Pop off scopes until we find the While */
630
631 while (!(*op) || ((*op)->common.aml_opcode != AML_WHILE_OP)) {
632 acpi_ps_pop_scope(&(walk_state->parser_state), op,
633 &walk_state->arg_types,
634 &walk_state->arg_count);
635 }
636
637 /* Close this iteration of the While loop */
638
639 walk_state->op = *op;
640 walk_state->op_info =
641 acpi_ps_get_opcode_info((*op)->common.aml_opcode);
642 walk_state->opcode = (*op)->common.aml_opcode;
643
644 status = walk_state->ascending_callback(walk_state);
645 status = acpi_ps_next_parse_state(walk_state, *op, status);
646
647 status2 = acpi_ps_complete_this_op(walk_state, *op);
648 if (ACPI_FAILURE(status2)) {
649 return_ACPI_STATUS(status2);
650 }
651
652 status = AE_OK;
653 break;
654
655 case AE_CTRL_TERMINATE:
656
657 /* Clean up */
658 do {
659 if (*op) {
660 status2 =
661 acpi_ps_complete_this_op(walk_state, *op);
662 if (ACPI_FAILURE(status2)) {
663 return_ACPI_STATUS(status2);
664 }
665
666 acpi_ut_delete_generic_state
667 (acpi_ut_pop_generic_state
668 (&walk_state->control_state));
669 }
670
671 acpi_ps_pop_scope(&(walk_state->parser_state), op,
672 &walk_state->arg_types,
673 &walk_state->arg_count);
674
675 } while (*op);
676
677 return_ACPI_STATUS(AE_OK);
678
679 default: /* All other non-AE_OK status */
680
681 do {
682 if (*op) {
683 status2 =
684 acpi_ps_complete_this_op(walk_state, *op);
685 if (ACPI_FAILURE(status2)) {
686 return_ACPI_STATUS(status2);
687 }
688 }
689
690 acpi_ps_pop_scope(&(walk_state->parser_state), op,
691 &walk_state->arg_types,
692 &walk_state->arg_count);
693
694 } while (*op);
695
696 #if 0
697 /*
698 * TBD: Cleanup parse ops on error
699 */
700 if (*op == NULL) {
701 acpi_ps_pop_scope(parser_state, op,
702 &walk_state->arg_types,
703 &walk_state->arg_count);
704 }
705 #endif
706 walk_state->prev_op = NULL;
707 walk_state->prev_arg_types = walk_state->arg_types;
708 return_ACPI_STATUS(status);
709 }
710
711 /* This scope complete? */
712
713 if (acpi_ps_has_completed_scope(&(walk_state->parser_state))) {
714 acpi_ps_pop_scope(&(walk_state->parser_state), op,
715 &walk_state->arg_types,
716 &walk_state->arg_count);
717 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Popped scope, Op=%p\n", *op));
718 } else {
719 *op = NULL;
720 }
721
722 return_ACPI_STATUS(AE_OK);
723 }
724
725 /*******************************************************************************
726 *
727 * FUNCTION: acpi_ps_complete_final_op
728 *
729 * PARAMETERS: walk_state - Current state
730 * Op - Current Op
731 * Status - Current parse status before complete last
732 * Op
733 *
734 * RETURN: Status
735 *
736 * DESCRIPTION: Complete last Op.
737 *
738 ******************************************************************************/
739
740 static acpi_status
741 acpi_ps_complete_final_op(struct acpi_walk_state *walk_state,
742 union acpi_parse_object *op, acpi_status status)
743 {
744 acpi_status status2;
745
746 ACPI_FUNCTION_TRACE_PTR(ps_complete_final_op, walk_state);
747
748 /*
749 * Complete the last Op (if not completed), and clear the scope stack.
750 * It is easily possible to end an AML "package" with an unbounded number
751 * of open scopes (such as when several ASL blocks are closed with
752 * sequential closing braces). We want to terminate each one cleanly.
753 */
754 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "AML package complete at Op %p\n",
755 op));
756 do {
757 if (op) {
758 if (walk_state->ascending_callback != NULL) {
759 walk_state->op = op;
760 walk_state->op_info =
761 acpi_ps_get_opcode_info(op->common.
762 aml_opcode);
763 walk_state->opcode = op->common.aml_opcode;
764
765 status =
766 walk_state->ascending_callback(walk_state);
767 status =
768 acpi_ps_next_parse_state(walk_state, op,
769 status);
770 if (status == AE_CTRL_PENDING) {
771 status =
772 acpi_ps_complete_op(walk_state, &op,
773 AE_OK);
774 if (ACPI_FAILURE(status)) {
775 return_ACPI_STATUS(status);
776 }
777 }
778
779 if (status == AE_CTRL_TERMINATE) {
780 status = AE_OK;
781
782 /* Clean up */
783 do {
784 if (op) {
785 status2 =
786 acpi_ps_complete_this_op
787 (walk_state, op);
788 if (ACPI_FAILURE
789 (status2)) {
790 return_ACPI_STATUS
791 (status2);
792 }
793 }
794
795 acpi_ps_pop_scope(&
796 (walk_state->
797 parser_state),
798 &op,
799 &walk_state->
800 arg_types,
801 &walk_state->
802 arg_count);
803
804 } while (op);
805
806 return_ACPI_STATUS(status);
807 }
808
809 else if (ACPI_FAILURE(status)) {
810
811 /* First error is most important */
812
813 (void)
814 acpi_ps_complete_this_op(walk_state,
815 op);
816 return_ACPI_STATUS(status);
817 }
818 }
819
820 status2 = acpi_ps_complete_this_op(walk_state, op);
821 if (ACPI_FAILURE(status2)) {
822 return_ACPI_STATUS(status2);
823 }
824 }
825
826 acpi_ps_pop_scope(&(walk_state->parser_state), &op,
827 &walk_state->arg_types,
828 &walk_state->arg_count);
829
830 } while (op);
831
832 return_ACPI_STATUS(status);
833 }
834
835 /*******************************************************************************
836 *
837 * FUNCTION: acpi_ps_parse_loop
838 *
839 * PARAMETERS: walk_state - Current state
840 *
841 * RETURN: Status
842 *
843 * DESCRIPTION: Parse AML (pointed to by the current parser state) and return
844 * a tree of ops.
845 *
846 ******************************************************************************/
847
848 acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state)
849 {
850 acpi_status status = AE_OK;
851 union acpi_parse_object *op = NULL; /* current op */
852 struct acpi_parse_state *parser_state;
853 u8 *aml_op_start = NULL;
854
855 ACPI_FUNCTION_TRACE_PTR(ps_parse_loop, walk_state);
856
857 if (walk_state->descending_callback == NULL) {
858 return_ACPI_STATUS(AE_BAD_PARAMETER);
859 }
860
861 parser_state = &walk_state->parser_state;
862 walk_state->arg_types = 0;
863
864 #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
865
866 if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) {
867
868 /* We are restarting a preempted control method */
869
870 if (acpi_ps_has_completed_scope(parser_state)) {
871 /*
872 * We must check if a predicate to an IF or WHILE statement
873 * was just completed
874 */
875 if ((parser_state->scope->parse_scope.op) &&
876 ((parser_state->scope->parse_scope.op->common.
877 aml_opcode == AML_IF_OP)
878 || (parser_state->scope->parse_scope.op->common.
879 aml_opcode == AML_WHILE_OP))
880 && (walk_state->control_state)
881 && (walk_state->control_state->common.state ==
882 ACPI_CONTROL_PREDICATE_EXECUTING)) {
883 /*
884 * A predicate was just completed, get the value of the
885 * predicate and branch based on that value
886 */
887 walk_state->op = NULL;
888 status =
889 acpi_ds_get_predicate_value(walk_state,
890 ACPI_TO_POINTER
891 (TRUE));
892 if (ACPI_FAILURE(status)
893 && ((status & AE_CODE_MASK) !=
894 AE_CODE_CONTROL)) {
895 if (status == AE_AML_NO_RETURN_VALUE) {
896 ACPI_EXCEPTION((AE_INFO, status,
897 "Invoked method did not return a value"));
898
899 }
900
901 ACPI_EXCEPTION((AE_INFO, status,
902 "GetPredicate Failed"));
903 return_ACPI_STATUS(status);
904 }
905
906 status =
907 acpi_ps_next_parse_state(walk_state, op,
908 status);
909 }
910
911 acpi_ps_pop_scope(parser_state, &op,
912 &walk_state->arg_types,
913 &walk_state->arg_count);
914 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
915 "Popped scope, Op=%p\n", op));
916 } else if (walk_state->prev_op) {
917
918 /* We were in the middle of an op */
919
920 op = walk_state->prev_op;
921 walk_state->arg_types = walk_state->prev_arg_types;
922 }
923 }
924 #endif
925
926 /* Iterative parsing loop, while there is more AML to process: */
927
928 while ((parser_state->aml < parser_state->aml_end) || (op)) {
929 aml_op_start = parser_state->aml;
930 if (!op) {
931 status =
932 acpi_ps_create_op(walk_state, aml_op_start, &op);
933 if (ACPI_FAILURE(status)) {
934 if (status == AE_CTRL_PARSE_CONTINUE) {
935 continue;
936 }
937
938 if (status == AE_CTRL_PARSE_PENDING) {
939 status = AE_OK;
940 }
941
942 status =
943 acpi_ps_complete_op(walk_state, &op,
944 status);
945 if (ACPI_FAILURE(status)) {
946 return_ACPI_STATUS(status);
947 }
948
949 continue;
950 }
951
952 op->common.aml_offset = walk_state->aml_offset;
953
954 if (walk_state->op_info) {
955 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
956 "Opcode %4.4X [%s] Op %p Aml %p AmlOffset %5.5X\n",
957 (u32) op->common.aml_opcode,
958 walk_state->op_info->name, op,
959 parser_state->aml,
960 op->common.aml_offset));
961 }
962 }
963
964 /*
965 * Start arg_count at zero because we don't know if there are
966 * any args yet
967 */
968 walk_state->arg_count = 0;
969
970 /* Are there any arguments that must be processed? */
971
972 if (walk_state->arg_types) {
973
974 /* Get arguments */
975
976 status =
977 acpi_ps_get_arguments(walk_state, aml_op_start, op);
978 if (ACPI_FAILURE(status)) {
979 status =
980 acpi_ps_complete_op(walk_state, &op,
981 status);
982 if (ACPI_FAILURE(status)) {
983 return_ACPI_STATUS(status);
984 }
985
986 continue;
987 }
988 }
989
990 /* Check for arguments that need to be processed */
991
992 if (walk_state->arg_count) {
993 /*
994 * There are arguments (complex ones), push Op and
995 * prepare for argument
996 */
997 status = acpi_ps_push_scope(parser_state, op,
998 walk_state->arg_types,
999 walk_state->arg_count);
1000 if (ACPI_FAILURE(status)) {
1001 status =
1002 acpi_ps_complete_op(walk_state, &op,
1003 status);
1004 if (ACPI_FAILURE(status)) {
1005 return_ACPI_STATUS(status);
1006 }
1007
1008 continue;
1009 }
1010
1011 op = NULL;
1012 continue;
1013 }
1014
1015 /*
1016 * All arguments have been processed -- Op is complete,
1017 * prepare for next
1018 */
1019 walk_state->op_info =
1020 acpi_ps_get_opcode_info(op->common.aml_opcode);
1021 if (walk_state->op_info->flags & AML_NAMED) {
1022 if (acpi_gbl_depth) {
1023 acpi_gbl_depth--;
1024 }
1025
1026 if (op->common.aml_opcode == AML_REGION_OP ||
1027 op->common.aml_opcode == AML_DATA_REGION_OP) {
1028 /*
1029 * Skip parsing of control method or opregion body,
1030 * because we don't have enough info in the first pass
1031 * to parse them correctly.
1032 *
1033 * Completed parsing an op_region declaration, we now
1034 * know the length.
1035 */
1036 op->named.length =
1037 (u32) (parser_state->aml - op->named.data);
1038 }
1039 }
1040
1041 if (walk_state->op_info->flags & AML_CREATE) {
1042 /*
1043 * Backup to beginning of create_xXXfield declaration (1 for
1044 * Opcode)
1045 *
1046 * body_length is unknown until we parse the body
1047 */
1048 op->named.length =
1049 (u32) (parser_state->aml - op->named.data);
1050 }
1051
1052 if (op->common.aml_opcode == AML_BANK_FIELD_OP) {
1053 /*
1054 * Backup to beginning of bank_field declaration
1055 *
1056 * body_length is unknown until we parse the body
1057 */
1058 op->named.length =
1059 (u32) (parser_state->aml - op->named.data);
1060 }
1061
1062 /* This op complete, notify the dispatcher */
1063
1064 if (walk_state->ascending_callback != NULL) {
1065 walk_state->op = op;
1066 walk_state->opcode = op->common.aml_opcode;
1067
1068 status = walk_state->ascending_callback(walk_state);
1069 status =
1070 acpi_ps_next_parse_state(walk_state, op, status);
1071 if (status == AE_CTRL_PENDING) {
1072 status = AE_OK;
1073 }
1074 }
1075
1076 status = acpi_ps_complete_op(walk_state, &op, status);
1077 if (ACPI_FAILURE(status)) {
1078 return_ACPI_STATUS(status);
1079 }
1080
1081 } /* while parser_state->Aml */
1082
1083 status = acpi_ps_complete_final_op(walk_state, op, status);
1084 return_ACPI_STATUS(status);
1085 }
kernel source for telekom puls (alcatel/mediatek)