?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
staging: agnx, remove memlens from probe
[linux-2.6/mini2440.git] / drivers / acpi / acpica / psloop.c
blobc5f6ce19a4019ae87c683f07cc0fbc1ee3b4563d
1 /******************************************************************************
2 *
3 * Module Name: psloop - Main AML parse loop
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2008, Intel Corp.
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 "accommon.h"
54 #include "acparser.h"
55 #include "acdispat.h"
56 #include "amlcode.h"
57
58 #define _COMPONENT ACPI_PARSER
59 ACPI_MODULE_NAME("psloop")
60
61 static u32 acpi_gbl_depth = 0;
62
63 /* Local prototypes */
64
65 static acpi_status acpi_ps_get_aml_opcode(struct acpi_walk_state *walk_state);
66
67 static acpi_status
68 acpi_ps_build_named_op(struct acpi_walk_state *walk_state,
69 u8 * aml_op_start,
70 union acpi_parse_object *unnamed_op,
71 union acpi_parse_object **op);
72
73 static acpi_status
74 acpi_ps_create_op(struct acpi_walk_state *walk_state,
75 u8 * aml_op_start, union acpi_parse_object **new_op);
76
77 static acpi_status
78 acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
79 u8 * aml_op_start, union acpi_parse_object *op);
80
81 static acpi_status
82 acpi_ps_complete_op(struct acpi_walk_state *walk_state,
83 union acpi_parse_object **op, acpi_status status);
84
85 static acpi_status
86 acpi_ps_complete_final_op(struct acpi_walk_state *walk_state,
87 union acpi_parse_object *op, acpi_status status);
88
89 /*******************************************************************************
90 *
91 * FUNCTION: acpi_ps_get_aml_opcode
92 *
93 * PARAMETERS: walk_state - Current state
94 *
95 * RETURN: Status
96 *
97 * DESCRIPTION: Extract the next AML opcode from the input stream.
98 *
99 ******************************************************************************/
100
101 static acpi_status acpi_ps_get_aml_opcode(struct acpi_walk_state *walk_state)
102 {
103
104 ACPI_FUNCTION_TRACE_PTR(ps_get_aml_opcode, walk_state);
105
106 walk_state->aml_offset =
107 (u32) ACPI_PTR_DIFF(walk_state->parser_state.aml,
108 walk_state->parser_state.aml_start);
109 walk_state->opcode = acpi_ps_peek_opcode(&(walk_state->parser_state));
110
111 /*
112 * First cut to determine what we have found:
113 * 1) A valid AML opcode
114 * 2) A name string
115 * 3) An unknown/invalid opcode
116 */
117 walk_state->op_info = acpi_ps_get_opcode_info(walk_state->opcode);
118
119 switch (walk_state->op_info->class) {
120 case AML_CLASS_ASCII:
121 case AML_CLASS_PREFIX:
122 /*
123 * Starts with a valid prefix or ASCII char, this is a name
124 * string. Convert the bare name string to a namepath.
125 */
126 walk_state->opcode = AML_INT_NAMEPATH_OP;
127 walk_state->arg_types = ARGP_NAMESTRING;
128 break;
129
130 case AML_CLASS_UNKNOWN:
131
132 /* The opcode is unrecognized. Just skip unknown opcodes */
133
134 ACPI_ERROR((AE_INFO,
135 "Found unknown opcode %X at AML address %p offset %X, ignoring",
136 walk_state->opcode, walk_state->parser_state.aml,
137 walk_state->aml_offset));
138
139 ACPI_DUMP_BUFFER(walk_state->parser_state.aml, 128);
140
141 /* Assume one-byte bad opcode */
142
143 walk_state->parser_state.aml++;
144 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
145
146 default:
147
148 /* Found opcode info, this is a normal opcode */
149
150 walk_state->parser_state.aml +=
151 acpi_ps_get_opcode_size(walk_state->opcode);
152 walk_state->arg_types = walk_state->op_info->parse_args;
153 break;
154 }
155
156 return_ACPI_STATUS(AE_OK);
157 }
158
159 /*******************************************************************************
160 *
161 * FUNCTION: acpi_ps_build_named_op
162 *
163 * PARAMETERS: walk_state - Current state
164 * aml_op_start - Begin of named Op in AML
165 * unnamed_op - Early Op (not a named Op)
166 * Op - Returned Op
167 *
168 * RETURN: Status
169 *
170 * DESCRIPTION: Parse a named Op
171 *
172 ******************************************************************************/
173
174 static acpi_status
175 acpi_ps_build_named_op(struct acpi_walk_state *walk_state,
176 u8 * aml_op_start,
177 union acpi_parse_object *unnamed_op,
178 union acpi_parse_object **op)
179 {
180 acpi_status status = AE_OK;
181 union acpi_parse_object *arg = NULL;
182
183 ACPI_FUNCTION_TRACE_PTR(ps_build_named_op, walk_state);
184
185 unnamed_op->common.value.arg = NULL;
186 unnamed_op->common.arg_list_length = 0;
187 unnamed_op->common.aml_opcode = walk_state->opcode;
188
189 /*
190 * Get and append arguments until we find the node that contains
191 * the name (the type ARGP_NAME).
192 */
193 while (GET_CURRENT_ARG_TYPE(walk_state->arg_types) &&
194 (GET_CURRENT_ARG_TYPE(walk_state->arg_types) != ARGP_NAME)) {
195 status =
196 acpi_ps_get_next_arg(walk_state,
197 &(walk_state->parser_state),
198 GET_CURRENT_ARG_TYPE(walk_state->
199 arg_types), &arg);
200 if (ACPI_FAILURE(status)) {
201 return_ACPI_STATUS(status);
202 }
203
204 acpi_ps_append_arg(unnamed_op, arg);
205 INCREMENT_ARG_LIST(walk_state->arg_types);
206 }
207
208 /*
209 * Make sure that we found a NAME and didn't run out of arguments
210 */
211 if (!GET_CURRENT_ARG_TYPE(walk_state->arg_types)) {
212 return_ACPI_STATUS(AE_AML_NO_OPERAND);
213 }
214
215 /* We know that this arg is a name, move to next arg */
216
217 INCREMENT_ARG_LIST(walk_state->arg_types);
218
219 /*
220 * Find the object. This will either insert the object into
221 * the namespace or simply look it up
222 */
223 walk_state->op = NULL;
224
225 status = walk_state->descending_callback(walk_state, op);
226 if (ACPI_FAILURE(status)) {
227 ACPI_EXCEPTION((AE_INFO, status, "During name lookup/catalog"));
228 return_ACPI_STATUS(status);
229 }
230
231 if (!*op) {
232 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
233 }
234
235 status = acpi_ps_next_parse_state(walk_state, *op, status);
236 if (ACPI_FAILURE(status)) {
237 if (status == AE_CTRL_PENDING) {
238 return_ACPI_STATUS(AE_CTRL_PARSE_PENDING);
239 }
240 return_ACPI_STATUS(status);
241 }
242
243 acpi_ps_append_arg(*op, unnamed_op->common.value.arg);
244 acpi_gbl_depth++;
245
246 if ((*op)->common.aml_opcode == AML_REGION_OP ||
247 (*op)->common.aml_opcode == AML_DATA_REGION_OP) {
248 /*
249 * Defer final parsing of an operation_region body, because we don't
250 * have enough info in the first pass to parse it correctly (i.e.,
251 * there may be method calls within the term_arg elements of the body.)
252 *
253 * However, we must continue parsing because the opregion is not a
254 * standalone package -- we don't know where the end is at this point.
255 *
256 * (Length is unknown until parse of the body complete)
257 */
258 (*op)->named.data = aml_op_start;
259 (*op)->named.length = 0;
260 }
261
262 return_ACPI_STATUS(AE_OK);
263 }
264
265 /*******************************************************************************
266 *
267 * FUNCTION: acpi_ps_create_op
268 *
269 * PARAMETERS: walk_state - Current state
270 * aml_op_start - Op start in AML
271 * new_op - Returned Op
272 *
273 * RETURN: Status
274 *
275 * DESCRIPTION: Get Op from AML
276 *
277 ******************************************************************************/
278
279 static acpi_status
280 acpi_ps_create_op(struct acpi_walk_state *walk_state,
281 u8 * aml_op_start, union acpi_parse_object **new_op)
282 {
283 acpi_status status = AE_OK;
284 union acpi_parse_object *op;
285 union acpi_parse_object *named_op = NULL;
286 union acpi_parse_object *parent_scope;
287 u8 argument_count;
288 const struct acpi_opcode_info *op_info;
289
290 ACPI_FUNCTION_TRACE_PTR(ps_create_op, walk_state);
291
292 status = acpi_ps_get_aml_opcode(walk_state);
293 if (status == AE_CTRL_PARSE_CONTINUE) {
294 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
295 }
296
297 /* Create Op structure and append to parent's argument list */
298
299 walk_state->op_info = acpi_ps_get_opcode_info(walk_state->opcode);
300 op = acpi_ps_alloc_op(walk_state->opcode);
301 if (!op) {
302 return_ACPI_STATUS(AE_NO_MEMORY);
303 }
304
305 if (walk_state->op_info->flags & AML_NAMED) {
306 status =
307 acpi_ps_build_named_op(walk_state, aml_op_start, op,
308 &named_op);
309 acpi_ps_free_op(op);
310 if (ACPI_FAILURE(status)) {
311 return_ACPI_STATUS(status);
312 }
313
314 *new_op = named_op;
315 return_ACPI_STATUS(AE_OK);
316 }
317
318 /* Not a named opcode, just allocate Op and append to parent */
319
320 if (walk_state->op_info->flags & AML_CREATE) {
321 /*
322 * Backup to beginning of create_xXXfield declaration
323 * body_length is unknown until we parse the body
324 */
325 op->named.data = aml_op_start;
326 op->named.length = 0;
327 }
328
329 if (walk_state->opcode == AML_BANK_FIELD_OP) {
330 /*
331 * Backup to beginning of bank_field declaration
332 * body_length is unknown until we parse the body
333 */
334 op->named.data = aml_op_start;
335 op->named.length = 0;
336 }
337
338 parent_scope = acpi_ps_get_parent_scope(&(walk_state->parser_state));
339 acpi_ps_append_arg(parent_scope, op);
340
341 if (parent_scope) {
342 op_info =
343 acpi_ps_get_opcode_info(parent_scope->common.aml_opcode);
344 if (op_info->flags & AML_HAS_TARGET) {
345 argument_count =
346 acpi_ps_get_argument_count(op_info->type);
347 if (parent_scope->common.arg_list_length >
348 argument_count) {
349 op->common.flags |= ACPI_PARSEOP_TARGET;
350 }
351 } else if (parent_scope->common.aml_opcode == AML_INCREMENT_OP) {
352 op->common.flags |= ACPI_PARSEOP_TARGET;
353 }
354 }
355
356 if (walk_state->descending_callback != NULL) {
357 /*
358 * Find the object. This will either insert the object into
359 * the namespace or simply look it up
360 */
361 walk_state->op = *new_op = op;
362
363 status = walk_state->descending_callback(walk_state, &op);
364 status = acpi_ps_next_parse_state(walk_state, op, status);
365 if (status == AE_CTRL_PENDING) {
366 status = AE_CTRL_PARSE_PENDING;
367 }
368 }
369
370 return_ACPI_STATUS(status);
371 }
372
373 /*******************************************************************************
374 *
375 * FUNCTION: acpi_ps_get_arguments
376 *
377 * PARAMETERS: walk_state - Current state
378 * aml_op_start - Op start in AML
379 * Op - Current Op
380 *
381 * RETURN: Status
382 *
383 * DESCRIPTION: Get arguments for passed Op.
384 *
385 ******************************************************************************/
386
387 static acpi_status
388 acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
389 u8 * aml_op_start, union acpi_parse_object *op)
390 {
391 acpi_status status = AE_OK;
392 union acpi_parse_object *arg = NULL;
393
394 ACPI_FUNCTION_TRACE_PTR(ps_get_arguments, walk_state);
395
396 switch (op->common.aml_opcode) {
397 case AML_BYTE_OP: /* AML_BYTEDATA_ARG */
398 case AML_WORD_OP: /* AML_WORDDATA_ARG */
399 case AML_DWORD_OP: /* AML_DWORDATA_ARG */
400 case AML_QWORD_OP: /* AML_QWORDATA_ARG */
401 case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */
402
403 /* Fill in constant or string argument directly */
404
405 acpi_ps_get_next_simple_arg(&(walk_state->parser_state),
406 GET_CURRENT_ARG_TYPE(walk_state->
407 arg_types),
408 op);
409 break;
410
411 case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */
412
413 status =
414 acpi_ps_get_next_namepath(walk_state,
415 &(walk_state->parser_state), op,
416 1);
417 if (ACPI_FAILURE(status)) {
418 return_ACPI_STATUS(status);
419 }
420
421 walk_state->arg_types = 0;
422 break;
423
424 default:
425 /*
426 * Op is not a constant or string, append each argument to the Op
427 */
428 while (GET_CURRENT_ARG_TYPE(walk_state->arg_types)
429 && !walk_state->arg_count) {
430 walk_state->aml_offset =
431 (u32) ACPI_PTR_DIFF(walk_state->parser_state.aml,
432 walk_state->parser_state.
433 aml_start);
434
435 status =
436 acpi_ps_get_next_arg(walk_state,
437 &(walk_state->parser_state),
438 GET_CURRENT_ARG_TYPE
439 (walk_state->arg_types), &arg);
440 if (ACPI_FAILURE(status)) {
441 return_ACPI_STATUS(status);
442 }
443
444 if (arg) {
445 arg->common.aml_offset = walk_state->aml_offset;
446 acpi_ps_append_arg(op, arg);
447 }
448
449 INCREMENT_ARG_LIST(walk_state->arg_types);
450 }
451
452 /* Special processing for certain opcodes */
453
454 /* TBD (remove): Temporary mechanism to disable this code if needed */
455
456 #ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
457
458 if ((walk_state->pass_number <= ACPI_IMODE_LOAD_PASS1) &&
459 ((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) == 0)) {
460 /*
461 * We want to skip If/Else/While constructs during Pass1 because we
462 * want to actually conditionally execute the code during Pass2.
463 *
464 * Except for disassembly, where we always want to walk the
465 * If/Else/While packages
466 */
467 switch (op->common.aml_opcode) {
468 case AML_IF_OP:
469 case AML_ELSE_OP:
470 case AML_WHILE_OP:
471
472 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
473 "Pass1: Skipping an If/Else/While body\n"));
474
475 /* Skip body of if/else/while in pass 1 */
476
477 walk_state->parser_state.aml =
478 walk_state->parser_state.pkg_end;
479 walk_state->arg_count = 0;
480 break;
481
482 default:
483 break;
484 }
485 }
486 #endif
487
488 switch (op->common.aml_opcode) {
489 case AML_METHOD_OP:
490 /*
491 * Skip parsing of control method because we don't have enough
492 * info in the first pass to parse it correctly.
493 *
494 * Save the length and address of the body
495 */
496 op->named.data = walk_state->parser_state.aml;
497 op->named.length = (u32)
498 (walk_state->parser_state.pkg_end -
499 walk_state->parser_state.aml);
500
501 /* Skip body of method */
502
503 walk_state->parser_state.aml =
504 walk_state->parser_state.pkg_end;
505 walk_state->arg_count = 0;
506 break;
507
508 case AML_BUFFER_OP:
509 case AML_PACKAGE_OP:
510 case AML_VAR_PACKAGE_OP:
511
512 if ((op->common.parent) &&
513 (op->common.parent->common.aml_opcode ==
514 AML_NAME_OP)
515 && (walk_state->pass_number <=
516 ACPI_IMODE_LOAD_PASS2)) {
517 /*
518 * Skip parsing of Buffers and Packages because we don't have
519 * enough info in the first pass to parse them correctly.
520 */
521 op->named.data = aml_op_start;
522 op->named.length = (u32)
523 (walk_state->parser_state.pkg_end -
524 aml_op_start);
525
526 /* Skip body */
527
528 walk_state->parser_state.aml =
529 walk_state->parser_state.pkg_end;
530 walk_state->arg_count = 0;
531 }
532 break;
533
534 case AML_WHILE_OP:
535
536 if (walk_state->control_state) {
537 walk_state->control_state->control.package_end =
538 walk_state->parser_state.pkg_end;
539 }
540 break;
541
542 default:
543
544 /* No action for all other opcodes */
545 break;
546 }
547
548 break;
549 }
550
551 return_ACPI_STATUS(AE_OK);
552 }
553
554 /*******************************************************************************
555 *
556 * FUNCTION: acpi_ps_complete_op
557 *
558 * PARAMETERS: walk_state - Current state
559 * Op - Returned Op
560 * Status - Parse status before complete Op
561 *
562 * RETURN: Status
563 *
564 * DESCRIPTION: Complete Op
565 *
566 ******************************************************************************/
567
568 static acpi_status
569 acpi_ps_complete_op(struct acpi_walk_state *walk_state,
570 union acpi_parse_object **op, acpi_status status)
571 {
572 acpi_status status2;
573
574 ACPI_FUNCTION_TRACE_PTR(ps_complete_op, walk_state);
575
576 /*
577 * Finished one argument of the containing scope
578 */
579 walk_state->parser_state.scope->parse_scope.arg_count--;
580
581 /* Close this Op (will result in parse subtree deletion) */
582
583 status2 = acpi_ps_complete_this_op(walk_state, *op);
584 if (ACPI_FAILURE(status2)) {
585 return_ACPI_STATUS(status2);
586 }
587
588 *op = NULL;
589
590 switch (status) {
591 case AE_OK:
592 break;
593
594 case AE_CTRL_TRANSFER:
595
596 /* We are about to transfer to a called method */
597
598 walk_state->prev_op = NULL;
599 walk_state->prev_arg_types = walk_state->arg_types;
600 return_ACPI_STATUS(status);
601
602 case AE_CTRL_END:
603
604 acpi_ps_pop_scope(&(walk_state->parser_state), op,
605 &walk_state->arg_types,
606 &walk_state->arg_count);
607
608 if (*op) {
609 walk_state->op = *op;
610 walk_state->op_info =
611 acpi_ps_get_opcode_info((*op)->common.aml_opcode);
612 walk_state->opcode = (*op)->common.aml_opcode;
613
614 status = walk_state->ascending_callback(walk_state);
615 status =
616 acpi_ps_next_parse_state(walk_state, *op, status);
617
618 status2 = acpi_ps_complete_this_op(walk_state, *op);
619 if (ACPI_FAILURE(status2)) {
620 return_ACPI_STATUS(status2);
621 }
622 }
623
624 status = AE_OK;
625 break;
626
627 case AE_CTRL_BREAK:
628 case AE_CTRL_CONTINUE:
629
630 /* Pop off scopes until we find the While */
631
632 while (!(*op) || ((*op)->common.aml_opcode != AML_WHILE_OP)) {
633 acpi_ps_pop_scope(&(walk_state->parser_state), op,
634 &walk_state->arg_types,
635 &walk_state->arg_count);
636 }
637
638 /* Close this iteration of the While loop */
639
640 walk_state->op = *op;
641 walk_state->op_info =
642 acpi_ps_get_opcode_info((*op)->common.aml_opcode);
643 walk_state->opcode = (*op)->common.aml_opcode;
644
645 status = walk_state->ascending_callback(walk_state);
646 status = acpi_ps_next_parse_state(walk_state, *op, status);
647
648 status2 = acpi_ps_complete_this_op(walk_state, *op);
649 if (ACPI_FAILURE(status2)) {
650 return_ACPI_STATUS(status2);
651 }
652
653 status = AE_OK;
654 break;
655
656 case AE_CTRL_TERMINATE:
657
658 /* Clean up */
659 do {
660 if (*op) {
661 status2 =
662 acpi_ps_complete_this_op(walk_state, *op);
663 if (ACPI_FAILURE(status2)) {
664 return_ACPI_STATUS(status2);
665 }
666
667 acpi_ut_delete_generic_state
668 (acpi_ut_pop_generic_state
669 (&walk_state->control_state));
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 return_ACPI_STATUS(AE_OK);
679
680 default: /* All other non-AE_OK status */
681
682 do {
683 if (*op) {
684 status2 =
685 acpi_ps_complete_this_op(walk_state, *op);
686 if (ACPI_FAILURE(status2)) {
687 return_ACPI_STATUS(status2);
688 }
689 }
690
691 acpi_ps_pop_scope(&(walk_state->parser_state), op,
692 &walk_state->arg_types,
693 &walk_state->arg_count);
694
695 } while (*op);
696
697 #if 0
698 /*
699 * TBD: Cleanup parse ops on error
700 */
701 if (*op == NULL) {
702 acpi_ps_pop_scope(parser_state, op,
703 &walk_state->arg_types,
704 &walk_state->arg_count);
705 }
706 #endif
707 walk_state->prev_op = NULL;
708 walk_state->prev_arg_types = walk_state->arg_types;
709 return_ACPI_STATUS(status);
710 }
711
712 /* This scope complete? */
713
714 if (acpi_ps_has_completed_scope(&(walk_state->parser_state))) {
715 acpi_ps_pop_scope(&(walk_state->parser_state), op,
716 &walk_state->arg_types,
717 &walk_state->arg_count);
718 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Popped scope, Op=%p\n", *op));
719 } else {
720 *op = NULL;
721 }
722
723 ACPI_PREEMPTION_POINT();
724
725 return_ACPI_STATUS(AE_OK);
726 }
727
728 /*******************************************************************************
729 *
730 * FUNCTION: acpi_ps_complete_final_op
731 *
732 * PARAMETERS: walk_state - Current state
733 * Op - Current Op
734 * Status - Current parse status before complete last
735 * Op
736 *
737 * RETURN: Status
738 *
739 * DESCRIPTION: Complete last Op.
740 *
741 ******************************************************************************/
742
743 static acpi_status
744 acpi_ps_complete_final_op(struct acpi_walk_state *walk_state,
745 union acpi_parse_object *op, acpi_status status)
746 {
747 acpi_status status2;
748
749 ACPI_FUNCTION_TRACE_PTR(ps_complete_final_op, walk_state);
750
751 /*
752 * Complete the last Op (if not completed), and clear the scope stack.
753 * It is easily possible to end an AML "package" with an unbounded number
754 * of open scopes (such as when several ASL blocks are closed with
755 * sequential closing braces). We want to terminate each one cleanly.
756 */
757 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "AML package complete at Op %p\n",
758 op));
759 do {
760 if (op) {
761 if (walk_state->ascending_callback != NULL) {
762 walk_state->op = op;
763 walk_state->op_info =
764 acpi_ps_get_opcode_info(op->common.
765 aml_opcode);
766 walk_state->opcode = op->common.aml_opcode;
767
768 status =
769 walk_state->ascending_callback(walk_state);
770 status =
771 acpi_ps_next_parse_state(walk_state, op,
772 status);
773 if (status == AE_CTRL_PENDING) {
774 status =
775 acpi_ps_complete_op(walk_state, &op,
776 AE_OK);
777 if (ACPI_FAILURE(status)) {
778 return_ACPI_STATUS(status);
779 }
780 }
781
782 if (status == AE_CTRL_TERMINATE) {
783 status = AE_OK;
784
785 /* Clean up */
786 do {
787 if (op) {
788 status2 =
789 acpi_ps_complete_this_op
790 (walk_state, op);
791 if (ACPI_FAILURE
792 (status2)) {
793 return_ACPI_STATUS
794 (status2);
795 }
796 }
797
798 acpi_ps_pop_scope(&
799 (walk_state->
800 parser_state),
801 &op,
802 &walk_state->
803 arg_types,
804 &walk_state->
805 arg_count);
806
807 } while (op);
808
809 return_ACPI_STATUS(status);
810 }
811
812 else if (ACPI_FAILURE(status)) {
813
814 /* First error is most important */
815
816 (void)
817 acpi_ps_complete_this_op(walk_state,
818 op);
819 return_ACPI_STATUS(status);
820 }
821 }
822
823 status2 = acpi_ps_complete_this_op(walk_state, op);
824 if (ACPI_FAILURE(status2)) {
825 return_ACPI_STATUS(status2);
826 }
827 }
828
829 acpi_ps_pop_scope(&(walk_state->parser_state), &op,
830 &walk_state->arg_types,
831 &walk_state->arg_count);
832
833 } while (op);
834
835 return_ACPI_STATUS(status);
836 }
837
838 /*******************************************************************************
839 *
840 * FUNCTION: acpi_ps_parse_loop
841 *
842 * PARAMETERS: walk_state - Current state
843 *
844 * RETURN: Status
845 *
846 * DESCRIPTION: Parse AML (pointed to by the current parser state) and return
847 * a tree of ops.
848 *
849 ******************************************************************************/
850
851 acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state)
852 {
853 acpi_status status = AE_OK;
854 union acpi_parse_object *op = NULL; /* current op */
855 struct acpi_parse_state *parser_state;
856 u8 *aml_op_start = NULL;
857
858 ACPI_FUNCTION_TRACE_PTR(ps_parse_loop, walk_state);
859
860 if (walk_state->descending_callback == NULL) {
861 return_ACPI_STATUS(AE_BAD_PARAMETER);
862 }
863
864 parser_state = &walk_state->parser_state;
865 walk_state->arg_types = 0;
866
867 #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
868
869 if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) {
870
871 /* We are restarting a preempted control method */
872
873 if (acpi_ps_has_completed_scope(parser_state)) {
874 /*
875 * We must check if a predicate to an IF or WHILE statement
876 * was just completed
877 */
878 if ((parser_state->scope->parse_scope.op) &&
879 ((parser_state->scope->parse_scope.op->common.
880 aml_opcode == AML_IF_OP)
881 || (parser_state->scope->parse_scope.op->common.
882 aml_opcode == AML_WHILE_OP))
883 && (walk_state->control_state)
884 && (walk_state->control_state->common.state ==
885 ACPI_CONTROL_PREDICATE_EXECUTING)) {
886 /*
887 * A predicate was just completed, get the value of the
888 * predicate and branch based on that value
889 */
890 walk_state->op = NULL;
891 status =
892 acpi_ds_get_predicate_value(walk_state,
893 ACPI_TO_POINTER
894 (TRUE));
895 if (ACPI_FAILURE(status)
896 && ((status & AE_CODE_MASK) !=
897 AE_CODE_CONTROL)) {
898 if (status == AE_AML_NO_RETURN_VALUE) {
899 ACPI_EXCEPTION((AE_INFO, status,
900 "Invoked method did not return a value"));
901
902 }
903
904 ACPI_EXCEPTION((AE_INFO, status,
905 "GetPredicate Failed"));
906 return_ACPI_STATUS(status);
907 }
908
909 status =
910 acpi_ps_next_parse_state(walk_state, op,
911 status);
912 }
913
914 acpi_ps_pop_scope(parser_state, &op,
915 &walk_state->arg_types,
916 &walk_state->arg_count);
917 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
918 "Popped scope, Op=%p\n", op));
919 } else if (walk_state->prev_op) {
920
921 /* We were in the middle of an op */
922
923 op = walk_state->prev_op;
924 walk_state->arg_types = walk_state->prev_arg_types;
925 }
926 }
927 #endif
928
929 /* Iterative parsing loop, while there is more AML to process: */
930
931 while ((parser_state->aml < parser_state->aml_end) || (op)) {
932 aml_op_start = parser_state->aml;
933 if (!op) {
934 status =
935 acpi_ps_create_op(walk_state, aml_op_start, &op);
936 if (ACPI_FAILURE(status)) {
937 if (status == AE_CTRL_PARSE_CONTINUE) {
938 continue;
939 }
940
941 if (status == AE_CTRL_PARSE_PENDING) {
942 status = AE_OK;
943 }
944
945 status =
946 acpi_ps_complete_op(walk_state, &op,
947 status);
948 if (ACPI_FAILURE(status)) {
949 return_ACPI_STATUS(status);
950 }
951
952 continue;
953 }
954
955 op->common.aml_offset = walk_state->aml_offset;
956
957 if (walk_state->op_info) {
958 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
959 "Opcode %4.4X [%s] Op %p Aml %p AmlOffset %5.5X\n",
960 (u32) op->common.aml_opcode,
961 walk_state->op_info->name, op,
962 parser_state->aml,
963 op->common.aml_offset));
964 }
965 }
966
967 /*
968 * Start arg_count at zero because we don't know if there are
969 * any args yet
970 */
971 walk_state->arg_count = 0;
972
973 /* Are there any arguments that must be processed? */
974
975 if (walk_state->arg_types) {
976
977 /* Get arguments */
978
979 status =
980 acpi_ps_get_arguments(walk_state, aml_op_start, op);
981 if (ACPI_FAILURE(status)) {
982 status =
983 acpi_ps_complete_op(walk_state, &op,
984 status);
985 if (ACPI_FAILURE(status)) {
986 return_ACPI_STATUS(status);
987 }
988
989 continue;
990 }
991 }
992
993 /* Check for arguments that need to be processed */
994
995 if (walk_state->arg_count) {
996 /*
997 * There are arguments (complex ones), push Op and
998 * prepare for argument
999 */
1000 status = acpi_ps_push_scope(parser_state, op,
1001 walk_state->arg_types,
1002 walk_state->arg_count);
1003 if (ACPI_FAILURE(status)) {
1004 status =
1005 acpi_ps_complete_op(walk_state, &op,
1006 status);
1007 if (ACPI_FAILURE(status)) {
1008 return_ACPI_STATUS(status);
1009 }
1010
1011 continue;
1012 }
1013
1014 op = NULL;
1015 continue;
1016 }
1017
1018 /*
1019 * All arguments have been processed -- Op is complete,
1020 * prepare for next
1021 */
1022 walk_state->op_info =
1023 acpi_ps_get_opcode_info(op->common.aml_opcode);
1024 if (walk_state->op_info->flags & AML_NAMED) {
1025 if (acpi_gbl_depth) {
1026 acpi_gbl_depth--;
1027 }
1028
1029 if (op->common.aml_opcode == AML_REGION_OP ||
1030 op->common.aml_opcode == AML_DATA_REGION_OP) {
1031 /*
1032 * Skip parsing of control method or opregion body,
1033 * because we don't have enough info in the first pass
1034 * to parse them correctly.
1035 *
1036 * Completed parsing an op_region declaration, we now
1037 * know the length.
1038 */
1039 op->named.length =
1040 (u32) (parser_state->aml - op->named.data);
1041 }
1042 }
1043
1044 if (walk_state->op_info->flags & AML_CREATE) {
1045 /*
1046 * Backup to beginning of create_xXXfield declaration (1 for
1047 * Opcode)
1048 *
1049 * body_length is unknown until we parse the body
1050 */
1051 op->named.length =
1052 (u32) (parser_state->aml - op->named.data);
1053 }
1054
1055 if (op->common.aml_opcode == AML_BANK_FIELD_OP) {
1056 /*
1057 * Backup to beginning of bank_field declaration
1058 *
1059 * body_length is unknown until we parse the body
1060 */
1061 op->named.length =
1062 (u32) (parser_state->aml - op->named.data);
1063 }
1064
1065 /* This op complete, notify the dispatcher */
1066
1067 if (walk_state->ascending_callback != NULL) {
1068 walk_state->op = op;
1069 walk_state->opcode = op->common.aml_opcode;
1070
1071 status = walk_state->ascending_callback(walk_state);
1072 status =
1073 acpi_ps_next_parse_state(walk_state, op, status);
1074 if (status == AE_CTRL_PENDING) {
1075 status = AE_OK;
1076 }
1077 }
1078
1079 status = acpi_ps_complete_op(walk_state, &op, status);
1080 if (ACPI_FAILURE(status)) {
1081 return_ACPI_STATUS(status);
1082 }
1083
1084 } /* while parser_state->Aml */
1085
1086 status = acpi_ps_complete_final_op(walk_state, op, status);
1087 return_ACPI_STATUS(status);
1088 }
Support for the Chinese Samsung S3C2440 based development boards