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sysfs: Implement sysfs_getattr & sysfs_permission
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / acpi / acpica / psloop.c
blob0988e4a8901da1c262230c79013be926f089c733
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 static void
90 acpi_ps_link_module_code(union acpi_parse_object *parent_op,
91 u8 *aml_start, u32 aml_length, acpi_owner_id owner_id);
92
93 /*******************************************************************************
94 *
95 * FUNCTION: acpi_ps_get_aml_opcode
96 *
97 * PARAMETERS: walk_state - Current state
98 *
99 * RETURN: Status
100 *
101 * DESCRIPTION: Extract the next AML opcode from the input stream.
102 *
103 ******************************************************************************/
104
105 static acpi_status acpi_ps_get_aml_opcode(struct acpi_walk_state *walk_state)
106 {
107
108 ACPI_FUNCTION_TRACE_PTR(ps_get_aml_opcode, walk_state);
109
110 walk_state->aml_offset =
111 (u32) ACPI_PTR_DIFF(walk_state->parser_state.aml,
112 walk_state->parser_state.aml_start);
113 walk_state->opcode = acpi_ps_peek_opcode(&(walk_state->parser_state));
114
115 /*
116 * First cut to determine what we have found:
117 * 1) A valid AML opcode
118 * 2) A name string
119 * 3) An unknown/invalid opcode
120 */
121 walk_state->op_info = acpi_ps_get_opcode_info(walk_state->opcode);
122
123 switch (walk_state->op_info->class) {
124 case AML_CLASS_ASCII:
125 case AML_CLASS_PREFIX:
126 /*
127 * Starts with a valid prefix or ASCII char, this is a name
128 * string. Convert the bare name string to a namepath.
129 */
130 walk_state->opcode = AML_INT_NAMEPATH_OP;
131 walk_state->arg_types = ARGP_NAMESTRING;
132 break;
133
134 case AML_CLASS_UNKNOWN:
135
136 /* The opcode is unrecognized. Just skip unknown opcodes */
137
138 ACPI_ERROR((AE_INFO,
139 "Found unknown opcode %X at AML address %p offset %X, ignoring",
140 walk_state->opcode, walk_state->parser_state.aml,
141 walk_state->aml_offset));
142
143 ACPI_DUMP_BUFFER(walk_state->parser_state.aml, 128);
144
145 /* Assume one-byte bad opcode */
146
147 walk_state->parser_state.aml++;
148 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
149
150 default:
151
152 /* Found opcode info, this is a normal opcode */
153
154 walk_state->parser_state.aml +=
155 acpi_ps_get_opcode_size(walk_state->opcode);
156 walk_state->arg_types = walk_state->op_info->parse_args;
157 break;
158 }
159
160 return_ACPI_STATUS(AE_OK);
161 }
162
163 /*******************************************************************************
164 *
165 * FUNCTION: acpi_ps_build_named_op
166 *
167 * PARAMETERS: walk_state - Current state
168 * aml_op_start - Begin of named Op in AML
169 * unnamed_op - Early Op (not a named Op)
170 * Op - Returned Op
171 *
172 * RETURN: Status
173 *
174 * DESCRIPTION: Parse a named Op
175 *
176 ******************************************************************************/
177
178 static acpi_status
179 acpi_ps_build_named_op(struct acpi_walk_state *walk_state,
180 u8 * aml_op_start,
181 union acpi_parse_object *unnamed_op,
182 union acpi_parse_object **op)
183 {
184 acpi_status status = AE_OK;
185 union acpi_parse_object *arg = NULL;
186
187 ACPI_FUNCTION_TRACE_PTR(ps_build_named_op, walk_state);
188
189 unnamed_op->common.value.arg = NULL;
190 unnamed_op->common.arg_list_length = 0;
191 unnamed_op->common.aml_opcode = walk_state->opcode;
192
193 /*
194 * Get and append arguments until we find the node that contains
195 * the name (the type ARGP_NAME).
196 */
197 while (GET_CURRENT_ARG_TYPE(walk_state->arg_types) &&
198 (GET_CURRENT_ARG_TYPE(walk_state->arg_types) != ARGP_NAME)) {
199 status =
200 acpi_ps_get_next_arg(walk_state,
201 &(walk_state->parser_state),
202 GET_CURRENT_ARG_TYPE(walk_state->
203 arg_types), &arg);
204 if (ACPI_FAILURE(status)) {
205 return_ACPI_STATUS(status);
206 }
207
208 acpi_ps_append_arg(unnamed_op, arg);
209 INCREMENT_ARG_LIST(walk_state->arg_types);
210 }
211
212 /*
213 * Make sure that we found a NAME and didn't run out of arguments
214 */
215 if (!GET_CURRENT_ARG_TYPE(walk_state->arg_types)) {
216 return_ACPI_STATUS(AE_AML_NO_OPERAND);
217 }
218
219 /* We know that this arg is a name, move to next arg */
220
221 INCREMENT_ARG_LIST(walk_state->arg_types);
222
223 /*
224 * Find the object. This will either insert the object into
225 * the namespace or simply look it up
226 */
227 walk_state->op = NULL;
228
229 status = walk_state->descending_callback(walk_state, op);
230 if (ACPI_FAILURE(status)) {
231 ACPI_EXCEPTION((AE_INFO, status, "During name lookup/catalog"));
232 return_ACPI_STATUS(status);
233 }
234
235 if (!*op) {
236 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
237 }
238
239 status = acpi_ps_next_parse_state(walk_state, *op, status);
240 if (ACPI_FAILURE(status)) {
241 if (status == AE_CTRL_PENDING) {
242 return_ACPI_STATUS(AE_CTRL_PARSE_PENDING);
243 }
244 return_ACPI_STATUS(status);
245 }
246
247 acpi_ps_append_arg(*op, unnamed_op->common.value.arg);
248 acpi_gbl_depth++;
249
250 if ((*op)->common.aml_opcode == AML_REGION_OP ||
251 (*op)->common.aml_opcode == AML_DATA_REGION_OP) {
252 /*
253 * Defer final parsing of an operation_region body, because we don't
254 * have enough info in the first pass to parse it correctly (i.e.,
255 * there may be method calls within the term_arg elements of the body.)
256 *
257 * However, we must continue parsing because the opregion is not a
258 * standalone package -- we don't know where the end is at this point.
259 *
260 * (Length is unknown until parse of the body complete)
261 */
262 (*op)->named.data = aml_op_start;
263 (*op)->named.length = 0;
264 }
265
266 return_ACPI_STATUS(AE_OK);
267 }
268
269 /*******************************************************************************
270 *
271 * FUNCTION: acpi_ps_create_op
272 *
273 * PARAMETERS: walk_state - Current state
274 * aml_op_start - Op start in AML
275 * new_op - Returned Op
276 *
277 * RETURN: Status
278 *
279 * DESCRIPTION: Get Op from AML
280 *
281 ******************************************************************************/
282
283 static acpi_status
284 acpi_ps_create_op(struct acpi_walk_state *walk_state,
285 u8 * aml_op_start, union acpi_parse_object **new_op)
286 {
287 acpi_status status = AE_OK;
288 union acpi_parse_object *op;
289 union acpi_parse_object *named_op = NULL;
290 union acpi_parse_object *parent_scope;
291 u8 argument_count;
292 const struct acpi_opcode_info *op_info;
293
294 ACPI_FUNCTION_TRACE_PTR(ps_create_op, walk_state);
295
296 status = acpi_ps_get_aml_opcode(walk_state);
297 if (status == AE_CTRL_PARSE_CONTINUE) {
298 return_ACPI_STATUS(AE_CTRL_PARSE_CONTINUE);
299 }
300
301 /* Create Op structure and append to parent's argument list */
302
303 walk_state->op_info = acpi_ps_get_opcode_info(walk_state->opcode);
304 op = acpi_ps_alloc_op(walk_state->opcode);
305 if (!op) {
306 return_ACPI_STATUS(AE_NO_MEMORY);
307 }
308
309 if (walk_state->op_info->flags & AML_NAMED) {
310 status =
311 acpi_ps_build_named_op(walk_state, aml_op_start, op,
312 &named_op);
313 acpi_ps_free_op(op);
314 if (ACPI_FAILURE(status)) {
315 return_ACPI_STATUS(status);
316 }
317
318 *new_op = named_op;
319 return_ACPI_STATUS(AE_OK);
320 }
321
322 /* Not a named opcode, just allocate Op and append to parent */
323
324 if (walk_state->op_info->flags & AML_CREATE) {
325 /*
326 * Backup to beginning of create_xXXfield declaration
327 * body_length is unknown until we parse the body
328 */
329 op->named.data = aml_op_start;
330 op->named.length = 0;
331 }
332
333 if (walk_state->opcode == AML_BANK_FIELD_OP) {
334 /*
335 * Backup to beginning of bank_field declaration
336 * body_length is unknown until we parse the body
337 */
338 op->named.data = aml_op_start;
339 op->named.length = 0;
340 }
341
342 parent_scope = acpi_ps_get_parent_scope(&(walk_state->parser_state));
343 acpi_ps_append_arg(parent_scope, op);
344
345 if (parent_scope) {
346 op_info =
347 acpi_ps_get_opcode_info(parent_scope->common.aml_opcode);
348 if (op_info->flags & AML_HAS_TARGET) {
349 argument_count =
350 acpi_ps_get_argument_count(op_info->type);
351 if (parent_scope->common.arg_list_length >
352 argument_count) {
353 op->common.flags |= ACPI_PARSEOP_TARGET;
354 }
355 } else if (parent_scope->common.aml_opcode == AML_INCREMENT_OP) {
356 op->common.flags |= ACPI_PARSEOP_TARGET;
357 }
358 }
359
360 if (walk_state->descending_callback != NULL) {
361 /*
362 * Find the object. This will either insert the object into
363 * the namespace or simply look it up
364 */
365 walk_state->op = *new_op = op;
366
367 status = walk_state->descending_callback(walk_state, &op);
368 status = acpi_ps_next_parse_state(walk_state, op, status);
369 if (status == AE_CTRL_PENDING) {
370 status = AE_CTRL_PARSE_PENDING;
371 }
372 }
373
374 return_ACPI_STATUS(status);
375 }
376
377 /*******************************************************************************
378 *
379 * FUNCTION: acpi_ps_get_arguments
380 *
381 * PARAMETERS: walk_state - Current state
382 * aml_op_start - Op start in AML
383 * Op - Current Op
384 *
385 * RETURN: Status
386 *
387 * DESCRIPTION: Get arguments for passed Op.
388 *
389 ******************************************************************************/
390
391 static acpi_status
392 acpi_ps_get_arguments(struct acpi_walk_state *walk_state,
393 u8 * aml_op_start, union acpi_parse_object *op)
394 {
395 acpi_status status = AE_OK;
396 union acpi_parse_object *arg = NULL;
397 const struct acpi_opcode_info *op_info;
398
399 ACPI_FUNCTION_TRACE_PTR(ps_get_arguments, walk_state);
400
401 switch (op->common.aml_opcode) {
402 case AML_BYTE_OP: /* AML_BYTEDATA_ARG */
403 case AML_WORD_OP: /* AML_WORDDATA_ARG */
404 case AML_DWORD_OP: /* AML_DWORDATA_ARG */
405 case AML_QWORD_OP: /* AML_QWORDATA_ARG */
406 case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */
407
408 /* Fill in constant or string argument directly */
409
410 acpi_ps_get_next_simple_arg(&(walk_state->parser_state),
411 GET_CURRENT_ARG_TYPE(walk_state->
412 arg_types),
413 op);
414 break;
415
416 case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */
417
418 status =
419 acpi_ps_get_next_namepath(walk_state,
420 &(walk_state->parser_state), op,
421 1);
422 if (ACPI_FAILURE(status)) {
423 return_ACPI_STATUS(status);
424 }
425
426 walk_state->arg_types = 0;
427 break;
428
429 default:
430 /*
431 * Op is not a constant or string, append each argument to the Op
432 */
433 while (GET_CURRENT_ARG_TYPE(walk_state->arg_types)
434 && !walk_state->arg_count) {
435 walk_state->aml_offset =
436 (u32) ACPI_PTR_DIFF(walk_state->parser_state.aml,
437 walk_state->parser_state.
438 aml_start);
439
440 status =
441 acpi_ps_get_next_arg(walk_state,
442 &(walk_state->parser_state),
443 GET_CURRENT_ARG_TYPE
444 (walk_state->arg_types), &arg);
445 if (ACPI_FAILURE(status)) {
446 return_ACPI_STATUS(status);
447 }
448
449 if (arg) {
450 arg->common.aml_offset = walk_state->aml_offset;
451 acpi_ps_append_arg(op, arg);
452 }
453
454 INCREMENT_ARG_LIST(walk_state->arg_types);
455 }
456
457 /*
458 * Handle executable code at "module-level". This refers to
459 * executable opcodes that appear outside of any control method.
460 */
461 if ((walk_state->pass_number <= ACPI_IMODE_LOAD_PASS2) &&
462 ((walk_state->parse_flags & ACPI_PARSE_DISASSEMBLE) == 0)) {
463 /*
464 * We want to skip If/Else/While constructs during Pass1 because we
465 * want to actually conditionally execute the code during Pass2.
466 *
467 * Except for disassembly, where we always want to walk the
468 * If/Else/While packages
469 */
470 switch (op->common.aml_opcode) {
471 case AML_IF_OP:
472 case AML_ELSE_OP:
473 case AML_WHILE_OP:
474
475 /*
476 * Currently supported module-level opcodes are:
477 * IF/ELSE/WHILE. These appear to be the most common,
478 * and easiest to support since they open an AML
479 * package.
480 */
481 if (walk_state->pass_number ==
482 ACPI_IMODE_LOAD_PASS1) {
483 acpi_ps_link_module_code(op->common.
484 parent,
485 aml_op_start,
486 (u32)
487 (walk_state->
488 parser_state.
489 pkg_end -
490 aml_op_start),
491 walk_state->
492 owner_id);
493 }
494
495 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
496 "Pass1: Skipping an If/Else/While body\n"));
497
498 /* Skip body of if/else/while in pass 1 */
499
500 walk_state->parser_state.aml =
501 walk_state->parser_state.pkg_end;
502 walk_state->arg_count = 0;
503 break;
504
505 default:
506 /*
507 * Check for an unsupported executable opcode at module
508 * level. We must be in PASS1, the parent must be a SCOPE,
509 * The opcode class must be EXECUTE, and the opcode must
510 * not be an argument to another opcode.
511 */
512 if ((walk_state->pass_number ==
513 ACPI_IMODE_LOAD_PASS1)
514 && (op->common.parent->common.aml_opcode ==
515 AML_SCOPE_OP)) {
516 op_info =
517 acpi_ps_get_opcode_info(op->common.
518 aml_opcode);
519 if ((op_info->class ==
520 AML_CLASS_EXECUTE) && (!arg)) {
521 ACPI_WARNING((AE_INFO,
522 "Detected an unsupported executable opcode "
523 "at module-level: [0x%.4X] at table offset 0x%.4X",
524 op->common.aml_opcode,
525 (u32)((aml_op_start - walk_state->parser_state.aml_start)
526 + sizeof(struct acpi_table_header))));
527 }
528 }
529 break;
530 }
531 }
532
533 /* Special processing for certain opcodes */
534
535 switch (op->common.aml_opcode) {
536 case AML_METHOD_OP:
537 /*
538 * Skip parsing of control method because we don't have enough
539 * info in the first pass to parse it correctly.
540 *
541 * Save the length and address of the body
542 */
543 op->named.data = walk_state->parser_state.aml;
544 op->named.length = (u32)
545 (walk_state->parser_state.pkg_end -
546 walk_state->parser_state.aml);
547
548 /* Skip body of method */
549
550 walk_state->parser_state.aml =
551 walk_state->parser_state.pkg_end;
552 walk_state->arg_count = 0;
553 break;
554
555 case AML_BUFFER_OP:
556 case AML_PACKAGE_OP:
557 case AML_VAR_PACKAGE_OP:
558
559 if ((op->common.parent) &&
560 (op->common.parent->common.aml_opcode ==
561 AML_NAME_OP)
562 && (walk_state->pass_number <=
563 ACPI_IMODE_LOAD_PASS2)) {
564 /*
565 * Skip parsing of Buffers and Packages because we don't have
566 * enough info in the first pass to parse them correctly.
567 */
568 op->named.data = aml_op_start;
569 op->named.length = (u32)
570 (walk_state->parser_state.pkg_end -
571 aml_op_start);
572
573 /* Skip body */
574
575 walk_state->parser_state.aml =
576 walk_state->parser_state.pkg_end;
577 walk_state->arg_count = 0;
578 }
579 break;
580
581 case AML_WHILE_OP:
582
583 if (walk_state->control_state) {
584 walk_state->control_state->control.package_end =
585 walk_state->parser_state.pkg_end;
586 }
587 break;
588
589 default:
590
591 /* No action for all other opcodes */
592 break;
593 }
594
595 break;
596 }
597
598 return_ACPI_STATUS(AE_OK);
599 }
600
601 /*******************************************************************************
602 *
603 * FUNCTION: acpi_ps_link_module_code
604 *
605 * PARAMETERS: parent_op - Parent parser op
606 * aml_start - Pointer to the AML
607 * aml_length - Length of executable AML
608 * owner_id - owner_id of module level code
609 *
610 * RETURN: None.
611 *
612 * DESCRIPTION: Wrap the module-level code with a method object and link the
613 * object to the global list. Note, the mutex field of the method
614 * object is used to link multiple module-level code objects.
615 *
616 ******************************************************************************/
617
618 static void
619 acpi_ps_link_module_code(union acpi_parse_object *parent_op,
620 u8 *aml_start, u32 aml_length, acpi_owner_id owner_id)
621 {
622 union acpi_operand_object *prev;
623 union acpi_operand_object *next;
624 union acpi_operand_object *method_obj;
625 struct acpi_namespace_node *parent_node;
626
627 /* Get the tail of the list */
628
629 prev = next = acpi_gbl_module_code_list;
630 while (next) {
631 prev = next;
632 next = next->method.mutex;
633 }
634
635 /*
636 * Insert the module level code into the list. Merge it if it is
637 * adjacent to the previous element.
638 */
639 if (!prev ||
640 ((prev->method.aml_start + prev->method.aml_length) != aml_start)) {
641
642 /* Create, initialize, and link a new temporary method object */
643
644 method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
645 if (!method_obj) {
646 return;
647 }
648
649 if (parent_op->common.node) {
650 parent_node = parent_op->common.node;
651 } else {
652 parent_node = acpi_gbl_root_node;
653 }
654
655 method_obj->method.aml_start = aml_start;
656 method_obj->method.aml_length = aml_length;
657 method_obj->method.owner_id = owner_id;
658 method_obj->method.flags |= AOPOBJ_MODULE_LEVEL;
659
660 /*
661 * Save the parent node in next_object. This is cheating, but we
662 * don't want to expand the method object.
663 */
664 method_obj->method.next_object =
665 ACPI_CAST_PTR(union acpi_operand_object, parent_node);
666
667 if (!prev) {
668 acpi_gbl_module_code_list = method_obj;
669 } else {
670 prev->method.mutex = method_obj;
671 }
672 } else {
673 prev->method.aml_length += aml_length;
674 }
675 }
676
677 /*******************************************************************************
678 *
679 * FUNCTION: acpi_ps_complete_op
680 *
681 * PARAMETERS: walk_state - Current state
682 * Op - Returned Op
683 * Status - Parse status before complete Op
684 *
685 * RETURN: Status
686 *
687 * DESCRIPTION: Complete Op
688 *
689 ******************************************************************************/
690
691 static acpi_status
692 acpi_ps_complete_op(struct acpi_walk_state *walk_state,
693 union acpi_parse_object **op, acpi_status status)
694 {
695 acpi_status status2;
696
697 ACPI_FUNCTION_TRACE_PTR(ps_complete_op, walk_state);
698
699 /*
700 * Finished one argument of the containing scope
701 */
702 walk_state->parser_state.scope->parse_scope.arg_count--;
703
704 /* Close this Op (will result in parse subtree deletion) */
705
706 status2 = acpi_ps_complete_this_op(walk_state, *op);
707 if (ACPI_FAILURE(status2)) {
708 return_ACPI_STATUS(status2);
709 }
710
711 *op = NULL;
712
713 switch (status) {
714 case AE_OK:
715 break;
716
717 case AE_CTRL_TRANSFER:
718
719 /* We are about to transfer to a called method */
720
721 walk_state->prev_op = NULL;
722 walk_state->prev_arg_types = walk_state->arg_types;
723 return_ACPI_STATUS(status);
724
725 case AE_CTRL_END:
726
727 acpi_ps_pop_scope(&(walk_state->parser_state), op,
728 &walk_state->arg_types,
729 &walk_state->arg_count);
730
731 if (*op) {
732 walk_state->op = *op;
733 walk_state->op_info =
734 acpi_ps_get_opcode_info((*op)->common.aml_opcode);
735 walk_state->opcode = (*op)->common.aml_opcode;
736
737 status = walk_state->ascending_callback(walk_state);
738 status =
739 acpi_ps_next_parse_state(walk_state, *op, status);
740
741 status2 = acpi_ps_complete_this_op(walk_state, *op);
742 if (ACPI_FAILURE(status2)) {
743 return_ACPI_STATUS(status2);
744 }
745 }
746
747 status = AE_OK;
748 break;
749
750 case AE_CTRL_BREAK:
751 case AE_CTRL_CONTINUE:
752
753 /* Pop off scopes until we find the While */
754
755 while (!(*op) || ((*op)->common.aml_opcode != AML_WHILE_OP)) {
756 acpi_ps_pop_scope(&(walk_state->parser_state), op,
757 &walk_state->arg_types,
758 &walk_state->arg_count);
759 }
760
761 /* Close this iteration of the While loop */
762
763 walk_state->op = *op;
764 walk_state->op_info =
765 acpi_ps_get_opcode_info((*op)->common.aml_opcode);
766 walk_state->opcode = (*op)->common.aml_opcode;
767
768 status = walk_state->ascending_callback(walk_state);
769 status = acpi_ps_next_parse_state(walk_state, *op, status);
770
771 status2 = acpi_ps_complete_this_op(walk_state, *op);
772 if (ACPI_FAILURE(status2)) {
773 return_ACPI_STATUS(status2);
774 }
775
776 status = AE_OK;
777 break;
778
779 case AE_CTRL_TERMINATE:
780
781 /* Clean up */
782 do {
783 if (*op) {
784 status2 =
785 acpi_ps_complete_this_op(walk_state, *op);
786 if (ACPI_FAILURE(status2)) {
787 return_ACPI_STATUS(status2);
788 }
789
790 acpi_ut_delete_generic_state
791 (acpi_ut_pop_generic_state
792 (&walk_state->control_state));
793 }
794
795 acpi_ps_pop_scope(&(walk_state->parser_state), op,
796 &walk_state->arg_types,
797 &walk_state->arg_count);
798
799 } while (*op);
800
801 return_ACPI_STATUS(AE_OK);
802
803 default: /* All other non-AE_OK status */
804
805 do {
806 if (*op) {
807 status2 =
808 acpi_ps_complete_this_op(walk_state, *op);
809 if (ACPI_FAILURE(status2)) {
810 return_ACPI_STATUS(status2);
811 }
812 }
813
814 acpi_ps_pop_scope(&(walk_state->parser_state), op,
815 &walk_state->arg_types,
816 &walk_state->arg_count);
817
818 } while (*op);
819
820 #if 0
821 /*
822 * TBD: Cleanup parse ops on error
823 */
824 if (*op == NULL) {
825 acpi_ps_pop_scope(parser_state, op,
826 &walk_state->arg_types,
827 &walk_state->arg_count);
828 }
829 #endif
830 walk_state->prev_op = NULL;
831 walk_state->prev_arg_types = walk_state->arg_types;
832 return_ACPI_STATUS(status);
833 }
834
835 /* This scope complete? */
836
837 if (acpi_ps_has_completed_scope(&(walk_state->parser_state))) {
838 acpi_ps_pop_scope(&(walk_state->parser_state), op,
839 &walk_state->arg_types,
840 &walk_state->arg_count);
841 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Popped scope, Op=%p\n", *op));
842 } else {
843 *op = NULL;
844 }
845
846 ACPI_PREEMPTION_POINT();
847
848 return_ACPI_STATUS(AE_OK);
849 }
850
851 /*******************************************************************************
852 *
853 * FUNCTION: acpi_ps_complete_final_op
854 *
855 * PARAMETERS: walk_state - Current state
856 * Op - Current Op
857 * Status - Current parse status before complete last
858 * Op
859 *
860 * RETURN: Status
861 *
862 * DESCRIPTION: Complete last Op.
863 *
864 ******************************************************************************/
865
866 static acpi_status
867 acpi_ps_complete_final_op(struct acpi_walk_state *walk_state,
868 union acpi_parse_object *op, acpi_status status)
869 {
870 acpi_status status2;
871
872 ACPI_FUNCTION_TRACE_PTR(ps_complete_final_op, walk_state);
873
874 /*
875 * Complete the last Op (if not completed), and clear the scope stack.
876 * It is easily possible to end an AML "package" with an unbounded number
877 * of open scopes (such as when several ASL blocks are closed with
878 * sequential closing braces). We want to terminate each one cleanly.
879 */
880 ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "AML package complete at Op %p\n",
881 op));
882 do {
883 if (op) {
884 if (walk_state->ascending_callback != NULL) {
885 walk_state->op = op;
886 walk_state->op_info =
887 acpi_ps_get_opcode_info(op->common.
888 aml_opcode);
889 walk_state->opcode = op->common.aml_opcode;
890
891 status =
892 walk_state->ascending_callback(walk_state);
893 status =
894 acpi_ps_next_parse_state(walk_state, op,
895 status);
896 if (status == AE_CTRL_PENDING) {
897 status =
898 acpi_ps_complete_op(walk_state, &op,
899 AE_OK);
900 if (ACPI_FAILURE(status)) {
901 return_ACPI_STATUS(status);
902 }
903 }
904
905 if (status == AE_CTRL_TERMINATE) {
906 status = AE_OK;
907
908 /* Clean up */
909 do {
910 if (op) {
911 status2 =
912 acpi_ps_complete_this_op
913 (walk_state, op);
914 if (ACPI_FAILURE
915 (status2)) {
916 return_ACPI_STATUS
917 (status2);
918 }
919 }
920
921 acpi_ps_pop_scope(&
922 (walk_state->
923 parser_state),
924 &op,
925 &walk_state->
926 arg_types,
927 &walk_state->
928 arg_count);
929
930 } while (op);
931
932 return_ACPI_STATUS(status);
933 }
934
935 else if (ACPI_FAILURE(status)) {
936
937 /* First error is most important */
938
939 (void)
940 acpi_ps_complete_this_op(walk_state,
941 op);
942 return_ACPI_STATUS(status);
943 }
944 }
945
946 status2 = acpi_ps_complete_this_op(walk_state, op);
947 if (ACPI_FAILURE(status2)) {
948 return_ACPI_STATUS(status2);
949 }
950 }
951
952 acpi_ps_pop_scope(&(walk_state->parser_state), &op,
953 &walk_state->arg_types,
954 &walk_state->arg_count);
955
956 } while (op);
957
958 return_ACPI_STATUS(status);
959 }
960
961 /*******************************************************************************
962 *
963 * FUNCTION: acpi_ps_parse_loop
964 *
965 * PARAMETERS: walk_state - Current state
966 *
967 * RETURN: Status
968 *
969 * DESCRIPTION: Parse AML (pointed to by the current parser state) and return
970 * a tree of ops.
971 *
972 ******************************************************************************/
973
974 acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state)
975 {
976 acpi_status status = AE_OK;
977 union acpi_parse_object *op = NULL; /* current op */
978 struct acpi_parse_state *parser_state;
979 u8 *aml_op_start = NULL;
980
981 ACPI_FUNCTION_TRACE_PTR(ps_parse_loop, walk_state);
982
983 if (walk_state->descending_callback == NULL) {
984 return_ACPI_STATUS(AE_BAD_PARAMETER);
985 }
986
987 parser_state = &walk_state->parser_state;
988 walk_state->arg_types = 0;
989
990 #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
991
992 if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) {
993
994 /* We are restarting a preempted control method */
995
996 if (acpi_ps_has_completed_scope(parser_state)) {
997 /*
998 * We must check if a predicate to an IF or WHILE statement
999 * was just completed
1000 */
1001 if ((parser_state->scope->parse_scope.op) &&
1002 ((parser_state->scope->parse_scope.op->common.
1003 aml_opcode == AML_IF_OP)
1004 || (parser_state->scope->parse_scope.op->common.
1005 aml_opcode == AML_WHILE_OP))
1006 && (walk_state->control_state)
1007 && (walk_state->control_state->common.state ==
1008 ACPI_CONTROL_PREDICATE_EXECUTING)) {
1009 /*
1010 * A predicate was just completed, get the value of the
1011 * predicate and branch based on that value
1012 */
1013 walk_state->op = NULL;
1014 status =
1015 acpi_ds_get_predicate_value(walk_state,
1016 ACPI_TO_POINTER
1017 (TRUE));
1018 if (ACPI_FAILURE(status)
1019 && ((status & AE_CODE_MASK) !=
1020 AE_CODE_CONTROL)) {
1021 if (status == AE_AML_NO_RETURN_VALUE) {
1022 ACPI_EXCEPTION((AE_INFO, status,
1023 "Invoked method did not return a value"));
1024
1025 }
1026
1027 ACPI_EXCEPTION((AE_INFO, status,
1028 "GetPredicate Failed"));
1029 return_ACPI_STATUS(status);
1030 }
1031
1032 status =
1033 acpi_ps_next_parse_state(walk_state, op,
1034 status);
1035 }
1036
1037 acpi_ps_pop_scope(parser_state, &op,
1038 &walk_state->arg_types,
1039 &walk_state->arg_count);
1040 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
1041 "Popped scope, Op=%p\n", op));
1042 } else if (walk_state->prev_op) {
1043
1044 /* We were in the middle of an op */
1045
1046 op = walk_state->prev_op;
1047 walk_state->arg_types = walk_state->prev_arg_types;
1048 }
1049 }
1050 #endif
1051
1052 /* Iterative parsing loop, while there is more AML to process: */
1053
1054 while ((parser_state->aml < parser_state->aml_end) || (op)) {
1055 aml_op_start = parser_state->aml;
1056 if (!op) {
1057 status =
1058 acpi_ps_create_op(walk_state, aml_op_start, &op);
1059 if (ACPI_FAILURE(status)) {
1060 if (status == AE_CTRL_PARSE_CONTINUE) {
1061 continue;
1062 }
1063
1064 if (status == AE_CTRL_PARSE_PENDING) {
1065 status = AE_OK;
1066 }
1067
1068 status =
1069 acpi_ps_complete_op(walk_state, &op,
1070 status);
1071 if (ACPI_FAILURE(status)) {
1072 return_ACPI_STATUS(status);
1073 }
1074
1075 continue;
1076 }
1077
1078 op->common.aml_offset = walk_state->aml_offset;
1079
1080 if (walk_state->op_info) {
1081 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
1082 "Opcode %4.4X [%s] Op %p Aml %p AmlOffset %5.5X\n",
1083 (u32) op->common.aml_opcode,
1084 walk_state->op_info->name, op,
1085 parser_state->aml,
1086 op->common.aml_offset));
1087 }
1088 }
1089
1090 /*
1091 * Start arg_count at zero because we don't know if there are
1092 * any args yet
1093 */
1094 walk_state->arg_count = 0;
1095
1096 /* Are there any arguments that must be processed? */
1097
1098 if (walk_state->arg_types) {
1099
1100 /* Get arguments */
1101
1102 status =
1103 acpi_ps_get_arguments(walk_state, aml_op_start, op);
1104 if (ACPI_FAILURE(status)) {
1105 status =
1106 acpi_ps_complete_op(walk_state, &op,
1107 status);
1108 if (ACPI_FAILURE(status)) {
1109 return_ACPI_STATUS(status);
1110 }
1111
1112 continue;
1113 }
1114 }
1115
1116 /* Check for arguments that need to be processed */
1117
1118 if (walk_state->arg_count) {
1119 /*
1120 * There are arguments (complex ones), push Op and
1121 * prepare for argument
1122 */
1123 status = acpi_ps_push_scope(parser_state, op,
1124 walk_state->arg_types,
1125 walk_state->arg_count);
1126 if (ACPI_FAILURE(status)) {
1127 status =
1128 acpi_ps_complete_op(walk_state, &op,
1129 status);
1130 if (ACPI_FAILURE(status)) {
1131 return_ACPI_STATUS(status);
1132 }
1133
1134 continue;
1135 }
1136
1137 op = NULL;
1138 continue;
1139 }
1140
1141 /*
1142 * All arguments have been processed -- Op is complete,
1143 * prepare for next
1144 */
1145 walk_state->op_info =
1146 acpi_ps_get_opcode_info(op->common.aml_opcode);
1147 if (walk_state->op_info->flags & AML_NAMED) {
1148 if (acpi_gbl_depth) {
1149 acpi_gbl_depth--;
1150 }
1151
1152 if (op->common.aml_opcode == AML_REGION_OP ||
1153 op->common.aml_opcode == AML_DATA_REGION_OP) {
1154 /*
1155 * Skip parsing of control method or opregion body,
1156 * because we don't have enough info in the first pass
1157 * to parse them correctly.
1158 *
1159 * Completed parsing an op_region declaration, we now
1160 * know the length.
1161 */
1162 op->named.length =
1163 (u32) (parser_state->aml - op->named.data);
1164 }
1165 }
1166
1167 if (walk_state->op_info->flags & AML_CREATE) {
1168 /*
1169 * Backup to beginning of create_xXXfield declaration (1 for
1170 * Opcode)
1171 *
1172 * body_length is unknown until we parse the body
1173 */
1174 op->named.length =
1175 (u32) (parser_state->aml - op->named.data);
1176 }
1177
1178 if (op->common.aml_opcode == AML_BANK_FIELD_OP) {
1179 /*
1180 * Backup to beginning of bank_field declaration
1181 *
1182 * body_length is unknown until we parse the body
1183 */
1184 op->named.length =
1185 (u32) (parser_state->aml - op->named.data);
1186 }
1187
1188 /* This op complete, notify the dispatcher */
1189
1190 if (walk_state->ascending_callback != NULL) {
1191 walk_state->op = op;
1192 walk_state->opcode = op->common.aml_opcode;
1193
1194 status = walk_state->ascending_callback(walk_state);
1195 status =
1196 acpi_ps_next_parse_state(walk_state, op, status);
1197 if (status == AE_CTRL_PENDING) {
1198 status = AE_OK;
1199 }
1200 }
1201
1202 status = acpi_ps_complete_op(walk_state, &op, status);
1203 if (ACPI_FAILURE(status)) {
1204 return_ACPI_STATUS(status);
1205 }
1206
1207 } /* while parser_state->Aml */
1208
1209 status = acpi_ps_complete_final_op(walk_state, op, status);
1210 return_ACPI_STATUS(status);
1211 }
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