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Linux-2.6.12-rc2
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / acpi / parser / psparse.c
blobe79edb53cb3b969fbb3b62294fc634c0a2c3dd8e
1 /******************************************************************************
2 *
3 * Module Name: psparse - Parser top level AML parse routines
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2005, 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 /*
46 * Parse the AML and build an operation tree as most interpreters,
47 * like Perl, do. Parsing is done by hand rather than with a YACC
48 * generated parser to tightly constrain stack and dynamic memory
49 * usage. At the same time, parsing is kept flexible and the code
50 * fairly compact by parsing based on a list of AML opcode
51 * templates in aml_op_info[]
52 */
53
54 #include <acpi/acpi.h>
55 #include <acpi/acparser.h>
56 #include <acpi/acdispat.h>
57 #include <acpi/amlcode.h>
58 #include <acpi/acnamesp.h>
59 #include <acpi/acinterp.h>
60
61 #define _COMPONENT ACPI_PARSER
62 ACPI_MODULE_NAME ("psparse")
63
64
65 static u32 acpi_gbl_depth = 0;
66
67
68 /*******************************************************************************
69 *
70 * FUNCTION: acpi_ps_get_opcode_size
71 *
72 * PARAMETERS: Opcode - An AML opcode
73 *
74 * RETURN: Size of the opcode, in bytes (1 or 2)
75 *
76 * DESCRIPTION: Get the size of the current opcode.
77 *
78 ******************************************************************************/
79
80 u32
81 acpi_ps_get_opcode_size (
82 u32 opcode)
83 {
84
85 /* Extended (2-byte) opcode if > 255 */
86
87 if (opcode > 0x00FF) {
88 return (2);
89 }
90
91 /* Otherwise, just a single byte opcode */
92
93 return (1);
94 }
95
96
97 /*******************************************************************************
98 *
99 * FUNCTION: acpi_ps_peek_opcode
100 *
101 * PARAMETERS: parser_state - A parser state object
102 *
103 * RETURN: Status
104 *
105 * DESCRIPTION: Get next AML opcode (without incrementing AML pointer)
106 *
107 ******************************************************************************/
108
109 u16
110 acpi_ps_peek_opcode (
111 struct acpi_parse_state *parser_state)
112 {
113 u8 *aml;
114 u16 opcode;
115
116
117 aml = parser_state->aml;
118 opcode = (u16) ACPI_GET8 (aml);
119
120
121 if (opcode == AML_EXTOP) {
122 /* Extended opcode */
123
124 aml++;
125 opcode = (u16) ((opcode << 8) | ACPI_GET8 (aml));
126 }
127
128 return (opcode);
129 }
130
131
132 /*******************************************************************************
133 *
134 * FUNCTION: acpi_ps_complete_this_op
135 *
136 * PARAMETERS: walk_state - Current State
137 * Op - Op to complete
138 *
139 * RETURN: None.
140 *
141 * DESCRIPTION: Perform any cleanup at the completion of an Op.
142 *
143 ******************************************************************************/
144
145 void
146 acpi_ps_complete_this_op (
147 struct acpi_walk_state *walk_state,
148 union acpi_parse_object *op)
149 {
150 union acpi_parse_object *prev;
151 union acpi_parse_object *next;
152 const struct acpi_opcode_info *parent_info;
153 union acpi_parse_object *replacement_op = NULL;
154
155
156 ACPI_FUNCTION_TRACE_PTR ("ps_complete_this_op", op);
157
158
159 /* Check for null Op, can happen if AML code is corrupt */
160
161 if (!op) {
162 return_VOID;
163 }
164
165 /* Delete this op and the subtree below it if asked to */
166
167 if (((walk_state->parse_flags & ACPI_PARSE_TREE_MASK) != ACPI_PARSE_DELETE_TREE) ||
168 (walk_state->op_info->class == AML_CLASS_ARGUMENT)) {
169 return_VOID;
170 }
171
172 /* Make sure that we only delete this subtree */
173
174 if (op->common.parent) {
175 /*
176 * Check if we need to replace the operator and its subtree
177 * with a return value op (placeholder op)
178 */
179 parent_info = acpi_ps_get_opcode_info (op->common.parent->common.aml_opcode);
180
181 switch (parent_info->class) {
182 case AML_CLASS_CONTROL:
183 break;
184
185 case AML_CLASS_CREATE:
186
187 /*
188 * These opcodes contain term_arg operands. The current
189 * op must be replaced by a placeholder return op
190 */
191 replacement_op = acpi_ps_alloc_op (AML_INT_RETURN_VALUE_OP);
192 if (!replacement_op) {
193 goto cleanup;
194 }
195 break;
196
197 case AML_CLASS_NAMED_OBJECT:
198
199 /*
200 * These opcodes contain term_arg operands. The current
201 * op must be replaced by a placeholder return op
202 */
203 if ((op->common.parent->common.aml_opcode == AML_REGION_OP) ||
204 (op->common.parent->common.aml_opcode == AML_DATA_REGION_OP) ||
205 (op->common.parent->common.aml_opcode == AML_BUFFER_OP) ||
206 (op->common.parent->common.aml_opcode == AML_PACKAGE_OP) ||
207 (op->common.parent->common.aml_opcode == AML_VAR_PACKAGE_OP)) {
208 replacement_op = acpi_ps_alloc_op (AML_INT_RETURN_VALUE_OP);
209 if (!replacement_op) {
210 goto cleanup;
211 }
212 }
213
214 if ((op->common.parent->common.aml_opcode == AML_NAME_OP) &&
215 (walk_state->descending_callback != acpi_ds_exec_begin_op)) {
216 if ((op->common.aml_opcode == AML_BUFFER_OP) ||
217 (op->common.aml_opcode == AML_PACKAGE_OP) ||
218 (op->common.aml_opcode == AML_VAR_PACKAGE_OP)) {
219 replacement_op = acpi_ps_alloc_op (op->common.aml_opcode);
220 if (!replacement_op) {
221 goto cleanup;
222 }
223
224 replacement_op->named.data = op->named.data;
225 replacement_op->named.length = op->named.length;
226 }
227 }
228 break;
229
230 default:
231 replacement_op = acpi_ps_alloc_op (AML_INT_RETURN_VALUE_OP);
232 if (!replacement_op) {
233 goto cleanup;
234 }
235 }
236
237 /* We must unlink this op from the parent tree */
238
239 prev = op->common.parent->common.value.arg;
240 if (prev == op) {
241 /* This op is the first in the list */
242
243 if (replacement_op) {
244 replacement_op->common.parent = op->common.parent;
245 replacement_op->common.value.arg = NULL;
246 replacement_op->common.node = op->common.node;
247 op->common.parent->common.value.arg = replacement_op;
248 replacement_op->common.next = op->common.next;
249 }
250 else {
251 op->common.parent->common.value.arg = op->common.next;
252 }
253 }
254
255 /* Search the parent list */
256
257 else while (prev) {
258 /* Traverse all siblings in the parent's argument list */
259
260 next = prev->common.next;
261 if (next == op) {
262 if (replacement_op) {
263 replacement_op->common.parent = op->common.parent;
264 replacement_op->common.value.arg = NULL;
265 replacement_op->common.node = op->common.node;
266 prev->common.next = replacement_op;
267 replacement_op->common.next = op->common.next;
268 next = NULL;
269 }
270 else {
271 prev->common.next = op->common.next;
272 next = NULL;
273 }
274 }
275
276 prev = next;
277 }
278 }
279
280
281 cleanup:
282
283 /* Now we can actually delete the subtree rooted at op */
284
285 acpi_ps_delete_parse_tree (op);
286 return_VOID;
287 }
288
289
290 /*******************************************************************************
291 *
292 * FUNCTION: acpi_ps_next_parse_state
293 *
294 * PARAMETERS: parser_state - Current parser state object
295 *
296 * RETURN: Status
297 *
298 * DESCRIPTION: Update the parser state based upon the return exception from
299 * the parser callback.
300 *
301 ******************************************************************************/
302
303 acpi_status
304 acpi_ps_next_parse_state (
305 struct acpi_walk_state *walk_state,
306 union acpi_parse_object *op,
307 acpi_status callback_status)
308 {
309 struct acpi_parse_state *parser_state = &walk_state->parser_state;
310 acpi_status status = AE_CTRL_PENDING;
311
312
313 ACPI_FUNCTION_TRACE_PTR ("ps_next_parse_state", op);
314
315
316 switch (callback_status) {
317 case AE_CTRL_TERMINATE:
318
319 /*
320 * A control method was terminated via a RETURN statement.
321 * The walk of this method is complete.
322 */
323 parser_state->aml = parser_state->aml_end;
324 status = AE_CTRL_TERMINATE;
325 break;
326
327
328 case AE_CTRL_BREAK:
329
330 parser_state->aml = walk_state->aml_last_while;
331 walk_state->control_state->common.value = FALSE;
332 status = AE_CTRL_BREAK;
333 break;
334
335 case AE_CTRL_CONTINUE:
336
337
338 parser_state->aml = walk_state->aml_last_while;
339 status = AE_CTRL_CONTINUE;
340 break;
341
342 case AE_CTRL_PENDING:
343
344 parser_state->aml = walk_state->aml_last_while;
345 break;
346
347 #if 0
348 case AE_CTRL_SKIP:
349
350 parser_state->aml = parser_state->scope->parse_scope.pkg_end;
351 status = AE_OK;
352 break;
353 #endif
354
355 case AE_CTRL_TRUE:
356
357 /*
358 * Predicate of an IF was true, and we are at the matching ELSE.
359 * Just close out this package
360 */
361 parser_state->aml = acpi_ps_get_next_package_end (parser_state);
362 break;
363
364
365 case AE_CTRL_FALSE:
366
367 /*
368 * Either an IF/WHILE Predicate was false or we encountered a BREAK
369 * opcode. In both cases, we do not execute the rest of the
370 * package; We simply close out the parent (finishing the walk of
371 * this branch of the tree) and continue execution at the parent
372 * level.
373 */
374 parser_state->aml = parser_state->scope->parse_scope.pkg_end;
375
376 /* In the case of a BREAK, just force a predicate (if any) to FALSE */
377
378 walk_state->control_state->common.value = FALSE;
379 status = AE_CTRL_END;
380 break;
381
382
383 case AE_CTRL_TRANSFER:
384
385 /*
386 * A method call (invocation) -- transfer control
387 */
388 status = AE_CTRL_TRANSFER;
389 walk_state->prev_op = op;
390 walk_state->method_call_op = op;
391 walk_state->method_call_node = (op->common.value.arg)->common.node;
392
393 /* Will return value (if any) be used by the caller? */
394
395 walk_state->return_used = acpi_ds_is_result_used (op, walk_state);
396 break;
397
398
399 default:
400 status = callback_status;
401 if ((callback_status & AE_CODE_MASK) == AE_CODE_CONTROL) {
402 status = AE_OK;
403 }
404 break;
405 }
406
407 return_ACPI_STATUS (status);
408 }
409
410
411 /*******************************************************************************
412 *
413 * FUNCTION: acpi_ps_parse_loop
414 *
415 * PARAMETERS: parser_state - Current parser state object
416 *
417 * RETURN: Status
418 *
419 * DESCRIPTION: Parse AML (pointed to by the current parser state) and return
420 * a tree of ops.
421 *
422 ******************************************************************************/
423
424 acpi_status
425 acpi_ps_parse_loop (
426 struct acpi_walk_state *walk_state)
427 {
428 acpi_status status = AE_OK;
429 union acpi_parse_object *op = NULL; /* current op */
430 union acpi_parse_object *arg = NULL;
431 union acpi_parse_object *pre_op = NULL;
432 struct acpi_parse_state *parser_state;
433 u8 *aml_op_start = NULL;
434
435
436 ACPI_FUNCTION_TRACE_PTR ("ps_parse_loop", walk_state);
437
438 if (walk_state->descending_callback == NULL) {
439 return_ACPI_STATUS (AE_BAD_PARAMETER);
440 }
441
442 parser_state = &walk_state->parser_state;
443 walk_state->arg_types = 0;
444
445 #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
446 if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) {
447 /* We are restarting a preempted control method */
448
449 if (acpi_ps_has_completed_scope (parser_state)) {
450 /*
451 * We must check if a predicate to an IF or WHILE statement
452 * was just completed
453 */
454 if ((parser_state->scope->parse_scope.op) &&
455 ((parser_state->scope->parse_scope.op->common.aml_opcode == AML_IF_OP) ||
456 (parser_state->scope->parse_scope.op->common.aml_opcode == AML_WHILE_OP)) &&
457 (walk_state->control_state) &&
458 (walk_state->control_state->common.state ==
459 ACPI_CONTROL_PREDICATE_EXECUTING)) {
460 /*
461 * A predicate was just completed, get the value of the
462 * predicate and branch based on that value
463 */
464 walk_state->op = NULL;
465 status = acpi_ds_get_predicate_value (walk_state, ACPI_TO_POINTER (TRUE));
466 if (ACPI_FAILURE (status) &&
467 ((status & AE_CODE_MASK) != AE_CODE_CONTROL)) {
468 if (status == AE_AML_NO_RETURN_VALUE) {
469 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
470 "Invoked method did not return a value, %s\n",
471 acpi_format_exception (status)));
472
473 }
474 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "get_predicate Failed, %s\n",
475 acpi_format_exception (status)));
476 return_ACPI_STATUS (status);
477 }
478
479 status = acpi_ps_next_parse_state (walk_state, op, status);
480 }
481
482 acpi_ps_pop_scope (parser_state, &op,
483 &walk_state->arg_types, &walk_state->arg_count);
484 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped scope, Op=%p\n", op));
485 }
486 else if (walk_state->prev_op) {
487 /* We were in the middle of an op */
488
489 op = walk_state->prev_op;
490 walk_state->arg_types = walk_state->prev_arg_types;
491 }
492 }
493 #endif
494
495 /*
496 * Iterative parsing loop, while there is more aml to process:
497 */
498 while ((parser_state->aml < parser_state->aml_end) || (op)) {
499 aml_op_start = parser_state->aml;
500 if (!op) {
501 /* Get the next opcode from the AML stream */
502
503 walk_state->aml_offset = (u32) ACPI_PTR_DIFF (parser_state->aml,
504 parser_state->aml_start);
505 walk_state->opcode = acpi_ps_peek_opcode (parser_state);
506
507 /*
508 * First cut to determine what we have found:
509 * 1) A valid AML opcode
510 * 2) A name string
511 * 3) An unknown/invalid opcode
512 */
513 walk_state->op_info = acpi_ps_get_opcode_info (walk_state->opcode);
514 switch (walk_state->op_info->class) {
515 case AML_CLASS_ASCII:
516 case AML_CLASS_PREFIX:
517 /*
518 * Starts with a valid prefix or ASCII char, this is a name
519 * string. Convert the bare name string to a namepath.
520 */
521 walk_state->opcode = AML_INT_NAMEPATH_OP;
522 walk_state->arg_types = ARGP_NAMESTRING;
523 break;
524
525 case AML_CLASS_UNKNOWN:
526
527 /* The opcode is unrecognized. Just skip unknown opcodes */
528
529 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
530 "Found unknown opcode %X at AML address %p offset %X, ignoring\n",
531 walk_state->opcode, parser_state->aml, walk_state->aml_offset));
532
533 ACPI_DUMP_BUFFER (parser_state->aml, 128);
534
535 /* Assume one-byte bad opcode */
536
537 parser_state->aml++;
538 continue;
539
540 default:
541
542 /* Found opcode info, this is a normal opcode */
543
544 parser_state->aml += acpi_ps_get_opcode_size (walk_state->opcode);
545 walk_state->arg_types = walk_state->op_info->parse_args;
546 break;
547 }
548
549 /* Create Op structure and append to parent's argument list */
550
551 if (walk_state->op_info->flags & AML_NAMED) {
552 /* Allocate a new pre_op if necessary */
553
554 if (!pre_op) {
555 pre_op = acpi_ps_alloc_op (walk_state->opcode);
556 if (!pre_op) {
557 status = AE_NO_MEMORY;
558 goto close_this_op;
559 }
560 }
561
562 pre_op->common.value.arg = NULL;
563 pre_op->common.aml_opcode = walk_state->opcode;
564
565 /*
566 * Get and append arguments until we find the node that contains
567 * the name (the type ARGP_NAME).
568 */
569 while (GET_CURRENT_ARG_TYPE (walk_state->arg_types) &&
570 (GET_CURRENT_ARG_TYPE (walk_state->arg_types) != ARGP_NAME)) {
571 status = acpi_ps_get_next_arg (walk_state, parser_state,
572 GET_CURRENT_ARG_TYPE (walk_state->arg_types), &arg);
573 if (ACPI_FAILURE (status)) {
574 goto close_this_op;
575 }
576
577 acpi_ps_append_arg (pre_op, arg);
578 INCREMENT_ARG_LIST (walk_state->arg_types);
579 }
580
581 /* Make sure that we found a NAME and didn't run out of arguments */
582
583 if (!GET_CURRENT_ARG_TYPE (walk_state->arg_types)) {
584 status = AE_AML_NO_OPERAND;
585 goto close_this_op;
586 }
587
588 /* We know that this arg is a name, move to next arg */
589
590 INCREMENT_ARG_LIST (walk_state->arg_types);
591
592 /*
593 * Find the object. This will either insert the object into
594 * the namespace or simply look it up
595 */
596 walk_state->op = NULL;
597
598 status = walk_state->descending_callback (walk_state, &op);
599 if (ACPI_FAILURE (status)) {
600 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "During name lookup/catalog, %s\n",
601 acpi_format_exception (status)));
602 goto close_this_op;
603 }
604
605 if (op == NULL) {
606 continue;
607 }
608
609 status = acpi_ps_next_parse_state (walk_state, op, status);
610 if (status == AE_CTRL_PENDING) {
611 status = AE_OK;
612 goto close_this_op;
613 }
614
615 if (ACPI_FAILURE (status)) {
616 goto close_this_op;
617 }
618
619 acpi_ps_append_arg (op, pre_op->common.value.arg);
620 acpi_gbl_depth++;
621
622 if (op->common.aml_opcode == AML_REGION_OP) {
623 /*
624 * Defer final parsing of an operation_region body,
625 * because we don't have enough info in the first pass
626 * to parse it correctly (i.e., there may be method
627 * calls within the term_arg elements of the body.)
628 *
629 * However, we must continue parsing because
630 * the opregion is not a standalone package --
631 * we don't know where the end is at this point.
632 *
633 * (Length is unknown until parse of the body complete)
634 */
635 op->named.data = aml_op_start;
636 op->named.length = 0;
637 }
638 }
639 else {
640 /* Not a named opcode, just allocate Op and append to parent */
641
642 walk_state->op_info = acpi_ps_get_opcode_info (walk_state->opcode);
643 op = acpi_ps_alloc_op (walk_state->opcode);
644 if (!op) {
645 status = AE_NO_MEMORY;
646 goto close_this_op;
647 }
648
649 if (walk_state->op_info->flags & AML_CREATE) {
650 /*
651 * Backup to beginning of create_xXXfield declaration
652 * body_length is unknown until we parse the body
653 */
654 op->named.data = aml_op_start;
655 op->named.length = 0;
656 }
657
658 acpi_ps_append_arg (acpi_ps_get_parent_scope (parser_state), op);
659
660 if ((walk_state->descending_callback != NULL)) {
661 /*
662 * Find the object. This will either insert the object into
663 * the namespace or simply look it up
664 */
665 walk_state->op = op;
666
667 status = walk_state->descending_callback (walk_state, &op);
668 status = acpi_ps_next_parse_state (walk_state, op, status);
669 if (status == AE_CTRL_PENDING) {
670 status = AE_OK;
671 goto close_this_op;
672 }
673
674 if (ACPI_FAILURE (status)) {
675 goto close_this_op;
676 }
677 }
678 }
679
680 op->common.aml_offset = walk_state->aml_offset;
681
682 if (walk_state->op_info) {
683 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
684 "Opcode %4.4X [%s] Op %p Aml %p aml_offset %5.5X\n",
685 (u32) op->common.aml_opcode, walk_state->op_info->name,
686 op, parser_state->aml, op->common.aml_offset));
687 }
688 }
689
690
691 /* Start arg_count at zero because we don't know if there are any args yet */
692
693 walk_state->arg_count = 0;
694
695 if (walk_state->arg_types) /* Are there any arguments that must be processed? */ {
696 /* Get arguments */
697
698 switch (op->common.aml_opcode) {
699 case AML_BYTE_OP: /* AML_BYTEDATA_ARG */
700 case AML_WORD_OP: /* AML_WORDDATA_ARG */
701 case AML_DWORD_OP: /* AML_DWORDATA_ARG */
702 case AML_QWORD_OP: /* AML_QWORDATA_ARG */
703 case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */
704
705 /* Fill in constant or string argument directly */
706
707 acpi_ps_get_next_simple_arg (parser_state,
708 GET_CURRENT_ARG_TYPE (walk_state->arg_types), op);
709 break;
710
711 case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */
712
713 status = acpi_ps_get_next_namepath (walk_state, parser_state, op, 1);
714 if (ACPI_FAILURE (status)) {
715 goto close_this_op;
716 }
717
718 walk_state->arg_types = 0;
719 break;
720
721 default:
722
723 /* Op is not a constant or string, append each argument to the Op */
724
725 while (GET_CURRENT_ARG_TYPE (walk_state->arg_types) &&
726 !walk_state->arg_count) {
727 walk_state->aml_offset = (u32) ACPI_PTR_DIFF (parser_state->aml,
728 parser_state->aml_start);
729 status = acpi_ps_get_next_arg (walk_state, parser_state,
730 GET_CURRENT_ARG_TYPE (walk_state->arg_types), &arg);
731 if (ACPI_FAILURE (status)) {
732 goto close_this_op;
733 }
734
735 if (arg) {
736 arg->common.aml_offset = walk_state->aml_offset;
737 acpi_ps_append_arg (op, arg);
738 }
739 INCREMENT_ARG_LIST (walk_state->arg_types);
740 }
741
742 /* Special processing for certain opcodes */
743
744 switch (op->common.aml_opcode) {
745 case AML_METHOD_OP:
746
747 /*
748 * Skip parsing of control method
749 * because we don't have enough info in the first pass
750 * to parse it correctly.
751 *
752 * Save the length and address of the body
753 */
754 op->named.data = parser_state->aml;
755 op->named.length = (u32) (parser_state->pkg_end - parser_state->aml);
756
757 /* Skip body of method */
758
759 parser_state->aml = parser_state->pkg_end;
760 walk_state->arg_count = 0;
761 break;
762
763 case AML_BUFFER_OP:
764 case AML_PACKAGE_OP:
765 case AML_VAR_PACKAGE_OP:
766
767 if ((op->common.parent) &&
768 (op->common.parent->common.aml_opcode == AML_NAME_OP) &&
769 (walk_state->descending_callback != acpi_ds_exec_begin_op)) {
770 /*
771 * Skip parsing of Buffers and Packages
772 * because we don't have enough info in the first pass
773 * to parse them correctly.
774 */
775 op->named.data = aml_op_start;
776 op->named.length = (u32) (parser_state->pkg_end - aml_op_start);
777
778 /* Skip body */
779
780 parser_state->aml = parser_state->pkg_end;
781 walk_state->arg_count = 0;
782 }
783 break;
784
785 case AML_WHILE_OP:
786
787 if (walk_state->control_state) {
788 walk_state->control_state->control.package_end = parser_state->pkg_end;
789 }
790 break;
791
792 default:
793
794 /* No action for all other opcodes */
795 break;
796 }
797 break;
798 }
799 }
800
801 /* Check for arguments that need to be processed */
802
803 if (walk_state->arg_count) {
804 /* There are arguments (complex ones), push Op and prepare for argument */
805
806 status = acpi_ps_push_scope (parser_state, op,
807 walk_state->arg_types, walk_state->arg_count);
808 if (ACPI_FAILURE (status)) {
809 goto close_this_op;
810 }
811 op = NULL;
812 continue;
813 }
814
815 /* All arguments have been processed -- Op is complete, prepare for next */
816
817 walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
818 if (walk_state->op_info->flags & AML_NAMED) {
819 if (acpi_gbl_depth) {
820 acpi_gbl_depth--;
821 }
822
823 if (op->common.aml_opcode == AML_REGION_OP) {
824 /*
825 * Skip parsing of control method or opregion body,
826 * because we don't have enough info in the first pass
827 * to parse them correctly.
828 *
829 * Completed parsing an op_region declaration, we now
830 * know the length.
831 */
832 op->named.length = (u32) (parser_state->aml - op->named.data);
833 }
834 }
835
836 if (walk_state->op_info->flags & AML_CREATE) {
837 /*
838 * Backup to beginning of create_xXXfield declaration (1 for
839 * Opcode)
840 *
841 * body_length is unknown until we parse the body
842 */
843 op->named.length = (u32) (parser_state->aml - op->named.data);
844 }
845
846 /* This op complete, notify the dispatcher */
847
848 if (walk_state->ascending_callback != NULL) {
849 walk_state->op = op;
850 walk_state->opcode = op->common.aml_opcode;
851
852 status = walk_state->ascending_callback (walk_state);
853 status = acpi_ps_next_parse_state (walk_state, op, status);
854 if (status == AE_CTRL_PENDING) {
855 status = AE_OK;
856 goto close_this_op;
857 }
858 }
859
860
861 close_this_op:
862 /*
863 * Finished one argument of the containing scope
864 */
865 parser_state->scope->parse_scope.arg_count--;
866
867 /* Close this Op (will result in parse subtree deletion) */
868
869 acpi_ps_complete_this_op (walk_state, op);
870 op = NULL;
871 if (pre_op) {
872 acpi_ps_free_op (pre_op);
873 pre_op = NULL;
874 }
875
876 switch (status) {
877 case AE_OK:
878 break;
879
880
881 case AE_CTRL_TRANSFER:
882
883 /*
884 * We are about to transfer to a called method.
885 */
886 walk_state->prev_op = op;
887 walk_state->prev_arg_types = walk_state->arg_types;
888 return_ACPI_STATUS (status);
889
890
891 case AE_CTRL_END:
892
893 acpi_ps_pop_scope (parser_state, &op,
894 &walk_state->arg_types, &walk_state->arg_count);
895
896 if (op) {
897 walk_state->op = op;
898 walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
899 walk_state->opcode = op->common.aml_opcode;
900
901 status = walk_state->ascending_callback (walk_state);
902 status = acpi_ps_next_parse_state (walk_state, op, status);
903
904 acpi_ps_complete_this_op (walk_state, op);
905 op = NULL;
906 }
907 status = AE_OK;
908 break;
909
910
911 case AE_CTRL_BREAK:
912 case AE_CTRL_CONTINUE:
913
914 /* Pop off scopes until we find the While */
915
916 while (!op || (op->common.aml_opcode != AML_WHILE_OP)) {
917 acpi_ps_pop_scope (parser_state, &op,
918 &walk_state->arg_types, &walk_state->arg_count);
919 }
920
921 /* Close this iteration of the While loop */
922
923 walk_state->op = op;
924 walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
925 walk_state->opcode = op->common.aml_opcode;
926
927 status = walk_state->ascending_callback (walk_state);
928 status = acpi_ps_next_parse_state (walk_state, op, status);
929
930 acpi_ps_complete_this_op (walk_state, op);
931 op = NULL;
932
933 status = AE_OK;
934 break;
935
936
937 case AE_CTRL_TERMINATE:
938
939 status = AE_OK;
940
941 /* Clean up */
942 do {
943 if (op) {
944 acpi_ps_complete_this_op (walk_state, op);
945 }
946 acpi_ps_pop_scope (parser_state, &op,
947 &walk_state->arg_types, &walk_state->arg_count);
948
949 } while (op);
950
951 return_ACPI_STATUS (status);
952
953
954 default: /* All other non-AE_OK status */
955
956 do {
957 if (op) {
958 acpi_ps_complete_this_op (walk_state, op);
959 }
960 acpi_ps_pop_scope (parser_state, &op,
961 &walk_state->arg_types, &walk_state->arg_count);
962
963 } while (op);
964
965
966 /*
967 * TBD: Cleanup parse ops on error
968 */
969 #if 0
970 if (op == NULL) {
971 acpi_ps_pop_scope (parser_state, &op,
972 &walk_state->arg_types, &walk_state->arg_count);
973 }
974 #endif
975 walk_state->prev_op = op;
976 walk_state->prev_arg_types = walk_state->arg_types;
977 return_ACPI_STATUS (status);
978 }
979
980 /* This scope complete? */
981
982 if (acpi_ps_has_completed_scope (parser_state)) {
983 acpi_ps_pop_scope (parser_state, &op,
984 &walk_state->arg_types, &walk_state->arg_count);
985 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped scope, Op=%p\n", op));
986 }
987 else {
988 op = NULL;
989 }
990
991 } /* while parser_state->Aml */
992
993
994 /*
995 * Complete the last Op (if not completed), and clear the scope stack.
996 * It is easily possible to end an AML "package" with an unbounded number
997 * of open scopes (such as when several ASL blocks are closed with
998 * sequential closing braces). We want to terminate each one cleanly.
999 */
1000 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "AML package complete at Op %p\n", op));
1001 do {
1002 if (op) {
1003 if (walk_state->ascending_callback != NULL) {
1004 walk_state->op = op;
1005 walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
1006 walk_state->opcode = op->common.aml_opcode;
1007
1008 status = walk_state->ascending_callback (walk_state);
1009 status = acpi_ps_next_parse_state (walk_state, op, status);
1010 if (status == AE_CTRL_PENDING) {
1011 status = AE_OK;
1012 goto close_this_op;
1013 }
1014
1015 if (status == AE_CTRL_TERMINATE) {
1016 status = AE_OK;
1017
1018 /* Clean up */
1019 do {
1020 if (op) {
1021 acpi_ps_complete_this_op (walk_state, op);
1022 }
1023
1024 acpi_ps_pop_scope (parser_state, &op,
1025 &walk_state->arg_types, &walk_state->arg_count);
1026
1027 } while (op);
1028
1029 return_ACPI_STATUS (status);
1030 }
1031
1032 else if (ACPI_FAILURE (status)) {
1033 acpi_ps_complete_this_op (walk_state, op);
1034 return_ACPI_STATUS (status);
1035 }
1036 }
1037
1038 acpi_ps_complete_this_op (walk_state, op);
1039 }
1040
1041 acpi_ps_pop_scope (parser_state, &op, &walk_state->arg_types,
1042 &walk_state->arg_count);
1043
1044 } while (op);
1045
1046 return_ACPI_STATUS (status);
1047 }
1048
1049
1050 /*******************************************************************************
1051 *
1052 * FUNCTION: acpi_ps_parse_aml
1053 *
1054 * PARAMETERS: start_scope - The starting point of the parse. Becomes the
1055 * root of the parsed op tree.
1056 * Aml - Pointer to the raw AML code to parse
1057 * aml_size - Length of the AML to parse
1058 *
1059 *
1060 * RETURN: Status
1061 *
1062 * DESCRIPTION: Parse raw AML and return a tree of ops
1063 *
1064 ******************************************************************************/
1065
1066 acpi_status
1067 acpi_ps_parse_aml (
1068 struct acpi_walk_state *walk_state)
1069 {
1070 acpi_status status;
1071 acpi_status terminate_status;
1072 struct acpi_thread_state *thread;
1073 struct acpi_thread_state *prev_walk_list = acpi_gbl_current_walk_list;
1074 struct acpi_walk_state *previous_walk_state;
1075
1076
1077 ACPI_FUNCTION_TRACE ("ps_parse_aml");
1078
1079 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Entered with walk_state=%p Aml=%p size=%X\n",
1080 walk_state, walk_state->parser_state.aml, walk_state->parser_state.aml_size));
1081
1082
1083 /* Create and initialize a new thread state */
1084
1085 thread = acpi_ut_create_thread_state ();
1086 if (!thread) {
1087 return_ACPI_STATUS (AE_NO_MEMORY);
1088 }
1089
1090 walk_state->thread = thread;
1091 acpi_ds_push_walk_state (walk_state, thread);
1092
1093 /*
1094 * This global allows the AML debugger to get a handle to the currently
1095 * executing control method.
1096 */
1097 acpi_gbl_current_walk_list = thread;
1098
1099 /*
1100 * Execute the walk loop as long as there is a valid Walk State. This
1101 * handles nested control method invocations without recursion.
1102 */
1103 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "State=%p\n", walk_state));
1104
1105 status = AE_OK;
1106 while (walk_state) {
1107 if (ACPI_SUCCESS (status)) {
1108 /*
1109 * The parse_loop executes AML until the method terminates
1110 * or calls another method.
1111 */
1112 status = acpi_ps_parse_loop (walk_state);
1113 }
1114
1115 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE,
1116 "Completed one call to walk loop, %s State=%p\n",
1117 acpi_format_exception (status), walk_state));
1118
1119 if (status == AE_CTRL_TRANSFER) {
1120 /*
1121 * A method call was detected.
1122 * Transfer control to the called control method
1123 */
1124 status = acpi_ds_call_control_method (thread, walk_state, NULL);
1125
1126 /*
1127 * If the transfer to the new method method call worked, a new walk
1128 * state was created -- get it
1129 */
1130 walk_state = acpi_ds_get_current_walk_state (thread);
1131 continue;
1132 }
1133 else if (status == AE_CTRL_TERMINATE) {
1134 status = AE_OK;
1135 }
1136 else if ((status != AE_OK) && (walk_state->method_desc)) {
1137 ACPI_REPORT_METHOD_ERROR ("Method execution failed",
1138 walk_state->method_node, NULL, status);
1139
1140 /* Check for possible multi-thread reentrancy problem */
1141
1142 if ((status == AE_ALREADY_EXISTS) &&
1143 (!walk_state->method_desc->method.semaphore)) {
1144 /*
1145 * This method is marked not_serialized, but it tried to create a named
1146 * object, causing the second thread entrance to fail. We will workaround
1147 * this by marking the method permanently as Serialized.
1148 */
1149 walk_state->method_desc->method.method_flags |= AML_METHOD_SERIALIZED;
1150 walk_state->method_desc->method.concurrency = 1;
1151 }
1152 }
1153
1154 if (walk_state->method_desc) {
1155 /* Decrement the thread count on the method parse tree */
1156
1157 if (walk_state->method_desc->method.thread_count) {
1158 walk_state->method_desc->method.thread_count--;
1159 }
1160 }
1161
1162 /* We are done with this walk, move on to the parent if any */
1163
1164 walk_state = acpi_ds_pop_walk_state (thread);
1165
1166 /* Reset the current scope to the beginning of scope stack */
1167
1168 acpi_ds_scope_stack_clear (walk_state);
1169
1170 /*
1171 * If we just returned from the execution of a control method,
1172 * there's lots of cleanup to do
1173 */
1174 if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) == ACPI_PARSE_EXECUTE) {
1175 terminate_status = acpi_ds_terminate_control_method (walk_state);
1176 if (ACPI_FAILURE (terminate_status)) {
1177 ACPI_REPORT_ERROR ((
1178 "Could not terminate control method properly\n"));
1179
1180 /* Ignore error and continue */
1181 }
1182 }
1183
1184 /* Delete this walk state and all linked control states */
1185
1186 acpi_ps_cleanup_scope (&walk_state->parser_state);
1187
1188 previous_walk_state = walk_state;
1189
1190 ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "return_value=%p, implicit_value=%p State=%p\n",
1191 walk_state->return_desc, walk_state->implicit_return_obj, walk_state));
1192
1193 /* Check if we have restarted a preempted walk */
1194
1195 walk_state = acpi_ds_get_current_walk_state (thread);
1196 if (walk_state) {
1197 if (ACPI_SUCCESS (status)) {
1198 /*
1199 * There is another walk state, restart it.
1200 * If the method return value is not used by the parent,
1201 * The object is deleted
1202 */
1203 if (!previous_walk_state->return_desc) {
1204 status = acpi_ds_restart_control_method (walk_state,
1205 previous_walk_state->implicit_return_obj);
1206 }
1207 else {
1208 /*
1209 * We have a valid return value, delete any implicit
1210 * return value.
1211 */
1212 acpi_ds_clear_implicit_return (previous_walk_state);
1213
1214 status = acpi_ds_restart_control_method (walk_state,
1215 previous_walk_state->return_desc);
1216 }
1217 if (ACPI_SUCCESS (status)) {
1218 walk_state->walk_type |= ACPI_WALK_METHOD_RESTART;
1219 }
1220 }
1221 else {
1222 /* On error, delete any return object */
1223
1224 acpi_ut_remove_reference (previous_walk_state->return_desc);
1225 }
1226 }
1227
1228 /*
1229 * Just completed a 1st-level method, save the final internal return
1230 * value (if any)
1231 */
1232 else if (previous_walk_state->caller_return_desc) {
1233 if (previous_walk_state->implicit_return_obj) {
1234 *(previous_walk_state->caller_return_desc) = previous_walk_state->implicit_return_obj;
1235 }
1236 else {
1237 /* NULL if no return value */
1238
1239 *(previous_walk_state->caller_return_desc) = previous_walk_state->return_desc;
1240 }
1241 }
1242 else {
1243 if (previous_walk_state->return_desc) {
1244 /* Caller doesn't want it, must delete it */
1245
1246 acpi_ut_remove_reference (previous_walk_state->return_desc);
1247 }
1248 if (previous_walk_state->implicit_return_obj) {
1249 /* Caller doesn't want it, must delete it */
1250
1251 acpi_ut_remove_reference (previous_walk_state->implicit_return_obj);
1252 }
1253 }
1254
1255 acpi_ds_delete_walk_state (previous_walk_state);
1256 }
1257
1258 /* Normal exit */
1259
1260 acpi_ex_release_all_mutexes (thread);
1261 acpi_ut_delete_generic_state (ACPI_CAST_PTR (union acpi_generic_state, thread));
1262 acpi_gbl_current_walk_list = prev_walk_list;
1263 return_ACPI_STATUS (status);
1264 }
1265
1266
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