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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: psparse - Parser top level AML parse routines | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
4a90c7e8 | 8 | * Copyright (C) 2000 - 2006, R. Byron Moore |
1da177e4 LT |
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 | ||
1da177e4 LT |
44 | /* |
45 | * Parse the AML and build an operation tree as most interpreters, | |
46 | * like Perl, do. Parsing is done by hand rather than with a YACC | |
47 | * generated parser to tightly constrain stack and dynamic memory | |
48 | * usage. At the same time, parsing is kept flexible and the code | |
49 | * fairly compact by parsing based on a list of AML opcode | |
50 | * templates in aml_op_info[] | |
51 | */ | |
52 | ||
53 | #include <acpi/acpi.h> | |
54 | #include <acpi/acparser.h> | |
55 | #include <acpi/acdispat.h> | |
56 | #include <acpi/amlcode.h> | |
57 | #include <acpi/acnamesp.h> | |
58 | #include <acpi/acinterp.h> | |
59 | ||
60 | #define _COMPONENT ACPI_PARSER | |
4be44fcd | 61 | ACPI_MODULE_NAME("psparse") |
1da177e4 | 62 | |
1da177e4 LT |
63 | /******************************************************************************* |
64 | * | |
65 | * FUNCTION: acpi_ps_get_opcode_size | |
66 | * | |
67 | * PARAMETERS: Opcode - An AML opcode | |
68 | * | |
69 | * RETURN: Size of the opcode, in bytes (1 or 2) | |
70 | * | |
71 | * DESCRIPTION: Get the size of the current opcode. | |
72 | * | |
73 | ******************************************************************************/ | |
4be44fcd | 74 | u32 acpi_ps_get_opcode_size(u32 opcode) |
1da177e4 LT |
75 | { |
76 | ||
77 | /* Extended (2-byte) opcode if > 255 */ | |
78 | ||
79 | if (opcode > 0x00FF) { | |
80 | return (2); | |
81 | } | |
82 | ||
83 | /* Otherwise, just a single byte opcode */ | |
84 | ||
85 | return (1); | |
86 | } | |
87 | ||
1da177e4 LT |
88 | /******************************************************************************* |
89 | * | |
90 | * FUNCTION: acpi_ps_peek_opcode | |
91 | * | |
92 | * PARAMETERS: parser_state - A parser state object | |
93 | * | |
44f6c012 | 94 | * RETURN: Next AML opcode |
1da177e4 LT |
95 | * |
96 | * DESCRIPTION: Get next AML opcode (without incrementing AML pointer) | |
97 | * | |
98 | ******************************************************************************/ | |
99 | ||
4be44fcd | 100 | u16 acpi_ps_peek_opcode(struct acpi_parse_state * parser_state) |
1da177e4 | 101 | { |
4be44fcd LB |
102 | u8 *aml; |
103 | u16 opcode; | |
1da177e4 LT |
104 | |
105 | aml = parser_state->aml; | |
4be44fcd | 106 | opcode = (u16) ACPI_GET8(aml); |
1da177e4 | 107 | |
73459f73 | 108 | if (opcode == AML_EXTENDED_OP_PREFIX) { |
52fc0b02 | 109 | |
73459f73 | 110 | /* Extended opcode, get the second opcode byte */ |
1da177e4 LT |
111 | |
112 | aml++; | |
4be44fcd | 113 | opcode = (u16) ((opcode << 8) | ACPI_GET8(aml)); |
1da177e4 LT |
114 | } |
115 | ||
116 | return (opcode); | |
117 | } | |
118 | ||
1da177e4 LT |
119 | /******************************************************************************* |
120 | * | |
121 | * FUNCTION: acpi_ps_complete_this_op | |
122 | * | |
123 | * PARAMETERS: walk_state - Current State | |
124 | * Op - Op to complete | |
125 | * | |
88ac00f5 | 126 | * RETURN: Status |
1da177e4 LT |
127 | * |
128 | * DESCRIPTION: Perform any cleanup at the completion of an Op. | |
129 | * | |
130 | ******************************************************************************/ | |
131 | ||
73459f73 | 132 | acpi_status |
4be44fcd LB |
133 | acpi_ps_complete_this_op(struct acpi_walk_state * walk_state, |
134 | union acpi_parse_object * op) | |
1da177e4 | 135 | { |
4be44fcd LB |
136 | union acpi_parse_object *prev; |
137 | union acpi_parse_object *next; | |
138 | const struct acpi_opcode_info *parent_info; | |
139 | union acpi_parse_object *replacement_op = NULL; | |
1da177e4 | 140 | |
b229cf92 | 141 | ACPI_FUNCTION_TRACE_PTR(ps_complete_this_op, op); |
1da177e4 LT |
142 | |
143 | /* Check for null Op, can happen if AML code is corrupt */ | |
144 | ||
145 | if (!op) { | |
4be44fcd | 146 | return_ACPI_STATUS(AE_OK); /* OK for now */ |
1da177e4 LT |
147 | } |
148 | ||
149 | /* Delete this op and the subtree below it if asked to */ | |
150 | ||
4be44fcd LB |
151 | if (((walk_state->parse_flags & ACPI_PARSE_TREE_MASK) != |
152 | ACPI_PARSE_DELETE_TREE) | |
153 | || (walk_state->op_info->class == AML_CLASS_ARGUMENT)) { | |
154 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
155 | } |
156 | ||
157 | /* Make sure that we only delete this subtree */ | |
158 | ||
159 | if (op->common.parent) { | |
88ac00f5 RM |
160 | prev = op->common.parent->common.value.arg; |
161 | if (!prev) { | |
52fc0b02 | 162 | |
88ac00f5 RM |
163 | /* Nothing more to do */ |
164 | ||
165 | goto cleanup; | |
166 | } | |
167 | ||
1da177e4 LT |
168 | /* |
169 | * Check if we need to replace the operator and its subtree | |
170 | * with a return value op (placeholder op) | |
171 | */ | |
4be44fcd LB |
172 | parent_info = |
173 | acpi_ps_get_opcode_info(op->common.parent->common. | |
174 | aml_opcode); | |
1da177e4 LT |
175 | |
176 | switch (parent_info->class) { | |
177 | case AML_CLASS_CONTROL: | |
178 | break; | |
179 | ||
180 | case AML_CLASS_CREATE: | |
181 | ||
182 | /* | |
183 | * These opcodes contain term_arg operands. The current | |
184 | * op must be replaced by a placeholder return op | |
185 | */ | |
4be44fcd LB |
186 | replacement_op = |
187 | acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP); | |
1da177e4 | 188 | if (!replacement_op) { |
88ac00f5 | 189 | goto allocate_error; |
1da177e4 LT |
190 | } |
191 | break; | |
192 | ||
193 | case AML_CLASS_NAMED_OBJECT: | |
194 | ||
195 | /* | |
196 | * These opcodes contain term_arg operands. The current | |
197 | * op must be replaced by a placeholder return op | |
198 | */ | |
4be44fcd LB |
199 | if ((op->common.parent->common.aml_opcode == |
200 | AML_REGION_OP) | |
201 | || (op->common.parent->common.aml_opcode == | |
202 | AML_DATA_REGION_OP) | |
203 | || (op->common.parent->common.aml_opcode == | |
204 | AML_BUFFER_OP) | |
205 | || (op->common.parent->common.aml_opcode == | |
206 | AML_PACKAGE_OP) | |
207 | || (op->common.parent->common.aml_opcode == | |
208 | AML_VAR_PACKAGE_OP)) { | |
209 | replacement_op = | |
210 | acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP); | |
1da177e4 | 211 | if (!replacement_op) { |
88ac00f5 | 212 | goto allocate_error; |
1da177e4 | 213 | } |
4be44fcd LB |
214 | } else |
215 | if ((op->common.parent->common.aml_opcode == | |
216 | AML_NAME_OP) | |
217 | && (walk_state->pass_number <= | |
218 | ACPI_IMODE_LOAD_PASS2)) { | |
219 | if ((op->common.aml_opcode == AML_BUFFER_OP) | |
220 | || (op->common.aml_opcode == AML_PACKAGE_OP) | |
221 | || (op->common.aml_opcode == | |
222 | AML_VAR_PACKAGE_OP)) { | |
223 | replacement_op = | |
224 | acpi_ps_alloc_op(op->common. | |
225 | aml_opcode); | |
1da177e4 | 226 | if (!replacement_op) { |
88ac00f5 | 227 | goto allocate_error; |
1da177e4 LT |
228 | } |
229 | ||
4be44fcd LB |
230 | replacement_op->named.data = |
231 | op->named.data; | |
232 | replacement_op->named.length = | |
233 | op->named.length; | |
1da177e4 LT |
234 | } |
235 | } | |
236 | break; | |
237 | ||
238 | default: | |
88ac00f5 | 239 | |
4be44fcd LB |
240 | replacement_op = |
241 | acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP); | |
1da177e4 | 242 | if (!replacement_op) { |
88ac00f5 | 243 | goto allocate_error; |
1da177e4 LT |
244 | } |
245 | } | |
246 | ||
247 | /* We must unlink this op from the parent tree */ | |
248 | ||
1da177e4 | 249 | if (prev == op) { |
52fc0b02 | 250 | |
1da177e4 LT |
251 | /* This op is the first in the list */ |
252 | ||
253 | if (replacement_op) { | |
4be44fcd LB |
254 | replacement_op->common.parent = |
255 | op->common.parent; | |
256 | replacement_op->common.value.arg = NULL; | |
257 | replacement_op->common.node = op->common.node; | |
258 | op->common.parent->common.value.arg = | |
259 | replacement_op; | |
260 | replacement_op->common.next = op->common.next; | |
261 | } else { | |
262 | op->common.parent->common.value.arg = | |
263 | op->common.next; | |
1da177e4 LT |
264 | } |
265 | } | |
266 | ||
267 | /* Search the parent list */ | |
268 | ||
4be44fcd LB |
269 | else |
270 | while (prev) { | |
52fc0b02 | 271 | |
4be44fcd LB |
272 | /* Traverse all siblings in the parent's argument list */ |
273 | ||
274 | next = prev->common.next; | |
275 | if (next == op) { | |
276 | if (replacement_op) { | |
277 | replacement_op->common.parent = | |
278 | op->common.parent; | |
279 | replacement_op->common.value. | |
280 | arg = NULL; | |
281 | replacement_op->common.node = | |
282 | op->common.node; | |
283 | prev->common.next = | |
284 | replacement_op; | |
285 | replacement_op->common.next = | |
286 | op->common.next; | |
287 | next = NULL; | |
288 | } else { | |
289 | prev->common.next = | |
290 | op->common.next; | |
291 | next = NULL; | |
292 | } | |
1da177e4 | 293 | } |
4be44fcd | 294 | prev = next; |
1da177e4 | 295 | } |
1da177e4 LT |
296 | } |
297 | ||
4be44fcd | 298 | cleanup: |
1da177e4 | 299 | |
44f6c012 | 300 | /* Now we can actually delete the subtree rooted at Op */ |
1da177e4 | 301 | |
4be44fcd LB |
302 | acpi_ps_delete_parse_tree(op); |
303 | return_ACPI_STATUS(AE_OK); | |
88ac00f5 | 304 | |
4be44fcd | 305 | allocate_error: |
88ac00f5 RM |
306 | |
307 | /* Always delete the subtree, even on error */ | |
308 | ||
4be44fcd LB |
309 | acpi_ps_delete_parse_tree(op); |
310 | return_ACPI_STATUS(AE_NO_MEMORY); | |
1da177e4 LT |
311 | } |
312 | ||
1da177e4 LT |
313 | /******************************************************************************* |
314 | * | |
315 | * FUNCTION: acpi_ps_next_parse_state | |
316 | * | |
44f6c012 RM |
317 | * PARAMETERS: walk_state - Current state |
318 | * Op - Current parse op | |
319 | * callback_status - Status from previous operation | |
1da177e4 LT |
320 | * |
321 | * RETURN: Status | |
322 | * | |
323 | * DESCRIPTION: Update the parser state based upon the return exception from | |
324 | * the parser callback. | |
325 | * | |
326 | ******************************************************************************/ | |
327 | ||
73459f73 | 328 | acpi_status |
4be44fcd LB |
329 | acpi_ps_next_parse_state(struct acpi_walk_state *walk_state, |
330 | union acpi_parse_object *op, | |
331 | acpi_status callback_status) | |
1da177e4 | 332 | { |
4be44fcd LB |
333 | struct acpi_parse_state *parser_state = &walk_state->parser_state; |
334 | acpi_status status = AE_CTRL_PENDING; | |
1da177e4 | 335 | |
b229cf92 | 336 | ACPI_FUNCTION_TRACE_PTR(ps_next_parse_state, op); |
1da177e4 LT |
337 | |
338 | switch (callback_status) { | |
339 | case AE_CTRL_TERMINATE: | |
1da177e4 LT |
340 | /* |
341 | * A control method was terminated via a RETURN statement. | |
342 | * The walk of this method is complete. | |
343 | */ | |
344 | parser_state->aml = parser_state->aml_end; | |
345 | status = AE_CTRL_TERMINATE; | |
346 | break; | |
347 | ||
1da177e4 LT |
348 | case AE_CTRL_BREAK: |
349 | ||
350 | parser_state->aml = walk_state->aml_last_while; | |
351 | walk_state->control_state->common.value = FALSE; | |
defba1d8 BM |
352 | status = acpi_ds_result_stack_pop(walk_state); |
353 | if (ACPI_SUCCESS(status)) { | |
354 | status = AE_CTRL_BREAK; | |
355 | } | |
1da177e4 LT |
356 | break; |
357 | ||
358 | case AE_CTRL_CONTINUE: | |
359 | ||
1da177e4 | 360 | parser_state->aml = walk_state->aml_last_while; |
defba1d8 BM |
361 | status = acpi_ds_result_stack_pop(walk_state); |
362 | if (ACPI_SUCCESS(status)) { | |
363 | status = AE_CTRL_CONTINUE; | |
364 | } | |
1da177e4 LT |
365 | break; |
366 | ||
367 | case AE_CTRL_PENDING: | |
368 | ||
369 | parser_state->aml = walk_state->aml_last_while; | |
370 | break; | |
371 | ||
372 | #if 0 | |
373 | case AE_CTRL_SKIP: | |
374 | ||
375 | parser_state->aml = parser_state->scope->parse_scope.pkg_end; | |
376 | status = AE_OK; | |
377 | break; | |
378 | #endif | |
379 | ||
380 | case AE_CTRL_TRUE: | |
1da177e4 LT |
381 | /* |
382 | * Predicate of an IF was true, and we are at the matching ELSE. | |
383 | * Just close out this package | |
384 | */ | |
4be44fcd | 385 | parser_state->aml = acpi_ps_get_next_package_end(parser_state); |
defba1d8 BM |
386 | status = acpi_ds_result_stack_pop(walk_state); |
387 | if (ACPI_SUCCESS(status)) { | |
388 | status = AE_CTRL_PENDING; | |
389 | } | |
1da177e4 LT |
390 | break; |
391 | ||
1da177e4 | 392 | case AE_CTRL_FALSE: |
1da177e4 LT |
393 | /* |
394 | * Either an IF/WHILE Predicate was false or we encountered a BREAK | |
395 | * opcode. In both cases, we do not execute the rest of the | |
396 | * package; We simply close out the parent (finishing the walk of | |
397 | * this branch of the tree) and continue execution at the parent | |
398 | * level. | |
399 | */ | |
400 | parser_state->aml = parser_state->scope->parse_scope.pkg_end; | |
401 | ||
402 | /* In the case of a BREAK, just force a predicate (if any) to FALSE */ | |
403 | ||
404 | walk_state->control_state->common.value = FALSE; | |
405 | status = AE_CTRL_END; | |
406 | break; | |
407 | ||
1da177e4 LT |
408 | case AE_CTRL_TRANSFER: |
409 | ||
44f6c012 RM |
410 | /* A method call (invocation) -- transfer control */ |
411 | ||
1da177e4 LT |
412 | status = AE_CTRL_TRANSFER; |
413 | walk_state->prev_op = op; | |
414 | walk_state->method_call_op = op; | |
4be44fcd LB |
415 | walk_state->method_call_node = |
416 | (op->common.value.arg)->common.node; | |
1da177e4 LT |
417 | |
418 | /* Will return value (if any) be used by the caller? */ | |
419 | ||
4be44fcd LB |
420 | walk_state->return_used = |
421 | acpi_ds_is_result_used(op, walk_state); | |
1da177e4 LT |
422 | break; |
423 | ||
1da177e4 | 424 | default: |
44f6c012 | 425 | |
1da177e4 LT |
426 | status = callback_status; |
427 | if ((callback_status & AE_CODE_MASK) == AE_CODE_CONTROL) { | |
428 | status = AE_OK; | |
429 | } | |
430 | break; | |
431 | } | |
432 | ||
4be44fcd | 433 | return_ACPI_STATUS(status); |
1da177e4 LT |
434 | } |
435 | ||
1da177e4 LT |
436 | /******************************************************************************* |
437 | * | |
438 | * FUNCTION: acpi_ps_parse_aml | |
439 | * | |
44f6c012 | 440 | * PARAMETERS: walk_state - Current state |
1da177e4 LT |
441 | * |
442 | * | |
443 | * RETURN: Status | |
444 | * | |
445 | * DESCRIPTION: Parse raw AML and return a tree of ops | |
446 | * | |
447 | ******************************************************************************/ | |
448 | ||
4be44fcd | 449 | acpi_status acpi_ps_parse_aml(struct acpi_walk_state *walk_state) |
1da177e4 | 450 | { |
4be44fcd | 451 | acpi_status status; |
4be44fcd LB |
452 | struct acpi_thread_state *thread; |
453 | struct acpi_thread_state *prev_walk_list = acpi_gbl_current_walk_list; | |
454 | struct acpi_walk_state *previous_walk_state; | |
1da177e4 | 455 | |
b229cf92 | 456 | ACPI_FUNCTION_TRACE(ps_parse_aml); |
1da177e4 | 457 | |
4be44fcd | 458 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
b229cf92 | 459 | "Entered with WalkState=%p Aml=%p size=%X\n", |
4be44fcd LB |
460 | walk_state, walk_state->parser_state.aml, |
461 | walk_state->parser_state.aml_size)); | |
1da177e4 LT |
462 | |
463 | /* Create and initialize a new thread state */ | |
464 | ||
4be44fcd | 465 | thread = acpi_ut_create_thread_state(); |
1da177e4 | 466 | if (!thread) { |
4119532c | 467 | acpi_ds_delete_walk_state(walk_state); |
4be44fcd | 468 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
469 | } |
470 | ||
471 | walk_state->thread = thread; | |
967440e3 BM |
472 | |
473 | /* | |
474 | * If executing a method, the starting sync_level is this method's | |
475 | * sync_level | |
476 | */ | |
477 | if (walk_state->method_desc) { | |
478 | walk_state->thread->current_sync_level = | |
479 | walk_state->method_desc->method.sync_level; | |
480 | } | |
481 | ||
4be44fcd | 482 | acpi_ds_push_walk_state(walk_state, thread); |
1da177e4 LT |
483 | |
484 | /* | |
485 | * This global allows the AML debugger to get a handle to the currently | |
486 | * executing control method. | |
487 | */ | |
488 | acpi_gbl_current_walk_list = thread; | |
489 | ||
490 | /* | |
491 | * Execute the walk loop as long as there is a valid Walk State. This | |
492 | * handles nested control method invocations without recursion. | |
493 | */ | |
4be44fcd | 494 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "State=%p\n", walk_state)); |
1da177e4 LT |
495 | |
496 | status = AE_OK; | |
497 | while (walk_state) { | |
4be44fcd | 498 | if (ACPI_SUCCESS(status)) { |
1da177e4 LT |
499 | /* |
500 | * The parse_loop executes AML until the method terminates | |
501 | * or calls another method. | |
502 | */ | |
4be44fcd | 503 | status = acpi_ps_parse_loop(walk_state); |
1da177e4 LT |
504 | } |
505 | ||
4be44fcd LB |
506 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
507 | "Completed one call to walk loop, %s State=%p\n", | |
508 | acpi_format_exception(status), walk_state)); | |
1da177e4 LT |
509 | |
510 | if (status == AE_CTRL_TRANSFER) { | |
511 | /* | |
512 | * A method call was detected. | |
513 | * Transfer control to the called control method | |
514 | */ | |
4be44fcd LB |
515 | status = |
516 | acpi_ds_call_control_method(thread, walk_state, | |
517 | NULL); | |
967440e3 BM |
518 | if (ACPI_FAILURE(status)) { |
519 | status = | |
520 | acpi_ds_method_error(status, walk_state); | |
521 | } | |
1da177e4 LT |
522 | |
523 | /* | |
524 | * If the transfer to the new method method call worked, a new walk | |
525 | * state was created -- get it | |
526 | */ | |
4be44fcd | 527 | walk_state = acpi_ds_get_current_walk_state(thread); |
1da177e4 | 528 | continue; |
4be44fcd | 529 | } else if (status == AE_CTRL_TERMINATE) { |
1da177e4 | 530 | status = AE_OK; |
4be44fcd | 531 | } else if ((status != AE_OK) && (walk_state->method_desc)) { |
52fc0b02 | 532 | |
c51a4de8 | 533 | /* Either the method parse or actual execution failed */ |
1da177e4 | 534 | |
b8e4d893 BM |
535 | ACPI_ERROR_METHOD("Method parse/execution failed", |
536 | walk_state->method_node, NULL, | |
537 | status); | |
aff8c277 | 538 | |
1da177e4 LT |
539 | /* Check for possible multi-thread reentrancy problem */ |
540 | ||
541 | if ((status == AE_ALREADY_EXISTS) && | |
967440e3 | 542 | (!walk_state->method_desc->method.mutex)) { |
1da177e4 | 543 | /* |
c51a4de8 BM |
544 | * Method tried to create an object twice. The probable cause is |
545 | * that the method cannot handle reentrancy. | |
546 | * | |
547 | * The method is marked not_serialized, but it tried to create | |
44f6c012 | 548 | * a named object, causing the second thread entrance to fail. |
c51a4de8 | 549 | * Workaround this problem by marking the method permanently |
44f6c012 | 550 | * as Serialized. |
1da177e4 | 551 | */ |
4be44fcd LB |
552 | walk_state->method_desc->method.method_flags |= |
553 | AML_METHOD_SERIALIZED; | |
967440e3 | 554 | walk_state->method_desc->method.sync_level = 0; |
1da177e4 LT |
555 | } |
556 | } | |
557 | ||
1da177e4 LT |
558 | /* We are done with this walk, move on to the parent if any */ |
559 | ||
4be44fcd | 560 | walk_state = acpi_ds_pop_walk_state(thread); |
1da177e4 LT |
561 | |
562 | /* Reset the current scope to the beginning of scope stack */ | |
563 | ||
4be44fcd | 564 | acpi_ds_scope_stack_clear(walk_state); |
1da177e4 LT |
565 | |
566 | /* | |
c51a4de8 BM |
567 | * If we just returned from the execution of a control method or if we |
568 | * encountered an error during the method parse phase, there's lots of | |
569 | * cleanup to do | |
1da177e4 | 570 | */ |
c51a4de8 BM |
571 | if (((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) == |
572 | ACPI_PARSE_EXECUTE) || (ACPI_FAILURE(status))) { | |
b229cf92 BM |
573 | acpi_ds_terminate_control_method(walk_state-> |
574 | method_desc, | |
575 | walk_state); | |
1da177e4 LT |
576 | } |
577 | ||
578 | /* Delete this walk state and all linked control states */ | |
579 | ||
4be44fcd | 580 | acpi_ps_cleanup_scope(&walk_state->parser_state); |
1da177e4 LT |
581 | previous_walk_state = walk_state; |
582 | ||
4be44fcd | 583 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
b229cf92 | 584 | "ReturnValue=%p, ImplicitValue=%p State=%p\n", |
4be44fcd LB |
585 | walk_state->return_desc, |
586 | walk_state->implicit_return_obj, walk_state)); | |
1da177e4 LT |
587 | |
588 | /* Check if we have restarted a preempted walk */ | |
589 | ||
4be44fcd | 590 | walk_state = acpi_ds_get_current_walk_state(thread); |
1da177e4 | 591 | if (walk_state) { |
4be44fcd | 592 | if (ACPI_SUCCESS(status)) { |
1da177e4 LT |
593 | /* |
594 | * There is another walk state, restart it. | |
595 | * If the method return value is not used by the parent, | |
596 | * The object is deleted | |
597 | */ | |
598 | if (!previous_walk_state->return_desc) { | |
4be44fcd LB |
599 | status = |
600 | acpi_ds_restart_control_method | |
601 | (walk_state, | |
602 | previous_walk_state-> | |
603 | implicit_return_obj); | |
604 | } else { | |
1da177e4 LT |
605 | /* |
606 | * We have a valid return value, delete any implicit | |
607 | * return value. | |
608 | */ | |
4be44fcd LB |
609 | acpi_ds_clear_implicit_return |
610 | (previous_walk_state); | |
1da177e4 | 611 | |
4be44fcd LB |
612 | status = |
613 | acpi_ds_restart_control_method | |
614 | (walk_state, | |
615 | previous_walk_state->return_desc); | |
1da177e4 | 616 | } |
4be44fcd LB |
617 | if (ACPI_SUCCESS(status)) { |
618 | walk_state->walk_type |= | |
619 | ACPI_WALK_METHOD_RESTART; | |
1da177e4 | 620 | } |
4be44fcd | 621 | } else { |
1da177e4 LT |
622 | /* On error, delete any return object */ |
623 | ||
4be44fcd LB |
624 | acpi_ut_remove_reference(previous_walk_state-> |
625 | return_desc); | |
1da177e4 LT |
626 | } |
627 | } | |
628 | ||
629 | /* | |
630 | * Just completed a 1st-level method, save the final internal return | |
631 | * value (if any) | |
632 | */ | |
633 | else if (previous_walk_state->caller_return_desc) { | |
634 | if (previous_walk_state->implicit_return_obj) { | |
44f6c012 | 635 | *(previous_walk_state->caller_return_desc) = |
4be44fcd LB |
636 | previous_walk_state->implicit_return_obj; |
637 | } else { | |
638 | /* NULL if no return value */ | |
1da177e4 | 639 | |
44f6c012 | 640 | *(previous_walk_state->caller_return_desc) = |
4be44fcd | 641 | previous_walk_state->return_desc; |
1da177e4 | 642 | } |
4be44fcd | 643 | } else { |
1da177e4 | 644 | if (previous_walk_state->return_desc) { |
52fc0b02 | 645 | |
1da177e4 LT |
646 | /* Caller doesn't want it, must delete it */ |
647 | ||
4be44fcd LB |
648 | acpi_ut_remove_reference(previous_walk_state-> |
649 | return_desc); | |
1da177e4 LT |
650 | } |
651 | if (previous_walk_state->implicit_return_obj) { | |
52fc0b02 | 652 | |
1da177e4 LT |
653 | /* Caller doesn't want it, must delete it */ |
654 | ||
4be44fcd LB |
655 | acpi_ut_remove_reference(previous_walk_state-> |
656 | implicit_return_obj); | |
1da177e4 LT |
657 | } |
658 | } | |
659 | ||
4be44fcd | 660 | acpi_ds_delete_walk_state(previous_walk_state); |
1da177e4 LT |
661 | } |
662 | ||
663 | /* Normal exit */ | |
664 | ||
4be44fcd LB |
665 | acpi_ex_release_all_mutexes(thread); |
666 | acpi_ut_delete_generic_state(ACPI_CAST_PTR | |
667 | (union acpi_generic_state, thread)); | |
1da177e4 | 668 | acpi_gbl_current_walk_list = prev_walk_list; |
4be44fcd | 669 | return_ACPI_STATUS(status); |
1da177e4 | 670 | } |