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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: psparse - Parser top level AML parse routines | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
75a44ce0 | 8 | * Copyright (C) 2000 - 2008, Intel Corp. |
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> | |
e2f7a777 LB |
54 | #include "accommon.h" |
55 | #include "acparser.h" | |
56 | #include "acdispat.h" | |
57 | #include "amlcode.h" | |
58 | #include "acnamesp.h" | |
59 | #include "acinterp.h" | |
1da177e4 LT |
60 | |
61 | #define _COMPONENT ACPI_PARSER | |
4be44fcd | 62 | ACPI_MODULE_NAME("psparse") |
1da177e4 | 63 | |
1da177e4 LT |
64 | /******************************************************************************* |
65 | * | |
66 | * FUNCTION: acpi_ps_get_opcode_size | |
67 | * | |
68 | * PARAMETERS: Opcode - An AML opcode | |
69 | * | |
70 | * RETURN: Size of the opcode, in bytes (1 or 2) | |
71 | * | |
72 | * DESCRIPTION: Get the size of the current opcode. | |
73 | * | |
74 | ******************************************************************************/ | |
4be44fcd | 75 | u32 acpi_ps_get_opcode_size(u32 opcode) |
1da177e4 LT |
76 | { |
77 | ||
78 | /* Extended (2-byte) opcode if > 255 */ | |
79 | ||
80 | if (opcode > 0x00FF) { | |
81 | return (2); | |
82 | } | |
83 | ||
84 | /* Otherwise, just a single byte opcode */ | |
85 | ||
86 | return (1); | |
87 | } | |
88 | ||
1da177e4 LT |
89 | /******************************************************************************* |
90 | * | |
91 | * FUNCTION: acpi_ps_peek_opcode | |
92 | * | |
93 | * PARAMETERS: parser_state - A parser state object | |
94 | * | |
44f6c012 | 95 | * RETURN: Next AML opcode |
1da177e4 LT |
96 | * |
97 | * DESCRIPTION: Get next AML opcode (without incrementing AML pointer) | |
98 | * | |
99 | ******************************************************************************/ | |
100 | ||
4be44fcd | 101 | u16 acpi_ps_peek_opcode(struct acpi_parse_state * parser_state) |
1da177e4 | 102 | { |
4be44fcd LB |
103 | u8 *aml; |
104 | u16 opcode; | |
1da177e4 LT |
105 | |
106 | aml = parser_state->aml; | |
4be44fcd | 107 | opcode = (u16) ACPI_GET8(aml); |
1da177e4 | 108 | |
73459f73 | 109 | if (opcode == AML_EXTENDED_OP_PREFIX) { |
52fc0b02 | 110 | |
73459f73 | 111 | /* Extended opcode, get the second opcode byte */ |
1da177e4 LT |
112 | |
113 | aml++; | |
4be44fcd | 114 | opcode = (u16) ((opcode << 8) | ACPI_GET8(aml)); |
1da177e4 LT |
115 | } |
116 | ||
117 | return (opcode); | |
118 | } | |
119 | ||
1da177e4 LT |
120 | /******************************************************************************* |
121 | * | |
122 | * FUNCTION: acpi_ps_complete_this_op | |
123 | * | |
124 | * PARAMETERS: walk_state - Current State | |
125 | * Op - Op to complete | |
126 | * | |
88ac00f5 | 127 | * RETURN: Status |
1da177e4 LT |
128 | * |
129 | * DESCRIPTION: Perform any cleanup at the completion of an Op. | |
130 | * | |
131 | ******************************************************************************/ | |
132 | ||
73459f73 | 133 | acpi_status |
4be44fcd LB |
134 | acpi_ps_complete_this_op(struct acpi_walk_state * walk_state, |
135 | union acpi_parse_object * op) | |
1da177e4 | 136 | { |
4be44fcd LB |
137 | union acpi_parse_object *prev; |
138 | union acpi_parse_object *next; | |
139 | const struct acpi_opcode_info *parent_info; | |
140 | union acpi_parse_object *replacement_op = NULL; | |
c35def21 | 141 | acpi_status status = AE_OK; |
1da177e4 | 142 | |
b229cf92 | 143 | ACPI_FUNCTION_TRACE_PTR(ps_complete_this_op, op); |
1da177e4 LT |
144 | |
145 | /* Check for null Op, can happen if AML code is corrupt */ | |
146 | ||
147 | if (!op) { | |
4be44fcd | 148 | return_ACPI_STATUS(AE_OK); /* OK for now */ |
1da177e4 LT |
149 | } |
150 | ||
151 | /* Delete this op and the subtree below it if asked to */ | |
152 | ||
4be44fcd LB |
153 | if (((walk_state->parse_flags & ACPI_PARSE_TREE_MASK) != |
154 | ACPI_PARSE_DELETE_TREE) | |
155 | || (walk_state->op_info->class == AML_CLASS_ARGUMENT)) { | |
156 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
157 | } |
158 | ||
159 | /* Make sure that we only delete this subtree */ | |
160 | ||
161 | if (op->common.parent) { | |
88ac00f5 RM |
162 | prev = op->common.parent->common.value.arg; |
163 | if (!prev) { | |
52fc0b02 | 164 | |
88ac00f5 RM |
165 | /* Nothing more to do */ |
166 | ||
167 | goto cleanup; | |
168 | } | |
169 | ||
1da177e4 LT |
170 | /* |
171 | * Check if we need to replace the operator and its subtree | |
172 | * with a return value op (placeholder op) | |
173 | */ | |
4be44fcd LB |
174 | parent_info = |
175 | acpi_ps_get_opcode_info(op->common.parent->common. | |
176 | aml_opcode); | |
1da177e4 LT |
177 | |
178 | switch (parent_info->class) { | |
179 | case AML_CLASS_CONTROL: | |
180 | break; | |
181 | ||
182 | case AML_CLASS_CREATE: | |
183 | ||
184 | /* | |
185 | * These opcodes contain term_arg operands. The current | |
186 | * op must be replaced by a placeholder return op | |
187 | */ | |
4be44fcd LB |
188 | replacement_op = |
189 | acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP); | |
1da177e4 | 190 | if (!replacement_op) { |
c35def21 | 191 | status = AE_NO_MEMORY; |
1da177e4 LT |
192 | } |
193 | break; | |
194 | ||
195 | case AML_CLASS_NAMED_OBJECT: | |
196 | ||
197 | /* | |
198 | * These opcodes contain term_arg operands. The current | |
199 | * op must be replaced by a placeholder return op | |
200 | */ | |
4be44fcd LB |
201 | if ((op->common.parent->common.aml_opcode == |
202 | AML_REGION_OP) | |
203 | || (op->common.parent->common.aml_opcode == | |
204 | AML_DATA_REGION_OP) | |
205 | || (op->common.parent->common.aml_opcode == | |
206 | AML_BUFFER_OP) | |
207 | || (op->common.parent->common.aml_opcode == | |
208 | AML_PACKAGE_OP) | |
ef805d95 LM |
209 | || (op->common.parent->common.aml_opcode == |
210 | AML_BANK_FIELD_OP) | |
4be44fcd LB |
211 | || (op->common.parent->common.aml_opcode == |
212 | AML_VAR_PACKAGE_OP)) { | |
213 | replacement_op = | |
214 | acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP); | |
1da177e4 | 215 | if (!replacement_op) { |
c35def21 | 216 | status = AE_NO_MEMORY; |
1da177e4 | 217 | } |
4be44fcd LB |
218 | } else |
219 | if ((op->common.parent->common.aml_opcode == | |
220 | AML_NAME_OP) | |
221 | && (walk_state->pass_number <= | |
222 | ACPI_IMODE_LOAD_PASS2)) { | |
223 | if ((op->common.aml_opcode == AML_BUFFER_OP) | |
224 | || (op->common.aml_opcode == AML_PACKAGE_OP) | |
225 | || (op->common.aml_opcode == | |
226 | AML_VAR_PACKAGE_OP)) { | |
227 | replacement_op = | |
228 | acpi_ps_alloc_op(op->common. | |
229 | aml_opcode); | |
1da177e4 | 230 | if (!replacement_op) { |
c35def21 LM |
231 | status = AE_NO_MEMORY; |
232 | } else { | |
233 | replacement_op->named.data = | |
234 | op->named.data; | |
235 | replacement_op->named.length = | |
236 | op->named.length; | |
1da177e4 | 237 | } |
1da177e4 LT |
238 | } |
239 | } | |
240 | break; | |
241 | ||
242 | default: | |
88ac00f5 | 243 | |
4be44fcd LB |
244 | replacement_op = |
245 | acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP); | |
1da177e4 | 246 | if (!replacement_op) { |
c35def21 | 247 | status = AE_NO_MEMORY; |
1da177e4 LT |
248 | } |
249 | } | |
250 | ||
251 | /* We must unlink this op from the parent tree */ | |
252 | ||
1da177e4 | 253 | if (prev == op) { |
52fc0b02 | 254 | |
1da177e4 LT |
255 | /* This op is the first in the list */ |
256 | ||
257 | if (replacement_op) { | |
4be44fcd LB |
258 | replacement_op->common.parent = |
259 | op->common.parent; | |
260 | replacement_op->common.value.arg = NULL; | |
261 | replacement_op->common.node = op->common.node; | |
262 | op->common.parent->common.value.arg = | |
263 | replacement_op; | |
264 | replacement_op->common.next = op->common.next; | |
265 | } else { | |
266 | op->common.parent->common.value.arg = | |
267 | op->common.next; | |
1da177e4 LT |
268 | } |
269 | } | |
270 | ||
271 | /* Search the parent list */ | |
272 | ||
4be44fcd LB |
273 | else |
274 | while (prev) { | |
52fc0b02 | 275 | |
4be44fcd LB |
276 | /* Traverse all siblings in the parent's argument list */ |
277 | ||
278 | next = prev->common.next; | |
279 | if (next == op) { | |
280 | if (replacement_op) { | |
281 | replacement_op->common.parent = | |
282 | op->common.parent; | |
283 | replacement_op->common.value. | |
284 | arg = NULL; | |
285 | replacement_op->common.node = | |
286 | op->common.node; | |
287 | prev->common.next = | |
288 | replacement_op; | |
289 | replacement_op->common.next = | |
290 | op->common.next; | |
291 | next = NULL; | |
292 | } else { | |
293 | prev->common.next = | |
294 | op->common.next; | |
295 | next = NULL; | |
296 | } | |
1da177e4 | 297 | } |
4be44fcd | 298 | prev = next; |
1da177e4 | 299 | } |
1da177e4 LT |
300 | } |
301 | ||
4be44fcd | 302 | cleanup: |
1da177e4 | 303 | |
44f6c012 | 304 | /* Now we can actually delete the subtree rooted at Op */ |
1da177e4 | 305 | |
4be44fcd | 306 | acpi_ps_delete_parse_tree(op); |
c35def21 | 307 | return_ACPI_STATUS(status); |
1da177e4 LT |
308 | } |
309 | ||
1da177e4 LT |
310 | /******************************************************************************* |
311 | * | |
312 | * FUNCTION: acpi_ps_next_parse_state | |
313 | * | |
44f6c012 RM |
314 | * PARAMETERS: walk_state - Current state |
315 | * Op - Current parse op | |
316 | * callback_status - Status from previous operation | |
1da177e4 LT |
317 | * |
318 | * RETURN: Status | |
319 | * | |
320 | * DESCRIPTION: Update the parser state based upon the return exception from | |
321 | * the parser callback. | |
322 | * | |
323 | ******************************************************************************/ | |
324 | ||
73459f73 | 325 | acpi_status |
4be44fcd LB |
326 | acpi_ps_next_parse_state(struct acpi_walk_state *walk_state, |
327 | union acpi_parse_object *op, | |
328 | acpi_status callback_status) | |
1da177e4 | 329 | { |
4be44fcd LB |
330 | struct acpi_parse_state *parser_state = &walk_state->parser_state; |
331 | acpi_status status = AE_CTRL_PENDING; | |
1da177e4 | 332 | |
b229cf92 | 333 | ACPI_FUNCTION_TRACE_PTR(ps_next_parse_state, op); |
1da177e4 LT |
334 | |
335 | switch (callback_status) { | |
336 | case AE_CTRL_TERMINATE: | |
1da177e4 LT |
337 | /* |
338 | * A control method was terminated via a RETURN statement. | |
339 | * The walk of this method is complete. | |
340 | */ | |
341 | parser_state->aml = parser_state->aml_end; | |
342 | status = AE_CTRL_TERMINATE; | |
343 | break; | |
344 | ||
1da177e4 LT |
345 | case AE_CTRL_BREAK: |
346 | ||
347 | parser_state->aml = walk_state->aml_last_while; | |
348 | walk_state->control_state->common.value = FALSE; | |
773069d4 | 349 | status = AE_CTRL_BREAK; |
1da177e4 LT |
350 | break; |
351 | ||
352 | case AE_CTRL_CONTINUE: | |
353 | ||
1da177e4 | 354 | parser_state->aml = walk_state->aml_last_while; |
773069d4 | 355 | status = AE_CTRL_CONTINUE; |
1da177e4 LT |
356 | break; |
357 | ||
358 | case AE_CTRL_PENDING: | |
359 | ||
360 | parser_state->aml = walk_state->aml_last_while; | |
361 | break; | |
362 | ||
363 | #if 0 | |
364 | case AE_CTRL_SKIP: | |
365 | ||
366 | parser_state->aml = parser_state->scope->parse_scope.pkg_end; | |
367 | status = AE_OK; | |
368 | break; | |
369 | #endif | |
370 | ||
371 | case AE_CTRL_TRUE: | |
1da177e4 LT |
372 | /* |
373 | * Predicate of an IF was true, and we are at the matching ELSE. | |
374 | * Just close out this package | |
375 | */ | |
4be44fcd | 376 | parser_state->aml = acpi_ps_get_next_package_end(parser_state); |
773069d4 | 377 | status = AE_CTRL_PENDING; |
1da177e4 LT |
378 | break; |
379 | ||
1da177e4 | 380 | case AE_CTRL_FALSE: |
1da177e4 LT |
381 | /* |
382 | * Either an IF/WHILE Predicate was false or we encountered a BREAK | |
383 | * opcode. In both cases, we do not execute the rest of the | |
384 | * package; We simply close out the parent (finishing the walk of | |
385 | * this branch of the tree) and continue execution at the parent | |
386 | * level. | |
387 | */ | |
388 | parser_state->aml = parser_state->scope->parse_scope.pkg_end; | |
389 | ||
390 | /* In the case of a BREAK, just force a predicate (if any) to FALSE */ | |
391 | ||
392 | walk_state->control_state->common.value = FALSE; | |
393 | status = AE_CTRL_END; | |
394 | break; | |
395 | ||
1da177e4 LT |
396 | case AE_CTRL_TRANSFER: |
397 | ||
44f6c012 RM |
398 | /* A method call (invocation) -- transfer control */ |
399 | ||
1da177e4 LT |
400 | status = AE_CTRL_TRANSFER; |
401 | walk_state->prev_op = op; | |
402 | walk_state->method_call_op = op; | |
4be44fcd LB |
403 | walk_state->method_call_node = |
404 | (op->common.value.arg)->common.node; | |
1da177e4 LT |
405 | |
406 | /* Will return value (if any) be used by the caller? */ | |
407 | ||
4be44fcd LB |
408 | walk_state->return_used = |
409 | acpi_ds_is_result_used(op, walk_state); | |
1da177e4 LT |
410 | break; |
411 | ||
1da177e4 | 412 | default: |
44f6c012 | 413 | |
1da177e4 LT |
414 | status = callback_status; |
415 | if ((callback_status & AE_CODE_MASK) == AE_CODE_CONTROL) { | |
416 | status = AE_OK; | |
417 | } | |
418 | break; | |
419 | } | |
420 | ||
4be44fcd | 421 | return_ACPI_STATUS(status); |
1da177e4 LT |
422 | } |
423 | ||
1da177e4 LT |
424 | /******************************************************************************* |
425 | * | |
426 | * FUNCTION: acpi_ps_parse_aml | |
427 | * | |
44f6c012 | 428 | * PARAMETERS: walk_state - Current state |
1da177e4 LT |
429 | * |
430 | * | |
431 | * RETURN: Status | |
432 | * | |
433 | * DESCRIPTION: Parse raw AML and return a tree of ops | |
434 | * | |
435 | ******************************************************************************/ | |
436 | ||
4be44fcd | 437 | acpi_status acpi_ps_parse_aml(struct acpi_walk_state *walk_state) |
1da177e4 | 438 | { |
4be44fcd | 439 | acpi_status status; |
4be44fcd LB |
440 | struct acpi_thread_state *thread; |
441 | struct acpi_thread_state *prev_walk_list = acpi_gbl_current_walk_list; | |
442 | struct acpi_walk_state *previous_walk_state; | |
1da177e4 | 443 | |
b229cf92 | 444 | ACPI_FUNCTION_TRACE(ps_parse_aml); |
1da177e4 | 445 | |
4be44fcd | 446 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
b229cf92 | 447 | "Entered with WalkState=%p Aml=%p size=%X\n", |
4be44fcd LB |
448 | walk_state, walk_state->parser_state.aml, |
449 | walk_state->parser_state.aml_size)); | |
1da177e4 | 450 | |
a8fadc92 BM |
451 | if (!walk_state->parser_state.aml) { |
452 | return_ACPI_STATUS(AE_NULL_OBJECT); | |
453 | } | |
454 | ||
1da177e4 LT |
455 | /* Create and initialize a new thread state */ |
456 | ||
4be44fcd | 457 | thread = acpi_ut_create_thread_state(); |
1da177e4 | 458 | if (!thread) { |
84d4db7c LM |
459 | if (walk_state->method_desc) { |
460 | ||
461 | /* Executing a control method - additional cleanup */ | |
462 | ||
463 | acpi_ds_terminate_control_method( | |
464 | walk_state->method_desc, walk_state); | |
465 | } | |
466 | ||
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)) { |
13b572a3 | 543 | ACPI_INFO((AE_INFO, |
6deb65dd | 544 | "Marking method %4.4s as Serialized because of AE_ALREADY_EXISTS error", |
13b572a3 BM |
545 | walk_state->method_node->name. |
546 | ascii)); | |
547 | ||
1da177e4 | 548 | /* |
c51a4de8 BM |
549 | * Method tried to create an object twice. The probable cause is |
550 | * that the method cannot handle reentrancy. | |
551 | * | |
552 | * The method is marked not_serialized, but it tried to create | |
44f6c012 | 553 | * a named object, causing the second thread entrance to fail. |
c51a4de8 | 554 | * Workaround this problem by marking the method permanently |
44f6c012 | 555 | * as Serialized. |
1da177e4 | 556 | */ |
4be44fcd LB |
557 | walk_state->method_desc->method.method_flags |= |
558 | AML_METHOD_SERIALIZED; | |
967440e3 | 559 | walk_state->method_desc->method.sync_level = 0; |
1da177e4 LT |
560 | } |
561 | } | |
562 | ||
1da177e4 LT |
563 | /* We are done with this walk, move on to the parent if any */ |
564 | ||
4be44fcd | 565 | walk_state = acpi_ds_pop_walk_state(thread); |
1da177e4 LT |
566 | |
567 | /* Reset the current scope to the beginning of scope stack */ | |
568 | ||
4be44fcd | 569 | acpi_ds_scope_stack_clear(walk_state); |
1da177e4 LT |
570 | |
571 | /* | |
c51a4de8 BM |
572 | * If we just returned from the execution of a control method or if we |
573 | * encountered an error during the method parse phase, there's lots of | |
574 | * cleanup to do | |
1da177e4 | 575 | */ |
c51a4de8 BM |
576 | if (((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) == |
577 | ACPI_PARSE_EXECUTE) || (ACPI_FAILURE(status))) { | |
b229cf92 BM |
578 | acpi_ds_terminate_control_method(walk_state-> |
579 | method_desc, | |
580 | walk_state); | |
1da177e4 LT |
581 | } |
582 | ||
583 | /* Delete this walk state and all linked control states */ | |
584 | ||
4be44fcd | 585 | acpi_ps_cleanup_scope(&walk_state->parser_state); |
1da177e4 LT |
586 | previous_walk_state = walk_state; |
587 | ||
4be44fcd | 588 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
b229cf92 | 589 | "ReturnValue=%p, ImplicitValue=%p State=%p\n", |
4be44fcd LB |
590 | walk_state->return_desc, |
591 | walk_state->implicit_return_obj, walk_state)); | |
1da177e4 LT |
592 | |
593 | /* Check if we have restarted a preempted walk */ | |
594 | ||
4be44fcd | 595 | walk_state = acpi_ds_get_current_walk_state(thread); |
1da177e4 | 596 | if (walk_state) { |
4be44fcd | 597 | if (ACPI_SUCCESS(status)) { |
1da177e4 LT |
598 | /* |
599 | * There is another walk state, restart it. | |
600 | * If the method return value is not used by the parent, | |
601 | * The object is deleted | |
602 | */ | |
603 | if (!previous_walk_state->return_desc) { | |
9accd464 LM |
604 | /* |
605 | * In slack mode execution, if there is no return value | |
606 | * we should implicitly return zero (0) as a default value. | |
607 | */ | |
608 | if (acpi_gbl_enable_interpreter_slack && | |
609 | !previous_walk_state-> | |
610 | implicit_return_obj) { | |
611 | previous_walk_state-> | |
612 | implicit_return_obj = | |
dc95a270 BM |
613 | acpi_ut_create_integer_object |
614 | ((u64) 0); | |
9accd464 LM |
615 | if (!previous_walk_state-> |
616 | implicit_return_obj) { | |
617 | return_ACPI_STATUS | |
618 | (AE_NO_MEMORY); | |
619 | } | |
9accd464 LM |
620 | } |
621 | ||
622 | /* Restart the calling control method */ | |
623 | ||
4be44fcd LB |
624 | status = |
625 | acpi_ds_restart_control_method | |
626 | (walk_state, | |
627 | previous_walk_state-> | |
628 | implicit_return_obj); | |
629 | } else { | |
1da177e4 LT |
630 | /* |
631 | * We have a valid return value, delete any implicit | |
632 | * return value. | |
633 | */ | |
4be44fcd LB |
634 | acpi_ds_clear_implicit_return |
635 | (previous_walk_state); | |
1da177e4 | 636 | |
4be44fcd LB |
637 | status = |
638 | acpi_ds_restart_control_method | |
639 | (walk_state, | |
640 | previous_walk_state->return_desc); | |
1da177e4 | 641 | } |
4be44fcd LB |
642 | if (ACPI_SUCCESS(status)) { |
643 | walk_state->walk_type |= | |
644 | ACPI_WALK_METHOD_RESTART; | |
1da177e4 | 645 | } |
4be44fcd | 646 | } else { |
d8a0ec91 | 647 | /* On error, delete any return object or implicit return */ |
1da177e4 | 648 | |
4be44fcd LB |
649 | acpi_ut_remove_reference(previous_walk_state-> |
650 | return_desc); | |
d8a0ec91 LM |
651 | acpi_ds_clear_implicit_return |
652 | (previous_walk_state); | |
1da177e4 LT |
653 | } |
654 | } | |
655 | ||
656 | /* | |
657 | * Just completed a 1st-level method, save the final internal return | |
658 | * value (if any) | |
659 | */ | |
660 | else if (previous_walk_state->caller_return_desc) { | |
661 | if (previous_walk_state->implicit_return_obj) { | |
44f6c012 | 662 | *(previous_walk_state->caller_return_desc) = |
4be44fcd LB |
663 | previous_walk_state->implicit_return_obj; |
664 | } else { | |
665 | /* NULL if no return value */ | |
1da177e4 | 666 | |
44f6c012 | 667 | *(previous_walk_state->caller_return_desc) = |
4be44fcd | 668 | previous_walk_state->return_desc; |
1da177e4 | 669 | } |
4be44fcd | 670 | } else { |
1da177e4 | 671 | if (previous_walk_state->return_desc) { |
52fc0b02 | 672 | |
1da177e4 LT |
673 | /* Caller doesn't want it, must delete it */ |
674 | ||
4be44fcd LB |
675 | acpi_ut_remove_reference(previous_walk_state-> |
676 | return_desc); | |
1da177e4 LT |
677 | } |
678 | if (previous_walk_state->implicit_return_obj) { | |
52fc0b02 | 679 | |
1da177e4 LT |
680 | /* Caller doesn't want it, must delete it */ |
681 | ||
4be44fcd LB |
682 | acpi_ut_remove_reference(previous_walk_state-> |
683 | implicit_return_obj); | |
1da177e4 LT |
684 | } |
685 | } | |
686 | ||
4be44fcd | 687 | acpi_ds_delete_walk_state(previous_walk_state); |
1da177e4 LT |
688 | } |
689 | ||
690 | /* Normal exit */ | |
691 | ||
4be44fcd LB |
692 | acpi_ex_release_all_mutexes(thread); |
693 | acpi_ut_delete_generic_state(ACPI_CAST_PTR | |
694 | (union acpi_generic_state, thread)); | |
1da177e4 | 695 | acpi_gbl_current_walk_list = prev_walk_list; |
4be44fcd | 696 | return_ACPI_STATUS(status); |
1da177e4 | 697 | } |