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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: dsmethod - Parser/Interpreter interface - control method parsing | |
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 | ||
1da177e4 LT |
44 | #include <acpi/acpi.h> |
45 | #include <acpi/acparser.h> | |
46 | #include <acpi/amlcode.h> | |
47 | #include <acpi/acdispat.h> | |
48 | #include <acpi/acinterp.h> | |
49 | #include <acpi/acnamesp.h> | |
50 | ||
1da177e4 | 51 | #define _COMPONENT ACPI_DISPATCHER |
4be44fcd | 52 | ACPI_MODULE_NAME("dsmethod") |
1da177e4 | 53 | |
1da177e4 LT |
54 | /******************************************************************************* |
55 | * | |
56 | * FUNCTION: acpi_ds_begin_method_execution | |
57 | * | |
58 | * PARAMETERS: method_node - Node of the method | |
59 | * obj_desc - The method object | |
60 | * calling_method_node - Caller of this method (if non-null) | |
61 | * | |
62 | * RETURN: Status | |
63 | * | |
64 | * DESCRIPTION: Prepare a method for execution. Parses the method if necessary, | |
65 | * increments the thread count, and waits at the method semaphore | |
66 | * for clearance to execute. | |
67 | * | |
68 | ******************************************************************************/ | |
1da177e4 | 69 | acpi_status |
4be44fcd LB |
70 | acpi_ds_begin_method_execution(struct acpi_namespace_node *method_node, |
71 | union acpi_operand_object *obj_desc, | |
72 | struct acpi_namespace_node *calling_method_node) | |
1da177e4 | 73 | { |
4be44fcd | 74 | acpi_status status = AE_OK; |
1da177e4 | 75 | |
4be44fcd | 76 | ACPI_FUNCTION_TRACE_PTR("ds_begin_method_execution", method_node); |
1da177e4 LT |
77 | |
78 | if (!method_node) { | |
4be44fcd | 79 | return_ACPI_STATUS(AE_NULL_ENTRY); |
1da177e4 LT |
80 | } |
81 | ||
aff8c277 RM |
82 | /* Prevent wraparound of thread count */ |
83 | ||
84 | if (obj_desc->method.thread_count == ACPI_UINT8_MAX) { | |
85 | ACPI_REPORT_ERROR(("Method reached maximum reentrancy limit (255)\n")); | |
86 | return_ACPI_STATUS(AE_AML_METHOD_LIMIT); | |
87 | } | |
88 | ||
1da177e4 LT |
89 | /* |
90 | * If there is a concurrency limit on this method, we need to | |
91 | * obtain a unit from the method semaphore. | |
92 | */ | |
93 | if (obj_desc->method.semaphore) { | |
94 | /* | |
95 | * Allow recursive method calls, up to the reentrancy/concurrency | |
96 | * limit imposed by the SERIALIZED rule and the sync_level method | |
97 | * parameter. | |
98 | * | |
99 | * The point of this code is to avoid permanently blocking a | |
100 | * thread that is making recursive method calls. | |
101 | */ | |
102 | if (method_node == calling_method_node) { | |
4be44fcd LB |
103 | if (obj_desc->method.thread_count >= |
104 | obj_desc->method.concurrency) { | |
105 | return_ACPI_STATUS(AE_AML_METHOD_LIMIT); | |
1da177e4 LT |
106 | } |
107 | } | |
108 | ||
109 | /* | |
110 | * Get a unit from the method semaphore. This releases the | |
111 | * interpreter if we block | |
112 | */ | |
4be44fcd LB |
113 | status = |
114 | acpi_ex_system_wait_semaphore(obj_desc->method.semaphore, | |
115 | ACPI_WAIT_FOREVER); | |
1da177e4 LT |
116 | } |
117 | ||
aff8c277 RM |
118 | /* |
119 | * Allocate an Owner ID for this method, only if this is the first thread | |
120 | * to begin concurrent execution. We only need one owner_id, even if the | |
121 | * method is invoked recursively. | |
122 | */ | |
123 | if (!obj_desc->method.owner_id) { | |
124 | status = acpi_ut_allocate_owner_id(&obj_desc->method.owner_id); | |
125 | if (ACPI_FAILURE(status)) { | |
126 | return_ACPI_STATUS(status); | |
127 | } | |
128 | } | |
129 | ||
1da177e4 LT |
130 | /* |
131 | * Increment the method parse tree thread count since it has been | |
132 | * reentered one more time (even if it is the same thread) | |
133 | */ | |
134 | obj_desc->method.thread_count++; | |
4be44fcd | 135 | return_ACPI_STATUS(status); |
1da177e4 LT |
136 | } |
137 | ||
1da177e4 LT |
138 | /******************************************************************************* |
139 | * | |
140 | * FUNCTION: acpi_ds_call_control_method | |
141 | * | |
142 | * PARAMETERS: Thread - Info for this thread | |
143 | * this_walk_state - Current walk state | |
144 | * Op - Current Op to be walked | |
145 | * | |
146 | * RETURN: Status | |
147 | * | |
148 | * DESCRIPTION: Transfer execution to a called control method | |
149 | * | |
150 | ******************************************************************************/ | |
151 | ||
152 | acpi_status | |
4be44fcd LB |
153 | acpi_ds_call_control_method(struct acpi_thread_state *thread, |
154 | struct acpi_walk_state *this_walk_state, | |
155 | union acpi_parse_object *op) | |
1da177e4 | 156 | { |
4be44fcd LB |
157 | acpi_status status; |
158 | struct acpi_namespace_node *method_node; | |
159 | struct acpi_walk_state *next_walk_state = NULL; | |
160 | union acpi_operand_object *obj_desc; | |
161 | struct acpi_parameter_info info; | |
162 | u32 i; | |
1da177e4 | 163 | |
4be44fcd | 164 | ACPI_FUNCTION_TRACE_PTR("ds_call_control_method", this_walk_state); |
1da177e4 | 165 | |
4be44fcd LB |
166 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
167 | "Execute method %p, currentstate=%p\n", | |
168 | this_walk_state->prev_op, this_walk_state)); | |
1da177e4 LT |
169 | |
170 | /* | |
171 | * Get the namespace entry for the control method we are about to call | |
172 | */ | |
173 | method_node = this_walk_state->method_call_node; | |
174 | if (!method_node) { | |
4be44fcd | 175 | return_ACPI_STATUS(AE_NULL_ENTRY); |
1da177e4 LT |
176 | } |
177 | ||
4be44fcd | 178 | obj_desc = acpi_ns_get_attached_object(method_node); |
1da177e4 | 179 | if (!obj_desc) { |
4be44fcd | 180 | return_ACPI_STATUS(AE_NULL_OBJECT); |
1da177e4 LT |
181 | } |
182 | ||
1da177e4 LT |
183 | /* Init for new method, wait on concurrency semaphore */ |
184 | ||
4be44fcd LB |
185 | status = acpi_ds_begin_method_execution(method_node, obj_desc, |
186 | this_walk_state->method_node); | |
187 | if (ACPI_FAILURE(status)) { | |
f9f4601f | 188 | goto cleanup; |
1da177e4 LT |
189 | } |
190 | ||
191 | if (!(obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY)) { | |
192 | /* 1) Parse: Create a new walk state for the preempting walk */ | |
193 | ||
4be44fcd LB |
194 | next_walk_state = |
195 | acpi_ds_create_walk_state(obj_desc->method.owner_id, op, | |
196 | obj_desc, NULL); | |
1da177e4 | 197 | if (!next_walk_state) { |
4be44fcd | 198 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
199 | } |
200 | ||
201 | /* Create and init a Root Node */ | |
202 | ||
4be44fcd | 203 | op = acpi_ps_create_scope_op(); |
1da177e4 LT |
204 | if (!op) { |
205 | status = AE_NO_MEMORY; | |
206 | goto cleanup; | |
207 | } | |
208 | ||
4be44fcd LB |
209 | status = acpi_ds_init_aml_walk(next_walk_state, op, method_node, |
210 | obj_desc->method.aml_start, | |
211 | obj_desc->method.aml_length, | |
212 | NULL, 1); | |
213 | if (ACPI_FAILURE(status)) { | |
214 | acpi_ds_delete_walk_state(next_walk_state); | |
1da177e4 LT |
215 | goto cleanup; |
216 | } | |
217 | ||
218 | /* Begin AML parse */ | |
219 | ||
4be44fcd LB |
220 | status = acpi_ps_parse_aml(next_walk_state); |
221 | acpi_ps_delete_parse_tree(op); | |
1da177e4 LT |
222 | } |
223 | ||
224 | /* 2) Execute: Create a new state for the preempting walk */ | |
225 | ||
4be44fcd LB |
226 | next_walk_state = acpi_ds_create_walk_state(obj_desc->method.owner_id, |
227 | NULL, obj_desc, thread); | |
1da177e4 LT |
228 | if (!next_walk_state) { |
229 | status = AE_NO_MEMORY; | |
230 | goto cleanup; | |
231 | } | |
232 | /* | |
233 | * The resolved arguments were put on the previous walk state's operand | |
aff8c277 RM |
234 | * stack. Operands on the previous walk state stack always |
235 | * start at index 0. Also, null terminate the list of arguments | |
1da177e4 | 236 | */ |
4be44fcd | 237 | this_walk_state->operands[this_walk_state->num_operands] = NULL; |
1da177e4 LT |
238 | |
239 | info.parameters = &this_walk_state->operands[0]; | |
240 | info.parameter_type = ACPI_PARAM_ARGS; | |
241 | ||
4be44fcd LB |
242 | status = acpi_ds_init_aml_walk(next_walk_state, NULL, method_node, |
243 | obj_desc->method.aml_start, | |
244 | obj_desc->method.aml_length, &info, 3); | |
245 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
246 | goto cleanup; |
247 | } | |
248 | ||
249 | /* | |
250 | * Delete the operands on the previous walkstate operand stack | |
251 | * (they were copied to new objects) | |
252 | */ | |
253 | for (i = 0; i < obj_desc->method.param_count; i++) { | |
4be44fcd LB |
254 | acpi_ut_remove_reference(this_walk_state->operands[i]); |
255 | this_walk_state->operands[i] = NULL; | |
1da177e4 LT |
256 | } |
257 | ||
258 | /* Clear the operand stack */ | |
259 | ||
260 | this_walk_state->num_operands = 0; | |
261 | ||
4be44fcd LB |
262 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
263 | "Starting nested execution, newstate=%p\n", | |
264 | next_walk_state)); | |
1da177e4 LT |
265 | |
266 | if (obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY) { | |
4be44fcd | 267 | status = obj_desc->method.implementation(next_walk_state); |
1da177e4 LT |
268 | } |
269 | ||
aff8c277 | 270 | return_ACPI_STATUS(status); |
a94f1881 LB |
271 | |
272 | cleanup: | |
aff8c277 | 273 | /* Decrement the thread count on the method parse tree */ |
a94f1881 | 274 | |
aff8c277 | 275 | if (next_walk_state && (next_walk_state->method_desc)) { |
4be44fcd | 276 | next_walk_state->method_desc->method.thread_count--; |
1da177e4 | 277 | } |
aff8c277 RM |
278 | |
279 | /* On error, we must delete the new walk state */ | |
280 | ||
281 | acpi_ds_terminate_control_method(next_walk_state); | |
a94f1881 | 282 | acpi_ds_delete_walk_state(next_walk_state); |
4be44fcd | 283 | return_ACPI_STATUS(status); |
1da177e4 LT |
284 | } |
285 | ||
1da177e4 LT |
286 | /******************************************************************************* |
287 | * | |
288 | * FUNCTION: acpi_ds_restart_control_method | |
289 | * | |
290 | * PARAMETERS: walk_state - State for preempted method (caller) | |
291 | * return_desc - Return value from the called method | |
292 | * | |
293 | * RETURN: Status | |
294 | * | |
295 | * DESCRIPTION: Restart a method that was preempted by another (nested) method | |
296 | * invocation. Handle the return value (if any) from the callee. | |
297 | * | |
298 | ******************************************************************************/ | |
299 | ||
300 | acpi_status | |
4be44fcd LB |
301 | acpi_ds_restart_control_method(struct acpi_walk_state *walk_state, |
302 | union acpi_operand_object *return_desc) | |
1da177e4 | 303 | { |
4be44fcd | 304 | acpi_status status; |
1da177e4 | 305 | |
4be44fcd | 306 | ACPI_FUNCTION_TRACE_PTR("ds_restart_control_method", walk_state); |
1da177e4 | 307 | |
4be44fcd LB |
308 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
309 | "****Restart [%4.4s] Op %p return_value_from_callee %p\n", | |
310 | (char *)&walk_state->method_node->name, | |
311 | walk_state->method_call_op, return_desc)); | |
1da177e4 | 312 | |
4be44fcd LB |
313 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
314 | " return_from_this_method_used?=%X res_stack %p Walk %p\n", | |
315 | walk_state->return_used, | |
316 | walk_state->results, walk_state)); | |
1da177e4 LT |
317 | |
318 | /* Did the called method return a value? */ | |
319 | ||
320 | if (return_desc) { | |
321 | /* Are we actually going to use the return value? */ | |
322 | ||
323 | if (walk_state->return_used) { | |
324 | /* Save the return value from the previous method */ | |
325 | ||
4be44fcd LB |
326 | status = acpi_ds_result_push(return_desc, walk_state); |
327 | if (ACPI_FAILURE(status)) { | |
328 | acpi_ut_remove_reference(return_desc); | |
329 | return_ACPI_STATUS(status); | |
1da177e4 LT |
330 | } |
331 | ||
332 | /* | |
333 | * Save as THIS method's return value in case it is returned | |
334 | * immediately to yet another method | |
335 | */ | |
336 | walk_state->return_desc = return_desc; | |
337 | } | |
338 | ||
339 | /* | |
340 | * The following code is the | |
341 | * optional support for a so-called "implicit return". Some AML code | |
342 | * assumes that the last value of the method is "implicitly" returned | |
343 | * to the caller. Just save the last result as the return value. | |
344 | * NOTE: this is optional because the ASL language does not actually | |
345 | * support this behavior. | |
346 | */ | |
4be44fcd LB |
347 | else if (!acpi_ds_do_implicit_return |
348 | (return_desc, walk_state, FALSE)) { | |
1da177e4 LT |
349 | /* |
350 | * Delete the return value if it will not be used by the | |
351 | * calling method | |
352 | */ | |
4be44fcd | 353 | acpi_ut_remove_reference(return_desc); |
1da177e4 LT |
354 | } |
355 | } | |
356 | ||
4be44fcd | 357 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
358 | } |
359 | ||
1da177e4 LT |
360 | /******************************************************************************* |
361 | * | |
362 | * FUNCTION: acpi_ds_terminate_control_method | |
363 | * | |
364 | * PARAMETERS: walk_state - State of the method | |
365 | * | |
aff8c277 | 366 | * RETURN: None |
1da177e4 LT |
367 | * |
368 | * DESCRIPTION: Terminate a control method. Delete everything that the method | |
369 | * created, delete all locals and arguments, and delete the parse | |
370 | * tree if requested. | |
371 | * | |
372 | ******************************************************************************/ | |
373 | ||
aff8c277 | 374 | void acpi_ds_terminate_control_method(struct acpi_walk_state *walk_state) |
1da177e4 | 375 | { |
4be44fcd LB |
376 | union acpi_operand_object *obj_desc; |
377 | struct acpi_namespace_node *method_node; | |
378 | acpi_status status; | |
1da177e4 | 379 | |
4be44fcd | 380 | ACPI_FUNCTION_TRACE_PTR("ds_terminate_control_method", walk_state); |
1da177e4 LT |
381 | |
382 | if (!walk_state) { | |
aff8c277 | 383 | return_VOID; |
1da177e4 LT |
384 | } |
385 | ||
386 | /* The current method object was saved in the walk state */ | |
387 | ||
388 | obj_desc = walk_state->method_desc; | |
389 | if (!obj_desc) { | |
aff8c277 | 390 | return_VOID; |
1da177e4 LT |
391 | } |
392 | ||
393 | /* Delete all arguments and locals */ | |
394 | ||
4be44fcd | 395 | acpi_ds_method_data_delete_all(walk_state); |
1da177e4 LT |
396 | |
397 | /* | |
398 | * Lock the parser while we terminate this method. | |
399 | * If this is the last thread executing the method, | |
400 | * we have additional cleanup to perform | |
401 | */ | |
4be44fcd LB |
402 | status = acpi_ut_acquire_mutex(ACPI_MTX_PARSER); |
403 | if (ACPI_FAILURE(status)) { | |
aff8c277 | 404 | return_VOID; |
1da177e4 LT |
405 | } |
406 | ||
407 | /* Signal completion of the execution of this method if necessary */ | |
408 | ||
409 | if (walk_state->method_desc->method.semaphore) { | |
4be44fcd LB |
410 | status = |
411 | acpi_os_signal_semaphore(walk_state->method_desc->method. | |
412 | semaphore, 1); | |
413 | if (ACPI_FAILURE(status)) { | |
414 | ACPI_REPORT_ERROR(("Could not signal method semaphore\n")); | |
1da177e4 LT |
415 | |
416 | /* Ignore error and continue cleanup */ | |
417 | } | |
418 | } | |
419 | ||
28f55ebc BM |
420 | /* |
421 | * There are no more threads executing this method. Perform | |
422 | * additional cleanup. | |
423 | * | |
424 | * The method Node is stored in the walk state | |
425 | */ | |
426 | method_node = walk_state->method_node; | |
427 | ||
428 | /* Lock namespace for possible update */ | |
429 | ||
430 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); | |
431 | if (ACPI_FAILURE(status)) { | |
432 | goto exit; | |
433 | } | |
434 | ||
435 | /* | |
436 | * Delete any namespace entries created immediately underneath | |
437 | * the method | |
438 | */ | |
439 | if (method_node->child) { | |
440 | acpi_ns_delete_namespace_subtree(method_node); | |
441 | } | |
442 | ||
443 | /* | |
444 | * Delete any namespace entries created anywhere else within | |
445 | * the namespace by the execution of this method | |
446 | */ | |
447 | acpi_ns_delete_namespace_by_owner(walk_state->method_desc->method. | |
448 | owner_id); | |
449 | status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); | |
450 | ||
451 | /* Are there any other threads currently executing this method? */ | |
452 | ||
1da177e4 | 453 | if (walk_state->method_desc->method.thread_count) { |
28f55ebc BM |
454 | /* |
455 | * Additional threads. Do not release the owner_id in this case, | |
456 | * we immediately reuse it for the next thread executing this method | |
457 | */ | |
4be44fcd | 458 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
28f55ebc | 459 | "*** Completed execution of one thread, %d threads remaining\n", |
4be44fcd LB |
460 | walk_state->method_desc->method. |
461 | thread_count)); | |
28f55ebc BM |
462 | } else { |
463 | /* This is the only executing thread for this method */ | |
1da177e4 | 464 | |
1da177e4 LT |
465 | /* |
466 | * Support to dynamically change a method from not_serialized to | |
28f55ebc | 467 | * Serialized if it appears that the method is incorrectly written and |
1da177e4 LT |
468 | * does not support multiple thread execution. The best example of this |
469 | * is if such a method creates namespace objects and blocks. A second | |
470 | * thread will fail with an AE_ALREADY_EXISTS exception | |
471 | * | |
472 | * This code is here because we must wait until the last thread exits | |
473 | * before creating the synchronization semaphore. | |
474 | */ | |
475 | if ((walk_state->method_desc->method.concurrency == 1) && | |
4be44fcd LB |
476 | (!walk_state->method_desc->method.semaphore)) { |
477 | status = acpi_os_create_semaphore(1, 1, | |
478 | &walk_state-> | |
479 | method_desc->method. | |
480 | semaphore); | |
1da177e4 LT |
481 | } |
482 | ||
28f55ebc | 483 | /* No more threads, we can free the owner_id */ |
1da177e4 | 484 | |
4be44fcd LB |
485 | acpi_ut_release_owner_id(&walk_state->method_desc->method. |
486 | owner_id); | |
1da177e4 | 487 | } |
a94f1881 | 488 | |
aff8c277 RM |
489 | exit: |
490 | (void)acpi_ut_release_mutex(ACPI_MTX_PARSER); | |
491 | return_VOID; | |
1da177e4 | 492 | } |
28f55ebc BM |
493 | |
494 | #ifdef ACPI_INIT_PARSE_METHODS | |
495 | /* | |
496 | * Note 11/2005: Removed this code to parse all methods during table | |
497 | * load because it causes problems if there are any errors during the | |
498 | * parse. Also, it seems like overkill and we probably don't want to | |
499 | * abort a table load because of an issue with a single method. | |
500 | */ | |
501 | ||
502 | /******************************************************************************* | |
503 | * | |
504 | * FUNCTION: acpi_ds_parse_method | |
505 | * | |
506 | * PARAMETERS: Node - Method node | |
507 | * | |
508 | * RETURN: Status | |
509 | * | |
510 | * DESCRIPTION: Parse the AML that is associated with the method. | |
511 | * | |
512 | * MUTEX: Assumes parser is locked | |
513 | * | |
514 | ******************************************************************************/ | |
515 | ||
516 | acpi_status acpi_ds_parse_method(struct acpi_namespace_node *node) | |
517 | { | |
518 | acpi_status status; | |
519 | union acpi_operand_object *obj_desc; | |
520 | union acpi_parse_object *op; | |
521 | struct acpi_walk_state *walk_state; | |
522 | ||
523 | ACPI_FUNCTION_TRACE_PTR("ds_parse_method", node); | |
524 | ||
525 | /* Parameter Validation */ | |
526 | ||
527 | if (!node) { | |
528 | return_ACPI_STATUS(AE_NULL_ENTRY); | |
529 | } | |
530 | ||
531 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, | |
532 | "**** Parsing [%4.4s] **** named_obj=%p\n", | |
533 | acpi_ut_get_node_name(node), node)); | |
534 | ||
535 | /* Extract the method object from the method Node */ | |
536 | ||
537 | obj_desc = acpi_ns_get_attached_object(node); | |
538 | if (!obj_desc) { | |
539 | return_ACPI_STATUS(AE_NULL_OBJECT); | |
540 | } | |
541 | ||
542 | /* Create a mutex for the method if there is a concurrency limit */ | |
543 | ||
544 | if ((obj_desc->method.concurrency != ACPI_INFINITE_CONCURRENCY) && | |
545 | (!obj_desc->method.semaphore)) { | |
546 | status = acpi_os_create_semaphore(obj_desc->method.concurrency, | |
547 | obj_desc->method.concurrency, | |
548 | &obj_desc->method.semaphore); | |
549 | if (ACPI_FAILURE(status)) { | |
550 | return_ACPI_STATUS(status); | |
551 | } | |
552 | } | |
553 | ||
554 | /* | |
555 | * Allocate a new parser op to be the root of the parsed | |
556 | * method tree | |
557 | */ | |
558 | op = acpi_ps_alloc_op(AML_METHOD_OP); | |
559 | if (!op) { | |
560 | return_ACPI_STATUS(AE_NO_MEMORY); | |
561 | } | |
562 | ||
563 | /* Init new op with the method name and pointer back to the Node */ | |
564 | ||
565 | acpi_ps_set_name(op, node->name.integer); | |
566 | op->common.node = node; | |
567 | ||
568 | /* | |
569 | * Get a new owner_id for objects created by this method. Namespace | |
570 | * objects (such as Operation Regions) can be created during the | |
571 | * first pass parse. | |
572 | */ | |
573 | status = acpi_ut_allocate_owner_id(&obj_desc->method.owner_id); | |
574 | if (ACPI_FAILURE(status)) { | |
575 | goto cleanup; | |
576 | } | |
577 | ||
578 | /* Create and initialize a new walk state */ | |
579 | ||
580 | walk_state = | |
581 | acpi_ds_create_walk_state(obj_desc->method.owner_id, NULL, NULL, | |
582 | NULL); | |
583 | if (!walk_state) { | |
584 | status = AE_NO_MEMORY; | |
585 | goto cleanup2; | |
586 | } | |
587 | ||
588 | status = acpi_ds_init_aml_walk(walk_state, op, node, | |
589 | obj_desc->method.aml_start, | |
590 | obj_desc->method.aml_length, NULL, 1); | |
591 | if (ACPI_FAILURE(status)) { | |
592 | acpi_ds_delete_walk_state(walk_state); | |
593 | goto cleanup2; | |
594 | } | |
595 | ||
596 | /* | |
597 | * Parse the method, first pass | |
598 | * | |
599 | * The first pass load is where newly declared named objects are added into | |
600 | * the namespace. Actual evaluation of the named objects (what would be | |
601 | * called a "second pass") happens during the actual execution of the | |
602 | * method so that operands to the named objects can take on dynamic | |
603 | * run-time values. | |
604 | */ | |
605 | status = acpi_ps_parse_aml(walk_state); | |
606 | if (ACPI_FAILURE(status)) { | |
607 | goto cleanup2; | |
608 | } | |
609 | ||
610 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, | |
611 | "**** [%4.4s] Parsed **** named_obj=%p Op=%p\n", | |
612 | acpi_ut_get_node_name(node), node, op)); | |
613 | ||
614 | /* | |
615 | * Delete the parse tree. We simply re-parse the method for every | |
616 | * execution since there isn't much overhead (compared to keeping lots | |
617 | * of parse trees around) | |
618 | */ | |
619 | acpi_ns_delete_namespace_subtree(node); | |
620 | acpi_ns_delete_namespace_by_owner(obj_desc->method.owner_id); | |
621 | ||
622 | cleanup2: | |
623 | acpi_ut_release_owner_id(&obj_desc->method.owner_id); | |
624 | ||
625 | cleanup: | |
626 | acpi_ps_delete_parse_tree(op); | |
627 | return_ACPI_STATUS(status); | |
628 | } | |
629 | #endif |