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1da177e4 LT |
1 | /******************************************************************************* |
2 | * | |
4119532c | 3 | * Module Name: nseval - Object evaluation, includes control method execution |
1da177e4 LT |
4 | * |
5 | ******************************************************************************/ | |
6 | ||
7 | /* | |
25f044e6 | 8 | * Copyright (C) 2000 - 2013, 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 | 44 | #include <acpi/acpi.h> |
e2f7a777 LB |
45 | #include "accommon.h" |
46 | #include "acparser.h" | |
47 | #include "acinterp.h" | |
48 | #include "acnamesp.h" | |
1da177e4 | 49 | |
1da177e4 | 50 | #define _COMPONENT ACPI_NAMESPACE |
4be44fcd | 51 | ACPI_MODULE_NAME("nseval") |
1da177e4 | 52 | |
7f0c826a LM |
53 | /* Local prototypes */ |
54 | static void | |
55 | acpi_ns_exec_module_code(union acpi_operand_object *method_obj, | |
56 | struct acpi_evaluate_info *info); | |
57 | ||
1da177e4 LT |
58 | /******************************************************************************* |
59 | * | |
4119532c | 60 | * FUNCTION: acpi_ns_evaluate |
1da177e4 | 61 | * |
ba494bee | 62 | * PARAMETERS: info - Evaluation info block, contains: |
4119532c | 63 | * prefix_node - Prefix or Method/Object Node to execute |
29a241cc | 64 | * relative_path - Name of method to execute, If NULL, the |
4119532c | 65 | * Node is the object to execute |
ba494bee | 66 | * parameters - List of parameters to pass to the method, |
44f6c012 | 67 | * terminated by NULL. Params itself may be |
1da177e4 | 68 | * NULL if no parameters are being passed. |
44f6c012 RM |
69 | * return_object - Where to put method's return value (if |
70 | * any). If NULL, no value is returned. | |
71 | * parameter_type - Type of Parameter list | |
72 | * return_object - Where to put method's return value (if | |
73 | * any). If NULL, no value is returned. | |
ba494bee | 74 | * flags - ACPI_IGNORE_RETURN_VALUE to delete return |
1da177e4 LT |
75 | * |
76 | * RETURN: Status | |
77 | * | |
4119532c BM |
78 | * DESCRIPTION: Execute a control method or return the current value of an |
79 | * ACPI namespace object. | |
1da177e4 | 80 | * |
4119532c | 81 | * MUTEX: Locks interpreter |
1da177e4 LT |
82 | * |
83 | ******************************************************************************/ | |
7f0c826a | 84 | |
29a241cc | 85 | acpi_status acpi_ns_evaluate(struct acpi_evaluate_info *info) |
1da177e4 | 86 | { |
4be44fcd | 87 | acpi_status status; |
1da177e4 | 88 | |
4119532c | 89 | ACPI_FUNCTION_TRACE(ns_evaluate); |
1da177e4 LT |
90 | |
91 | if (!info) { | |
4be44fcd | 92 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
93 | } |
94 | ||
29a241cc | 95 | if (!info->node) { |
c34c82bc | 96 | /* |
29a241cc BM |
97 | * Get the actual namespace node for the target object if we |
98 | * need to. Handles these cases: | |
c34c82bc | 99 | * |
29a241cc BM |
100 | * 1) Null node, valid pathname from root (absolute path) |
101 | * 2) Node and valid pathname (path relative to Node) | |
102 | * 3) Node, Null pathname | |
c34c82bc | 103 | */ |
29a241cc BM |
104 | status = |
105 | acpi_ns_get_node(info->prefix_node, info->relative_pathname, | |
106 | ACPI_NS_NO_UPSEARCH, &info->node); | |
c34c82bc BM |
107 | if (ACPI_FAILURE(status)) { |
108 | return_ACPI_STATUS(status); | |
109 | } | |
1da177e4 LT |
110 | } |
111 | ||
1da177e4 | 112 | /* |
29a241cc BM |
113 | * For a method alias, we must grab the actual method node so that |
114 | * proper scoping context will be established before execution. | |
1da177e4 | 115 | */ |
29a241cc BM |
116 | if (acpi_ns_get_type(info->node) == ACPI_TYPE_LOCAL_METHOD_ALIAS) { |
117 | info->node = | |
4be44fcd | 118 | ACPI_CAST_PTR(struct acpi_namespace_node, |
29a241cc BM |
119 | info->node->object); |
120 | } | |
121 | ||
122 | /* Complete the info block initialization */ | |
123 | ||
124 | info->return_object = NULL; | |
125 | info->node_flags = info->node->flags; | |
126 | info->obj_desc = acpi_ns_get_attached_object(info->node); | |
127 | ||
128 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "%s [%p] Value %p\n", | |
129 | info->relative_pathname, info->node, | |
130 | acpi_ns_get_attached_object(info->node))); | |
131 | ||
132 | /* Get info if we have a predefined name (_HID, etc.) */ | |
133 | ||
134 | info->predefined = | |
135 | acpi_ut_match_predefined_method(info->node->name.ascii); | |
136 | ||
137 | /* Get the full pathname to the object, for use in warning messages */ | |
138 | ||
139 | info->full_pathname = acpi_ns_get_external_pathname(info->node); | |
140 | if (!info->full_pathname) { | |
141 | return_ACPI_STATUS(AE_NO_MEMORY); | |
1da177e4 LT |
142 | } |
143 | ||
29a241cc BM |
144 | /* Count the number of arguments being passed in */ |
145 | ||
146 | info->param_count = 0; | |
147 | if (info->parameters) { | |
148 | while (info->parameters[info->param_count]) { | |
149 | info->param_count++; | |
150 | } | |
4119532c | 151 | |
29a241cc BM |
152 | /* Warn on impossible argument count */ |
153 | ||
154 | if (info->param_count > ACPI_METHOD_NUM_ARGS) { | |
155 | ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, | |
156 | ACPI_WARN_ALWAYS, | |
157 | "Excess arguments (%u) - using only %u", | |
158 | info->param_count, | |
159 | ACPI_METHOD_NUM_ARGS)); | |
160 | ||
161 | info->param_count = ACPI_METHOD_NUM_ARGS; | |
162 | } | |
163 | } | |
164 | ||
165 | /* | |
166 | * For predefined names: Check that the declared argument count | |
167 | * matches the ACPI spec -- otherwise this is a BIOS error. | |
168 | */ | |
169 | acpi_ns_check_acpi_compliance(info->full_pathname, info->node, | |
170 | info->predefined); | |
e8707b34 | 171 | |
1da177e4 | 172 | /* |
29a241cc BM |
173 | * For all names: Check that the incoming argument count for |
174 | * this method/object matches the actual ASL/AML definition. | |
175 | */ | |
176 | acpi_ns_check_argument_count(info->full_pathname, info->node, | |
177 | info->param_count, info->predefined); | |
178 | ||
179 | /* For predefined names: Typecheck all incoming arguments */ | |
180 | ||
181 | acpi_ns_check_argument_types(info); | |
182 | ||
183 | /* | |
184 | * Three major evaluation cases: | |
1da177e4 | 185 | * |
29a241cc BM |
186 | * 1) Object types that cannot be evaluated by definition |
187 | * 2) The object is a control method -- execute it | |
188 | * 3) The object is not a method -- just return it's current value | |
1da177e4 | 189 | */ |
29a241cc BM |
190 | switch (acpi_ns_get_type(info->node)) { |
191 | case ACPI_TYPE_DEVICE: | |
192 | case ACPI_TYPE_EVENT: | |
193 | case ACPI_TYPE_MUTEX: | |
194 | case ACPI_TYPE_REGION: | |
195 | case ACPI_TYPE_THERMAL: | |
196 | case ACPI_TYPE_LOCAL_SCOPE: | |
197 | /* | |
198 | * 1) Disallow evaluation of certain object types. For these, | |
199 | * object evaluation is undefined and not supported. | |
200 | */ | |
201 | ACPI_ERROR((AE_INFO, | |
202 | "%s: Evaluation of object type [%s] is not supported", | |
203 | info->full_pathname, | |
204 | acpi_ut_get_type_name(info->node->type))); | |
205 | ||
206 | status = AE_TYPE; | |
207 | goto cleanup; | |
208 | ||
209 | case ACPI_TYPE_METHOD: | |
1da177e4 | 210 | /* |
29a241cc | 211 | * 2) Object is a control method - execute it |
1da177e4 | 212 | */ |
1da177e4 | 213 | |
4119532c | 214 | /* Verify that there is a method object associated with this node */ |
1da177e4 | 215 | |
4119532c BM |
216 | if (!info->obj_desc) { |
217 | ACPI_ERROR((AE_INFO, | |
29a241cc BM |
218 | "%s: Method has no attached sub-object", |
219 | info->full_pathname)); | |
220 | status = AE_NULL_OBJECT; | |
221 | goto cleanup; | |
4119532c | 222 | } |
1da177e4 | 223 | |
4119532c | 224 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
29a241cc BM |
225 | "**** Execute method [%s] at AML address %p length %X\n", |
226 | info->full_pathname, | |
4119532c BM |
227 | info->obj_desc->method.aml_start + 1, |
228 | info->obj_desc->method.aml_length - 1)); | |
1da177e4 | 229 | |
4119532c BM |
230 | /* |
231 | * Any namespace deletion must acquire both the namespace and | |
232 | * interpreter locks to ensure that no thread is using the portion of | |
233 | * the namespace that is being deleted. | |
234 | * | |
235 | * Execute the method via the interpreter. The interpreter is locked | |
236 | * here before calling into the AML parser | |
237 | */ | |
4d2acd9e | 238 | acpi_ex_enter_interpreter(); |
4119532c BM |
239 | status = acpi_ps_execute_method(info); |
240 | acpi_ex_exit_interpreter(); | |
29a241cc BM |
241 | break; |
242 | ||
243 | default: | |
4119532c | 244 | /* |
29a241cc | 245 | * 3) All other non-method objects -- get the current object value |
4119532c | 246 | */ |
1da177e4 | 247 | |
4119532c | 248 | /* |
29a241cc BM |
249 | * Some objects require additional resolution steps (e.g., the Node |
250 | * may be a field that must be read, etc.) -- we can't just grab | |
251 | * the object out of the node. | |
4119532c BM |
252 | * |
253 | * Use resolve_node_to_value() to get the associated value. | |
254 | * | |
255 | * NOTE: we can get away with passing in NULL for a walk state because | |
29a241cc | 256 | * the Node is guaranteed to not be a reference to either a method |
4119532c BM |
257 | * local or a method argument (because this interface is never called |
258 | * from a running method.) | |
259 | * | |
260 | * Even though we do not directly invoke the interpreter for object | |
29a241cc BM |
261 | * resolution, we must lock it because we could access an op_region. |
262 | * The op_region access code assumes that the interpreter is locked. | |
4119532c | 263 | */ |
4d2acd9e | 264 | acpi_ex_enter_interpreter(); |
1da177e4 | 265 | |
29a241cc BM |
266 | /* TBD: resolve_node_to_value has a strange interface, fix */ |
267 | ||
268 | info->return_object = | |
269 | ACPI_CAST_PTR(union acpi_operand_object, info->node); | |
1da177e4 | 270 | |
4119532c | 271 | status = |
29a241cc BM |
272 | acpi_ex_resolve_node_to_value(ACPI_CAST_INDIRECT_PTR |
273 | (struct acpi_namespace_node, | |
274 | &info->return_object), NULL); | |
4119532c | 275 | acpi_ex_exit_interpreter(); |
1da177e4 | 276 | |
29a241cc BM |
277 | if (ACPI_FAILURE(status)) { |
278 | goto cleanup; | |
1da177e4 | 279 | } |
29a241cc BM |
280 | |
281 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, "Returned object %p [%s]\n", | |
282 | info->return_object, | |
283 | acpi_ut_get_object_type_name(info-> | |
284 | return_object))); | |
285 | ||
286 | status = AE_CTRL_RETURN_VALUE; /* Always has a "return value" */ | |
287 | break; | |
1da177e4 LT |
288 | } |
289 | ||
eeb4437e | 290 | /* |
29a241cc BM |
291 | * For predefined names, check the return value against the ACPI |
292 | * specification. Some incorrect return value types are repaired. | |
eeb4437e | 293 | */ |
29a241cc BM |
294 | (void)acpi_ns_check_return_value(info->node, info, info->param_count, |
295 | status, &info->return_object); | |
e8707b34 BM |
296 | |
297 | /* Check if there is a return value that must be dealt with */ | |
298 | ||
4119532c BM |
299 | if (status == AE_CTRL_RETURN_VALUE) { |
300 | ||
301 | /* If caller does not want the return value, delete it */ | |
1da177e4 | 302 | |
4119532c BM |
303 | if (info->flags & ACPI_IGNORE_RETURN_VALUE) { |
304 | acpi_ut_remove_reference(info->return_object); | |
305 | info->return_object = NULL; | |
306 | } | |
307 | ||
308 | /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */ | |
309 | ||
310 | status = AE_OK; | |
311 | } | |
312 | ||
313 | ACPI_DEBUG_PRINT((ACPI_DB_NAMES, | |
314 | "*** Completed evaluation of object %s ***\n", | |
29a241cc | 315 | info->relative_pathname)); |
4119532c | 316 | |
29a241cc | 317 | cleanup: |
4119532c BM |
318 | /* |
319 | * Namespace was unlocked by the handling acpi_ns* function, so we | |
29a241cc | 320 | * just free the pathname and return |
4119532c | 321 | */ |
29a241cc BM |
322 | ACPI_FREE(info->full_pathname); |
323 | info->full_pathname = NULL; | |
4be44fcd | 324 | return_ACPI_STATUS(status); |
1da177e4 | 325 | } |
7f0c826a LM |
326 | |
327 | /******************************************************************************* | |
328 | * | |
329 | * FUNCTION: acpi_ns_exec_module_code_list | |
330 | * | |
331 | * PARAMETERS: None | |
332 | * | |
333 | * RETURN: None. Exceptions during method execution are ignored, since | |
334 | * we cannot abort a table load. | |
335 | * | |
336 | * DESCRIPTION: Execute all elements of the global module-level code list. | |
337 | * Each element is executed as a single control method. | |
338 | * | |
339 | ******************************************************************************/ | |
340 | ||
341 | void acpi_ns_exec_module_code_list(void) | |
342 | { | |
343 | union acpi_operand_object *prev; | |
344 | union acpi_operand_object *next; | |
345 | struct acpi_evaluate_info *info; | |
346 | u32 method_count = 0; | |
347 | ||
348 | ACPI_FUNCTION_TRACE(ns_exec_module_code_list); | |
349 | ||
350 | /* Exit now if the list is empty */ | |
351 | ||
352 | next = acpi_gbl_module_code_list; | |
353 | if (!next) { | |
354 | return_VOID; | |
355 | } | |
356 | ||
357 | /* Allocate the evaluation information block */ | |
358 | ||
359 | info = ACPI_ALLOCATE(sizeof(struct acpi_evaluate_info)); | |
360 | if (!info) { | |
361 | return_VOID; | |
362 | } | |
363 | ||
364 | /* Walk the list, executing each "method" */ | |
365 | ||
366 | while (next) { | |
367 | prev = next; | |
368 | next = next->method.mutex; | |
369 | ||
370 | /* Clear the link field and execute the method */ | |
371 | ||
372 | prev->method.mutex = NULL; | |
373 | acpi_ns_exec_module_code(prev, info); | |
374 | method_count++; | |
375 | ||
376 | /* Delete the (temporary) method object */ | |
377 | ||
378 | acpi_ut_remove_reference(prev); | |
379 | } | |
380 | ||
381 | ACPI_INFO((AE_INFO, | |
382 | "Executed %u blocks of module-level executable AML code", | |
383 | method_count)); | |
384 | ||
385 | ACPI_FREE(info); | |
386 | acpi_gbl_module_code_list = NULL; | |
387 | return_VOID; | |
388 | } | |
389 | ||
390 | /******************************************************************************* | |
391 | * | |
392 | * FUNCTION: acpi_ns_exec_module_code | |
393 | * | |
394 | * PARAMETERS: method_obj - Object container for the module-level code | |
ba494bee | 395 | * info - Info block for method evaluation |
7f0c826a LM |
396 | * |
397 | * RETURN: None. Exceptions during method execution are ignored, since | |
398 | * we cannot abort a table load. | |
399 | * | |
400 | * DESCRIPTION: Execute a control method containing a block of module-level | |
401 | * executable AML code. The control method is temporarily | |
402 | * installed to the root node, then evaluated. | |
403 | * | |
404 | ******************************************************************************/ | |
405 | ||
406 | static void | |
407 | acpi_ns_exec_module_code(union acpi_operand_object *method_obj, | |
408 | struct acpi_evaluate_info *info) | |
409 | { | |
9a884ab6 LM |
410 | union acpi_operand_object *parent_obj; |
411 | struct acpi_namespace_node *parent_node; | |
412 | acpi_object_type type; | |
7f0c826a LM |
413 | acpi_status status; |
414 | ||
415 | ACPI_FUNCTION_TRACE(ns_exec_module_code); | |
416 | ||
9a884ab6 LM |
417 | /* |
418 | * Get the parent node. We cheat by using the next_object field | |
419 | * of the method object descriptor. | |
420 | */ | |
421 | parent_node = ACPI_CAST_PTR(struct acpi_namespace_node, | |
422 | method_obj->method.next_object); | |
423 | type = acpi_ns_get_type(parent_node); | |
424 | ||
e31c32cf LM |
425 | /* |
426 | * Get the region handler and save it in the method object. We may need | |
427 | * this if an operation region declaration causes a _REG method to be run. | |
428 | * | |
429 | * We can't do this in acpi_ps_link_module_code because | |
430 | * acpi_gbl_root_node->Object is NULL at PASS1. | |
431 | */ | |
432 | if ((type == ACPI_TYPE_DEVICE) && parent_node->object) { | |
26294842 | 433 | method_obj->method.dispatch.handler = |
e31c32cf LM |
434 | parent_node->object->device.handler; |
435 | } | |
436 | ||
9a884ab6 LM |
437 | /* Must clear next_object (acpi_ns_attach_object needs the field) */ |
438 | ||
439 | method_obj->method.next_object = NULL; | |
440 | ||
7f0c826a LM |
441 | /* Initialize the evaluation information block */ |
442 | ||
443 | ACPI_MEMSET(info, 0, sizeof(struct acpi_evaluate_info)); | |
9a884ab6 | 444 | info->prefix_node = parent_node; |
7f0c826a LM |
445 | |
446 | /* | |
9a884ab6 | 447 | * Get the currently attached parent object. Add a reference, because the |
7f0c826a | 448 | * ref count will be decreased when the method object is installed to |
9a884ab6 | 449 | * the parent node. |
7f0c826a | 450 | */ |
9a884ab6 LM |
451 | parent_obj = acpi_ns_get_attached_object(parent_node); |
452 | if (parent_obj) { | |
453 | acpi_ut_add_reference(parent_obj); | |
454 | } | |
7f0c826a | 455 | |
9a884ab6 | 456 | /* Install the method (module-level code) in the parent node */ |
7f0c826a | 457 | |
9a884ab6 | 458 | status = acpi_ns_attach_object(parent_node, method_obj, |
7f0c826a LM |
459 | ACPI_TYPE_METHOD); |
460 | if (ACPI_FAILURE(status)) { | |
461 | goto exit; | |
462 | } | |
463 | ||
9a884ab6 | 464 | /* Execute the parent node as a control method */ |
7f0c826a LM |
465 | |
466 | status = acpi_ns_evaluate(info); | |
467 | ||
468 | ACPI_DEBUG_PRINT((ACPI_DB_INIT, "Executed module-level code at %p\n", | |
469 | method_obj->method.aml_start)); | |
470 | ||
583061c5 LM |
471 | /* Delete a possible implicit return value (in slack mode) */ |
472 | ||
473 | if (info->return_object) { | |
474 | acpi_ut_remove_reference(info->return_object); | |
475 | } | |
476 | ||
7f0c826a LM |
477 | /* Detach the temporary method object */ |
478 | ||
9a884ab6 | 479 | acpi_ns_detach_object(parent_node); |
7f0c826a | 480 | |
9a884ab6 | 481 | /* Restore the original parent object */ |
7f0c826a | 482 | |
9a884ab6 LM |
483 | if (parent_obj) { |
484 | status = acpi_ns_attach_object(parent_node, parent_obj, type); | |
485 | } else { | |
486 | parent_node->type = (u8)type; | |
487 | } | |
7f0c826a LM |
488 | |
489 | exit: | |
9a884ab6 LM |
490 | if (parent_obj) { |
491 | acpi_ut_remove_reference(parent_obj); | |
492 | } | |
7f0c826a LM |
493 | return_VOID; |
494 | } |