1 /*******************************************************************************
2 *
3 * Module Name: nseval - Object evaluation, includes control method execution
4 *
5 ******************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2016, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #include "acpi.h"
45 #include "accommon.h"
46 #include "acparser.h"
47 #include "acinterp.h"
48 #include "acnamesp.h"
49
50
51 #define _COMPONENT ACPI_NAMESPACE
52 ACPI_MODULE_NAME ("nseval")
53
54 /* Local prototypes */
55
56 static void
57 AcpiNsExecModuleCode (
58 ACPI_OPERAND_OBJECT *MethodObj,
59 ACPI_EVALUATE_INFO *Info);
60
61
62 /*******************************************************************************
63 *
64 * FUNCTION: AcpiNsEvaluate
65 *
66 * PARAMETERS: Info - Evaluation info block, contains these fields
67 * and more:
68 * PrefixNode - Prefix or Method/Object Node to execute
69 * RelativePath - Name of method to execute, If NULL, the
70 * Node is the object to execute
71 * Parameters - List of parameters to pass to the method,
72 * terminated by NULL. Params itself may be
73 * NULL if no parameters are being passed.
74 * ParameterType - Type of Parameter list
75 * ReturnObject - Where to put method's return value (if
76 * any). If NULL, no value is returned.
77 * Flags - ACPI_IGNORE_RETURN_VALUE to delete return
78 *
79 * RETURN: Status
80 *
81 * DESCRIPTION: Execute a control method or return the current value of an
82 * ACPI namespace object.
83 *
84 * MUTEX: Locks interpreter
85 *
86 ******************************************************************************/
87
88 ACPI_STATUS
AcpiNsEvaluate(ACPI_EVALUATE_INFO * Info)89 AcpiNsEvaluate (
90 ACPI_EVALUATE_INFO *Info)
91 {
92 ACPI_STATUS Status;
93
94
95 ACPI_FUNCTION_TRACE (NsEvaluate);
96
97
98 if (!Info)
99 {
100 return_ACPI_STATUS (AE_BAD_PARAMETER);
101 }
102
103 if (!Info->Node)
104 {
105 /*
106 * Get the actual namespace node for the target object if we
107 * need to. Handles these cases:
108 *
109 * 1) Null node, valid pathname from root (absolute path)
110 * 2) Node and valid pathname (path relative to Node)
111 * 3) Node, Null pathname
112 */
113 Status = AcpiNsGetNode (Info->PrefixNode, Info->RelativePathname,
114 ACPI_NS_NO_UPSEARCH, &Info->Node);
115 if (ACPI_FAILURE (Status))
116 {
117 return_ACPI_STATUS (Status);
118 }
119 }
120
121 /*
122 * For a method alias, we must grab the actual method node so that
123 * proper scoping context will be established before execution.
124 */
125 if (AcpiNsGetType (Info->Node) == ACPI_TYPE_LOCAL_METHOD_ALIAS)
126 {
127 Info->Node = ACPI_CAST_PTR (
128 ACPI_NAMESPACE_NODE, Info->Node->Object);
129 }
130
131 /* Complete the info block initialization */
132
133 Info->ReturnObject = NULL;
134 Info->NodeFlags = Info->Node->Flags;
135 Info->ObjDesc = AcpiNsGetAttachedObject (Info->Node);
136
137 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n",
138 Info->RelativePathname, Info->Node,
139 AcpiNsGetAttachedObject (Info->Node)));
140
141 /* Get info if we have a predefined name (_HID, etc.) */
142
143 Info->Predefined = AcpiUtMatchPredefinedMethod (Info->Node->Name.Ascii);
144
145 /* Get the full pathname to the object, for use in warning messages */
146
147 Info->FullPathname = AcpiNsGetNormalizedPathname (Info->Node, TRUE);
148 if (!Info->FullPathname)
149 {
150 return_ACPI_STATUS (AE_NO_MEMORY);
151 }
152
153 /* Count the number of arguments being passed in */
154
155 Info->ParamCount = 0;
156 if (Info->Parameters)
157 {
158 while (Info->Parameters[Info->ParamCount])
159 {
160 Info->ParamCount++;
161 }
162
163 /* Warn on impossible argument count */
164
165 if (Info->ParamCount > ACPI_METHOD_NUM_ARGS)
166 {
167 ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, ACPI_WARN_ALWAYS,
168 "Excess arguments (%u) - using only %u",
169 Info->ParamCount, ACPI_METHOD_NUM_ARGS));
170
171 Info->ParamCount = ACPI_METHOD_NUM_ARGS;
172 }
173 }
174
175 /*
176 * For predefined names: Check that the declared argument count
177 * matches the ACPI spec -- otherwise this is a BIOS error.
178 */
179 AcpiNsCheckAcpiCompliance (Info->FullPathname, Info->Node,
180 Info->Predefined);
181
182 /*
183 * For all names: Check that the incoming argument count for
184 * this method/object matches the actual ASL/AML definition.
185 */
186 AcpiNsCheckArgumentCount (Info->FullPathname, Info->Node,
187 Info->ParamCount, Info->Predefined);
188
189 /* For predefined names: Typecheck all incoming arguments */
190
191 AcpiNsCheckArgumentTypes (Info);
192
193 /*
194 * Three major evaluation cases:
195 *
196 * 1) Object types that cannot be evaluated by definition
197 * 2) The object is a control method -- execute it
198 * 3) The object is not a method -- just return it's current value
199 */
200 switch (AcpiNsGetType (Info->Node))
201 {
202 case ACPI_TYPE_DEVICE:
203 case ACPI_TYPE_EVENT:
204 case ACPI_TYPE_MUTEX:
205 case ACPI_TYPE_REGION:
206 case ACPI_TYPE_THERMAL:
207 case ACPI_TYPE_LOCAL_SCOPE:
208 /*
209 * 1) Disallow evaluation of certain object types. For these,
210 * object evaluation is undefined and not supported.
211 */
212 ACPI_ERROR ((AE_INFO,
213 "%s: Evaluation of object type [%s] is not supported",
214 Info->FullPathname,
215 AcpiUtGetTypeName (Info->Node->Type)));
216
217 Status = AE_TYPE;
218 goto Cleanup;
219
220 case ACPI_TYPE_METHOD:
221 /*
222 * 2) Object is a control method - execute it
223 */
224
225 /* Verify that there is a method object associated with this node */
226
227 if (!Info->ObjDesc)
228 {
229 ACPI_ERROR ((AE_INFO, "%s: Method has no attached sub-object",
230 Info->FullPathname));
231 Status = AE_NULL_OBJECT;
232 goto Cleanup;
233 }
234
235 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
236 "**** Execute method [%s] at AML address %p length %X\n",
237 Info->FullPathname,
238 Info->ObjDesc->Method.AmlStart + 1,
239 Info->ObjDesc->Method.AmlLength - 1));
240
241 /*
242 * Any namespace deletion must acquire both the namespace and
243 * interpreter locks to ensure that no thread is using the portion of
244 * the namespace that is being deleted.
245 *
246 * Execute the method via the interpreter. The interpreter is locked
247 * here before calling into the AML parser
248 */
249 AcpiExEnterInterpreter ();
250 Status = AcpiPsExecuteMethod (Info);
251 AcpiExExitInterpreter ();
252 break;
253
254 default:
255 /*
256 * 3) All other non-method objects -- get the current object value
257 */
258
259 /*
260 * Some objects require additional resolution steps (e.g., the Node
261 * may be a field that must be read, etc.) -- we can't just grab
262 * the object out of the node.
263 *
264 * Use ResolveNodeToValue() to get the associated value.
265 *
266 * NOTE: we can get away with passing in NULL for a walk state because
267 * the Node is guaranteed to not be a reference to either a method
268 * local or a method argument (because this interface is never called
269 * from a running method.)
270 *
271 * Even though we do not directly invoke the interpreter for object
272 * resolution, we must lock it because we could access an OpRegion.
273 * The OpRegion access code assumes that the interpreter is locked.
274 */
275 AcpiExEnterInterpreter ();
276
277 /* TBD: ResolveNodeToValue has a strange interface, fix */
278
279 Info->ReturnObject = ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, Info->Node);
280
281 Status = AcpiExResolveNodeToValue (ACPI_CAST_INDIRECT_PTR (
282 ACPI_NAMESPACE_NODE, &Info->ReturnObject), NULL);
283 AcpiExExitInterpreter ();
284
285 if (ACPI_FAILURE (Status))
286 {
287 Info->ReturnObject = NULL;
288 goto Cleanup;
289 }
290
291 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Returned object %p [%s]\n",
292 Info->ReturnObject,
293 AcpiUtGetObjectTypeName (Info->ReturnObject)));
294
295 Status = AE_CTRL_RETURN_VALUE; /* Always has a "return value" */
296 break;
297 }
298
299 /*
300 * For predefined names, check the return value against the ACPI
301 * specification. Some incorrect return value types are repaired.
302 */
303 (void) AcpiNsCheckReturnValue (Info->Node, Info, Info->ParamCount,
304 Status, &Info->ReturnObject);
305
306 /* Check if there is a return value that must be dealt with */
307
308 if (Status == AE_CTRL_RETURN_VALUE)
309 {
310 /* If caller does not want the return value, delete it */
311
312 if (Info->Flags & ACPI_IGNORE_RETURN_VALUE)
313 {
314 AcpiUtRemoveReference (Info->ReturnObject);
315 Info->ReturnObject = NULL;
316 }
317
318 /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */
319
320 Status = AE_OK;
321 }
322
323 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
324 "*** Completed evaluation of object %s ***\n",
325 Info->RelativePathname));
326
327 Cleanup:
328 /*
329 * Namespace was unlocked by the handling AcpiNs* function, so we
330 * just free the pathname and return
331 */
332 ACPI_FREE (Info->FullPathname);
333 Info->FullPathname = NULL;
334 return_ACPI_STATUS (Status);
335 }
336
337
338 /*******************************************************************************
339 *
340 * FUNCTION: AcpiNsExecModuleCodeList
341 *
342 * PARAMETERS: None
343 *
344 * RETURN: None. Exceptions during method execution are ignored, since
345 * we cannot abort a table load.
346 *
347 * DESCRIPTION: Execute all elements of the global module-level code list.
348 * Each element is executed as a single control method.
349 *
350 ******************************************************************************/
351
352 void
AcpiNsExecModuleCodeList(void)353 AcpiNsExecModuleCodeList (
354 void)
355 {
356 ACPI_OPERAND_OBJECT *Prev;
357 ACPI_OPERAND_OBJECT *Next;
358 ACPI_EVALUATE_INFO *Info;
359 UINT32 MethodCount = 0;
360
361
362 ACPI_FUNCTION_TRACE (NsExecModuleCodeList);
363
364
365 /* Exit now if the list is empty */
366
367 Next = AcpiGbl_ModuleCodeList;
368 if (!Next)
369 {
370 return_VOID;
371 }
372
373 /* Allocate the evaluation information block */
374
375 Info = ACPI_ALLOCATE (sizeof (ACPI_EVALUATE_INFO));
376 if (!Info)
377 {
378 return_VOID;
379 }
380
381 /* Walk the list, executing each "method" */
382
383 while (Next)
384 {
385 Prev = Next;
386 Next = Next->Method.Mutex;
387
388 /* Clear the link field and execute the method */
389
390 Prev->Method.Mutex = NULL;
391 AcpiNsExecModuleCode (Prev, Info);
392 MethodCount++;
393
394 /* Delete the (temporary) method object */
395
396 AcpiUtRemoveReference (Prev);
397 }
398
399 ACPI_INFO ((
400 "Executed %u blocks of module-level executable AML code",
401 MethodCount));
402
403 ACPI_FREE (Info);
404 AcpiGbl_ModuleCodeList = NULL;
405 return_VOID;
406 }
407
408
409 /*******************************************************************************
410 *
411 * FUNCTION: AcpiNsExecModuleCode
412 *
413 * PARAMETERS: MethodObj - Object container for the module-level code
414 * Info - Info block for method evaluation
415 *
416 * RETURN: None. Exceptions during method execution are ignored, since
417 * we cannot abort a table load.
418 *
419 * DESCRIPTION: Execute a control method containing a block of module-level
420 * executable AML code. The control method is temporarily
421 * installed to the root node, then evaluated.
422 *
423 ******************************************************************************/
424
425 static void
AcpiNsExecModuleCode(ACPI_OPERAND_OBJECT * MethodObj,ACPI_EVALUATE_INFO * Info)426 AcpiNsExecModuleCode (
427 ACPI_OPERAND_OBJECT *MethodObj,
428 ACPI_EVALUATE_INFO *Info)
429 {
430 ACPI_OPERAND_OBJECT *ParentObj;
431 ACPI_NAMESPACE_NODE *ParentNode;
432 ACPI_OBJECT_TYPE Type;
433 ACPI_STATUS Status;
434
435
436 ACPI_FUNCTION_TRACE (NsExecModuleCode);
437
438
439 /*
440 * Get the parent node. We cheat by using the NextObject field
441 * of the method object descriptor.
442 */
443 ParentNode = ACPI_CAST_PTR (
444 ACPI_NAMESPACE_NODE, MethodObj->Method.NextObject);
445 Type = AcpiNsGetType (ParentNode);
446
447 /*
448 * Get the region handler and save it in the method object. We may need
449 * this if an operation region declaration causes a _REG method to be run.
450 *
451 * We can't do this in AcpiPsLinkModuleCode because
452 * AcpiGbl_RootNode->Object is NULL at PASS1.
453 */
454 if ((Type == ACPI_TYPE_DEVICE) && ParentNode->Object)
455 {
456 MethodObj->Method.Dispatch.Handler =
457 ParentNode->Object->Device.Handler;
458 }
459
460 /* Must clear NextObject (AcpiNsAttachObject needs the field) */
461
462 MethodObj->Method.NextObject = NULL;
463
464 /* Initialize the evaluation information block */
465
466 memset (Info, 0, sizeof (ACPI_EVALUATE_INFO));
467 Info->PrefixNode = ParentNode;
468
469 /*
470 * Get the currently attached parent object. Add a reference,
471 * because the ref count will be decreased when the method object
472 * is installed to the parent node.
473 */
474 ParentObj = AcpiNsGetAttachedObject (ParentNode);
475 if (ParentObj)
476 {
477 AcpiUtAddReference (ParentObj);
478 }
479
480 /* Install the method (module-level code) in the parent node */
481
482 Status = AcpiNsAttachObject (ParentNode, MethodObj, ACPI_TYPE_METHOD);
483 if (ACPI_FAILURE (Status))
484 {
485 goto Exit;
486 }
487
488 /* Execute the parent node as a control method */
489
490 Status = AcpiNsEvaluate (Info);
491
492 ACPI_DEBUG_PRINT ((ACPI_DB_INIT_NAMES,
493 "Executed module-level code at %p\n",
494 MethodObj->Method.AmlStart));
495
496 /* Delete a possible implicit return value (in slack mode) */
497
498 if (Info->ReturnObject)
499 {
500 AcpiUtRemoveReference (Info->ReturnObject);
501 }
502
503 /* Detach the temporary method object */
504
505 AcpiNsDetachObject (ParentNode);
506
507 /* Restore the original parent object */
508
509 if (ParentObj)
510 {
511 Status = AcpiNsAttachObject (ParentNode, ParentObj, Type);
512 }
513 else
514 {
515 ParentNode->Type = (UINT8) Type;
516 }
517
518 Exit:
519 if (ParentObj)
520 {
521 AcpiUtRemoveReference (ParentObj);
522 }
523 return_VOID;
524 }
525