1 /******************************************************************************
2 *
3 * Module Name: nsinit - namespace initialization
4 *
5 *****************************************************************************/
6
7 /******************************************************************************
8 *
9 * 1. Copyright Notice
10 *
11 * Some or all of this work - Copyright (c) 1999 - 2009, Intel Corp.
12 * All rights reserved.
13 *
14 * 2. License
15 *
16 * 2.1. This is your license from Intel Corp. under its intellectual property
17 * rights. You may have additional license terms from the party that provided
18 * you this software, covering your right to use that party's intellectual
19 * property rights.
20 *
21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22 * copy of the source code appearing in this file ("Covered Code") an
23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24 * base code distributed originally by Intel ("Original Intel Code") to copy,
25 * make derivatives, distribute, use and display any portion of the Covered
26 * Code in any form, with the right to sublicense such rights; and
27 *
28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29 * license (with the right to sublicense), under only those claims of Intel
30 * patents that are infringed by the Original Intel Code, to make, use, sell,
31 * offer to sell, and import the Covered Code and derivative works thereof
32 * solely to the minimum extent necessary to exercise the above copyright
33 * license, and in no event shall the patent license extend to any additions
34 * to or modifications of the Original Intel Code. No other license or right
35 * is granted directly or by implication, estoppel or otherwise;
36 *
37 * The above copyright and patent license is granted only if the following
38 * conditions are met:
39 *
40 * 3. Conditions
41 *
42 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43 * Redistribution of source code of any substantial portion of the Covered
44 * Code or modification with rights to further distribute source must include
45 * the above Copyright Notice, the above License, this list of Conditions,
46 * and the following Disclaimer and Export Compliance provision. In addition,
47 * Licensee must cause all Covered Code to which Licensee contributes to
48 * contain a file documenting the changes Licensee made to create that Covered
49 * Code and the date of any change. Licensee must include in that file the
50 * documentation of any changes made by any predecessor Licensee. Licensee
51 * must include a prominent statement that the modification is derived,
52 * directly or indirectly, from Original Intel Code.
53 *
54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55 * Redistribution of source code of any substantial portion of the Covered
56 * Code or modification without rights to further distribute source must
57 * include the following Disclaimer and Export Compliance provision in the
58 * documentation and/or other materials provided with distribution. In
59 * addition, Licensee may not authorize further sublicense of source of any
60 * portion of the Covered Code, and must include terms to the effect that the
61 * license from Licensee to its licensee is limited to the intellectual
62 * property embodied in the software Licensee provides to its licensee, and
63 * not to intellectual property embodied in modifications its licensee may
64 * make.
65 *
66 * 3.3. Redistribution of Executable. Redistribution in executable form of any
67 * substantial portion of the Covered Code or modification must reproduce the
68 * above Copyright Notice, and the following Disclaimer and Export Compliance
69 * provision in the documentation and/or other materials provided with the
70 * distribution.
71 *
72 * 3.4. Intel retains all right, title, and interest in and to the Original
73 * Intel Code.
74 *
75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
76 * Intel shall be used in advertising or otherwise to promote the sale, use or
77 * other dealings in products derived from or relating to the Covered Code
78 * without prior written authorization from Intel.
79 *
80 * 4. Disclaimer and Export Compliance
81 *
82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
88 * PARTICULAR PURPOSE.
89 *
90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
97 * LIMITED REMEDY.
98 *
99 * 4.3. Licensee shall not export, either directly or indirectly, any of this
100 * software or system incorporating such software without first obtaining any
101 * required license or other approval from the U. S. Department of Commerce or
102 * any other agency or department of the United States Government. In the
103 * event Licensee exports any such software from the United States or
104 * re-exports any such software from a foreign destination, Licensee shall
105 * ensure that the distribution and export/re-export of the software is in
106 * compliance with all laws, regulations, orders, or other restrictions of the
107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
108 * any of its subsidiaries will export/re-export any technical data, process,
109 * software, or service, directly or indirectly, to any country for which the
110 * United States government or any agency thereof requires an export license,
111 * other governmental approval, or letter of assurance, without first obtaining
112 * such license, approval or letter.
113 *
114 *****************************************************************************/
115
116
117 #define __NSXFINIT_C__
118
119 #include "acpi.h"
120 #include "accommon.h"
121 #include "acnamesp.h"
122 #include "acdispat.h"
123 #include "acinterp.h"
124
125 #define _COMPONENT ACPI_NAMESPACE
126 ACPI_MODULE_NAME ("nsinit")
127
128 /* Local prototypes */
129
130 static ACPI_STATUS
131 AcpiNsInitOneObject (
132 ACPI_HANDLE ObjHandle,
133 UINT32 Level,
134 void *Context,
135 void **ReturnValue);
136
137 static ACPI_STATUS
138 AcpiNsInitOneDevice (
139 ACPI_HANDLE ObjHandle,
140 UINT32 NestingLevel,
141 void *Context,
142 void **ReturnValue);
143
144 static ACPI_STATUS
145 AcpiNsFindIniMethods (
146 ACPI_HANDLE ObjHandle,
147 UINT32 NestingLevel,
148 void *Context,
149 void **ReturnValue);
150
151
152 /*******************************************************************************
153 *
154 * FUNCTION: AcpiNsInitializeObjects
155 *
156 * PARAMETERS: None
157 *
158 * RETURN: Status
159 *
160 * DESCRIPTION: Walk the entire namespace and perform any necessary
161 * initialization on the objects found therein
162 *
163 ******************************************************************************/
164
165 ACPI_STATUS
AcpiNsInitializeObjects(void)166 AcpiNsInitializeObjects (
167 void)
168 {
169 ACPI_STATUS Status;
170 ACPI_INIT_WALK_INFO Info;
171
172
173 ACPI_FUNCTION_TRACE (NsInitializeObjects);
174
175
176 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
177 "**** Starting initialization of namespace objects ****\n"));
178 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT,
179 "Completing Region/Field/Buffer/Package initialization:"));
180
181 /* Set all init info to zero */
182
183 ACPI_MEMSET (&Info, 0, sizeof (ACPI_INIT_WALK_INFO));
184
185 /* Walk entire namespace from the supplied root */
186
187 Status = AcpiWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
188 ACPI_UINT32_MAX, AcpiNsInitOneObject, NULL,
189 &Info, NULL);
190 if (ACPI_FAILURE (Status))
191 {
192 ACPI_EXCEPTION ((AE_INFO, Status, "During WalkNamespace"));
193 }
194
195 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT,
196 "\nInitialized %hd/%hd Regions %hd/%hd Fields %hd/%hd "
197 "Buffers %hd/%hd Packages (%hd nodes)\n",
198 Info.OpRegionInit, Info.OpRegionCount,
199 Info.FieldInit, Info.FieldCount,
200 Info.BufferInit, Info.BufferCount,
201 Info.PackageInit, Info.PackageCount, Info.ObjectCount));
202
203 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
204 "%hd Control Methods found\n", Info.MethodCount));
205 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
206 "%hd Op Regions found\n", Info.OpRegionCount));
207
208 return_ACPI_STATUS (AE_OK);
209 }
210
211
212 /*******************************************************************************
213 *
214 * FUNCTION: AcpiNsInitializeDevices
215 *
216 * PARAMETERS: None
217 *
218 * RETURN: ACPI_STATUS
219 *
220 * DESCRIPTION: Walk the entire namespace and initialize all ACPI devices.
221 * This means running _INI on all present devices.
222 *
223 * Note: We install PCI config space handler on region access,
224 * not here.
225 *
226 ******************************************************************************/
227
228 ACPI_STATUS
AcpiNsInitializeDevices(void)229 AcpiNsInitializeDevices (
230 void)
231 {
232 ACPI_STATUS Status;
233 ACPI_DEVICE_WALK_INFO Info;
234
235
236 ACPI_FUNCTION_TRACE (NsInitializeDevices);
237
238
239 /* Init counters */
240
241 Info.DeviceCount = 0;
242 Info.Num_STA = 0;
243 Info.Num_INI = 0;
244
245 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT,
246 "Initializing Device/Processor/Thermal objects "
247 "by executing _INI methods:"));
248
249 /* Tree analysis: find all subtrees that contain _INI methods */
250
251 Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
252 ACPI_UINT32_MAX, FALSE, AcpiNsFindIniMethods, NULL, &Info, NULL);
253 if (ACPI_FAILURE (Status))
254 {
255 goto ErrorExit;
256 }
257
258 /* Allocate the evaluation information block */
259
260 Info.EvaluateInfo = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO));
261 if (!Info.EvaluateInfo)
262 {
263 Status = AE_NO_MEMORY;
264 goto ErrorExit;
265 }
266
267 /*
268 * Execute the "global" _INI method that may appear at the root. This
269 * support is provided for Windows compatibility (Vista+) and is not
270 * part of the ACPI specification.
271 */
272 Info.EvaluateInfo->PrefixNode = AcpiGbl_RootNode;
273 Info.EvaluateInfo->Pathname = METHOD_NAME__INI;
274 Info.EvaluateInfo->Parameters = NULL;
275 Info.EvaluateInfo->Flags = ACPI_IGNORE_RETURN_VALUE;
276
277 Status = AcpiNsEvaluate (Info.EvaluateInfo);
278 if (ACPI_SUCCESS (Status))
279 {
280 Info.Num_INI++;
281 }
282
283 /* Walk namespace to execute all _INIs on present devices */
284
285 Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
286 ACPI_UINT32_MAX, FALSE, AcpiNsInitOneDevice, NULL, &Info, NULL);
287
288 ACPI_FREE (Info.EvaluateInfo);
289 if (ACPI_FAILURE (Status))
290 {
291 goto ErrorExit;
292 }
293
294 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT,
295 "\nExecuted %hd _INI methods requiring %hd _STA executions "
296 "(examined %hd objects)\n",
297 Info.Num_INI, Info.Num_STA, Info.DeviceCount));
298
299 return_ACPI_STATUS (Status);
300
301
302 ErrorExit:
303 ACPI_EXCEPTION ((AE_INFO, Status, "During device initialization"));
304 return_ACPI_STATUS (Status);
305 }
306
307
308 /*******************************************************************************
309 *
310 * FUNCTION: AcpiNsInitOneObject
311 *
312 * PARAMETERS: ObjHandle - Node
313 * Level - Current nesting level
314 * Context - Points to a init info struct
315 * ReturnValue - Not used
316 *
317 * RETURN: Status
318 *
319 * DESCRIPTION: Callback from AcpiWalkNamespace. Invoked for every object
320 * within the namespace.
321 *
322 * Currently, the only objects that require initialization are:
323 * 1) Methods
324 * 2) Op Regions
325 *
326 ******************************************************************************/
327
328 static ACPI_STATUS
AcpiNsInitOneObject(ACPI_HANDLE ObjHandle,UINT32 Level,void * Context,void ** ReturnValue)329 AcpiNsInitOneObject (
330 ACPI_HANDLE ObjHandle,
331 UINT32 Level,
332 void *Context,
333 void **ReturnValue)
334 {
335 ACPI_OBJECT_TYPE Type;
336 ACPI_STATUS Status = AE_OK;
337 ACPI_INIT_WALK_INFO *Info = (ACPI_INIT_WALK_INFO *) Context;
338 ACPI_NAMESPACE_NODE *Node = (ACPI_NAMESPACE_NODE *) ObjHandle;
339 ACPI_OPERAND_OBJECT *ObjDesc;
340
341
342 ACPI_FUNCTION_NAME (NsInitOneObject);
343
344
345 Info->ObjectCount++;
346
347 /* And even then, we are only interested in a few object types */
348
349 Type = AcpiNsGetType (ObjHandle);
350 ObjDesc = AcpiNsGetAttachedObject (Node);
351 if (!ObjDesc)
352 {
353 return (AE_OK);
354 }
355
356 /* Increment counters for object types we are looking for */
357
358 switch (Type)
359 {
360 case ACPI_TYPE_REGION:
361 Info->OpRegionCount++;
362 break;
363
364 case ACPI_TYPE_BUFFER_FIELD:
365 Info->FieldCount++;
366 break;
367
368 case ACPI_TYPE_LOCAL_BANK_FIELD:
369 Info->FieldCount++;
370 break;
371
372 case ACPI_TYPE_BUFFER:
373 Info->BufferCount++;
374 break;
375
376 case ACPI_TYPE_PACKAGE:
377 Info->PackageCount++;
378 break;
379
380 default:
381
382 /* No init required, just exit now */
383 return (AE_OK);
384 }
385
386 /* If the object is already initialized, nothing else to do */
387
388 if (ObjDesc->Common.Flags & AOPOBJ_DATA_VALID)
389 {
390 return (AE_OK);
391 }
392
393 /* Must lock the interpreter before executing AML code */
394
395 AcpiExEnterInterpreter ();
396
397 /*
398 * Each of these types can contain executable AML code within the
399 * declaration.
400 */
401 switch (Type)
402 {
403 case ACPI_TYPE_REGION:
404
405 Info->OpRegionInit++;
406 Status = AcpiDsGetRegionArguments (ObjDesc);
407 break;
408
409 case ACPI_TYPE_BUFFER_FIELD:
410
411 Info->FieldInit++;
412 Status = AcpiDsGetBufferFieldArguments (ObjDesc);
413 break;
414
415 case ACPI_TYPE_LOCAL_BANK_FIELD:
416
417 Info->FieldInit++;
418 Status = AcpiDsGetBankFieldArguments (ObjDesc);
419 break;
420
421 case ACPI_TYPE_BUFFER:
422
423 Info->BufferInit++;
424 Status = AcpiDsGetBufferArguments (ObjDesc);
425 break;
426
427 case ACPI_TYPE_PACKAGE:
428
429 Info->PackageInit++;
430 Status = AcpiDsGetPackageArguments (ObjDesc);
431 break;
432
433 default:
434 /* No other types can get here */
435 break;
436 }
437
438 if (ACPI_FAILURE (Status))
439 {
440 ACPI_EXCEPTION ((AE_INFO, Status,
441 "Could not execute arguments for [%4.4s] (%s)",
442 AcpiUtGetNodeName (Node), AcpiUtGetTypeName (Type)));
443 }
444
445 /*
446 * Print a dot for each object unless we are going to print the entire
447 * pathname
448 */
449 if (!(AcpiDbgLevel & ACPI_LV_INIT_NAMES))
450 {
451 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT, "."));
452 }
453
454 /*
455 * We ignore errors from above, and always return OK, since we don't want
456 * to abort the walk on any single error.
457 */
458 AcpiExExitInterpreter ();
459 return (AE_OK);
460 }
461
462
463 /*******************************************************************************
464 *
465 * FUNCTION: AcpiNsFindIniMethods
466 *
467 * PARAMETERS: ACPI_WALK_CALLBACK
468 *
469 * RETURN: ACPI_STATUS
470 *
471 * DESCRIPTION: Called during namespace walk. Finds objects named _INI under
472 * device/processor/thermal objects, and marks the entire subtree
473 * with a SUBTREE_HAS_INI flag. This flag is used during the
474 * subsequent device initialization walk to avoid entire subtrees
475 * that do not contain an _INI.
476 *
477 ******************************************************************************/
478
479 static ACPI_STATUS
AcpiNsFindIniMethods(ACPI_HANDLE ObjHandle,UINT32 NestingLevel,void * Context,void ** ReturnValue)480 AcpiNsFindIniMethods (
481 ACPI_HANDLE ObjHandle,
482 UINT32 NestingLevel,
483 void *Context,
484 void **ReturnValue)
485 {
486 ACPI_DEVICE_WALK_INFO *Info = ACPI_CAST_PTR (ACPI_DEVICE_WALK_INFO, Context);
487 ACPI_NAMESPACE_NODE *Node;
488 ACPI_NAMESPACE_NODE *ParentNode;
489
490
491 /* Keep count of device/processor/thermal objects */
492
493 Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, ObjHandle);
494 if ((Node->Type == ACPI_TYPE_DEVICE) ||
495 (Node->Type == ACPI_TYPE_PROCESSOR) ||
496 (Node->Type == ACPI_TYPE_THERMAL))
497 {
498 Info->DeviceCount++;
499 return (AE_OK);
500 }
501
502 /* We are only looking for methods named _INI */
503
504 if (!ACPI_COMPARE_NAME (Node->Name.Ascii, METHOD_NAME__INI))
505 {
506 return (AE_OK);
507 }
508
509 /*
510 * The only _INI methods that we care about are those that are
511 * present under Device, Processor, and Thermal objects.
512 */
513 ParentNode = AcpiNsGetParentNode (Node);
514 switch (ParentNode->Type)
515 {
516 case ACPI_TYPE_DEVICE:
517 case ACPI_TYPE_PROCESSOR:
518 case ACPI_TYPE_THERMAL:
519
520 /* Mark parent and bubble up the INI present flag to the root */
521
522 while (ParentNode)
523 {
524 ParentNode->Flags |= ANOBJ_SUBTREE_HAS_INI;
525 ParentNode = AcpiNsGetParentNode (ParentNode);
526 }
527 break;
528
529 default:
530 break;
531 }
532
533 return (AE_OK);
534 }
535
536
537 /*******************************************************************************
538 *
539 * FUNCTION: AcpiNsInitOneDevice
540 *
541 * PARAMETERS: ACPI_WALK_CALLBACK
542 *
543 * RETURN: ACPI_STATUS
544 *
545 * DESCRIPTION: This is called once per device soon after ACPI is enabled
546 * to initialize each device. It determines if the device is
547 * present, and if so, calls _INI.
548 *
549 ******************************************************************************/
550
551 static ACPI_STATUS
AcpiNsInitOneDevice(ACPI_HANDLE ObjHandle,UINT32 NestingLevel,void * Context,void ** ReturnValue)552 AcpiNsInitOneDevice (
553 ACPI_HANDLE ObjHandle,
554 UINT32 NestingLevel,
555 void *Context,
556 void **ReturnValue)
557 {
558 ACPI_DEVICE_WALK_INFO *WalkInfo = ACPI_CAST_PTR (ACPI_DEVICE_WALK_INFO, Context);
559 ACPI_EVALUATE_INFO *Info = WalkInfo->EvaluateInfo;
560 UINT32 Flags;
561 ACPI_STATUS Status;
562 ACPI_NAMESPACE_NODE *DeviceNode;
563
564
565 ACPI_FUNCTION_TRACE (NsInitOneDevice);
566
567
568 /* We are interested in Devices, Processors and ThermalZones only */
569
570 DeviceNode = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, ObjHandle);
571 if ((DeviceNode->Type != ACPI_TYPE_DEVICE) &&
572 (DeviceNode->Type != ACPI_TYPE_PROCESSOR) &&
573 (DeviceNode->Type != ACPI_TYPE_THERMAL))
574 {
575 return_ACPI_STATUS (AE_OK);
576 }
577
578 /*
579 * Because of an earlier namespace analysis, all subtrees that contain an
580 * _INI method are tagged.
581 *
582 * If this device subtree does not contain any _INI methods, we
583 * can exit now and stop traversing this entire subtree.
584 */
585 if (!(DeviceNode->Flags & ANOBJ_SUBTREE_HAS_INI))
586 {
587 return_ACPI_STATUS (AE_CTRL_DEPTH);
588 }
589
590 /*
591 * Run _STA to determine if this device is present and functioning. We
592 * must know this information for two important reasons (from ACPI spec):
593 *
594 * 1) We can only run _INI if the device is present.
595 * 2) We must abort the device tree walk on this subtree if the device is
596 * not present and is not functional (we will not examine the children)
597 *
598 * The _STA method is not required to be present under the device, we
599 * assume the device is present if _STA does not exist.
600 */
601 ACPI_DEBUG_EXEC (AcpiUtDisplayInitPathname (
602 ACPI_TYPE_METHOD, DeviceNode, METHOD_NAME__STA));
603
604 Status = AcpiUtExecute_STA (DeviceNode, &Flags);
605 if (ACPI_FAILURE (Status))
606 {
607 /* Ignore error and move on to next device */
608
609 return_ACPI_STATUS (AE_OK);
610 }
611
612 /*
613 * Flags == -1 means that _STA was not found. In this case, we assume that
614 * the device is both present and functional.
615 *
616 * From the ACPI spec, description of _STA:
617 *
618 * "If a device object (including the processor object) does not have an
619 * _STA object, then OSPM assumes that all of the above bits are set (in
620 * other words, the device is present, ..., and functioning)"
621 */
622 if (Flags != ACPI_UINT32_MAX)
623 {
624 WalkInfo->Num_STA++;
625 }
626
627 /*
628 * Examine the PRESENT and FUNCTIONING status bits
629 *
630 * Note: ACPI spec does not seem to specify behavior for the present but
631 * not functioning case, so we assume functioning if present.
632 */
633 if (!(Flags & ACPI_STA_DEVICE_PRESENT))
634 {
635 /* Device is not present, we must examine the Functioning bit */
636
637 if (Flags & ACPI_STA_DEVICE_FUNCTIONING)
638 {
639 /*
640 * Device is not present but is "functioning". In this case,
641 * we will not run _INI, but we continue to examine the children
642 * of this device.
643 *
644 * From the ACPI spec, description of _STA: (Note - no mention
645 * of whether to run _INI or not on the device in question)
646 *
647 * "_STA may return bit 0 clear (not present) with bit 3 set
648 * (device is functional). This case is used to indicate a valid
649 * device for which no device driver should be loaded (for example,
650 * a bridge device.) Children of this device may be present and
651 * valid. OSPM should continue enumeration below a device whose
652 * _STA returns this bit combination"
653 */
654 return_ACPI_STATUS (AE_OK);
655 }
656 else
657 {
658 /*
659 * Device is not present and is not functioning. We must abort the
660 * walk of this subtree immediately -- don't look at the children
661 * of such a device.
662 *
663 * From the ACPI spec, description of _INI:
664 *
665 * "If the _STA method indicates that the device is not present,
666 * OSPM will not run the _INI and will not examine the children
667 * of the device for _INI methods"
668 */
669 return_ACPI_STATUS (AE_CTRL_DEPTH);
670 }
671 }
672
673 /*
674 * The device is present or is assumed present if no _STA exists.
675 * Run the _INI if it exists (not required to exist)
676 *
677 * Note: We know there is an _INI within this subtree, but it may not be
678 * under this particular device, it may be lower in the branch.
679 */
680 ACPI_DEBUG_EXEC (AcpiUtDisplayInitPathname (
681 ACPI_TYPE_METHOD, DeviceNode, METHOD_NAME__INI));
682
683 Info->PrefixNode = DeviceNode;
684 Info->Pathname = METHOD_NAME__INI;
685 Info->Parameters = NULL;
686 Info->Flags = ACPI_IGNORE_RETURN_VALUE;
687
688 Status = AcpiNsEvaluate (Info);
689 if (ACPI_SUCCESS (Status))
690 {
691 WalkInfo->Num_INI++;
692
693 if ((AcpiDbgLevel <= ACPI_LV_ALL_EXCEPTIONS) &&
694 (!(AcpiDbgLevel & ACPI_LV_INFO)))
695 {
696 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INIT, "."));
697 }
698 }
699
700 #ifdef ACPI_DEBUG_OUTPUT
701 else if (Status != AE_NOT_FOUND)
702 {
703 /* Ignore error and move on to next device */
704
705 char *ScopeName = AcpiNsGetExternalPathname (Info->ResolvedNode);
706
707 ACPI_EXCEPTION ((AE_INFO, Status, "during %s._INI execution",
708 ScopeName));
709 ACPI_FREE (ScopeName);
710 }
711 #endif
712
713 /* Ignore errors from above */
714
715 Status = AE_OK;
716
717 /*
718 * The _INI method has been run if present; call the Global Initialization
719 * Handler for this device.
720 */
721 if (AcpiGbl_InitHandler)
722 {
723 Status = AcpiGbl_InitHandler (DeviceNode, ACPI_INIT_DEVICE_INI);
724 }
725
726 return_ACPI_STATUS (Status);
727 }
728