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1 | /*++ | |
2 | ||
3 | Copyright (c) 2006, Intel Corporation | |
4 | All rights reserved. This program and the accompanying materials | |
5 | are licensed and made available under the terms and conditions of the BSD License | |
6 | which accompanies this distribution. The full text of the license may be found at | |
7 | http://opensource.org/licenses/bsd-license.php | |
8 | ||
9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
11 | ||
12 | Module Name: | |
13 | ||
14 | event.c | |
15 | ||
16 | Abstract: | |
17 | ||
18 | EFI Event support | |
19 | ||
20 | --*/ | |
21 | ||
22 | ||
23 | #include <DxeMain.h> | |
24 | ||
25 | // | |
26 | // Enumerate the valid types | |
27 | // | |
28 | UINT32 mEventTable[] = { | |
29 | // | |
30 | // 0x80000200 Timer event with a notification function that is | |
31 | // queue when the event is signaled with SignalEvent() | |
32 | // | |
33 | EFI_EVENT_TIMER | EFI_EVENT_NOTIFY_SIGNAL, | |
34 | // | |
35 | // 0x80000000 Timer event without a notification function. It can be | |
36 | // signaled with SignalEvent() and checked with CheckEvent() or WaitForEvent(). | |
37 | // | |
38 | EFI_EVENT_TIMER, | |
39 | // | |
40 | // 0x00000100 Generic event with a notification function that | |
41 | // can be waited on with CheckEvent() or WaitForEvent() | |
42 | // | |
43 | EFI_EVENT_NOTIFY_WAIT, | |
44 | // | |
45 | // 0x00000200 Generic event with a notification function that | |
46 | // is queue when the event is signaled with SignalEvent() | |
47 | // | |
48 | EFI_EVENT_NOTIFY_SIGNAL, | |
49 | // | |
50 | // 0x00000201 ExitBootServicesEvent. | |
51 | // | |
52 | EFI_EVENT_SIGNAL_EXIT_BOOT_SERVICES, | |
53 | // | |
54 | // 0x60000202 SetVirtualAddressMapEvent. | |
55 | // | |
56 | EFI_EVENT_SIGNAL_VIRTUAL_ADDRESS_CHANGE, | |
57 | ||
58 | #if (EFI_SPECIFICATION_VERSION < 0x00020000) | |
59 | // | |
60 | // 0x00000203 ReadyToBootEvent. | |
61 | // | |
62 | EFI_EVENT_SIGNAL_READY_TO_BOOT, | |
63 | // | |
64 | // 0x00000204 LegacyBootEvent. | |
65 | // | |
66 | EFI_EVENT_SIGNAL_LEGACY_BOOT, | |
67 | // | |
68 | // 0x00000603 Signal all ReadyToBootEvents. | |
69 | // | |
70 | EFI_EVENT_NOTIFY_SIGNAL_ALL | EFI_EVENT_SIGNAL_READY_TO_BOOT, | |
71 | // | |
72 | // 0x00000604 Signal all LegacyBootEvents. | |
73 | // | |
74 | EFI_EVENT_NOTIFY_SIGNAL_ALL | EFI_EVENT_SIGNAL_LEGACY_BOOT, | |
75 | #endif | |
76 | ||
77 | // | |
78 | // 0x00000000 Generic event without a notification function. | |
79 | // It can be signaled with SignalEvent() and checked with CheckEvent() | |
80 | // or WaitForEvent(). | |
81 | // | |
82 | 0x00000000, | |
83 | // | |
84 | // 0x80000100 Timer event with a notification function that can be | |
85 | // waited on with CheckEvent() or WaitForEvent() | |
86 | // | |
87 | EFI_EVENT_TIMER | EFI_EVENT_NOTIFY_WAIT, | |
88 | }; | |
89 | ||
90 | ||
91 | VOID | |
92 | CoreAcquireEventLock ( | |
93 | VOID | |
94 | ) | |
95 | /*++ | |
96 | ||
97 | Routine Description: | |
98 | ||
99 | Enter critical section by acquiring the lock on gEventQueueLock. | |
100 | ||
101 | Arguments: | |
102 | ||
103 | None | |
104 | ||
105 | Returns: | |
106 | ||
107 | None | |
108 | ||
109 | --*/ | |
110 | { | |
111 | CoreAcquireLock (&gEventQueueLock); | |
112 | } | |
113 | ||
114 | ||
115 | VOID | |
116 | CoreReleaseEventLock ( | |
117 | VOID | |
118 | ) | |
119 | /*++ | |
120 | ||
121 | Routine Description: | |
122 | ||
123 | Exit critical section by releasing the lock on gEventQueueLock. | |
124 | ||
125 | Arguments: | |
126 | ||
127 | None | |
128 | ||
129 | Returns: | |
130 | ||
131 | None | |
132 | ||
133 | --*/ | |
134 | { | |
135 | CoreReleaseLock (&gEventQueueLock); | |
136 | } | |
137 | ||
138 | ||
139 | EFI_STATUS | |
140 | CoreInitializeEventServices ( | |
141 | VOID | |
142 | ) | |
143 | /*++ | |
144 | ||
145 | Routine Description: | |
146 | ||
147 | Initializes "event" support and populates parts of the System and Runtime Table. | |
148 | ||
149 | Arguments: | |
150 | ||
151 | None | |
152 | ||
153 | Returns: | |
154 | ||
155 | EFI_SUCCESS - Always return success | |
156 | ||
157 | --*/ | |
158 | { | |
159 | UINTN Index; | |
160 | ||
161 | for (Index=0; Index <= EFI_TPL_HIGH_LEVEL; Index++) { | |
162 | InitializeListHead (&gEventQueue[Index]); | |
163 | } | |
164 | ||
165 | CoreInitializeTimer (); | |
166 | ||
167 | return EFI_SUCCESS; | |
168 | } | |
169 | ||
170 | ||
171 | EFI_STATUS | |
172 | CoreShutdownEventServices ( | |
173 | VOID | |
174 | ) | |
175 | /*++ | |
176 | ||
177 | Routine Description: | |
178 | ||
179 | Register all runtime events to make sure they are still available after ExitBootService. | |
180 | ||
181 | Arguments: | |
182 | ||
183 | None | |
184 | ||
185 | Returns: | |
186 | ||
187 | EFI_SUCCESS - Always return success. | |
188 | ||
189 | --*/ | |
190 | { | |
191 | LIST_ENTRY *Link; | |
192 | IEVENT *Event; | |
193 | ||
194 | // | |
195 | // The Runtime AP is required for the core to function! | |
196 | // | |
197 | ASSERT (gRuntime != NULL); | |
198 | ||
199 | for (Link = mRuntimeEventList.ForwardLink; Link != &mRuntimeEventList; Link = Link->ForwardLink) { | |
200 | Event = CR (Link, IEVENT, RuntimeLink, EVENT_SIGNATURE); | |
201 | gRuntime->RegisterEvent ( | |
202 | gRuntime, | |
203 | Event->Type, | |
204 | Event->NotifyTpl, | |
205 | Event->NotifyFunction, | |
206 | Event->NotifyContext, | |
207 | (VOID **)Event | |
208 | ); | |
209 | } | |
210 | ||
211 | return EFI_SUCCESS; | |
212 | } | |
213 | ||
214 | ||
215 | VOID | |
216 | CoreDispatchEventNotifies ( | |
217 | IN EFI_TPL Priority | |
218 | ) | |
219 | /*++ | |
220 | ||
221 | Routine Description: | |
222 | ||
223 | Dispatches all pending events. | |
224 | ||
225 | Arguments: | |
226 | ||
227 | Priority - The task priority level of event notifications to dispatch | |
228 | ||
229 | Returns: | |
230 | ||
231 | None | |
232 | ||
233 | --*/ | |
234 | { | |
235 | IEVENT *Event; | |
236 | LIST_ENTRY *Head; | |
237 | ||
238 | CoreAcquireEventLock (); | |
239 | ASSERT (gEventQueueLock.OwnerTpl == Priority); | |
240 | Head = &gEventQueue[Priority]; | |
241 | ||
242 | // | |
243 | // Dispatch all the pending notifications | |
244 | // | |
245 | while (!IsListEmpty (Head)) { | |
246 | ||
247 | Event = CR (Head->ForwardLink, IEVENT, NotifyLink, EVENT_SIGNATURE); | |
248 | RemoveEntryList (&Event->NotifyLink); | |
249 | ||
250 | Event->NotifyLink.ForwardLink = NULL; | |
251 | ||
252 | // | |
253 | // Only clear the SIGNAL status if it is a SIGNAL type event. | |
254 | // WAIT type events are only cleared in CheckEvent() | |
255 | // | |
256 | if (Event->Type & EFI_EVENT_NOTIFY_SIGNAL) { | |
257 | Event->SignalCount = 0; | |
258 | } | |
259 | ||
260 | CoreReleaseEventLock (); | |
261 | ||
262 | // | |
263 | // Notify this event | |
264 | // | |
265 | ASSERT (Event->NotifyFunction != NULL); | |
266 | Event->NotifyFunction (Event, Event->NotifyContext); | |
267 | ||
268 | // | |
269 | // Check for next pending event | |
270 | // | |
271 | CoreAcquireEventLock (); | |
272 | } | |
273 | ||
274 | gEventPending &= ~(1 << Priority); | |
275 | CoreReleaseEventLock (); | |
276 | } | |
277 | ||
278 | ||
279 | VOID | |
280 | STATIC | |
281 | CoreNotifyEvent ( | |
282 | IN IEVENT *Event | |
283 | ) | |
284 | /*++ | |
285 | ||
286 | Routine Description: | |
287 | ||
288 | Queues the event's notification function to fire | |
289 | ||
290 | Arguments: | |
291 | ||
292 | Event - The Event to notify | |
293 | ||
294 | Returns: | |
295 | ||
296 | None | |
297 | ||
298 | --*/ | |
299 | { | |
300 | ||
301 | // | |
302 | // Event database must be locked | |
303 | // | |
304 | ASSERT_LOCKED (&gEventQueueLock); | |
305 | ||
306 | // | |
307 | // If the event is queued somewhere, remove it | |
308 | // | |
309 | ||
310 | if (Event->NotifyLink.ForwardLink != NULL) { | |
311 | RemoveEntryList (&Event->NotifyLink); | |
312 | Event->NotifyLink.ForwardLink = NULL; | |
313 | } | |
314 | ||
315 | // | |
316 | // Queue the event to the pending notification list | |
317 | // | |
318 | ||
319 | InsertTailList (&gEventQueue[Event->NotifyTpl], &Event->NotifyLink); | |
320 | gEventPending |= (UINTN)(1 << Event->NotifyTpl); | |
321 | } | |
322 | ||
323 | ||
324 | ||
325 | VOID | |
326 | CoreNotifySignalList ( | |
327 | IN EFI_GUID *EventGroup | |
328 | ) | |
329 | /*++ | |
330 | ||
331 | Routine Description: | |
332 | Signals all events in the EventGroup | |
333 | ||
334 | Arguments: | |
335 | EventGroup - The list to signal | |
336 | ||
337 | Returns: | |
338 | ||
339 | None | |
340 | ||
341 | --*/ | |
342 | { | |
343 | LIST_ENTRY *Link; | |
344 | LIST_ENTRY *Head; | |
345 | IEVENT *Event; | |
346 | ||
347 | CoreAcquireEventLock (); | |
348 | ||
349 | Head = &gEventSignalQueue; | |
350 | for (Link = Head->ForwardLink; Link != Head; Link = Link->ForwardLink) { | |
351 | Event = CR (Link, IEVENT, SignalLink, EVENT_SIGNATURE); | |
352 | if (CompareGuid (&Event->EventGroup, EventGroup)) { | |
353 | CoreNotifyEvent (Event); | |
354 | } | |
355 | } | |
356 | ||
357 | CoreReleaseEventLock (); | |
358 | } | |
359 | ||
360 | ||
361 | #if (EFI_SPECIFICATION_VERSION < 0x00020000) | |
362 | ||
363 | static | |
364 | VOID | |
365 | EFIAPI | |
366 | EventNofitySignalAllNullEvent ( | |
367 | IN EFI_EVENT Event, | |
368 | IN VOID *Context | |
369 | ) | |
370 | { | |
371 | // | |
372 | // This null event is a size efficent way to enusre that | |
373 | // EFI_EVENT_NOTIFY_SIGNAL_ALL is error checked correctly. | |
374 | // EFI_EVENT_NOTIFY_SIGNAL_ALL is now mapped into | |
375 | // CreateEventEx() and this function is used to make the | |
376 | // old error checking in CreateEvent() for Tiano extensions | |
377 | // function. | |
378 | // | |
379 | return; | |
380 | } | |
381 | ||
382 | #endif | |
383 | ||
384 | ||
385 | ||
386 | ||
387 | EFI_STATUS | |
388 | EFIAPI | |
389 | CoreCreateEvent ( | |
390 | IN UINT32 Type, | |
391 | IN EFI_TPL NotifyTpl, | |
392 | IN EFI_EVENT_NOTIFY NotifyFunction, OPTIONAL | |
393 | IN VOID *NotifyContext, OPTIONAL | |
394 | OUT EFI_EVENT *Event | |
395 | ) | |
396 | /*++ | |
397 | ||
398 | Routine Description: | |
399 | Creates a general-purpose event structure | |
400 | ||
401 | Arguments: | |
402 | Type - The type of event to create and its mode and attributes | |
403 | NotifyTpl - The task priority level of event notifications | |
404 | NotifyFunction - Pointer to the events notification function | |
405 | NotifyContext - Pointer to the notification functions context; corresponds to | |
406 | parameter "Context" in the notification function | |
407 | Event - Pointer to the newly created event if the call succeeds; undefined otherwise | |
408 | ||
409 | Returns: | |
410 | EFI_SUCCESS - The event structure was created | |
411 | EFI_INVALID_PARAMETER - One of the parameters has an invalid value | |
412 | EFI_OUT_OF_RESOURCES - The event could not be allocated | |
413 | ||
414 | --*/ | |
415 | { | |
416 | EFI_GUID *GuidPtr; | |
417 | EFI_EVENT_NOTIFY Function; | |
418 | ||
419 | GuidPtr = NULL; | |
420 | Function = NotifyFunction; | |
421 | ||
422 | #if (EFI_SPECIFICATION_VERSION < 0x00020000) | |
423 | // | |
424 | // Clear EFI_EVENT_NOFITY_SIGNAL_ALL (Tiano extension) as all events in the | |
425 | // EventGroup now have this property. So we need to filter it out. | |
426 | // | |
427 | if (Type & EFI_EVENT_NOTIFY_SIGNAL_ALL) { | |
428 | Type &= ~EFI_EVENT_NOTIFY_SIGNAL_ALL; | |
429 | Function = EventNofitySignalAllNullEvent; | |
430 | } | |
431 | ||
432 | // | |
433 | // Map the Tiano extensions Events to CreateEventEx form | |
434 | // | |
435 | if (Type == EFI_EVENT_SIGNAL_READY_TO_BOOT) { | |
436 | GuidPtr = &gEfiEventReadyToBootGuid; | |
437 | } else if (Type == EFI_EVENT_SIGNAL_LEGACY_BOOT) { | |
438 | GuidPtr = &gEfiEventLegacyBootGuid | |
439 | } | |
440 | #endif | |
441 | ||
442 | // | |
443 | // Convert EFI 1.10 Events to thier UEFI 2.0 CreateEventEx mapping | |
444 | // | |
445 | if (Type == EVENT_SIGNAL_EXIT_BOOT_SERVICES) { | |
446 | GuidPtr = &gEfiEventExitBootServicesGuid; | |
447 | } else if (Type == EVENT_SIGNAL_VIRTUAL_ADDRESS_CHANGE) { | |
448 | GuidPtr = &gEfiEventVirtualAddressChangeGuid; | |
449 | } | |
450 | ||
451 | return CoreCreateEventEx (Type, NotifyTpl, Function, NotifyContext, GuidPtr, Event); | |
452 | } | |
453 | ||
454 | ||
455 | EFI_STATUS | |
456 | EFIAPI | |
457 | CoreCreateEventEx ( | |
458 | IN UINT32 Type, | |
459 | IN EFI_TPL NotifyTpl, | |
460 | IN EFI_EVENT_NOTIFY NotifyFunction, OPTIONAL | |
461 | IN CONST VOID *NotifyContext, OPTIONAL | |
462 | IN CONST EFI_GUID *EventGroup, OPTIONAL | |
463 | OUT EFI_EVENT *Event | |
464 | ) | |
465 | /*++ | |
466 | ||
467 | Routine Description: | |
468 | Creates a general-purpose event structure | |
469 | ||
470 | Arguments: | |
471 | Type - The type of event to create and its mode and attributes | |
472 | NotifyTpl - The task priority level of event notifications | |
473 | NotifyFunction - Pointer to the events notification function | |
474 | NotifyContext - Pointer to the notification functions context; corresponds to | |
475 | parameter "Context" in the notification function | |
476 | EventGrout - GUID for EventGroup if NULL act the same as gBS->CreateEvent(). | |
477 | Event - Pointer to the newly created event if the call succeeds; undefined otherwise | |
478 | ||
479 | Returns: | |
480 | EFI_SUCCESS - The event structure was created | |
481 | EFI_INVALID_PARAMETER - One of the parameters has an invalid value | |
482 | EFI_OUT_OF_RESOURCES - The event could not be allocated | |
483 | ||
484 | --*/ | |
485 | { | |
486 | EFI_STATUS Status; | |
487 | IEVENT *IEvent; | |
488 | INTN Index; | |
489 | ||
490 | ||
491 | if ((Event == NULL) || (NotifyTpl == EFI_TPL_APPLICATION)) { | |
492 | return EFI_INVALID_PARAMETER; | |
493 | } | |
494 | ||
495 | // | |
496 | // Check to make sure no reserved flags are set | |
497 | // | |
498 | Status = EFI_INVALID_PARAMETER; | |
499 | for (Index = 0; Index < (sizeof (mEventTable) / sizeof (UINT32)); Index++) { | |
500 | if (Type == mEventTable[Index]) { | |
501 | Status = EFI_SUCCESS; | |
502 | break; | |
503 | } | |
504 | } | |
505 | if(EFI_ERROR (Status)) { | |
506 | return EFI_INVALID_PARAMETER; | |
507 | } | |
508 | ||
509 | // | |
510 | // If it's a notify type of event, check its parameters | |
511 | // | |
512 | if ((Type & (EFI_EVENT_NOTIFY_WAIT | EFI_EVENT_NOTIFY_SIGNAL))) { | |
513 | // | |
514 | // Check for an invalid NotifyFunction or NotifyTpl | |
515 | // | |
516 | if ((NotifyFunction == NULL) || | |
517 | (NotifyTpl < EFI_TPL_APPLICATION) || | |
518 | (NotifyTpl >= EFI_TPL_HIGH_LEVEL)) { | |
519 | return EFI_INVALID_PARAMETER; | |
520 | } | |
521 | ||
522 | } else { | |
523 | // | |
524 | // No notification needed, zero ignored values | |
525 | // | |
526 | NotifyTpl = 0; | |
527 | NotifyFunction = NULL; | |
528 | NotifyContext = NULL; | |
529 | } | |
530 | ||
531 | // | |
532 | // Allcoate and initialize a new event structure. | |
533 | // | |
534 | Status = CoreAllocatePool ( | |
535 | (Type & EFI_EVENT_RUNTIME) ? EfiRuntimeServicesData: EfiBootServicesData, | |
536 | sizeof (IEVENT), | |
537 | (VOID **)&IEvent | |
538 | ); | |
539 | if (EFI_ERROR (Status)) { | |
540 | return EFI_OUT_OF_RESOURCES; | |
541 | } | |
542 | ||
543 | SetMem (IEvent, sizeof (IEVENT), 0); | |
544 | ||
545 | IEvent->Signature = EVENT_SIGNATURE; | |
546 | IEvent->Type = Type; | |
547 | ||
548 | IEvent->NotifyTpl = NotifyTpl; | |
549 | IEvent->NotifyFunction = NotifyFunction; | |
550 | IEvent->NotifyContext = (VOID *)NotifyContext; | |
551 | if (EventGroup != NULL) { | |
552 | CopyGuid (&IEvent->EventGroup, EventGroup); | |
553 | IEvent->ExFlag = TRUE; | |
554 | } | |
555 | ||
556 | *Event = IEvent; | |
557 | ||
558 | if (Type & EFI_EVENT_RUNTIME) { | |
559 | // | |
560 | // Keep a list of all RT events so we can tell the RT AP. | |
561 | // | |
562 | InsertTailList (&mRuntimeEventList, &IEvent->RuntimeLink); | |
563 | } | |
564 | ||
565 | CoreAcquireEventLock (); | |
566 | ||
567 | if ((Type & EFI_EVENT_NOTIFY_SIGNAL) != 0x00000000) { | |
568 | // | |
569 | // The Event's NotifyFunction must be queued whenever the event is signaled | |
570 | // | |
571 | InsertHeadList (&gEventSignalQueue, &IEvent->SignalLink); | |
572 | } | |
573 | ||
574 | CoreReleaseEventLock (); | |
575 | ||
576 | // | |
577 | // Done | |
578 | // | |
579 | return EFI_SUCCESS; | |
580 | } | |
581 | ||
582 | ||
583 | ||
584 | EFI_STATUS | |
585 | EFIAPI | |
586 | CoreSignalEvent ( | |
587 | IN EFI_EVENT UserEvent | |
588 | ) | |
589 | /*++ | |
590 | ||
591 | Routine Description: | |
592 | ||
593 | Signals the event. Queues the event to be notified if needed | |
594 | ||
595 | Arguments: | |
596 | ||
597 | UserEvent - The event to signal | |
598 | ||
599 | Returns: | |
600 | ||
601 | EFI_INVALID_PARAMETER - Parameters are not valid. | |
602 | ||
603 | EFI_SUCCESS - The event was signaled. | |
604 | ||
605 | --*/ | |
606 | { | |
607 | IEVENT *Event; | |
608 | ||
609 | Event = UserEvent; | |
610 | ||
611 | if (Event == NULL) { | |
612 | return EFI_INVALID_PARAMETER; | |
613 | } | |
614 | ||
615 | if (Event->Signature != EVENT_SIGNATURE) { | |
616 | return EFI_INVALID_PARAMETER; | |
617 | } | |
618 | ||
619 | CoreAcquireEventLock (); | |
620 | ||
621 | // | |
622 | // If the event is not already signalled, do so | |
623 | // | |
624 | ||
625 | if (Event->SignalCount == 0x00000000) { | |
626 | Event->SignalCount++; | |
627 | ||
628 | // | |
629 | // If signalling type is a notify function, queue it | |
630 | // | |
631 | if (Event->Type & EFI_EVENT_NOTIFY_SIGNAL) { | |
632 | if (Event->ExFlag) { | |
633 | // | |
634 | // The CreateEventEx() style requires all members of the Event Group | |
635 | // to be signaled. | |
636 | // | |
637 | CoreReleaseEventLock (); | |
638 | CoreNotifySignalList (&Event->EventGroup); | |
639 | CoreAcquireEventLock (); | |
640 | } else { | |
641 | CoreNotifyEvent (Event); | |
642 | } | |
643 | } | |
644 | } | |
645 | ||
646 | CoreReleaseEventLock (); | |
647 | return EFI_SUCCESS; | |
648 | } | |
649 | ||
650 | ||
651 | EFI_STATUS | |
652 | EFIAPI | |
653 | CoreCheckEvent ( | |
654 | IN EFI_EVENT UserEvent | |
655 | ) | |
656 | /*++ | |
657 | ||
658 | Routine Description: | |
659 | ||
660 | Check the status of an event | |
661 | ||
662 | Arguments: | |
663 | ||
664 | UserEvent - The event to check | |
665 | ||
666 | Returns: | |
667 | ||
668 | EFI_SUCCESS - The event is in the signaled state | |
669 | EFI_NOT_READY - The event is not in the signaled state | |
670 | EFI_INVALID_PARAMETER - Event is of type EVT_NOTIFY_SIGNAL | |
671 | ||
672 | --*/ | |
673 | ||
674 | { | |
675 | IEVENT *Event; | |
676 | EFI_STATUS Status; | |
677 | ||
678 | Event = UserEvent; | |
679 | ||
680 | if (Event == NULL) { | |
681 | return EFI_INVALID_PARAMETER; | |
682 | } | |
683 | ||
684 | if (Event->Signature != EVENT_SIGNATURE) { | |
685 | return EFI_INVALID_PARAMETER; | |
686 | } | |
687 | ||
688 | if (Event->Type & EFI_EVENT_NOTIFY_SIGNAL) { | |
689 | return EFI_INVALID_PARAMETER; | |
690 | } | |
691 | ||
692 | Status = EFI_NOT_READY; | |
693 | ||
694 | if (!Event->SignalCount && (Event->Type & EFI_EVENT_NOTIFY_WAIT)) { | |
695 | ||
696 | // | |
697 | // Queue the wait notify function | |
698 | // | |
699 | ||
700 | CoreAcquireEventLock (); | |
701 | if (!Event->SignalCount) { | |
702 | CoreNotifyEvent (Event); | |
703 | } | |
704 | CoreReleaseEventLock (); | |
705 | } | |
706 | ||
707 | // | |
708 | // If the even looks signalled, get the lock and clear it | |
709 | // | |
710 | ||
711 | if (Event->SignalCount) { | |
712 | CoreAcquireEventLock (); | |
713 | ||
714 | if (Event->SignalCount) { | |
715 | Event->SignalCount = 0; | |
716 | Status = EFI_SUCCESS; | |
717 | } | |
718 | ||
719 | CoreReleaseEventLock (); | |
720 | } | |
721 | ||
722 | return Status; | |
723 | } | |
724 | ||
725 | ||
726 | ||
727 | EFI_STATUS | |
728 | EFIAPI | |
729 | CoreWaitForEvent ( | |
730 | IN UINTN NumberOfEvents, | |
731 | IN EFI_EVENT *UserEvents, | |
732 | OUT UINTN *UserIndex | |
733 | ) | |
734 | /*++ | |
735 | ||
736 | Routine Description: | |
737 | ||
738 | Stops execution until an event is signaled. | |
739 | ||
740 | Arguments: | |
741 | ||
742 | NumberOfEvents - The number of events in the UserEvents array | |
743 | UserEvents - An array of EFI_EVENT | |
744 | UserIndex - Pointer to the index of the event which satisfied the wait condition | |
745 | ||
746 | Returns: | |
747 | ||
748 | EFI_SUCCESS - The event indicated by Index was signaled. | |
749 | EFI_INVALID_PARAMETER - The event indicated by Index has a notification function or | |
750 | Event was not a valid type | |
751 | EFI_UNSUPPORTED - The current TPL is not TPL_APPLICATION | |
752 | ||
753 | --*/ | |
754 | ||
755 | { | |
756 | EFI_STATUS Status; | |
757 | UINTN Index; | |
758 | ||
759 | // | |
760 | // Can only WaitForEvent at TPL_APPLICATION | |
761 | // | |
762 | if (gEfiCurrentTpl != EFI_TPL_APPLICATION) { | |
763 | return EFI_UNSUPPORTED; | |
764 | } | |
765 | ||
766 | for(;;) { | |
767 | ||
768 | for(Index = 0; Index < NumberOfEvents; Index++) { | |
769 | ||
770 | Status = CoreCheckEvent (UserEvents[Index]); | |
771 | ||
772 | // | |
773 | // provide index of event that caused problem | |
774 | // | |
775 | if (Status != EFI_NOT_READY) { | |
776 | *UserIndex = Index; | |
777 | return Status; | |
778 | } | |
779 | } | |
780 | ||
781 | // | |
782 | // This was the location of the Idle loop callback in EFI 1.x reference | |
783 | // code. We don't have that concept in this base at this point. | |
784 | // | |
785 | } | |
786 | } | |
787 | ||
788 | ||
789 | EFI_STATUS | |
790 | EFIAPI | |
791 | CoreCloseEvent ( | |
792 | IN EFI_EVENT UserEvent | |
793 | ) | |
794 | /*++ | |
795 | ||
796 | Routine Description: | |
797 | ||
798 | Closes an event and frees the event structure. | |
799 | ||
800 | Arguments: | |
801 | ||
802 | UserEvent - Event to close | |
803 | ||
804 | Returns: | |
805 | ||
806 | EFI_INVALID_PARAMETER - Parameters are not valid. | |
807 | ||
808 | EFI_SUCCESS - The event has been closed | |
809 | ||
810 | --*/ | |
811 | ||
812 | { | |
813 | EFI_STATUS Status; | |
814 | IEVENT *Event; | |
815 | ||
816 | Event = UserEvent; | |
817 | ||
818 | if (Event == NULL) { | |
819 | return EFI_INVALID_PARAMETER; | |
820 | } | |
821 | ||
822 | if (Event->Signature != EVENT_SIGNATURE) { | |
823 | return EFI_INVALID_PARAMETER; | |
824 | } | |
825 | ||
826 | // | |
827 | // If it's a timer event, make sure it's not pending | |
828 | // | |
829 | if (Event->Type & EFI_EVENT_TIMER) { | |
830 | CoreSetTimer (Event, TimerCancel, 0); | |
831 | } | |
832 | ||
833 | CoreAcquireEventLock (); | |
834 | ||
835 | // | |
836 | // If the event is queued somewhere, remove it | |
837 | // | |
838 | ||
839 | if (Event->RuntimeLink.ForwardLink != NULL) { | |
840 | RemoveEntryList (&Event->RuntimeLink); | |
841 | } | |
842 | ||
843 | if (Event->NotifyLink.ForwardLink != NULL) { | |
844 | RemoveEntryList (&Event->NotifyLink); | |
845 | } | |
846 | ||
847 | if (Event->SignalLink.ForwardLink != NULL) { | |
848 | RemoveEntryList (&Event->SignalLink); | |
849 | } | |
850 | ||
851 | CoreReleaseEventLock (); | |
852 | ||
853 | // | |
854 | // If the event is registered on a protocol notify, then remove it from the protocol database | |
855 | // | |
856 | CoreUnregisterProtocolNotify (Event); | |
857 | ||
858 | Status = CoreFreePool (Event); | |
859 | ASSERT_EFI_ERROR (Status); | |
860 | ||
861 | return Status; | |
862 | } |