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6ae81428 | 1 | /**@file\r |
e331c50d | 2 | \r |
3 | Copyright (c) 2006, Intel Corporation \r | |
4 | All rights reserved. This program and the accompanying materials \r | |
5 | are licensed and made available under the terms and conditions of the BSD License \r | |
6 | which accompanies this distribution. The full text of the license may be found at \r | |
7 | http://opensource.org/licenses/bsd-license.php \r | |
8 | \r | |
9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
11 | \r | |
12 | Module Name:\r | |
13 | \r | |
14 | Timer.c\r | |
15 | \r | |
16 | Abstract:\r | |
17 | \r | |
18 | NT Emulation Timer Architectural Protocol Driver as defined in DXE CIS\r | |
19 | \r | |
20 | This Timer module uses an NT Thread to simulate the timer-tick driven\r | |
21 | timer service. In the future, the Thread creation should possibly be \r | |
22 | abstracted by the CPU architectural protocol\r | |
23 | \r | |
6ae81428 | 24 | **/\r |
e331c50d | 25 | \r |
e331c50d | 26 | #include "Timer.h"\r |
27 | \r | |
28 | //\r | |
29 | // Pointer to the CPU Architectural Protocol instance\r | |
30 | //\r | |
31 | EFI_CPU_ARCH_PROTOCOL *mCpu;\r | |
32 | \r | |
33 | //\r | |
34 | // The Timer Architectural Protocol that this driver produces\r | |
35 | //\r | |
36 | EFI_TIMER_ARCH_PROTOCOL mTimer = {\r | |
37 | WinNtTimerDriverRegisterHandler,\r | |
38 | WinNtTimerDriverSetTimerPeriod,\r | |
39 | WinNtTimerDriverGetTimerPeriod,\r | |
40 | WinNtTimerDriverGenerateSoftInterrupt\r | |
41 | };\r | |
42 | \r | |
43 | //\r | |
44 | // Define a global that we can use to shut down the NT timer thread when\r | |
45 | // the timer is canceled.\r | |
46 | //\r | |
47 | BOOLEAN mCancelTimerThread = FALSE;\r | |
48 | \r | |
49 | //\r | |
50 | // The notification function to call on every timer interrupt\r | |
51 | //\r | |
52 | EFI_TIMER_NOTIFY mTimerNotifyFunction = NULL;\r | |
53 | \r | |
54 | //\r | |
55 | // The current period of the timer interrupt\r | |
56 | //\r | |
57 | UINT64 mTimerPeriod;\r | |
58 | \r | |
59 | //\r | |
60 | // The thread handle for this driver\r | |
61 | //\r | |
62 | HANDLE mNtMainThreadHandle;\r | |
63 | \r | |
64 | //\r | |
65 | // The timer value from the last timer interrupt\r | |
66 | //\r | |
67 | UINT32 mNtLastTick;\r | |
68 | \r | |
69 | //\r | |
70 | // Critical section used to update varibles shared between the main thread and\r | |
71 | // the timer interrupt thread.\r | |
72 | //\r | |
73 | CRITICAL_SECTION mNtCriticalSection;\r | |
74 | \r | |
75 | //\r | |
76 | // Worker Functions\r | |
77 | //\r | |
78 | UINT mMMTimerThreadID = 0;\r | |
79 | \r | |
80 | VOID\r | |
81 | CALLBACK\r | |
82 | MMTimerThread (\r | |
83 | UINT wTimerID,\r | |
84 | UINT msg,\r | |
85 | DWORD dwUser,\r | |
86 | DWORD dw1,\r | |
87 | DWORD dw2\r | |
88 | )\r | |
89 | /*++\r | |
90 | \r | |
91 | Routine Description:\r | |
92 | \r | |
93 | TODO: Add function description\r | |
94 | \r | |
95 | Arguments:\r | |
96 | \r | |
97 | wTimerID - TODO: add argument description\r | |
98 | msg - TODO: add argument description\r | |
99 | dwUser - TODO: add argument description\r | |
100 | dw1 - TODO: add argument description\r | |
101 | dw2 - TODO: add argument description\r | |
102 | \r | |
103 | Returns:\r | |
104 | \r | |
105 | TODO: add return values\r | |
106 | \r | |
107 | --*/\r | |
108 | {\r | |
109 | EFI_TPL OriginalTPL;\r | |
110 | UINT32 CurrentTick;\r | |
111 | UINT32 Delta;\r | |
112 | EFI_TIMER_NOTIFY CallbackFunction;\r | |
113 | BOOLEAN InterruptState;\r | |
114 | \r | |
115 | if (!mCancelTimerThread) {\r | |
116 | \r | |
117 | //\r | |
1710eeb8 | 118 | // Suspend the main thread until we are done.\r |
119 | // Enter the critical section before suspending\r | |
120 | // and leave the critical section after resuming\r | |
121 | // to avoid deadlock between main and timer thread.\r | |
e331c50d | 122 | //\r |
1710eeb8 | 123 | gWinNt->EnterCriticalSection (&mNtCriticalSection);\r |
e331c50d | 124 | gWinNt->SuspendThread (mNtMainThreadHandle);\r |
125 | \r | |
126 | //\r | |
127 | // If the timer thread is being canceled, then bail immediately.\r | |
128 | // We check again here because there's a small window of time from when\r | |
129 | // this thread was kicked off and when we suspended the main thread above.\r | |
130 | //\r | |
131 | if (mCancelTimerThread) {\r | |
132 | gWinNt->ResumeThread (mNtMainThreadHandle);\r | |
1710eeb8 | 133 | gWinNt->LeaveCriticalSection (&mNtCriticalSection);\r |
e331c50d | 134 | gWinNt->timeKillEvent (wTimerID);\r |
135 | mMMTimerThreadID = 0;\r | |
136 | return ;\r | |
137 | }\r | |
138 | \r | |
139 | mCpu->GetInterruptState (mCpu, &InterruptState);\r | |
140 | while (!InterruptState) {\r | |
141 | //\r | |
142 | // Resume the main thread\r | |
143 | //\r | |
144 | gWinNt->ResumeThread (mNtMainThreadHandle);\r | |
1710eeb8 | 145 | gWinNt->LeaveCriticalSection (&mNtCriticalSection);\r |
e331c50d | 146 | \r |
147 | //\r | |
148 | // Wait for interrupts to be enabled.\r | |
149 | //\r | |
150 | mCpu->GetInterruptState (mCpu, &InterruptState);\r | |
151 | while (!InterruptState) {\r | |
6157b6c3 | 152 | gWinNt->Sleep (1);\r |
e331c50d | 153 | mCpu->GetInterruptState (mCpu, &InterruptState);\r |
154 | }\r | |
155 | \r | |
156 | //\r | |
157 | // Suspend the main thread until we are done\r | |
158 | //\r | |
1710eeb8 | 159 | gWinNt->EnterCriticalSection (&mNtCriticalSection);\r |
e331c50d | 160 | gWinNt->SuspendThread (mNtMainThreadHandle);\r |
161 | mCpu->GetInterruptState (mCpu, &InterruptState);\r | |
162 | }\r | |
163 | \r | |
164 | //\r | |
165 | // Get the current system tick\r | |
166 | //\r | |
167 | CurrentTick = gWinNt->GetTickCount ();\r | |
168 | Delta = CurrentTick - mNtLastTick;\r | |
169 | mNtLastTick = CurrentTick;\r | |
170 | \r | |
171 | //\r | |
172 | // If delay was more then 1 second, ignore it (probably debugging case)\r | |
173 | //\r | |
174 | if (Delta < 1000) {\r | |
175 | \r | |
176 | OriginalTPL = gBS->RaiseTPL (TPL_HIGH_LEVEL);\r | |
177 | \r | |
178 | //\r | |
179 | // Inform the firmware of an "timer interrupt". The time\r | |
180 | // expired since the last call is 10,000 times the number\r | |
181 | // of ms. (or 100ns units)\r | |
182 | //\r | |
e331c50d | 183 | CallbackFunction = mTimerNotifyFunction;\r |
e331c50d | 184 | \r |
185 | //\r | |
186 | // Only invoke the callback function if a Non-NULL handler has been\r | |
187 | // registered. Assume all other handlers are legal.\r | |
188 | //\r | |
189 | if (CallbackFunction != NULL) {\r | |
190 | CallbackFunction ((UINT64) (Delta * 10000));\r | |
191 | }\r | |
192 | \r | |
193 | gBS->RestoreTPL (OriginalTPL);\r | |
194 | \r | |
195 | }\r | |
196 | \r | |
197 | //\r | |
198 | // Resume the main thread\r | |
199 | //\r | |
200 | gWinNt->ResumeThread (mNtMainThreadHandle);\r | |
1710eeb8 | 201 | gWinNt->LeaveCriticalSection (&mNtCriticalSection);\r |
e331c50d | 202 | } else {\r |
203 | gWinNt->timeKillEvent (wTimerID);\r | |
204 | mMMTimerThreadID = 0;\r | |
205 | }\r | |
206 | \r | |
207 | }\r | |
208 | \r | |
209 | UINT\r | |
210 | CreateNtTimer (\r | |
211 | VOID\r | |
212 | )\r | |
213 | /*++\r | |
214 | \r | |
215 | Routine Description:\r | |
216 | \r | |
217 | It is used to emulate a platform \r | |
218 | timer-driver interrupt handler. \r | |
219 | \r | |
220 | Returns:\r | |
221 | \r | |
222 | Timer ID\r | |
223 | \r | |
224 | --*/\r | |
225 | // TODO: function comment is missing 'Arguments:'\r | |
226 | {\r | |
227 | UINT32 SleepCount;\r | |
228 | \r | |
229 | //\r | |
230 | // Set our thread priority higher than the "main" thread.\r | |
231 | //\r | |
232 | gWinNt->SetThreadPriority (\r | |
233 | gWinNt->GetCurrentThread (),\r | |
234 | THREAD_PRIORITY_HIGHEST\r | |
235 | );\r | |
236 | \r | |
237 | //\r | |
238 | // Calc the appropriate interval\r | |
239 | //\r | |
240 | gWinNt->EnterCriticalSection (&mNtCriticalSection);\r | |
241 | SleepCount = (UINT32) (mTimerPeriod + 5000) / 10000;\r | |
242 | gWinNt->LeaveCriticalSection (&mNtCriticalSection);\r | |
243 | \r | |
244 | return gWinNt->timeSetEvent (\r | |
245 | SleepCount,\r | |
246 | 0,\r | |
247 | MMTimerThread,\r | |
248 | (DWORD_PTR) NULL,\r | |
249 | TIME_PERIODIC | TIME_KILL_SYNCHRONOUS | TIME_CALLBACK_FUNCTION\r | |
250 | );\r | |
251 | \r | |
252 | }\r | |
253 | \r | |
254 | EFI_STATUS\r | |
255 | EFIAPI\r | |
256 | WinNtTimerDriverRegisterHandler (\r | |
257 | IN EFI_TIMER_ARCH_PROTOCOL *This,\r | |
258 | IN EFI_TIMER_NOTIFY NotifyFunction\r | |
259 | )\r | |
260 | /*++\r | |
261 | \r | |
262 | Routine Description:\r | |
263 | \r | |
264 | This function registers the handler NotifyFunction so it is called every time \r | |
265 | the timer interrupt fires. It also passes the amount of time since the last \r | |
266 | handler call to the NotifyFunction. If NotifyFunction is NULL, then the \r | |
267 | handler is unregistered. If the handler is registered, then EFI_SUCCESS is \r | |
268 | returned. If the CPU does not support registering a timer interrupt handler, \r | |
269 | then EFI_UNSUPPORTED is returned. If an attempt is made to register a handler \r | |
270 | when a handler is already registered, then EFI_ALREADY_STARTED is returned. \r | |
271 | If an attempt is made to unregister a handler when a handler is not registered, \r | |
272 | then EFI_INVALID_PARAMETER is returned. If an error occurs attempting to \r | |
273 | register the NotifyFunction with the timer interrupt, then EFI_DEVICE_ERROR \r | |
274 | is returned.\r | |
275 | \r | |
276 | Arguments:\r | |
277 | \r | |
278 | This - The EFI_TIMER_ARCH_PROTOCOL instance.\r | |
279 | \r | |
280 | NotifyFunction - The function to call when a timer interrupt fires. This \r | |
281 | function executes at TPL_HIGH_LEVEL. The DXE Core will \r | |
282 | register a handler for the timer interrupt, so it can know \r | |
283 | how much time has passed. This information is used to \r | |
284 | signal timer based events. NULL will unregister the handler.\r | |
285 | \r | |
286 | Returns: \r | |
287 | \r | |
288 | EFI_SUCCESS - The timer handler was registered.\r | |
289 | \r | |
290 | EFI_UNSUPPORTED - The platform does not support timer interrupts.\r | |
291 | \r | |
292 | EFI_ALREADY_STARTED - NotifyFunction is not NULL, and a handler is already \r | |
293 | registered.\r | |
294 | \r | |
295 | EFI_INVALID_PARAMETER - NotifyFunction is NULL, and a handler was not \r | |
296 | previously registered.\r | |
297 | \r | |
298 | EFI_DEVICE_ERROR - The timer handler could not be registered.\r | |
299 | \r | |
300 | --*/\r | |
301 | {\r | |
302 | //\r | |
303 | // Check for invalid parameters\r | |
304 | //\r | |
305 | if (NotifyFunction == NULL && mTimerNotifyFunction == NULL) {\r | |
306 | return EFI_INVALID_PARAMETER;\r | |
307 | }\r | |
308 | \r | |
309 | if (NotifyFunction != NULL && mTimerNotifyFunction != NULL) {\r | |
310 | return EFI_ALREADY_STARTED;\r | |
311 | }\r | |
312 | \r | |
313 | //\r | |
314 | // Use Critical Section to update the notification function that is\r | |
315 | // used from the timer interrupt thread.\r | |
316 | //\r | |
317 | gWinNt->EnterCriticalSection (&mNtCriticalSection);\r | |
318 | \r | |
319 | mTimerNotifyFunction = NotifyFunction;\r | |
320 | \r | |
321 | gWinNt->LeaveCriticalSection (&mNtCriticalSection);\r | |
322 | \r | |
323 | return EFI_SUCCESS;\r | |
324 | }\r | |
325 | \r | |
326 | EFI_STATUS\r | |
327 | EFIAPI\r | |
328 | WinNtTimerDriverSetTimerPeriod (\r | |
329 | IN EFI_TIMER_ARCH_PROTOCOL *This,\r | |
330 | IN UINT64 TimerPeriod\r | |
331 | )\r | |
332 | /*++\r | |
333 | \r | |
334 | Routine Description:\r | |
335 | \r | |
336 | This function adjusts the period of timer interrupts to the value specified \r | |
337 | by TimerPeriod. If the timer period is updated, then the selected timer \r | |
338 | period is stored in EFI_TIMER.TimerPeriod, and EFI_SUCCESS is returned. If \r | |
339 | the timer hardware is not programmable, then EFI_UNSUPPORTED is returned. \r | |
340 | If an error occurs while attempting to update the timer period, then the \r | |
341 | timer hardware will be put back in its state prior to this call, and \r | |
342 | EFI_DEVICE_ERROR is returned. If TimerPeriod is 0, then the timer interrupt \r | |
343 | is disabled. This is not the same as disabling the CPU's interrupts. \r | |
344 | Instead, it must either turn off the timer hardware, or it must adjust the \r | |
345 | interrupt controller so that a CPU interrupt is not generated when the timer \r | |
346 | interrupt fires. \r | |
347 | \r | |
348 | Arguments:\r | |
349 | \r | |
350 | This - The EFI_TIMER_ARCH_PROTOCOL instance.\r | |
351 | \r | |
352 | TimerPeriod - The rate to program the timer interrupt in 100 nS units. If \r | |
353 | the timer hardware is not programmable, then EFI_UNSUPPORTED is \r | |
354 | returned. If the timer is programmable, then the timer period \r | |
355 | will be rounded up to the nearest timer period that is supported \r | |
356 | by the timer hardware. If TimerPeriod is set to 0, then the \r | |
357 | timer interrupts will be disabled.\r | |
358 | \r | |
359 | Returns: \r | |
360 | \r | |
361 | EFI_SUCCESS - The timer period was changed.\r | |
362 | \r | |
363 | EFI_UNSUPPORTED - The platform cannot change the period of the timer interrupt.\r | |
364 | \r | |
365 | EFI_DEVICE_ERROR - The timer period could not be changed due to a device error.\r | |
366 | \r | |
367 | --*/\r | |
368 | {\r | |
369 | \r | |
370 | //\r | |
371 | // If TimerPeriod is 0, then the timer thread should be canceled\r | |
372 | //\r | |
373 | if (TimerPeriod == 0) {\r | |
374 | //\r | |
375 | // Cancel the timer thread\r | |
376 | //\r | |
377 | gWinNt->EnterCriticalSection (&mNtCriticalSection);\r | |
378 | \r | |
379 | mCancelTimerThread = TRUE;\r | |
380 | \r | |
381 | gWinNt->LeaveCriticalSection (&mNtCriticalSection);\r | |
382 | \r | |
383 | //\r | |
384 | // Wait for the timer thread to exit\r | |
385 | //\r | |
386 | \r | |
387 | if (mMMTimerThreadID) {\r | |
388 | gWinNt->timeKillEvent (mMMTimerThreadID);\r | |
389 | }\r | |
390 | \r | |
391 | mMMTimerThreadID = 0;\r | |
392 | \r | |
393 | //\r | |
394 | // Update the timer period\r | |
395 | //\r | |
396 | gWinNt->EnterCriticalSection (&mNtCriticalSection);\r | |
397 | \r | |
398 | mTimerPeriod = TimerPeriod;\r | |
399 | \r | |
400 | gWinNt->LeaveCriticalSection (&mNtCriticalSection);\r | |
401 | \r | |
402 | //\r | |
403 | // NULL out the thread handle so it will be re-created if the timer is enabled again\r | |
404 | //\r | |
405 | \r | |
406 | } else if ((TimerPeriod > TIMER_MINIMUM_VALUE) && (TimerPeriod < TIMER_MAXIMUM_VALUE)) {\r | |
407 | //\r | |
408 | // If the TimerPeriod is valid, then create and/or adjust the period of the timer thread\r | |
409 | //\r | |
410 | gWinNt->EnterCriticalSection (&mNtCriticalSection);\r | |
411 | \r | |
412 | mTimerPeriod = TimerPeriod;\r | |
413 | \r | |
414 | mCancelTimerThread = FALSE;\r | |
415 | \r | |
416 | gWinNt->LeaveCriticalSection (&mNtCriticalSection);\r | |
417 | \r | |
418 | //\r | |
419 | // Get the starting tick location if we are just starting the timer thread\r | |
420 | //\r | |
421 | mNtLastTick = gWinNt->GetTickCount ();\r | |
422 | \r | |
423 | if (mMMTimerThreadID) {\r | |
424 | gWinNt->timeKillEvent (mMMTimerThreadID);\r | |
425 | }\r | |
426 | \r | |
427 | mMMTimerThreadID = 0;\r | |
428 | \r | |
429 | mMMTimerThreadID = CreateNtTimer ();\r | |
430 | \r | |
431 | }\r | |
432 | \r | |
433 | return EFI_SUCCESS;\r | |
434 | }\r | |
435 | \r | |
436 | EFI_STATUS\r | |
437 | EFIAPI\r | |
438 | WinNtTimerDriverGetTimerPeriod (\r | |
439 | IN EFI_TIMER_ARCH_PROTOCOL *This,\r | |
440 | OUT UINT64 *TimerPeriod\r | |
441 | )\r | |
442 | /*++\r | |
443 | \r | |
444 | Routine Description:\r | |
445 | \r | |
446 | This function retrieves the period of timer interrupts in 100 ns units, \r | |
447 | returns that value in TimerPeriod, and returns EFI_SUCCESS. If TimerPeriod \r | |
448 | is NULL, then EFI_INVALID_PARAMETER is returned. If a TimerPeriod of 0 is \r | |
449 | returned, then the timer is currently disabled.\r | |
450 | \r | |
451 | Arguments:\r | |
452 | \r | |
453 | This - The EFI_TIMER_ARCH_PROTOCOL instance.\r | |
454 | \r | |
455 | TimerPeriod - A pointer to the timer period to retrieve in 100 ns units. If \r | |
456 | 0 is returned, then the timer is currently disabled.\r | |
457 | \r | |
458 | Returns: \r | |
459 | \r | |
460 | EFI_SUCCESS - The timer period was returned in TimerPeriod.\r | |
461 | \r | |
462 | EFI_INVALID_PARAMETER - TimerPeriod is NULL.\r | |
463 | \r | |
464 | --*/\r | |
465 | {\r | |
466 | if (TimerPeriod == NULL) {\r | |
467 | return EFI_INVALID_PARAMETER;\r | |
468 | }\r | |
469 | \r | |
470 | *TimerPeriod = mTimerPeriod;\r | |
471 | \r | |
472 | return EFI_SUCCESS;\r | |
473 | }\r | |
474 | \r | |
475 | EFI_STATUS\r | |
476 | EFIAPI\r | |
477 | WinNtTimerDriverGenerateSoftInterrupt (\r | |
478 | IN EFI_TIMER_ARCH_PROTOCOL *This\r | |
479 | )\r | |
480 | /*++\r | |
481 | \r | |
482 | Routine Description:\r | |
483 | \r | |
484 | This function generates a soft timer interrupt. If the platform does not support soft \r | |
485 | timer interrupts, then EFI_UNSUPPORTED is returned. Otherwise, EFI_SUCCESS is returned. \r | |
486 | If a handler has been registered through the EFI_TIMER_ARCH_PROTOCOL.RegisterHandler() \r | |
487 | service, then a soft timer interrupt will be generated. If the timer interrupt is \r | |
488 | enabled when this service is called, then the registered handler will be invoked. The \r | |
489 | registered handler should not be able to distinguish a hardware-generated timer \r | |
490 | interrupt from a software-generated timer interrupt.\r | |
491 | \r | |
492 | Arguments:\r | |
493 | \r | |
494 | This - The EFI_TIMER_ARCH_PROTOCOL instance.\r | |
495 | \r | |
496 | Returns: \r | |
497 | \r | |
498 | EFI_SUCCESS - The soft timer interrupt was generated.\r | |
499 | \r | |
500 | EFI_UNSUPPORTEDT - The platform does not support the generation of soft timer interrupts.\r | |
501 | \r | |
502 | --*/\r | |
503 | {\r | |
504 | return EFI_UNSUPPORTED;\r | |
505 | }\r | |
506 | \r | |
507 | \r | |
508 | EFI_STATUS\r | |
509 | EFIAPI\r | |
510 | WinNtTimerDriverInitialize (\r | |
511 | IN EFI_HANDLE ImageHandle,\r | |
512 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
513 | )\r | |
514 | /*++\r | |
515 | \r | |
516 | Routine Description:\r | |
517 | \r | |
518 | Initialize the Timer Architectural Protocol driver\r | |
519 | \r | |
520 | Arguments:\r | |
521 | \r | |
522 | ImageHandle - ImageHandle of the loaded driver\r | |
523 | \r | |
524 | SystemTable - Pointer to the System Table\r | |
525 | \r | |
526 | Returns:\r | |
527 | \r | |
528 | EFI_SUCCESS - Timer Architectural Protocol created\r | |
529 | \r | |
530 | EFI_OUT_OF_RESOURCES - Not enough resources available to initialize driver.\r | |
531 | \r | |
532 | EFI_DEVICE_ERROR - A device error occured attempting to initialize the driver.\r | |
533 | \r | |
534 | --*/\r | |
535 | {\r | |
536 | EFI_STATUS Status;\r | |
537 | UINTN Result;\r | |
538 | EFI_HANDLE Handle;\r | |
0b94e319 | 539 | EFI_HANDLE hSourceProcessHandle;\r |
540 | EFI_HANDLE hSourceHandle;\r | |
541 | EFI_HANDLE hTargetProcessHandle;\r | |
e331c50d | 542 | //\r |
543 | // Make sure the Timer Architectural Protocol is not already installed in the system\r | |
544 | //\r | |
545 | ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEfiTimerArchProtocolGuid);\r | |
546 | \r | |
547 | //\r | |
548 | // Get the CPU Architectural Protocol instance\r | |
549 | //\r | |
0b94e319 | 550 | Status = gBS->LocateProtocol (&gEfiCpuArchProtocolGuid, NULL, (VOID**)&mCpu);\r |
e331c50d | 551 | ASSERT_EFI_ERROR (Status);\r |
552 | \r | |
553 | //\r | |
554 | // Get our handle so the timer tick thread can suspend\r | |
555 | //\r | |
0b94e319 | 556 | hSourceProcessHandle = gWinNt->GetCurrentProcess ();\r |
557 | hSourceHandle = gWinNt->GetCurrentThread ();\r | |
558 | hTargetProcessHandle = gWinNt->GetCurrentProcess ();\r | |
e331c50d | 559 | Result = gWinNt->DuplicateHandle (\r |
0b94e319 | 560 | hSourceProcessHandle,\r |
561 | hSourceHandle,\r | |
562 | hTargetProcessHandle,\r | |
e331c50d | 563 | &mNtMainThreadHandle,\r |
564 | 0,\r | |
565 | FALSE,\r | |
566 | DUPLICATE_SAME_ACCESS\r | |
567 | );\r | |
568 | if (Result == 0) {\r | |
569 | return EFI_DEVICE_ERROR;\r | |
570 | }\r | |
571 | \r | |
572 | //\r | |
573 | // Initialize Critical Section used to update variables shared between the main\r | |
574 | // thread and the timer interrupt thread.\r | |
575 | //\r | |
576 | gWinNt->InitializeCriticalSection (&mNtCriticalSection);\r | |
577 | \r | |
578 | //\r | |
579 | // Start the timer thread at the default timer period\r | |
580 | //\r | |
581 | Status = mTimer.SetTimerPeriod (&mTimer, DEFAULT_TIMER_TICK_DURATION);\r | |
582 | if (EFI_ERROR (Status)) {\r | |
583 | gWinNt->DeleteCriticalSection (&mNtCriticalSection);\r | |
584 | return Status;\r | |
585 | }\r | |
586 | \r | |
587 | //\r | |
588 | // Install the Timer Architectural Protocol onto a new handle\r | |
589 | //\r | |
590 | Handle = NULL;\r | |
591 | Status = gBS->InstallProtocolInterface (\r | |
592 | &Handle,\r | |
593 | &gEfiTimerArchProtocolGuid,\r | |
594 | EFI_NATIVE_INTERFACE,\r | |
595 | &mTimer\r | |
596 | );\r | |
597 | if (EFI_ERROR (Status)) {\r | |
598 | //\r | |
599 | // Cancel the timer\r | |
600 | //\r | |
601 | mTimer.SetTimerPeriod (&mTimer, 0);\r | |
602 | gWinNt->DeleteCriticalSection (&mNtCriticalSection);\r | |
603 | return Status;\r | |
604 | }\r | |
605 | \r | |
606 | return EFI_SUCCESS;\r | |
607 | }\r |