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23c98c94 | 1 | /** @file\r |
504214c4 LG |
2 | Core Timer Services\r |
3 | \r | |
23c98c94 | 4 | Copyright (c) 2006 - 2008, Intel Corporation. <BR>\r |
28a00297 | 5 | All rights reserved. This program and the accompanying materials\r |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
504214c4 | 13 | **/\r |
28a00297 | 14 | \r |
15 | \r | |
16 | #include <DxeMain.h>\r | |
17 | \r | |
18 | //\r | |
19 | // Internal prototypes\r | |
20 | //\r | |
162ed594 | 21 | /**\r |
22 | Returns the current system time.\r | |
23 | \r | |
24 | @return The current system time\r | |
25 | \r | |
26 | **/\r | |
28a00297 | 27 | UINT64\r |
28 | CoreCurrentSystemTime (\r | |
29 | VOID\r | |
30 | );\r | |
31 | \r | |
162ed594 | 32 | /**\r |
33 | Checks the sorted timer list against the current system time.\r | |
34 | Signals any expired event timer.\r | |
35 | \r | |
36 | @param CheckEvent Not used \r | |
37 | @param Context Not used\r | |
38 | \r | |
39 | **/\r | |
28a00297 | 40 | VOID\r |
41 | EFIAPI\r | |
42 | CoreCheckTimers (\r | |
23c98c94 | 43 | IN EFI_EVENT CheckEvent,\r |
44 | IN VOID *Context\r | |
28a00297 | 45 | );\r |
46 | \r | |
162ed594 | 47 | /**\r |
48 | Inserts the timer event.\r | |
49 | \r | |
50 | @param Event Points to the internal structure of timer event \r | |
51 | to be installed\r | |
52 | \r | |
53 | **/\r | |
28a00297 | 54 | VOID\r |
55 | CoreInsertEventTimer (\r | |
23c98c94 | 56 | IN IEVENT *Event\r |
28a00297 | 57 | );\r |
58 | \r | |
59 | //\r | |
60 | // Internal data\r | |
61 | //\r | |
62 | \r | |
db405d1b | 63 | STATIC LIST_ENTRY mEfiTimerList = INITIALIZE_LIST_HEAD_VARIABLE (mEfiTimerList);\r |
64 | STATIC EFI_LOCK mEfiTimerLock = EFI_INITIALIZE_LOCK_VARIABLE (TPL_HIGH_LEVEL - 1);\r | |
65 | STATIC EFI_EVENT mEfiCheckTimerEvent;\r | |
28a00297 | 66 | \r |
db405d1b | 67 | STATIC EFI_LOCK mEfiSystemTimeLock = EFI_INITIALIZE_LOCK_VARIABLE (TPL_HIGH_LEVEL);\r |
68 | STATIC UINT64 mEfiSystemTime = 0;\r | |
28a00297 | 69 | \r |
70 | //\r | |
71 | // Timer functions\r | |
72 | //\r | |
73 | \r | |
162ed594 | 74 | \r |
75 | /**\r | |
76 | Initializes timer support.\r | |
77 | \r | |
78 | **/\r | |
28a00297 | 79 | VOID\r |
80 | CoreInitializeTimer (\r | |
81 | VOID\r | |
82 | )\r | |
28a00297 | 83 | {\r |
84 | EFI_STATUS Status;\r | |
85 | \r | |
86 | Status = CoreCreateEvent (\r | |
87 | EVT_NOTIFY_SIGNAL,\r | |
88 | TPL_HIGH_LEVEL - 1,\r | |
89 | CoreCheckTimers,\r | |
90 | NULL,\r | |
91 | &mEfiCheckTimerEvent\r | |
92 | );\r | |
93 | ASSERT_EFI_ERROR (Status);\r | |
94 | }\r | |
95 | \r | |
162ed594 | 96 | \r |
97 | /**\r | |
98 | Returns the current system time.\r | |
99 | \r | |
100 | @return The current system time\r | |
101 | \r | |
102 | **/\r | |
28a00297 | 103 | UINT64\r |
104 | CoreCurrentSystemTime (\r | |
105 | VOID\r | |
106 | )\r | |
28a00297 | 107 | {\r |
108 | UINT64 SystemTime;\r | |
109 | \r | |
110 | CoreAcquireLock (&mEfiSystemTimeLock);\r | |
111 | SystemTime = mEfiSystemTime;\r | |
112 | CoreReleaseLock (&mEfiSystemTimeLock);\r | |
113 | return SystemTime;\r | |
114 | }\r | |
115 | \r | |
162ed594 | 116 | \r |
117 | /**\r | |
118 | Called by the platform code to process a tick.\r | |
119 | \r | |
120 | @param Duration The number of 100ns elasped since the last call \r | |
121 | to TimerTick\r | |
122 | \r | |
123 | **/\r | |
28a00297 | 124 | VOID\r |
125 | EFIAPI\r | |
126 | CoreTimerTick (\r | |
127 | IN UINT64 Duration\r | |
128 | )\r | |
28a00297 | 129 | {\r |
130 | IEVENT *Event;\r | |
131 | \r | |
132 | //\r | |
133 | // Check runtiem flag in case there are ticks while exiting boot services\r | |
134 | //\r | |
135 | \r | |
136 | CoreAcquireLock (&mEfiSystemTimeLock);\r | |
137 | \r | |
138 | //\r | |
139 | // Update the system time\r | |
140 | //\r | |
141 | \r | |
142 | mEfiSystemTime += Duration;\r | |
143 | \r | |
144 | //\r | |
145 | // If the head of the list is expired, fire the timer event\r | |
146 | // to process it\r | |
147 | //\r | |
148 | \r | |
149 | if (!IsListEmpty (&mEfiTimerList)) {\r | |
150 | Event = CR (mEfiTimerList.ForwardLink, IEVENT, u.Timer.Link, EVENT_SIGNATURE);\r | |
151 | \r | |
152 | if (Event->u.Timer.TriggerTime <= mEfiSystemTime) {\r | |
153 | CoreSignalEvent (mEfiCheckTimerEvent);\r | |
154 | }\r | |
155 | }\r | |
156 | \r | |
157 | CoreReleaseLock (&mEfiSystemTimeLock);\r | |
158 | }\r | |
159 | \r | |
162ed594 | 160 | \r |
161 | /**\r | |
162 | Checks the sorted timer list against the current system time.\r | |
163 | Signals any expired event timer.\r | |
164 | \r | |
165 | @param CheckEvent Not used \r | |
166 | @param Context Not used\r | |
167 | \r | |
168 | **/\r | |
28a00297 | 169 | VOID\r |
170 | EFIAPI\r | |
171 | CoreCheckTimers (\r | |
172 | IN EFI_EVENT CheckEvent,\r | |
173 | IN VOID *Context\r | |
174 | )\r | |
28a00297 | 175 | {\r |
176 | UINT64 SystemTime;\r | |
177 | IEVENT *Event;\r | |
178 | \r | |
179 | //\r | |
180 | // Check the timer database for expired timers\r | |
181 | //\r | |
182 | \r | |
183 | CoreAcquireLock (&mEfiTimerLock);\r | |
184 | SystemTime = CoreCurrentSystemTime ();\r | |
185 | \r | |
186 | while (!IsListEmpty (&mEfiTimerList)) {\r | |
187 | Event = CR (mEfiTimerList.ForwardLink, IEVENT, u.Timer.Link, EVENT_SIGNATURE);\r | |
188 | \r | |
189 | //\r | |
190 | // If this timer is not expired, then we're done\r | |
191 | //\r | |
192 | \r | |
193 | if (Event->u.Timer.TriggerTime > SystemTime) {\r | |
194 | break;\r | |
195 | }\r | |
196 | \r | |
197 | //\r | |
198 | // Remove this timer from the timer queue\r | |
199 | //\r | |
200 | \r | |
201 | RemoveEntryList (&Event->u.Timer.Link);\r | |
202 | Event->u.Timer.Link.ForwardLink = NULL;\r | |
203 | \r | |
204 | //\r | |
205 | // Signal it\r | |
206 | //\r | |
207 | CoreSignalEvent (Event);\r | |
208 | \r | |
209 | //\r | |
210 | // If this is a periodic timer, set it\r | |
211 | //\r | |
212 | if (Event->u.Timer.Period) {\r | |
213 | \r | |
214 | //\r | |
215 | // Compute the timers new trigger time\r | |
216 | //\r | |
217 | \r | |
218 | Event->u.Timer.TriggerTime = Event->u.Timer.TriggerTime + Event->u.Timer.Period;\r | |
219 | \r | |
220 | //\r | |
221 | // If that's before now, then reset the timer to start from now\r | |
222 | //\r | |
223 | if (Event->u.Timer.TriggerTime <= SystemTime) {\r | |
224 | Event->u.Timer.TriggerTime = SystemTime;\r | |
225 | CoreSignalEvent (mEfiCheckTimerEvent);\r | |
226 | }\r | |
227 | \r | |
228 | //\r | |
229 | // Add the timer\r | |
230 | //\r | |
231 | \r | |
232 | CoreInsertEventTimer (Event);\r | |
233 | }\r | |
234 | }\r | |
235 | \r | |
236 | CoreReleaseLock (&mEfiTimerLock);\r | |
237 | }\r | |
238 | \r | |
162ed594 | 239 | \r |
240 | /**\r | |
241 | Inserts the timer event.\r | |
242 | \r | |
243 | @param Event Points to the internal structure of timer event \r | |
244 | to be installed\r | |
245 | \r | |
246 | **/\r | |
28a00297 | 247 | VOID\r |
248 | CoreInsertEventTimer (\r | |
249 | IN IEVENT *Event\r | |
250 | )\r | |
28a00297 | 251 | {\r |
252 | UINT64 TriggerTime;\r | |
253 | LIST_ENTRY *Link;\r | |
254 | IEVENT *Event2;\r | |
255 | \r | |
256 | ASSERT_LOCKED (&mEfiTimerLock);\r | |
257 | \r | |
258 | //\r | |
259 | // Get the timer's trigger time\r | |
260 | //\r | |
261 | \r | |
262 | TriggerTime = Event->u.Timer.TriggerTime;\r | |
263 | \r | |
264 | //\r | |
265 | // Insert the timer into the timer database in assending sorted order\r | |
266 | //\r | |
267 | \r | |
268 | for (Link = mEfiTimerList.ForwardLink; Link != &mEfiTimerList; Link = Link->ForwardLink) {\r | |
269 | Event2 = CR (Link, IEVENT, u.Timer.Link, EVENT_SIGNATURE);\r | |
270 | \r | |
271 | if (Event2->u.Timer.TriggerTime > TriggerTime) {\r | |
272 | break;\r | |
273 | }\r | |
274 | }\r | |
275 | \r | |
276 | InsertTailList (Link, &Event->u.Timer.Link);\r | |
277 | }\r | |
278 | \r | |
279 | \r | |
280 | \r | |
162ed594 | 281 | \r |
282 | /**\r | |
283 | Sets the type of timer and the trigger time for a timer event.\r | |
284 | \r | |
285 | @param UserEvent The timer event that is to be signaled at the \r | |
286 | specified time \r | |
287 | @param Type The type of time that is specified in \r | |
288 | TriggerTime \r | |
289 | @param TriggerTime The number of 100ns units until the timer \r | |
290 | expires \r | |
291 | \r | |
292 | @retval EFI_SUCCESS The event has been set to be signaled at the \r | |
293 | requested time \r | |
294 | @retval EFI_INVALID_PARAMETER Event or Type is not valid\r | |
295 | \r | |
296 | **/\r | |
28a00297 | 297 | EFI_STATUS\r |
298 | EFIAPI\r | |
299 | CoreSetTimer (\r | |
300 | IN EFI_EVENT UserEvent,\r | |
301 | IN EFI_TIMER_DELAY Type,\r | |
302 | IN UINT64 TriggerTime\r | |
303 | )\r | |
28a00297 | 304 | {\r |
305 | IEVENT *Event;\r | |
306 | \r | |
307 | Event = UserEvent;\r | |
308 | \r | |
309 | if (Event == NULL) {\r | |
310 | return EFI_INVALID_PARAMETER;\r | |
311 | }\r | |
312 | \r | |
313 | if (Event->Signature != EVENT_SIGNATURE) {\r | |
314 | return EFI_INVALID_PARAMETER;\r | |
315 | }\r | |
316 | \r | |
317 | if (Type < 0 || Type > TimerRelative || !(Event->Type & EVT_TIMER)) {\r | |
318 | return EFI_INVALID_PARAMETER;\r | |
319 | }\r | |
320 | \r | |
321 | CoreAcquireLock (&mEfiTimerLock);\r | |
322 | \r | |
323 | //\r | |
324 | // If the timer is queued to the timer database, remove it\r | |
325 | //\r | |
326 | \r | |
327 | if (Event->u.Timer.Link.ForwardLink != NULL) {\r | |
328 | RemoveEntryList (&Event->u.Timer.Link);\r | |
329 | Event->u.Timer.Link.ForwardLink = NULL;\r | |
330 | }\r | |
331 | \r | |
332 | Event->u.Timer.TriggerTime = 0;\r | |
333 | Event->u.Timer.Period = 0;\r | |
334 | \r | |
335 | if (Type != TimerCancel) {\r | |
336 | \r | |
337 | if (Type == TimerPeriodic) {\r | |
338 | Event->u.Timer.Period = TriggerTime;\r | |
339 | }\r | |
340 | \r | |
341 | Event->u.Timer.TriggerTime = CoreCurrentSystemTime () + TriggerTime;\r | |
342 | CoreInsertEventTimer (Event);\r | |
343 | \r | |
344 | if (TriggerTime == 0) {\r | |
345 | CoreSignalEvent (mEfiCheckTimerEvent);\r | |
346 | }\r | |
347 | }\r | |
348 | \r | |
349 | CoreReleaseLock (&mEfiTimerLock);\r | |
350 | return EFI_SUCCESS;\r | |
351 | }\r |