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1 | /** @file\r | |
2 | Core Timer Services\r | |
3 | \r | |
4 | Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>\r | |
5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
6 | \r | |
7 | **/\r | |
8 | \r | |
9 | \r | |
10 | #include "DxeMain.h"\r | |
11 | #include "Event.h"\r | |
12 | \r | |
13 | //\r | |
14 | // Internal data\r | |
15 | //\r | |
16 | \r | |
17 | LIST_ENTRY mEfiTimerList = INITIALIZE_LIST_HEAD_VARIABLE (mEfiTimerList);\r | |
18 | EFI_LOCK mEfiTimerLock = EFI_INITIALIZE_LOCK_VARIABLE (TPL_HIGH_LEVEL - 1);\r | |
19 | EFI_EVENT mEfiCheckTimerEvent = NULL;\r | |
20 | \r | |
21 | EFI_LOCK mEfiSystemTimeLock = EFI_INITIALIZE_LOCK_VARIABLE (TPL_HIGH_LEVEL);\r | |
22 | UINT64 mEfiSystemTime = 0;\r | |
23 | \r | |
24 | //\r | |
25 | // Timer functions\r | |
26 | //\r | |
27 | /**\r | |
28 | Inserts the timer event.\r | |
29 | \r | |
30 | @param Event Points to the internal structure of timer event\r | |
31 | to be installed\r | |
32 | \r | |
33 | **/\r | |
34 | VOID\r | |
35 | CoreInsertEventTimer (\r | |
36 | IN IEVENT *Event\r | |
37 | )\r | |
38 | {\r | |
39 | UINT64 TriggerTime;\r | |
40 | LIST_ENTRY *Link;\r | |
41 | IEVENT *Event2;\r | |
42 | \r | |
43 | ASSERT_LOCKED (&mEfiTimerLock);\r | |
44 | \r | |
45 | //\r | |
46 | // Get the timer's trigger time\r | |
47 | //\r | |
48 | TriggerTime = Event->Timer.TriggerTime;\r | |
49 | \r | |
50 | //\r | |
51 | // Insert the timer into the timer database in assending sorted order\r | |
52 | //\r | |
53 | for (Link = mEfiTimerList.ForwardLink; Link != &mEfiTimerList; Link = Link->ForwardLink) {\r | |
54 | Event2 = CR (Link, IEVENT, Timer.Link, EVENT_SIGNATURE);\r | |
55 | \r | |
56 | if (Event2->Timer.TriggerTime > TriggerTime) {\r | |
57 | break;\r | |
58 | }\r | |
59 | }\r | |
60 | \r | |
61 | InsertTailList (Link, &Event->Timer.Link);\r | |
62 | }\r | |
63 | \r | |
64 | /**\r | |
65 | Returns the current system time.\r | |
66 | \r | |
67 | @return The current system time\r | |
68 | \r | |
69 | **/\r | |
70 | UINT64\r | |
71 | CoreCurrentSystemTime (\r | |
72 | VOID\r | |
73 | )\r | |
74 | {\r | |
75 | UINT64 SystemTime;\r | |
76 | \r | |
77 | CoreAcquireLock (&mEfiSystemTimeLock);\r | |
78 | SystemTime = mEfiSystemTime;\r | |
79 | CoreReleaseLock (&mEfiSystemTimeLock);\r | |
80 | \r | |
81 | return SystemTime;\r | |
82 | }\r | |
83 | \r | |
84 | /**\r | |
85 | Checks the sorted timer list against the current system time.\r | |
86 | Signals any expired event timer.\r | |
87 | \r | |
88 | @param CheckEvent Not used\r | |
89 | @param Context Not used\r | |
90 | \r | |
91 | **/\r | |
92 | VOID\r | |
93 | EFIAPI\r | |
94 | CoreCheckTimers (\r | |
95 | IN EFI_EVENT CheckEvent,\r | |
96 | IN VOID *Context\r | |
97 | )\r | |
98 | {\r | |
99 | UINT64 SystemTime;\r | |
100 | IEVENT *Event;\r | |
101 | \r | |
102 | //\r | |
103 | // Check the timer database for expired timers\r | |
104 | //\r | |
105 | CoreAcquireLock (&mEfiTimerLock);\r | |
106 | SystemTime = CoreCurrentSystemTime ();\r | |
107 | \r | |
108 | while (!IsListEmpty (&mEfiTimerList)) {\r | |
109 | Event = CR (mEfiTimerList.ForwardLink, IEVENT, Timer.Link, EVENT_SIGNATURE);\r | |
110 | \r | |
111 | //\r | |
112 | // If this timer is not expired, then we're done\r | |
113 | //\r | |
114 | if (Event->Timer.TriggerTime > SystemTime) {\r | |
115 | break;\r | |
116 | }\r | |
117 | \r | |
118 | //\r | |
119 | // Remove this timer from the timer queue\r | |
120 | //\r | |
121 | \r | |
122 | RemoveEntryList (&Event->Timer.Link);\r | |
123 | Event->Timer.Link.ForwardLink = NULL;\r | |
124 | \r | |
125 | //\r | |
126 | // Signal it\r | |
127 | //\r | |
128 | CoreSignalEvent (Event);\r | |
129 | \r | |
130 | //\r | |
131 | // If this is a periodic timer, set it\r | |
132 | //\r | |
133 | if (Event->Timer.Period != 0) {\r | |
134 | //\r | |
135 | // Compute the timers new trigger time\r | |
136 | //\r | |
137 | Event->Timer.TriggerTime = Event->Timer.TriggerTime + Event->Timer.Period;\r | |
138 | \r | |
139 | //\r | |
140 | // If that's before now, then reset the timer to start from now\r | |
141 | //\r | |
142 | if (Event->Timer.TriggerTime <= SystemTime) {\r | |
143 | Event->Timer.TriggerTime = SystemTime;\r | |
144 | CoreSignalEvent (mEfiCheckTimerEvent);\r | |
145 | }\r | |
146 | \r | |
147 | //\r | |
148 | // Add the timer\r | |
149 | //\r | |
150 | CoreInsertEventTimer (Event);\r | |
151 | }\r | |
152 | }\r | |
153 | \r | |
154 | CoreReleaseLock (&mEfiTimerLock);\r | |
155 | }\r | |
156 | \r | |
157 | \r | |
158 | /**\r | |
159 | Initializes timer support.\r | |
160 | \r | |
161 | **/\r | |
162 | VOID\r | |
163 | CoreInitializeTimer (\r | |
164 | VOID\r | |
165 | )\r | |
166 | {\r | |
167 | EFI_STATUS Status;\r | |
168 | \r | |
169 | Status = CoreCreateEventInternal (\r | |
170 | EVT_NOTIFY_SIGNAL,\r | |
171 | TPL_HIGH_LEVEL - 1,\r | |
172 | CoreCheckTimers,\r | |
173 | NULL,\r | |
174 | NULL,\r | |
175 | &mEfiCheckTimerEvent\r | |
176 | );\r | |
177 | ASSERT_EFI_ERROR (Status);\r | |
178 | }\r | |
179 | \r | |
180 | \r | |
181 | /**\r | |
182 | Called by the platform code to process a tick.\r | |
183 | \r | |
184 | @param Duration The number of 100ns elapsed since the last call\r | |
185 | to TimerTick\r | |
186 | \r | |
187 | **/\r | |
188 | VOID\r | |
189 | EFIAPI\r | |
190 | CoreTimerTick (\r | |
191 | IN UINT64 Duration\r | |
192 | )\r | |
193 | {\r | |
194 | IEVENT *Event;\r | |
195 | \r | |
196 | //\r | |
197 | // Check runtiem flag in case there are ticks while exiting boot services\r | |
198 | //\r | |
199 | CoreAcquireLock (&mEfiSystemTimeLock);\r | |
200 | \r | |
201 | //\r | |
202 | // Update the system time\r | |
203 | //\r | |
204 | mEfiSystemTime += Duration;\r | |
205 | \r | |
206 | //\r | |
207 | // If the head of the list is expired, fire the timer event\r | |
208 | // to process it\r | |
209 | //\r | |
210 | if (!IsListEmpty (&mEfiTimerList)) {\r | |
211 | Event = CR (mEfiTimerList.ForwardLink, IEVENT, Timer.Link, EVENT_SIGNATURE);\r | |
212 | \r | |
213 | if (Event->Timer.TriggerTime <= mEfiSystemTime) {\r | |
214 | CoreSignalEvent (mEfiCheckTimerEvent);\r | |
215 | }\r | |
216 | }\r | |
217 | \r | |
218 | CoreReleaseLock (&mEfiSystemTimeLock);\r | |
219 | }\r | |
220 | \r | |
221 | \r | |
222 | \r | |
223 | /**\r | |
224 | Sets the type of timer and the trigger time for a timer event.\r | |
225 | \r | |
226 | @param UserEvent The timer event that is to be signaled at the\r | |
227 | specified time\r | |
228 | @param Type The type of time that is specified in\r | |
229 | TriggerTime\r | |
230 | @param TriggerTime The number of 100ns units until the timer\r | |
231 | expires\r | |
232 | \r | |
233 | @retval EFI_SUCCESS The event has been set to be signaled at the\r | |
234 | requested time\r | |
235 | @retval EFI_INVALID_PARAMETER Event or Type is not valid\r | |
236 | \r | |
237 | **/\r | |
238 | EFI_STATUS\r | |
239 | EFIAPI\r | |
240 | CoreSetTimer (\r | |
241 | IN EFI_EVENT UserEvent,\r | |
242 | IN EFI_TIMER_DELAY Type,\r | |
243 | IN UINT64 TriggerTime\r | |
244 | )\r | |
245 | {\r | |
246 | IEVENT *Event;\r | |
247 | \r | |
248 | Event = UserEvent;\r | |
249 | \r | |
250 | if (Event == NULL) {\r | |
251 | return EFI_INVALID_PARAMETER;\r | |
252 | }\r | |
253 | \r | |
254 | if (Event->Signature != EVENT_SIGNATURE) {\r | |
255 | return EFI_INVALID_PARAMETER;\r | |
256 | }\r | |
257 | \r | |
258 | if ((UINT32)Type > TimerRelative || (Event->Type & EVT_TIMER) == 0) {\r | |
259 | return EFI_INVALID_PARAMETER;\r | |
260 | }\r | |
261 | \r | |
262 | CoreAcquireLock (&mEfiTimerLock);\r | |
263 | \r | |
264 | //\r | |
265 | // If the timer is queued to the timer database, remove it\r | |
266 | //\r | |
267 | if (Event->Timer.Link.ForwardLink != NULL) {\r | |
268 | RemoveEntryList (&Event->Timer.Link);\r | |
269 | Event->Timer.Link.ForwardLink = NULL;\r | |
270 | }\r | |
271 | \r | |
272 | Event->Timer.TriggerTime = 0;\r | |
273 | Event->Timer.Period = 0;\r | |
274 | \r | |
275 | if (Type != TimerCancel) {\r | |
276 | \r | |
277 | if (Type == TimerPeriodic) {\r | |
278 | if (TriggerTime == 0) {\r | |
279 | gTimer->GetTimerPeriod (gTimer, &TriggerTime);\r | |
280 | }\r | |
281 | Event->Timer.Period = TriggerTime;\r | |
282 | }\r | |
283 | \r | |
284 | Event->Timer.TriggerTime = CoreCurrentSystemTime () + TriggerTime;\r | |
285 | CoreInsertEventTimer (Event);\r | |
286 | \r | |
287 | if (TriggerTime == 0) {\r | |
288 | CoreSignalEvent (mEfiCheckTimerEvent);\r | |
289 | }\r | |
290 | }\r | |
291 | \r | |
292 | CoreReleaseLock (&mEfiTimerLock);\r | |
293 | \r | |
294 | return EFI_SUCCESS;\r | |
295 | }\r |