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d7ce7006 | 1 | /** @file \r |
2 | setitimer and getitimer functions.\r | |
3 | \r | |
4 | Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>\r | |
5 | This program and the accompanying materials are licensed and made available under\r | |
6 | the terms and conditions of the BSD License that accompanies this distribution.\r | |
7 | 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 | |
13 | #include <LibConfig.h>\r | |
14 | #include <sys/EfiSysCall.h>\r | |
15 | #include <sys/time.h>\r | |
16 | #include <time.h>\r | |
17 | #include <errno.h>\r | |
18 | #include <sys/signal.h>\r | |
19 | #include <signal.h>\r | |
20 | #include <Library/UefiBootServicesTableLib.h>\r | |
21 | #include <Library/BaseMemoryLib.h>\r | |
22 | #include <Library/UefiLib.h>\r | |
23 | \r | |
24 | STATIC EFI_EVENT RealTimer = NULL;\r | |
25 | STATIC EFI_EVENT VirtualTimer = NULL;\r | |
26 | STATIC EFI_EVENT ProfTimer = NULL;\r | |
27 | \r | |
28 | STATIC struct itimerval RealTimerInfo = {{0,0},{0,0}};\r | |
29 | STATIC struct itimerval VirtualTimerInfo = {{0,0},{0,0}};\r | |
30 | STATIC struct itimerval ProfTimerInfo = {{0,0},{0,0}};\r | |
31 | \r | |
32 | /**\r | |
33 | Function to queue the next iteration of the timer.\r | |
34 | \r | |
35 | This will copy the interval part of the struct into the value and (if \r | |
36 | non-zero), then queue the next timer event.\r | |
37 | \r | |
38 | @param[in] TimerInfo The timer info structure. \r | |
39 | @param[in] Event The EFI timer event.\r | |
40 | **/\r | |
41 | VOID\r | |
42 | EFIAPI\r | |
43 | SetNext (\r | |
44 | IN struct itimerval *TimerInfo,\r | |
45 | IN EFI_EVENT Event\r | |
46 | )\r | |
47 | {\r | |
48 | EFI_STATUS Status;\r | |
49 | \r | |
50 | CopyMem(&(TimerInfo->it_value), &(TimerInfo->it_interval), sizeof(struct timeval));\r | |
51 | \r | |
52 | //\r | |
53 | // If now zero then close and be done.\r | |
54 | //\r | |
55 | if (TimerInfo->it_value.tv_sec+TimerInfo->it_value.tv_usec == 0) {\r | |
56 | if (Event != NULL) {\r | |
57 | gBS->CloseEvent(Event);\r | |
58 | Event = NULL;\r | |
59 | }\r | |
60 | return;\r | |
61 | }\r | |
62 | \r | |
63 | //\r | |
64 | // Set up for the next loop.\r | |
65 | //\r | |
66 | Status = gBS->SetTimer (\r | |
67 | Event,\r | |
68 | TimerRelative,\r | |
69 | TimerInfo->it_value.tv_sec*10000000+TimerInfo->it_value.tv_usec*1000);\r | |
70 | \r | |
71 | if (EFI_ERROR(Status)) {\r | |
72 | gBS->CloseEvent(Event);\r | |
73 | Event = NULL;\r | |
74 | }\r | |
75 | }\r | |
76 | \r | |
77 | /**\r | |
78 | Notification function for real timer.\r | |
79 | \r | |
80 | @param[in] Event The event.\r | |
81 | @param[in] Context Ignored.\r | |
82 | **/\r | |
83 | VOID\r | |
84 | EFIAPI\r | |
85 | iTimerRealNotifyFunction (\r | |
86 | IN EFI_EVENT Event,\r | |
87 | IN VOID *Context\r | |
88 | )\r | |
89 | {\r | |
90 | raise(SIGALRM);\r | |
91 | SetNext(&RealTimerInfo, RealTimer);\r | |
92 | }\r | |
93 | \r | |
94 | /**\r | |
95 | Notification function for virtual timer.\r | |
96 | \r | |
97 | @param[in] Event The event.\r | |
98 | @param[in] Context Ignored.\r | |
99 | **/\r | |
100 | VOID\r | |
101 | EFIAPI\r | |
102 | iTimerVirtualNotifyFunction (\r | |
103 | IN EFI_EVENT Event,\r | |
104 | IN VOID *Context\r | |
105 | )\r | |
106 | {\r | |
107 | raise(SIGVTALRM);\r | |
108 | SetNext(&VirtualTimerInfo, VirtualTimer);\r | |
109 | }\r | |
110 | \r | |
111 | /**\r | |
112 | Notification function for prof timer.\r | |
113 | \r | |
114 | @param[in] Event The event.\r | |
115 | @param[in] Context Ignored.\r | |
116 | **/\r | |
117 | VOID\r | |
118 | EFIAPI\r | |
119 | iTimerProfNotifyFunction (\r | |
120 | IN EFI_EVENT Event,\r | |
121 | IN VOID *Context\r | |
122 | )\r | |
123 | {\r | |
124 | raise(SIGPROF);\r | |
125 | SetNext(&ProfTimerInfo, ProfTimer);\r | |
126 | }\r | |
127 | \r | |
128 | /**\r | |
129 | The setitimer() function sets the timer specified by which to the value \r | |
130 | specified in the structure pointed to by value, and if ovalue is not a null \r | |
131 | pointer, stores the previous value of the timer in the structure pointed to\r | |
132 | by ovalue. \r | |
133 | \r | |
134 | A timer value is defined by the itimerval structure. If it_value is non-zero,\r | |
135 | it indicates the time to the next timer expiration. If it_interval is \r | |
136 | non-zero, it specifies a value to be used in reloading it_value when the \r | |
137 | timer expires. Setting it_value to 0 disables a timer, regardless of the \r | |
138 | value of it_interval. Setting it_interval to 0 disables a timer after its \r | |
139 | next expiration (assuming it_value is non-zero). \r | |
140 | \r | |
141 | ITIMER_REAL\r | |
142 | Decrements in real time. A SIGALRM signal is delivered when this timer \r | |
143 | expires. \r | |
144 | \r | |
145 | ITIMER_VIRTUAL\r | |
146 | Decrements in process virtual time. It runs only when the process is \r | |
147 | executing. A SIGVTALRM signal is delivered when it expires. \r | |
148 | \r | |
149 | ITIMER_PROF\r | |
150 | Decrements both in process virtual time and when the system is running on \r | |
151 | behalf of the process. It is designed to be used by interpreters in \r | |
152 | statistically profiling the execution of interpreted programs. Each time \r | |
153 | the ITIMER_PROF timer expires, the SIGPROF signal is delivered. \r | |
154 | \r | |
155 | @param[in] which Which timer to set. Possible values are described above.\r | |
156 | @param[in] value The new value for this timer.\r | |
157 | @param[out] ovalue The old value for this timer.\r | |
158 | \r | |
159 | @retval 0 The operation was successful.\r | |
160 | @retval -1 The operation failed. see errno for more details.\r | |
161 | **/\r | |
162 | \r | |
163 | int setitimer(\r | |
164 | int which, \r | |
165 | const struct itimerval *value,\r | |
166 | struct itimerval *ovalue\r | |
167 | )\r | |
168 | {\r | |
169 | EFI_EVENT *EventPointer;\r | |
170 | EFI_EVENT_NOTIFY NotifyFunction;\r | |
171 | EFI_STATUS Status;\r | |
172 | \r | |
173 | if (value == NULL) {\r | |
174 | errno = EINVAL;\r | |
175 | return (-1);\r | |
176 | }\r | |
177 | \r | |
178 | if (which == ITIMER_REAL) {\r | |
179 | EventPointer = &RealTimer;\r | |
180 | NotifyFunction = iTimerRealNotifyFunction;\r | |
181 | if (ovalue != NULL) {\r | |
182 | CopyMem(ovalue, &RealTimerInfo, sizeof(struct itimerval));\r | |
183 | }\r | |
184 | CopyMem(&RealTimerInfo, value, sizeof(struct itimerval));\r | |
185 | } else if (which == ITIMER_VIRTUAL) {\r | |
186 | EventPointer = &VirtualTimer;\r | |
187 | NotifyFunction = iTimerVirtualNotifyFunction;\r | |
188 | if (ovalue != NULL) {\r | |
189 | CopyMem(ovalue, &VirtualTimerInfo, sizeof(struct itimerval));\r | |
190 | }\r | |
191 | CopyMem(&VirtualTimerInfo, value, sizeof(struct itimerval));\r | |
192 | } else if (which == ITIMER_PROF) {\r | |
193 | EventPointer = &ProfTimer;\r | |
194 | NotifyFunction = iTimerProfNotifyFunction;\r | |
195 | if (ovalue != NULL) {\r | |
196 | CopyMem(ovalue, &ProfTimerInfo, sizeof(struct itimerval));\r | |
197 | }\r | |
198 | CopyMem(&ProfTimerInfo, value, sizeof(struct itimerval));\r | |
199 | } else {\r | |
200 | errno = EINVAL;\r | |
201 | return (-1);\r | |
202 | }\r | |
203 | \r | |
204 | if (*EventPointer != NULL) {\r | |
205 | gBS->CloseEvent(*EventPointer);\r | |
206 | *EventPointer = NULL;\r | |
207 | }\r | |
208 | \r | |
209 | //\r | |
210 | // This was a 'please cancel me' request.\r | |
211 | //\r | |
212 | if (value->it_value.tv_sec+value->it_value.tv_usec == 0) {\r | |
213 | return 0;\r | |
214 | }\r | |
215 | \r | |
216 | Status = gBS->CreateEvent (\r | |
217 | EVT_TIMER|EVT_NOTIFY_SIGNAL,\r | |
218 | EfiGetCurrentTpl(),\r | |
219 | NotifyFunction,\r | |
220 | NULL, // no context\r | |
221 | EventPointer);\r | |
222 | \r | |
223 | if (EFI_ERROR(Status)) {\r | |
224 | errno = EINVAL;\r | |
225 | return (-1);\r | |
226 | }\r | |
227 | \r | |
228 | Status = gBS->SetTimer (\r | |
229 | *EventPointer,\r | |
230 | TimerRelative,\r | |
231 | value->it_value.tv_sec*10000000+value->it_value.tv_usec*1000);\r | |
232 | \r | |
233 | if (EFI_ERROR(Status)) {\r | |
234 | gBS->CloseEvent(*EventPointer);\r | |
235 | *EventPointer = NULL;\r | |
236 | errno = EINVAL;\r | |
237 | return (-1);\r | |
238 | }\r | |
239 | \r | |
240 | return 0;\r | |
241 | }\r | |
242 | \r | |
243 | /**\r | |
244 | Function to get the current state of a timer.\r | |
245 | \r | |
246 | @param[in] which The identifier of the timer to get. See setitimer for \r | |
247 | details.\r | |
248 | @param[in] value The pointer to populate. must be pre-allocated to size.\r | |
249 | \r | |
250 | @return 0 The operation was successful.\r | |
251 | @return -1 The operation failed. \r | |
252 | This means that value or which had an invalid value.\r | |
253 | **/\r | |
254 | int getitimer(\r | |
255 | int which, \r | |
256 | struct itimerval *value\r | |
257 | )\r | |
258 | {\r | |
259 | \r | |
260 | if (value == NULL) {\r | |
261 | errno = EINVAL;\r | |
262 | return (-1);\r | |
263 | }\r | |
264 | \r | |
265 | if (which == ITIMER_REAL) {\r | |
266 | CopyMem(value, &RealTimerInfo, sizeof(struct itimerval));\r | |
267 | } else if (which == ITIMER_VIRTUAL) {\r | |
268 | CopyMem(value, &VirtualTimerInfo, sizeof(struct itimerval));\r | |
269 | } else if (which == ITIMER_PROF) {\r | |
270 | CopyMem(value, &ProfTimerInfo, sizeof(struct itimerval));\r | |
271 | } else {\r | |
272 | errno = EINVAL;\r | |
273 | return (-1);\r | |
274 | }\r | |
275 | \r | |
276 | return 0;\r | |
277 | } |