xref: /freebsd/stand/efi/libefi/time.c (revision 6580f5c38dd5b01aeeaed16b370f1a12423437f0)
1 /*-
2  * Copyright (c) 1999, 2000
3  * Intel Corporation.
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  *
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  *
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * 3. All advertising materials mentioning features or use of this software
18  *    must display the following acknowledgement:
19  *
20  *    This product includes software developed by Intel Corporation and
21  *    its contributors.
22  *
23  * 4. Neither the name of Intel Corporation or its contributors may be
24  *    used to endorse or promote products derived from this software
25  *    without specific prior written permission.
26  *
27  * THIS SOFTWARE IS PROVIDED BY INTEL CORPORATION AND CONTRIBUTORS ``AS IS''
28  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30  * ARE DISCLAIMED.  IN NO EVENT SHALL INTEL CORPORATION OR CONTRIBUTORS BE
31  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
37  * THE POSSIBILITY OF SUCH DAMAGE.
38  *
39  */
40 
41 #include <efi.h>
42 #include <efilib.h>
43 
44 #include <time.h>
45 #include <sys/time.h>
46 
47 /*
48  * Accurate only for the past couple of centuries;
49  * that will probably do.
50  *
51  * (#defines From FreeBSD 3.2 lib/libc/stdtime/tzfile.h)
52  */
53 
54 #define	isleap(y)	(((y) % 4) == 0 && \
55 			    (((y) % 100) != 0 || ((y) % 400) == 0))
56 #define	SECSPERHOUR	(60*60)
57 #define	SECSPERDAY	(24 * SECSPERHOUR)
58 
59 /*
60  *  These arrays give the cumulative number of days up to the first of the
61  *  month number used as the index (1 -> 12) for regular and leap years.
62  *  The value at index 13 is for the whole year.
63  */
64 static const time_t CumulativeDays[2][14] = {
65 	{0,
66 	0,
67 	31,
68 	31 + 28,
69 	31 + 28 + 31,
70 	31 + 28 + 31 + 30,
71 	31 + 28 + 31 + 30 + 31,
72 	31 + 28 + 31 + 30 + 31 + 30,
73 	31 + 28 + 31 + 30 + 31 + 30 + 31,
74 	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31,
75 	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
76 	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
77 	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30,
78 	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31 },
79 	{0,
80 	0,
81 	31,
82 	31 + 29,
83 	31 + 29 + 31,
84 	31 + 29 + 31 + 30,
85 	31 + 29 + 31 + 30 + 31,
86 	31 + 29 + 31 + 30 + 31 + 30,
87 	31 + 29 + 31 + 30 + 31 + 30 + 31,
88 	31 + 29 + 31 + 30 + 31 + 30 + 31 + 31,
89 	31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
90 	31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
91 	31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30,
92 	31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31 }};
93 
94 void
95 efi_time_init(void)
96 {
97 }
98 
99 void
100 efi_time_fini(void)
101 {
102 }
103 
104 void
105 to_efi_time(EFI_TIME *efi_time, time_t time)
106 {
107 	int lyear, month;
108 	time_t seconds;
109 
110 	if (time >= 0) {
111 		efi_time->Year = 1970;
112 		lyear = isleap(efi_time->Year);
113 		month = 13;
114 		seconds = CumulativeDays[lyear][month] * SECSPERDAY;
115                 while (time > seconds) {
116 			time -= seconds;
117 			efi_time->Year++;
118 			lyear = isleap(efi_time->Year);
119 			seconds = CumulativeDays[lyear][month] * SECSPERDAY;
120 		}
121 
122 		efi_time->Month = 0;
123                 while (time >
124 		    CumulativeDays[lyear][month] * SECSPERDAY) {
125 			efi_time->Month++;
126 		}
127 
128 		month = efi_time->Month - 1;
129 		time -= CumulativeDays[lyear][month] * SECSPERDAY;
130 
131 		for (efi_time->Day = 0; time > SECSPERDAY; efi_time->Day++)
132 			time -= SECSPERDAY;
133 
134 		for (efi_time->Hour = 0; time > SECSPERHOUR; efi_time->Hour++)
135 			time -= SECSPERHOUR;
136 
137 		for (efi_time->Minute = 0; time > 60; efi_time->Minute++)
138 			time -= 60;
139 
140 		efi_time->Second = time;
141 		efi_time->Nanosecond = 0;
142 		efi_time->TimeZone = 0;
143 		efi_time->Daylight = 0;
144 	} else {
145 		memset(efi_time, 0, sizeof(EFI_TIME));
146 	}
147 }
148 
149 time_t
150 from_efi_time(EFI_TIME *ETime)
151 {
152 	time_t  UTime;
153 	int	Year;
154 
155 	/*
156 	 *  Do a santity check
157 	 */
158 	if (ETime->Year  <  1998 || ETime->Year   > 2099 ||
159 	    ETime->Month ==    0 || ETime->Month  >   12 ||
160 	    ETime->Day   ==    0 || ETime->Month  >   31 ||
161 	    ETime->Hour   >   23 || ETime->Minute >   59 ||
162 	    ETime->Second >   59 || ETime->TimeZone  < -1440 ||
163 	    (ETime->TimeZone >  1440 && ETime->TimeZone != 2047)) {
164 		return (0);
165 	}
166 
167 	/*
168 	 * Years
169 	 */
170 	UTime = 0;
171 	for (Year = 1970; Year != ETime->Year; ++Year) {
172 		UTime += (CumulativeDays[isleap(Year)][13] * SECSPERDAY);
173 	}
174 
175 	/*
176 	 * UTime should now be set to 00:00:00 on Jan 1 of the file's year.
177 	 *
178 	 * Months
179 	 */
180 	UTime += (CumulativeDays[isleap(ETime->Year)][ETime->Month] *
181 	    SECSPERDAY);
182 
183 	/*
184 	 * UTime should now be set to 00:00:00 on the first of the file's
185 	 * month and year.
186 	 *
187 	 * Days -- Don't count the file's day
188 	 */
189 	UTime += (((ETime->Day > 0) ? ETime->Day-1:0) * SECSPERDAY);
190 
191 	/*
192 	 * Hours
193 	 */
194 	UTime += (ETime->Hour * SECSPERHOUR);
195 
196 	/*
197 	 * Minutes
198 	 */
199 	UTime += (ETime->Minute * 60);
200 
201 	/*
202 	 * Seconds
203 	 */
204 	UTime += ETime->Second;
205 
206 	/*
207 	 * EFI time is repored in local time.  Adjust for any time zone
208 	 * offset to get true UT
209 	 */
210 	if (ETime->TimeZone != EFI_UNSPECIFIED_TIMEZONE) {
211 		/*
212 		 * TimeZone is kept in minues...
213 		 */
214 		UTime += (ETime->TimeZone * 60);
215 	}
216 
217 	return (UTime);
218 }
219 
220 static int
221 EFI_GetTimeOfDay(OUT struct timeval *tp, OUT struct timezone *tzp)
222 {
223 	EFI_TIME		EfiTime;
224 	EFI_TIME_CAPABILITIES	Capabilities;
225 	EFI_STATUS		Status;
226 
227 	/*
228 	 *  Get time from EFI
229 	 */
230 
231 	Status = RS->GetTime(&EfiTime, &Capabilities);
232 	if (EFI_ERROR(Status))
233 		return (-1);
234 
235 	/*
236 	 *  Convert to UNIX time (ie seconds since the epoch
237 	 */
238 
239 	tp->tv_sec  = from_efi_time(&EfiTime);
240 	tp->tv_usec = 0; /* EfiTime.Nanosecond * 1000; */
241 
242 	/*
243 	 * Do something with the timezone if needed
244 	 */
245 
246 	if (tzp != NULL) {
247 		if (EfiTime.TimeZone == EFI_UNSPECIFIED_TIMEZONE)
248 			tzp->tz_minuteswest = 0;
249 		else
250 			tzp->tz_minuteswest = EfiTime.TimeZone;
251 		/*
252 		 * This isn't quit right since it doesn't deal with
253 		 * EFI_TIME_IN_DAYLIGHT
254 		 */
255 		tzp->tz_dsttime =
256 			EfiTime.Daylight & EFI_TIME_ADJUST_DAYLIGHT ? 1 : 0;
257 	}
258 
259 	return (0);
260 }
261 
262 time_t
263 time(time_t *tloc)
264 {
265 	struct timeval tv;
266 
267 	memset(&tv, 0, sizeof(tv));
268 	EFI_GetTimeOfDay(&tv, NULL);
269 
270 	if (tloc)
271 		*tloc = tv.tv_sec;
272 	return (tv.tv_sec);
273 }
274 
275 time_t
276 getsecs(void)
277 {
278 
279     return (time(NULL));
280 }
281