xref: /freebsd/stand/efi/libefi/time.c (revision 0957b409)
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 <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
43 
44 #include <efi.h>
45 #include <efilib.h>
46 
47 #include <time.h>
48 #include <sys/time.h>
49 
50 /*
51  * Accurate only for the past couple of centuries;
52  * that will probably do.
53  *
54  * (#defines From FreeBSD 3.2 lib/libc/stdtime/tzfile.h)
55  */
56 
57 #define	isleap(y)	(((y) % 4) == 0 && \
58 			    (((y) % 100) != 0 || ((y) % 400) == 0))
59 #define	SECSPERHOUR	(60*60)
60 #define	SECSPERDAY	(24 * SECSPERHOUR)
61 
62 /*
63  *  These arrays give the cumulative number of days up to the first of the
64  *  month number used as the index (1 -> 12) for regular and leap years.
65  *  The value at index 13 is for the whole year.
66  */
67 static const time_t CumulativeDays[2][14] = {
68 	{0,
69 	0,
70 	31,
71 	31 + 28,
72 	31 + 28 + 31,
73 	31 + 28 + 31 + 30,
74 	31 + 28 + 31 + 30 + 31,
75 	31 + 28 + 31 + 30 + 31 + 30,
76 	31 + 28 + 31 + 30 + 31 + 30 + 31,
77 	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31,
78 	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
79 	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
80 	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30,
81 	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31 },
82 	{0,
83 	0,
84 	31,
85 	31 + 29,
86 	31 + 29 + 31,
87 	31 + 29 + 31 + 30,
88 	31 + 29 + 31 + 30 + 31,
89 	31 + 29 + 31 + 30 + 31 + 30,
90 	31 + 29 + 31 + 30 + 31 + 30 + 31,
91 	31 + 29 + 31 + 30 + 31 + 30 + 31 + 31,
92 	31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
93 	31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
94 	31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30,
95 	31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31 }};
96 
97 void
98 efi_time_init(void)
99 {
100 }
101 
102 void
103 efi_time_fini(void)
104 {
105 }
106 
107 void
108 to_efi_time(EFI_TIME *efi_time, time_t time)
109 {
110 	int lyear, month;
111 	time_t seconds;
112 
113 	if (time >= 0) {
114 		efi_time->Year = 1970;
115 		lyear = isleap(efi_time->Year);
116 		month = 13;
117 		seconds = CumulativeDays[lyear][month] * SECSPERDAY;
118                 while (time > seconds) {
119 			time -= seconds;
120 			efi_time->Year++;
121 			lyear = isleap(efi_time->Year);
122 			seconds = CumulativeDays[lyear][month] * SECSPERDAY;
123 		}
124 
125 		efi_time->Month = 0;
126                 while (time >
127 		    CumulativeDays[lyear][month] * SECSPERDAY) {
128 			efi_time->Month++;
129 		}
130 
131 		month = efi_time->Month - 1;
132 		time -= CumulativeDays[lyear][month] * SECSPERDAY;
133 
134 		for (efi_time->Day = 0; time > SECSPERDAY; efi_time->Day++)
135 			time -= SECSPERDAY;
136 
137 		for (efi_time->Hour = 0; time > SECSPERHOUR; efi_time->Hour++)
138 			time -= SECSPERHOUR;
139 
140 		for (efi_time->Minute = 0; time > 60; efi_time->Minute++)
141 			time -= 60;
142 
143 		efi_time->Second = time;
144 		efi_time->Nanosecond = 0;
145 		efi_time->TimeZone = 0;
146 		efi_time->Daylight = 0;
147 	} else {
148 		memset(efi_time, 0, sizeof(EFI_TIME));
149 	}
150 }
151 
152 time_t
153 from_efi_time(EFI_TIME *ETime)
154 {
155 	time_t  UTime;
156 	int	Year;
157 
158 	/*
159 	 *  Do a santity check
160 	 */
161 	if (ETime->Year  <  1998 || ETime->Year   > 2099 ||
162 	    ETime->Month ==    0 || ETime->Month  >   12 ||
163 	    ETime->Day   ==    0 || ETime->Month  >   31 ||
164 	    ETime->Hour   >   23 || ETime->Minute >   59 ||
165 	    ETime->Second >   59 || ETime->TimeZone  < -1440 ||
166 	    (ETime->TimeZone >  1440 && ETime->TimeZone != 2047)) {
167 		return (0);
168 	}
169 
170 	/*
171 	 * Years
172 	 */
173 	UTime = 0;
174 	for (Year = 1970; Year != ETime->Year; ++Year) {
175 		UTime += (CumulativeDays[isleap(Year)][13] * SECSPERDAY);
176 	}
177 
178 	/*
179 	 * UTime should now be set to 00:00:00 on Jan 1 of the file's year.
180 	 *
181 	 * Months
182 	 */
183 	UTime += (CumulativeDays[isleap(ETime->Year)][ETime->Month] *
184 	    SECSPERDAY);
185 
186 	/*
187 	 * UTime should now be set to 00:00:00 on the first of the file's
188 	 * month and year.
189 	 *
190 	 * Days -- Don't count the file's day
191 	 */
192 	UTime += (((ETime->Day > 0) ? ETime->Day-1:0) * SECSPERDAY);
193 
194 	/*
195 	 * Hours
196 	 */
197 	UTime += (ETime->Hour * SECSPERHOUR);
198 
199 	/*
200 	 * Minutes
201 	 */
202 	UTime += (ETime->Minute * 60);
203 
204 	/*
205 	 * Seconds
206 	 */
207 	UTime += ETime->Second;
208 
209 	/*
210 	 * EFI time is repored in local time.  Adjust for any time zone
211 	 * offset to get true UT
212 	 */
213 	if (ETime->TimeZone != EFI_UNSPECIFIED_TIMEZONE) {
214 		/*
215 		 * TimeZone is kept in minues...
216 		 */
217 		UTime += (ETime->TimeZone * 60);
218 	}
219 
220 	return (UTime);
221 }
222 
223 static int
224 EFI_GetTimeOfDay(OUT struct timeval *tp, OUT struct timezone *tzp)
225 {
226 	EFI_TIME		EfiTime;
227 	EFI_TIME_CAPABILITIES	Capabilities;
228 	EFI_STATUS		Status;
229 
230 	/*
231 	 *  Get time from EFI
232 	 */
233 
234 	Status = RS->GetTime(&EfiTime, &Capabilities);
235 	if (EFI_ERROR(Status))
236 		return (-1);
237 
238 	/*
239 	 *  Convert to UNIX time (ie seconds since the epoch
240 	 */
241 
242 	tp->tv_sec  = from_efi_time(&EfiTime);
243 	tp->tv_usec = 0; /* EfiTime.Nanosecond * 1000; */
244 
245 	/*
246 	 * Do something with the timezone if needed
247 	 */
248 
249 	if (tzp != NULL) {
250 		if (EfiTime.TimeZone == EFI_UNSPECIFIED_TIMEZONE)
251 			tzp->tz_minuteswest = 0;
252 		else
253 			tzp->tz_minuteswest = EfiTime.TimeZone;
254 		/*
255 		 * This isn't quit right since it doesn't deal with
256 		 * EFI_TIME_IN_DAYLIGHT
257 		 */
258 		tzp->tz_dsttime =
259 			EfiTime.Daylight & EFI_TIME_ADJUST_DAYLIGHT ? 1 : 0;
260 	}
261 
262 	return (0);
263 }
264 
265 time_t
266 time(time_t *tloc)
267 {
268 	struct timeval tv;
269 
270 	memset(&tv, 0, sizeof(tv));
271 	EFI_GetTimeOfDay(&tv, NULL);
272 
273 	if (tloc)
274 		*tloc = tv.tv_sec;
275 	return (tv.tv_sec);
276 }
277 
278 time_t
279 getsecs(void)
280 {
281 
282     return (time(NULL));
283 }
284