xref: /illumos-gate/usr/src/boot/sys/boot/efi/libefi/time.c (revision 5e9f42ab)
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 
43 #include <efi.h>
44 #include <efilib.h>
45 
46 #include <time.h>
47 #include <sys/time.h>
48 
49 /*
50  * Accurate only for the past couple of centuries;
51  * that will probably do.
52  *
53  * (#defines From FreeBSD 3.2 lib/libc/stdtime/tzfile.h)
54  */
55 
56 #define	isleap(y)	(((y) % 4) == 0 && \
57 			    (((y) % 100) != 0 || ((y) % 400) == 0))
58 #define	SECSPERHOUR	(60*60)
59 #define	SECSPERDAY	(24 * SECSPERHOUR)
60 
61 /*
62  *  These arrays give the cumulative number of days up to the first of the
63  *  month number used as the index (1 -> 12) for regular and leap years.
64  *  The value at index 13 is for the whole year.
65  */
66 static const time_t CumulativeDays[2][14] = {
67 	{0,
68 	0,
69 	31,
70 	31 + 28,
71 	31 + 28 + 31,
72 	31 + 28 + 31 + 30,
73 	31 + 28 + 31 + 30 + 31,
74 	31 + 28 + 31 + 30 + 31 + 30,
75 	31 + 28 + 31 + 30 + 31 + 30 + 31,
76 	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31,
77 	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
78 	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
79 	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30,
80 	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31 },
81 	{0,
82 	0,
83 	31,
84 	31 + 29,
85 	31 + 29 + 31,
86 	31 + 29 + 31 + 30,
87 	31 + 29 + 31 + 30 + 31,
88 	31 + 29 + 31 + 30 + 31 + 30,
89 	31 + 29 + 31 + 30 + 31 + 30 + 31,
90 	31 + 29 + 31 + 30 + 31 + 30 + 31 + 31,
91 	31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
92 	31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
93 	31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30,
94 	31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31 }};
95 
96 void
efi_time_init(void)97 efi_time_init(void)
98 {
99 }
100 
101 void
efi_time_fini(void)102 efi_time_fini(void)
103 {
104 }
105 
106 void
to_efi_time(EFI_TIME * efi_time,time_t time)107 to_efi_time(EFI_TIME *efi_time, time_t time)
108 {
109 	int lyear, month;
110 	time_t seconds;
111 
112 	if (time >= 0) {
113 		efi_time->Year = 1970;
114 		lyear = isleap(efi_time->Year);
115 		month = 13;
116 		seconds = CumulativeDays[lyear][month] * SECSPERDAY;
117 		while (time > seconds) {
118 			time -= seconds;
119 			efi_time->Year++;
120 			lyear = isleap(efi_time->Year);
121 			seconds = CumulativeDays[lyear][month] * SECSPERDAY;
122 		}
123 
124 		efi_time->Month = 0;
125 		while (time >
126 		    CumulativeDays[lyear][efi_time->Month] * SECSPERDAY) {
127 			efi_time->Month++;
128 		}
129 
130 		month = efi_time->Month - 1;
131 		time -= CumulativeDays[lyear][month] * SECSPERDAY;
132 
133 		for (efi_time->Day = 0; time > SECSPERDAY; efi_time->Day++)
134 			time -= SECSPERDAY;
135 
136 		for (efi_time->Hour = 0; time > SECSPERHOUR; efi_time->Hour++)
137 			time -= SECSPERHOUR;
138 
139 		for (efi_time->Minute = 0; time > 60; efi_time->Minute++)
140 			time -= 60;
141 
142 		efi_time->Second = time;
143 		efi_time->Nanosecond = 0;
144 		efi_time->TimeZone = 0;
145 		efi_time->Daylight = 0;
146 	} else {
147 		memset(efi_time, 0, sizeof (EFI_TIME));
148 	}
149 }
150 
151 time_t
from_efi_time(EFI_TIME * ETime)152 from_efi_time(EFI_TIME *ETime)
153 {
154 	time_t  UTime;
155 	int	Year;
156 
157 	/*
158 	 *  Do a santity check
159 	 */
160 	if (ETime->Year  <  1998 || ETime->Year   > 2099 ||
161 	    ETime->Month ==    0 || ETime->Month  >   12 ||
162 	    ETime->Day   ==    0 || ETime->Month  >   31 ||
163 	    ETime->Hour   >   23 || ETime->Minute >   59 ||
164 	    ETime->Second >   59 || ETime->TimeZone  < -1440 ||
165 	    (ETime->TimeZone >  1440 && ETime->TimeZone != 2047)) {
166 		return (0);
167 	}
168 
169 	/*
170 	 * Years
171 	 */
172 	UTime = 0;
173 	for (Year = 1970; Year != ETime->Year; ++Year) {
174 		UTime += (CumulativeDays[isleap(Year)][13] * SECSPERDAY);
175 	}
176 
177 	/*
178 	 * UTime should now be set to 00:00:00 on Jan 1 of the file's year.
179 	 *
180 	 * Months
181 	 */
182 	UTime += (CumulativeDays[isleap(ETime->Year)][ETime->Month] *
183 	    SECSPERDAY);
184 
185 	/*
186 	 * UTime should now be set to 00:00:00 on the first of the file's
187 	 * month and year.
188 	 *
189 	 * Days -- Don't count the file's day
190 	 */
191 	UTime += (((ETime->Day > 0) ? ETime->Day-1:0) * SECSPERDAY);
192 
193 	/*
194 	 * Hours
195 	 */
196 	UTime += (ETime->Hour * SECSPERHOUR);
197 
198 	/*
199 	 * Minutes
200 	 */
201 	UTime += (ETime->Minute * 60);
202 
203 	/*
204 	 * Seconds
205 	 */
206 	UTime += ETime->Second;
207 
208 	/*
209 	 * EFI time is repored in local time.  Adjust for any time zone
210 	 * offset to get true UT
211 	 */
212 	if (ETime->TimeZone != EFI_UNSPECIFIED_TIMEZONE) {
213 		/*
214 		 *  TimeZone is kept in minues...
215 		 */
216 		UTime += (ETime->TimeZone * 60);
217 	}
218 
219 	return (UTime);
220 }
221 
222 static int
EFI_GetTimeOfDay(OUT struct timeval * tp,OUT struct timezone * tzp)223 EFI_GetTimeOfDay(OUT struct timeval *tp, OUT struct timezone *tzp)
224 {
225 	EFI_TIME		EfiTime;
226 	EFI_TIME_CAPABILITIES	Capabilities;
227 	EFI_STATUS		Status;
228 
229 	/*
230 	 *  Get time from EFI
231 	 */
232 
233 	Status = RS->GetTime(&EfiTime, &Capabilities);
234 	if (EFI_ERROR(Status))
235 		return (-1);
236 
237 	/*
238 	 * Convert to UNIX time (ie seconds since the epoch)
239 	 */
240 
241 	tp->tv_sec  = from_efi_time(&EfiTime);
242 	tp->tv_usec = 0; /* EfiTime.Nanosecond * 1000; */
243 
244 	/*
245 	 * Do something with the timezone if needed
246 	 */
247 
248 	if (tzp != NULL) {
249 		if (EfiTime.TimeZone == EFI_UNSPECIFIED_TIMEZONE)
250 			tzp->tz_minuteswest = 0;
251 		else
252 			tzp->tz_minuteswest = EfiTime.TimeZone;
253 		/*
254 		 * This isn't quit right since it doesn't deal with
255 		 * EFI_TIME_IN_DAYLIGHT
256 		 */
257 		tzp->tz_dsttime =
258 			EfiTime.Daylight & EFI_TIME_ADJUST_DAYLIGHT ? 1 : 0;
259 	}
260 
261 	return (0);
262 }
263 
264 time_t
time(time_t * tloc)265 time(time_t *tloc)
266 {
267 	struct timeval tv;
268 
269 	memset(&tv, 0, sizeof (tv));
270 	EFI_GetTimeOfDay(&tv, NULL);
271 
272 	if (tloc)
273 		*tloc = tv.tv_sec;
274 	return (tv.tv_sec);
275 }
276 
277 time_t
getsecs(void)278 getsecs(void)
279 {
280 
281 	return (time(NULL));
282 }
283