1 /*- 2 * Copyright (c) 1988 University of Utah. 3 * Copyright (c) 1982, 1990, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * the Systems Programming Group of the University of Utah Computer 8 * Science Department. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from: Utah $Hdr: clock.c 1.18 91/01/21$ 35 * from: @(#)clock.c 8.2 (Berkeley) 1/12/94 36 * from: NetBSD: clock_subr.c,v 1.6 2001/07/07 17:04:02 thorpej Exp 37 * and 38 * from: src/sys/i386/isa/clock.c,v 1.176 2001/09/04 39 */ 40 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD$"); 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/bus.h> 48 #include <sys/clock.h> 49 #include <sys/sysctl.h> 50 #include <sys/timetc.h> 51 52 #define ct_debug bootverbose 53 static int adjkerntz; /* local offset from GMT in seconds */ 54 static int wall_cmos_clock; /* wall CMOS clock assumed if != 0 */ 55 int disable_rtc_set; /* disable resettodr() if != 0 */ 56 57 int tz_minuteswest; 58 int tz_dsttime; 59 60 /* 61 * These have traditionally been in machdep, but should probably be moved to 62 * kern. 63 */ 64 SYSCTL_INT(_machdep, OID_AUTO, disable_rtc_set, 65 CTLFLAG_RW, &disable_rtc_set, 0, ""); 66 67 SYSCTL_INT(_machdep, OID_AUTO, wall_cmos_clock, 68 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 69 70 static int 71 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS) 72 { 73 int error; 74 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 75 req); 76 if (!error && req->newptr) 77 resettodr(); 78 return (error); 79 } 80 81 SYSCTL_PROC(_machdep, OID_AUTO, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 82 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 83 84 /*--------------------------------------------------------------------* 85 * Generic routines to convert between a POSIX date 86 * (seconds since 1/1/1970) and yr/mo/day/hr/min/sec 87 * Derived from NetBSD arch/hp300/hp300/clock.c 88 */ 89 90 91 #define FEBRUARY 2 92 #define days_in_year(y) (leapyear(y) ? 366 : 365) 93 #define days_in_month(y, m) \ 94 (month_days[(m) - 1] + (m == FEBRUARY ? leapyear(y) : 0)) 95 /* Day of week. Days are counted from 1/1/1970, which was a Thursday */ 96 #define day_of_week(days) (((days) + 4) % 7) 97 98 static const int month_days[12] = { 99 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 100 }; 101 102 103 /* 104 * This inline avoids some unnecessary modulo operations 105 * as compared with the usual macro: 106 * ( ((year % 4) == 0 && 107 * (year % 100) != 0) || 108 * ((year % 400) == 0) ) 109 * It is otherwise equivalent. 110 */ 111 static int 112 leapyear(int year) 113 { 114 int rv = 0; 115 116 if ((year & 3) == 0) { 117 rv = 1; 118 if ((year % 100) == 0) { 119 rv = 0; 120 if ((year % 400) == 0) 121 rv = 1; 122 } 123 } 124 return (rv); 125 } 126 127 static void 128 print_ct(struct clocktime *ct) 129 { 130 printf("[%04d-%02d-%02d %02d:%02d:%02d]", 131 ct->year, ct->mon, ct->day, 132 ct->hour, ct->min, ct->sec); 133 } 134 135 int 136 clock_ct_to_ts(struct clocktime *ct, struct timespec *ts) 137 { 138 time_t secs; 139 int i, year, days; 140 141 year = ct->year; 142 143 if (ct_debug) { 144 printf("ct_to_ts("); 145 print_ct(ct); 146 printf(")"); 147 } 148 149 /* Sanity checks. */ 150 if (ct->mon < 1 || ct->mon > 12 || ct->day < 1 || 151 ct->day > days_in_month(year, ct->mon) || 152 ct->hour > 23 || ct->min > 59 || ct->sec > 59 || 153 ct->year > 2037) { /* time_t overflow */ 154 if (ct_debug) 155 printf(" = EINVAL\n"); 156 return (EINVAL); 157 } 158 159 /* 160 * Compute days since start of time 161 * First from years, then from months. 162 */ 163 days = 0; 164 for (i = POSIX_BASE_YEAR; i < year; i++) 165 days += days_in_year(i); 166 167 /* Months */ 168 for (i = 1; i < ct->mon; i++) 169 days += days_in_month(year, i); 170 days += (ct->day - 1); 171 172 /* XXX Dow sanity check. Dow is not used, so should we check it? */ 173 if (ct->dow != -1 && ct->dow != day_of_week(days)) 174 return (EINVAL); 175 176 /* Add hours, minutes, seconds. */ 177 secs = ((days * 24 + ct->hour) * 60 + ct->min) * 60 + ct->sec; 178 179 ts->tv_sec = secs; 180 ts->tv_nsec = ct->nsec; 181 if (ct_debug) 182 printf(" = %ld.%09ld\n", (long)ts->tv_sec, (long)ts->tv_nsec); 183 return (0); 184 } 185 186 void 187 clock_ts_to_ct(struct timespec *ts, struct clocktime *ct) 188 { 189 int i, year, days; 190 time_t rsec; /* remainder seconds */ 191 time_t secs; 192 193 secs = ts->tv_sec; 194 days = secs / SECDAY; 195 rsec = secs % SECDAY; 196 197 ct->dow = day_of_week(days); 198 199 /* Subtract out whole years, counting them in i. */ 200 for (year = POSIX_BASE_YEAR; days >= days_in_year(year); year++) 201 days -= days_in_year(year); 202 ct->year = year; 203 204 /* Subtract out whole months, counting them in i. */ 205 for (i = 1; days >= days_in_month(year, i); i++) 206 days -= days_in_month(year, i); 207 ct->mon = i; 208 209 /* Days are what is left over (+1) from all that. */ 210 ct->day = days + 1; 211 212 /* Hours, minutes, seconds are easy */ 213 ct->hour = rsec / 3600; 214 rsec = rsec % 3600; 215 ct->min = rsec / 60; 216 rsec = rsec % 60; 217 ct->sec = rsec; 218 ct->nsec = ts->tv_nsec; 219 if (ct_debug) { 220 printf("ts_to_ct(%ld.%09ld) = ", 221 (long)ts->tv_sec, (long)ts->tv_nsec); 222 print_ct(ct); 223 printf("\n"); 224 } 225 } 226 227 int 228 utc_offset(void) 229 { 230 231 return (tz_minuteswest * 60 + (wall_cmos_clock ? adjkerntz : 0)); 232 } 233