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 56 int tz_minuteswest; 57 int tz_dsttime; 58 59 /* 60 * This have traditionally been in machdep, but should probably be moved to 61 * kern. 62 */ 63 SYSCTL_INT(_machdep, OID_AUTO, wall_cmos_clock, 64 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 65 66 static int 67 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS) 68 { 69 int error; 70 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req); 71 if (!error && req->newptr) 72 resettodr(); 73 return (error); 74 } 75 76 SYSCTL_PROC(_machdep, OID_AUTO, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 77 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 78 79 /*--------------------------------------------------------------------* 80 * Generic routines to convert between a POSIX date 81 * (seconds since 1/1/1970) and yr/mo/day/hr/min/sec 82 * Derived from NetBSD arch/hp300/hp300/clock.c 83 */ 84 85 86 #define FEBRUARY 2 87 #define days_in_year(y) (leapyear(y) ? 366 : 365) 88 #define days_in_month(y, m) \ 89 (month_days[(m) - 1] + (m == FEBRUARY ? leapyear(y) : 0)) 90 /* Day of week. Days are counted from 1/1/1970, which was a Thursday */ 91 #define day_of_week(days) (((days) + 4) % 7) 92 93 static const int month_days[12] = { 94 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 95 }; 96 97 98 /* 99 * This inline avoids some unnecessary modulo operations 100 * as compared with the usual macro: 101 * ( ((year % 4) == 0 && 102 * (year % 100) != 0) || 103 * ((year % 400) == 0) ) 104 * It is otherwise equivalent. 105 */ 106 static int 107 leapyear(int year) 108 { 109 int rv = 0; 110 111 if ((year & 3) == 0) { 112 rv = 1; 113 if ((year % 100) == 0) { 114 rv = 0; 115 if ((year % 400) == 0) 116 rv = 1; 117 } 118 } 119 return (rv); 120 } 121 122 static void 123 print_ct(struct clocktime *ct) 124 { 125 printf("[%04d-%02d-%02d %02d:%02d:%02d]", 126 ct->year, ct->mon, ct->day, 127 ct->hour, ct->min, ct->sec); 128 } 129 130 int 131 clock_ct_to_ts(struct clocktime *ct, struct timespec *ts) 132 { 133 time_t secs; 134 int i, year, days; 135 136 year = ct->year; 137 138 if (ct_debug) { 139 printf("ct_to_ts("); 140 print_ct(ct); 141 printf(")"); 142 } 143 144 /* Sanity checks. */ 145 if (ct->mon < 1 || ct->mon > 12 || ct->day < 1 || 146 ct->day > days_in_month(year, ct->mon) || 147 ct->hour > 23 || ct->min > 59 || ct->sec > 59 || 148 ct->year > 2037) { /* time_t overflow */ 149 if (ct_debug) 150 printf(" = EINVAL\n"); 151 return (EINVAL); 152 } 153 154 /* 155 * Compute days since start of time 156 * First from years, then from months. 157 */ 158 days = 0; 159 for (i = POSIX_BASE_YEAR; i < year; i++) 160 days += days_in_year(i); 161 162 /* Months */ 163 for (i = 1; i < ct->mon; i++) 164 days += days_in_month(year, i); 165 days += (ct->day - 1); 166 167 /* XXX Dow sanity check. Dow is not used, so should we check it? */ 168 if (ct->dow != -1 && ct->dow != day_of_week(days)) 169 return (EINVAL); 170 171 /* Add hours, minutes, seconds. */ 172 secs = ((days * 24 + ct->hour) * 60 + ct->min) * 60 + ct->sec; 173 174 ts->tv_sec = secs; 175 ts->tv_nsec = ct->nsec; 176 if (ct_debug) 177 printf(" = %ld.%09ld\n", (long)ts->tv_sec, (long)ts->tv_nsec); 178 return (0); 179 } 180 181 void 182 clock_ts_to_ct(struct timespec *ts, struct clocktime *ct) 183 { 184 int i, year, days; 185 time_t rsec; /* remainder seconds */ 186 time_t secs; 187 188 secs = ts->tv_sec; 189 days = secs / SECDAY; 190 rsec = secs % SECDAY; 191 192 ct->dow = day_of_week(days); 193 194 /* Subtract out whole years, counting them in i. */ 195 for (year = POSIX_BASE_YEAR; days >= days_in_year(year); year++) 196 days -= days_in_year(year); 197 ct->year = year; 198 199 /* Subtract out whole months, counting them in i. */ 200 for (i = 1; days >= days_in_month(year, i); i++) 201 days -= days_in_month(year, i); 202 ct->mon = i; 203 204 /* Days are what is left over (+1) from all that. */ 205 ct->day = days + 1; 206 207 /* Hours, minutes, seconds are easy */ 208 ct->hour = rsec / 3600; 209 rsec = rsec % 3600; 210 ct->min = rsec / 60; 211 rsec = rsec % 60; 212 ct->sec = rsec; 213 ct->nsec = ts->tv_nsec; 214 if (ct_debug) { 215 printf("ts_to_ct(%ld.%09ld) = ", 216 (long)ts->tv_sec, (long)ts->tv_nsec); 217 print_ct(ct); 218 printf("\n"); 219 } 220 } 221 222 int 223 utc_offset(void) 224 { 225 226 return (tz_minuteswest * 60 + (wall_cmos_clock ? adjkerntz : 0)); 227 } 228