/* * Copyright (c) 1988 University of Utah. * Copyright (c) 1982, 1990, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: Utah $Hdr: clock.c 1.18 91/01/21$ * from: @(#)clock.c 8.2 (Berkeley) 1/12/94 * from: NetBSD: clock_subr.c,v 1.6 2001/07/07 17:04:02 thorpej Exp * and * from: src/sys/i386/isa/clock.c,v 1.176 2001/09/04 */ /* * Helpers for time-of-day clocks. This is useful for architectures that need * support multiple models of such clocks, and generally serves to make the * code more machine-independent. * If the clock in question can also be used as a time counter, the driver * needs to initiate this. * This code is not yet used by all architectures. */ /* * Generic routines to convert between a POSIX date * (seconds since 1/1/1970) and yr/mo/day/hr/min/sec * Derived from NetBSD arch/hp300/hp300/clock.c */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include /* XXX: for the CPU_* sysctl OID constants. */ #include #include "clock_if.h" static __inline int leapyear(int year); static int sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS); #define FEBRUARY 2 #define days_in_year(y) (leapyear(y) ? 366 : 365) #define days_in_month(y, m) \ (month_days[(m) - 1] + (m == FEBRUARY ? leapyear(y) : 0)) /* Day of week. Days are counted from 1/1/1970, which was a Thursday */ #define day_of_week(days) (((days) + 4) % 7) static const int month_days[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; static device_t clock_dev = NULL; static long clock_res; int adjkerntz; /* local offset from GMT in seconds */ int disable_rtc_set; /* disable resettodr() if != 0 */ int wall_cmos_clock; /* wall CMOS clock assumed if != 0 */ /* * These have traditionally been in machdep, but should probably be moved to * kern. */ SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, CTLFLAG_RW, &disable_rtc_set, 0, ""); SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, CTLFLAG_RW, &wall_cmos_clock, 0, ""); static int sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS) { int error; error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req); if (!error && req->newptr) resettodr(); return (error); } /* * This inline avoids some unnecessary modulo operations * as compared with the usual macro: * ( ((year % 4) == 0 && * (year % 100) != 0) || * ((year % 400) == 0) ) * It is otherwise equivalent. */ static __inline int leapyear(int year) { int rv = 0; if ((year & 3) == 0) { rv = 1; if ((year % 100) == 0) { rv = 0; if ((year % 400) == 0) rv = 1; } } return (rv); } int clock_ct_to_ts(struct clocktime *ct, struct timespec *ts) { time_t secs; int i, year, days; year = ct->year; /* Sanity checks. */ if (ct->mon < 1 || ct->mon > 12 || ct->day < 1 || ct->day > days_in_month(year, ct->mon) || ct->hour > 23 || ct->min > 59 || ct->sec > 59 || ct->year > 2037) /* time_t overflow */ return (EINVAL); /* * Compute days since start of time * First from years, then from months. */ days = 0; for (i = POSIX_BASE_YEAR; i < year; i++) days += days_in_year(i); /* Months */ for (i = 1; i < ct->mon; i++) days += days_in_month(year, i); days += (ct->day - 1); /* Another sanity check. */ if (ct->dow != -1 && ct->dow != day_of_week(days)) return (EINVAL); /* Add hours, minutes, seconds. */ secs = ((days * 24 + ct->hour) * 60 + ct->min) * 60 + ct->sec; ts->tv_sec = secs; ts->tv_nsec = ct->nsec; return (0); } void clock_ts_to_ct(struct timespec *ts, struct clocktime *ct) { int i, year, days; time_t rsec; /* remainder seconds */ time_t secs; secs = ts->tv_sec; days = secs / SECDAY; rsec = secs % SECDAY; ct->dow = day_of_week(days); /* Subtract out whole years, counting them in i. */ for (year = POSIX_BASE_YEAR; days >= days_in_year(year); year++) days -= days_in_year(year); ct->year = year; /* Subtract out whole months, counting them in i. */ for (i = 1; days >= days_in_month(year, i); i++) days -= days_in_month(year, i); ct->mon = i; /* Days are what is left over (+1) from all that. */ ct->day = days + 1; /* Hours, minutes, seconds are easy */ ct->hour = rsec / 3600; rsec = rsec % 3600; ct->min = rsec / 60; rsec = rsec % 60; ct->sec = rsec; ct->nsec = ts->tv_nsec; } void clock_register(device_t dev, long res) { if (clock_dev != NULL) { if (clock_res > res) { if (bootverbose) { device_printf(dev, "not installed as " "time-of-day clock: clock %s has higher " "resolution\n", device_get_name(clock_dev)); } return; } else { if (bootverbose) { device_printf(clock_dev, "removed as " "time-of-day clock: clock %s has higher " "resolution\n", device_get_name(dev)); } } } clock_dev = dev; clock_res = res; if (bootverbose) { device_printf(dev, "registered as a time-of-day clock " "(resolution %ldus)\n", res); } } /* * inittodr and settodr derived from the i386 versions written * by Christoph Robitschko , reintroduced and * updated by Chris Stenton 8/10/94 */ /* * Initialize the time of day register, based on the time base which is, e.g. * from a filesystem. */ void inittodr(time_t base) { struct timespec diff, ref, ts; int error; if (base) { ref.tv_sec = base; ref.tv_nsec = 0; tc_setclock(&ref); } if (clock_dev == NULL) { printf("warning: no time-of-day clock registered, system time " "will not be set accurately\n"); return; } error = CLOCK_GETTIME(clock_dev, &ts); if (error != 0 && error != EINVAL) { printf("warning: clock_gettime failed (%d), the system time " "will not be set accurately\n", error); return; } if (error == EINVAL || ts.tv_sec < 0) { printf("Invalid time in real time clock.\n"); printf("Check and reset the date immediately!\n"); } ts.tv_sec += tz_minuteswest * 60 + (wall_cmos_clock ? adjkerntz : 0); if (timespeccmp(&ref, &ts, >)) { diff = ref; timespecsub(&ref, &ts); } else { diff = ts; timespecsub(&diff, &ref); } if (ts.tv_sec >= 2) { /* badly off, adjust it */ tc_setclock(&ts); } } /* * Write system time back to RTC */ void resettodr() { struct timespec ts; int error; if (disable_rtc_set || clock_dev == NULL) return; getnanotime(&ts); ts.tv_sec -= tz_minuteswest * 60 + (wall_cmos_clock ? adjkerntz : 0); if ((error = CLOCK_SETTIME(clock_dev, &ts)) != 0) { printf("warning: clock_settime failed (%d), time-of-day clock " "not adjusted to system time\n", error); return; } }