/* $NetBSD: kern_todr.c,v 1.39 2015/04/13 16:36:54 riastradh Exp $ */ /* * Copyright (c) 1988 University of Utah. * Copyright (c) 1992, 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 and Ralph Campbell. * * 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. 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 * * @(#)clock.c 8.1 (Berkeley) 6/10/93 */ #include "opt_todr.h" #include __KERNEL_RCSID(0, "$NetBSD: kern_todr.c,v 1.39 2015/04/13 16:36:54 riastradh Exp $"); #include #include #include #include #include #include #include #include /* hmm.. this should probably move to sys */ static todr_chip_handle_t todr_handle = NULL; /* * Attach the clock device to todr_handle. */ void todr_attach(todr_chip_handle_t todr) { if (todr_handle) { printf("todr_attach: TOD already configured\n"); return; } todr_handle = todr; } static bool timeset = false; /* * Set up the system's time, given a `reasonable' time value. */ void inittodr(time_t base) { bool badbase = false; bool waszero = (base == 0); bool goodtime = false; bool badrtc = false; int s; struct timespec ts; struct timeval tv; rnd_add_data(NULL, &base, sizeof(base), 0); if (base < 5 * SECS_PER_COMMON_YEAR) { struct clock_ymdhms basedate; /* * If base is 0, assume filesystem time is just unknown * instead of preposterous. Don't bark. */ if (base != 0) printf("WARNING: preposterous time in file system\n"); /* not going to use it anyway, if the chip is readable */ basedate.dt_year = 2010; basedate.dt_mon = 1; basedate.dt_day = 1; basedate.dt_hour = 12; basedate.dt_min = 0; basedate.dt_sec = 0; base = clock_ymdhms_to_secs(&basedate); badbase = true; } /* * Some ports need to be supplied base in order to fabricate a time_t. */ if (todr_handle) todr_handle->base_time = base; if ((todr_handle == NULL) || (todr_gettime(todr_handle, &tv) != 0) || (tv.tv_sec < (25 * SECS_PER_COMMON_YEAR))) { if (todr_handle != NULL) printf("WARNING: preposterous TOD clock time\n"); else printf("WARNING: no TOD clock present\n"); badrtc = true; } else { time_t deltat = tv.tv_sec - base; if (deltat < 0) deltat = -deltat; if (!badbase && deltat >= 2 * SECS_PER_DAY) { if (tv.tv_sec < base) { /* * The clock should never go backwards * relative to filesystem time. If it * does by more than the threshold, * believe the filesystem. */ printf("WARNING: clock lost %" PRId64 " days\n", deltat / SECS_PER_DAY); badrtc = true; } else { aprint_verbose("WARNING: clock gained %" PRId64 " days\n", deltat / SECS_PER_DAY); goodtime = true; } } else { goodtime = true; } rnd_add_data(NULL, &tv, sizeof(tv), 0); } /* if the rtc time is bad, use the filesystem time */ if (badrtc) { if (badbase) { printf("WARNING: using default initial time\n"); } else { printf("WARNING: using filesystem time\n"); } tv.tv_sec = base; tv.tv_usec = 0; } timeset = true; ts.tv_sec = tv.tv_sec; ts.tv_nsec = tv.tv_usec * 1000; s = splclock(); tc_setclock(&ts); splx(s); if (waszero || goodtime) return; printf("WARNING: CHECK AND RESET THE DATE!\n"); } /* * Reset the TODR based on the time value; used when the TODR * has a preposterous value and also when the time is reset * by the stime system call. Also called when the TODR goes past * TODRZERO + 100*(SECS_PER_COMMON_YEAR+2*SECS_PER_DAY) * (e.g. on Jan 2 just after midnight) to wrap the TODR around. */ void resettodr(void) { struct timeval tv; /* * We might have been called by boot() due to a crash early * on. Don't reset the clock chip if we don't know what time * it is. */ if (!timeset) return; getmicrotime(&tv); if (tv.tv_sec == 0) return; if (todr_handle) if (todr_settime(todr_handle, &tv) != 0) printf("Cannot set TOD clock time\n"); } #ifdef TODR_DEBUG static void todr_debug(const char *prefix, int rv, struct clock_ymdhms *dt, struct timeval *tvp) { struct timeval tv_val; struct clock_ymdhms dt_val; if (dt == NULL) { clock_secs_to_ymdhms(tvp->tv_sec, &dt_val); dt = &dt_val; } if (tvp == NULL) { tvp = &tv_val; tvp->tv_sec = clock_ymdhms_to_secs(dt); tvp->tv_usec = 0; } printf("%s: rv = %d\n", prefix, rv); printf("%s: rtc_offset = %d\n", prefix, rtc_offset); printf("%s: %4u/%02u/%02u %02u:%02u:%02u, (wday %d) (epoch %u.%06u)\n", prefix, (unsigned)dt->dt_year, dt->dt_mon, dt->dt_day, dt->dt_hour, dt->dt_min, dt->dt_sec, dt->dt_wday, (unsigned)tvp->tv_sec, (unsigned)tvp->tv_usec); } #else /* !TODR_DEBUG */ #define todr_debug(prefix, rv, dt, tvp) #endif /* TODR_DEBUG */ int todr_gettime(todr_chip_handle_t tch, struct timeval *tvp) { struct clock_ymdhms dt; int rv; if (tch->todr_gettime) { rv = tch->todr_gettime(tch, tvp); /* * Some unconverted ports have their own references to * rtc_offset. A converted port must not do that. */ if (rv == 0) tvp->tv_sec += rtc_offset * 60; todr_debug("TODR-GET-SECS", rv, NULL, tvp); return rv; } else if (tch->todr_gettime_ymdhms) { rv = tch->todr_gettime_ymdhms(tch, &dt); todr_debug("TODR-GET-YMDHMS", rv, &dt, NULL); if (rv) return rv; /* * Simple sanity checks. Note that this includes a * value for clocks that can return a leap second. * Note that we don't support double leap seconds, * since this was apparently an error/misunderstanding * on the part of the ISO C committee, and can never * actually occur. If your clock issues us a double * leap second, it must be broken. Ultimately, you'd * have to be trying to read time at precisely that * instant to even notice, so even broken clocks will * work the vast majority of the time. In such a case * it is recommended correction be applied in the * clock driver. */ if (dt.dt_mon < 1 || dt.dt_mon > 12 || dt.dt_day < 1 || dt.dt_day > 31 || dt.dt_hour > 23 || dt.dt_min > 59 || dt.dt_sec > 60) { return EINVAL; } tvp->tv_sec = clock_ymdhms_to_secs(&dt) + rtc_offset * 60; tvp->tv_usec = 0; return tvp->tv_sec < 0 ? EINVAL : 0; } return ENXIO; } int todr_settime(todr_chip_handle_t tch, struct timeval *tvp) { struct clock_ymdhms dt; int rv; if (tch->todr_settime) { /* See comments above in gettime why this is ifdef'd */ struct timeval copy = *tvp; copy.tv_sec -= rtc_offset * 60; rv = tch->todr_settime(tch, ©); todr_debug("TODR-SET-SECS", rv, NULL, tvp); return rv; } else if (tch->todr_settime_ymdhms) { time_t sec = tvp->tv_sec - rtc_offset * 60; if (tvp->tv_usec >= 500000) sec++; clock_secs_to_ymdhms(sec, &dt); rv = tch->todr_settime_ymdhms(tch, &dt); todr_debug("TODR-SET-YMDHMS", rv, &dt, NULL); return rv; } else { return ENXIO; } }