/* * Copyright (c) 1988 Regents of the University of California. * All rights reserved. * * 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. * * @(#)clock.c 7.4 (Berkeley) 12/16/90 */ #include "sys/param.h" #include "sys/time.h" #include "sys/kernel.h" #include "../include/pte.h" #include "../include/cpu.h" #include "../include/mtpr.h" #include "../include/clock.h" #include "cp.h" /* * Machine-dependent clock routines. * * Startrtclock restarts the real-time clock, which provides * hardclock interrupts to kern_clock.c. * * Inittodr initializes any time of day hardware which provides * date functions. Its primary function is to use some file * system information in case the hardare clock lost state. */ /* * Start the real-time clock by initializing the * interval timer on the console processor card * according to hz. */ startrtclock() { register int t; static struct cphdr cpclock; /* must be in data space */ cpclock.cp_unit = CPCLOCK; cpclock.cp_comm = CPWRITE; if (hz == 0) { extern int tickadj; /* XXX */ hz = 60; tick = 1000000 / hz; tickadj = 240000 / (60 * hz); printf("clock set to %dhz\n", hz); } cpclock.cp_count = hztocount(hz); if (cnlast) { /* try to insure last cmd was taken by cp */ for (t = 30000; (cnlast->cp_unit&CPTAKE) == 0 && t > 0; t--) uncache(&cnlast->cp_unit); cnlast = 0; } mtpr(CPMDCB, kvtophys(&cpclock)); for (t = 30000; (cpclock.cp_unit&CPDONE) == 0 && t > 0; t--) uncache(&cpclock.cp_unit); } /* * Initialze the time of day register, based on * the time base which is, e.g. from a filesystem. */ inittodr(base) time_t base; { if (base < 5*SECYR) { printf("WARNING: preposterous time in file system "); time.tv_sec = 6*SECYR + 186*SECDAY + SECDAY/2; } else time.tv_sec = base; printf("CHECK AND RESET THE DATE!\n"); }