1 /* 2 * Copyright (c) 1988 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)clock.c 7.4 (Berkeley) 12/16/90 8 */ 9 10 #include "sys/param.h" 11 #include "sys/time.h" 12 #include "sys/kernel.h" 13 14 #include "../include/pte.h" 15 #include "../include/cpu.h" 16 #include "../include/mtpr.h" 17 #include "../include/clock.h" 18 #include "cp.h" 19 20 /* 21 * Machine-dependent clock routines. 22 * 23 * Startrtclock restarts the real-time clock, which provides 24 * hardclock interrupts to kern_clock.c. 25 * 26 * Inittodr initializes any time of day hardware which provides 27 * date functions. Its primary function is to use some file 28 * system information in case the hardare clock lost state. 29 */ 30 31 /* 32 * Start the real-time clock by initializing the 33 * interval timer on the console processor card 34 * according to hz. 35 */ 36 startrtclock() 37 { 38 register int t; 39 static struct cphdr cpclock; /* must be in data space */ 40 41 cpclock.cp_unit = CPCLOCK; 42 cpclock.cp_comm = CPWRITE; 43 if (hz == 0) { 44 extern int tickadj; /* XXX */ 45 hz = 60; 46 tick = 1000000 / hz; 47 tickadj = 240000 / (60 * hz); 48 printf("clock set to %dhz\n", hz); 49 } 50 cpclock.cp_count = hztocount(hz); 51 if (cnlast) { 52 /* try to insure last cmd was taken by cp */ 53 for (t = 30000; (cnlast->cp_unit&CPTAKE) == 0 && t > 0; t--) 54 uncache(&cnlast->cp_unit); 55 cnlast = 0; 56 } 57 mtpr(CPMDCB, kvtophys(&cpclock)); 58 for (t = 30000; (cpclock.cp_unit&CPDONE) == 0 && t > 0; t--) 59 uncache(&cpclock.cp_unit); 60 } 61 62 /* 63 * Initialze the time of day register, based on 64 * the time base which is, e.g. from a filesystem. 65 */ 66 inittodr(base) 67 time_t base; 68 { 69 70 if (base < 5*SECYR) { 71 printf("WARNING: preposterous time in file system "); 72 time.tv_sec = 6*SECYR + 186*SECDAY + SECDAY/2; 73 } else 74 time.tv_sec = base; 75 printf("CHECK AND RESET THE DATE!\n"); 76 } 77