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Annotation of 43BSDReno/sys/tahoe/clock.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1988 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution is only permitted until one year after the first shipment
                      6:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
                      7:  * binary forms are permitted provided that: (1) source distributions retain
                      8:  * this entire copyright notice and comment, and (2) distributions including
                      9:  * binaries display the following acknowledgement:  This product includes
                     10:  * software developed by the University of California, Berkeley and its
                     11:  * contributors'' in the documentation or other materials provided with the
                     12:  * distribution and in all advertising materials mentioning features or use
                     13:  * of this software.  Neither the name of the University nor the names of
                     14:  * its contributors may be used to endorse or promote products derived from
                     15:  * this software without specific prior written permission.
                     16:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
                     17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
                     18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     19:  *
                     20:  *     @(#)clock.c     7.3 (Berkeley) 6/28/90
                     21:  */
                     22: 
                     23: #include "param.h"
                     24: #include "time.h"
                     25: #include "kernel.h"
                     26: 
                     27: #include "pte.h"
                     28: #include "cpu.h"
                     29: #include "mtpr.h"
                     30: #include "clock.h"
                     31: #include "cp.h"
                     32: 
                     33: /*
                     34:  * Machine-dependent clock routines.
                     35:  *
                     36:  * Startrtclock restarts the real-time clock, which provides
                     37:  * hardclock interrupts to kern_clock.c.
                     38:  *
                     39:  * Inittodr initializes any time of day hardware which provides
                     40:  * date functions.  Its primary function is to use some file
                     41:  * system information in case the hardare clock lost state.
                     42:  */
                     43: 
                     44: /*
                     45:  * Start the real-time clock by initializing the
                     46:  * interval timer on the console processor card
                     47:  * according to hz.
                     48:  */
                     49: startrtclock()
                     50: {
                     51:        register int t;
                     52:        static struct cphdr cpclock;    /* must be in data space */
                     53:        
                     54:        cpclock.cp_unit = CPCLOCK;
                     55:        cpclock.cp_comm = CPWRITE;
                     56:        if (hz == 0) {
                     57:                extern int tickadj;             /* XXX */
                     58:                hz = 60;
                     59:                tick = 1000000 / hz;
                     60:                tickadj = 240000 / (60 * hz);
                     61:                printf("clock set to %dhz\n", hz);
                     62:        }
                     63:        cpclock.cp_count = hztocount(hz);
                     64:        if (cnlast) {
                     65:                /* try to insure last cmd was taken by cp */
                     66:                for (t = 30000; (cnlast->cp_unit&CPTAKE) == 0 && t > 0; t--)
                     67:                        uncache(&cnlast->cp_unit);
                     68:                cnlast = 0;
                     69:        }
                     70:        mtpr(CPMDCB, kvtophys(&cpclock));
                     71:        for (t = 30000; (cpclock.cp_unit&CPDONE) == 0 && t > 0; t--)
                     72:                uncache(&cpclock.cp_unit);
                     73: }
                     74: 
                     75: /*
                     76:  * Initialze the time of day register, based on
                     77:  * the time base which is, e.g. from a filesystem.
                     78:  */
                     79: inittodr(base)
                     80:        time_t base;
                     81: {
                     82: 
                     83:        if (base < 5*SECYR) {
                     84:                printf("WARNING: preposterous time in file system ");
                     85:                time.tv_sec = 6*SECYR + 186*SECDAY + SECDAY/2;
                     86:        } else
                     87:                time.tv_sec = base;
                     88:        printf("CHECK AND RESET THE DATE!\n");
                     89: }

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