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Annotation of 43BSDTahoe/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 and use in source and binary forms are permitted
                      6:  * provided that the above copyright notice and this paragraph are
                      7:  * duplicated in all such forms and that any documentation,
                      8:  * advertising materials, and other materials related to such
                      9:  * distribution and use acknowledge that the software was developed
                     10:  * by the University of California, Berkeley.  The name of the
                     11:  * University may not be used to endorse or promote products derived
                     12:  * from this software without specific prior written permission.
                     13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     16:  *
                     17:  *     @(#)clock.c     7.2 (Berkeley) 6/29/88
                     18:  */
                     19: 
                     20: #include "param.h"
                     21: #include "time.h"
                     22: #include "kernel.h"
                     23: 
                     24: #include "pte.h"
                     25: #include "cpu.h"
                     26: #include "mtpr.h"
                     27: #include "clock.h"
                     28: #include "cp.h"
                     29: 
                     30: /*
                     31:  * Machine-dependent clock routines.
                     32:  *
                     33:  * Startrtclock restarts the real-time clock, which provides
                     34:  * hardclock interrupts to kern_clock.c.
                     35:  *
                     36:  * Inittodr initializes any time of day hardware which provides
                     37:  * date functions.  Its primary function is to use some file
                     38:  * system information in case the hardare clock lost state.
                     39:  */
                     40: 
                     41: /*
                     42:  * Start the real-time clock by initializing the
                     43:  * interval timer on the console processor card
                     44:  * according to hz.
                     45:  */
                     46: startrtclock()
                     47: {
                     48:        register int t;
                     49:        static struct cphdr cpclock;    /* must be in data space */
                     50:        
                     51:        cpclock.cp_unit = CPCLOCK;
                     52:        cpclock.cp_comm = CPWRITE;
                     53:        if (hz == 0) {
                     54:                extern int tickadj;             /* XXX */
                     55:                hz = 60;
                     56:                tick = 1000000 / hz;
                     57:                tickadj = 240000 / (60 * hz);
                     58:                printf("clock set to %dhz\n", hz);
                     59:        }
                     60:        cpclock.cp_count = hztocount(hz);
                     61:        if (cnlast) {
                     62:                /* try to insure last cmd was taken by cp */
                     63:                for (t = 30000; (cnlast->cp_unit&CPTAKE) == 0 && t > 0; t--)
                     64:                        uncache(&cnlast->cp_unit);
                     65:                cnlast = 0;
                     66:        }
                     67:        mtpr(CPMDCB, kvtophys(&cpclock));
                     68:        for (t = 30000; (cpclock.cp_unit&CPDONE) == 0 && t > 0; t--)
                     69:                uncache(&cpclock.cp_unit);
                     70: }
                     71: 
                     72: /*
                     73:  * Initialze the time of day register, based on
                     74:  * the time base which is, e.g. from a filesystem.
                     75:  */
                     76: inittodr(base)
                     77:        time_t base;
                     78: {
                     79: 
                     80:        if (base < 5*SECYR) {
                     81:                printf("WARNING: preposterous time in file system ");
                     82:                time.tv_sec = 6*SECYR + 186*SECDAY + SECDAY/2;
                     83:        } else
                     84:                time.tv_sec = base;
                     85:        printf("CHECK AND RESET THE DATE!\n");
                     86: }

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