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Annotation of 43BSDTahoe/sys/tahoe/clock.c, revision 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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