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Annotation of 43BSDReno/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 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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