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Annotation of 43BSDReno/sys/tahoe/clock.h, 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.h     7.3 (Berkeley) 6/28/90
        !            21:  */
        !            22: 
        !            23: #define        SECDAY          ((unsigned)(24*60*60))          /* seconds per day */
        !            24: #define        SECYR           ((unsigned)(365*SECDAY))        /* per common year */
        !            25: 
        !            26: #define        YRREF           1970
        !            27: #define        LEAPYEAR(year)  ((year)%4==0)   /* good till time becomes negative */
        !            28: 
        !            29: /*
        !            30:  * Software clock is software interrupt level 8
        !            31:  */
        !            32: #define        setsoftclock()  mtpr(SIRR, 0x8)
        !            33: 
        !            34: /*
        !            35:  * To calculate value for interval timer register, we
        !            36:  * use the fact that 20512 yields a 60hz clock.
        !            37:  */
        !            38: #define        hztocount(v)    ((20512*60) / (v))

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