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Annotation of 43BSDTahoe/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 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.h     7.2 (Berkeley) 6/29/88
        !            18:  */
        !            19: 
        !            20: #define        SECDAY          ((unsigned)(24*60*60))          /* seconds per day */
        !            21: #define        SECYR           ((unsigned)(365*SECDAY))        /* per common year */
        !            22: 
        !            23: #define        YRREF           1970
        !            24: #define        LEAPYEAR(year)  ((year)%4==0)   /* good till time becomes negative */
        !            25: 
        !            26: /*
        !            27:  * Software clock is software interrupt level 8
        !            28:  */
        !            29: #define        setsoftclock()  mtpr(SIRR, 0x8)
        !            30: 
        !            31: /*
        !            32:  * To calculate value for interval timer register, we
        !            33:  * use the fact that 20512 yields a 60hz clock.
        !            34:  */
        !            35: #define        hztocount(v)    ((20512*60) / (v))

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