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Annotation of 43BSDTahoe/sys/tahoe/clock.h, 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.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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