1*34407Skarels /* 2*34407Skarels * Copyright (c) 1988 Regents of the University of California. 3*34407Skarels * All rights reserved. 4*34407Skarels * 5*34407Skarels * Redistribution and use in source and binary forms are permitted 6*34407Skarels * provided that this notice is preserved and that due credit is given 7*34407Skarels * to the University of California at Berkeley. The name of the University 8*34407Skarels * may not be used to endorse or promote products derived from this 9*34407Skarels * software without specific prior written permission. This software 10*34407Skarels * is provided ``as is'' without express or implied warranty. 11*34407Skarels * 12*34407Skarels * @(#)clock.h 7.1 (Berkeley) 05/21/88 13*34407Skarels */ 1424011Ssam 1524011Ssam #define SECDAY ((unsigned)(24*60*60)) /* seconds per day */ 1624011Ssam #define SECYR ((unsigned)(365*SECDAY)) /* per common year */ 1724011Ssam 1824011Ssam #define YRREF 1970 1924011Ssam #define LEAPYEAR(year) ((year)%4==0) /* good till time becomes negative */ 2024011Ssam 2124011Ssam /* 2224011Ssam * Software clock is software interrupt level 8 2324011Ssam */ 2425678Ssam #define setsoftclock() mtpr(SIRR, 0x8) 2530257Ssam 2630257Ssam /* 2730257Ssam * To calculate value for interval timer register, we 2830257Ssam * use the fact that 20512 yields a 60hz clock. 2930257Ssam */ 3030257Ssam #define hztocount(v) ((20512*60) / (v)) 31