1*30257Ssam /* clock.h 1.3 86/12/06 */ 224011Ssam 324011Ssam #define SECDAY ((unsigned)(24*60*60)) /* seconds per day */ 424011Ssam #define SECYR ((unsigned)(365*SECDAY)) /* per common year */ 524011Ssam 624011Ssam #define YRREF 1970 724011Ssam #define LEAPYEAR(year) ((year)%4==0) /* good till time becomes negative */ 824011Ssam 924011Ssam /* 1024011Ssam * Software clock is software interrupt level 8 1124011Ssam */ 1225678Ssam #define setsoftclock() mtpr(SIRR, 0x8) 13*30257Ssam 14*30257Ssam /* 15*30257Ssam * To calculate value for interval timer register, we 16*30257Ssam * use the fact that 20512 yields a 60hz clock. 17*30257Ssam */ 18*30257Ssam #define hztocount(v) ((20512*60) / (v)) 19