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Annotation of 41BSD/sys/h/clock.h, revision 1.1.1.1

1.1       root        1: /*     clock.h 4.1     11/9/80 */
                      2: 
                      3: /*
                      4:  * VAX clock registers
                      5:  */
                      6: 
                      7: #define        ICCS_RUN        0x1
                      8: #define        ICCS_TRANS      0x10
                      9: #define        ICCS_SS         0x20
                     10: #define        ICCS_IE         0x40
                     11: #define        ICCS_INT        0x80
                     12: #define        ICCS_ERR        0x80000000
                     13:        
                     14: #define        SECDAY          ((unsigned)(24*60*60))          /* seconds per day */
                     15: #define        SECYR           ((unsigned)(365*SECDAY))        /* per common year */
                     16: /*
                     17:  * TODRZERO is the what the TODR should contain when the ``year'' begins.
                     18:  * The TODR should always contain a number between 0 and SECYR+SECDAY.
                     19:  */
                     20: #define        TODRZERO        ((unsigned)(1<<28))
                     21: 
                     22: #define        YRREF           1970
                     23: #define        LEAPYEAR(year)  ((year)%4==0 && year != 2000)   /* good till 2100 */
                     24: 
                     25: /*
                     26:  * Start a 60 HZ clock.
                     27:  */
                     28: #define        clkstart() {\
                     29:        mtpr(NICR, -16667);     /* 16.667 milli-seconds */\
                     30:        mtpr(ICCS, ICCS_RUN+ICCS_IE+ICCS_TRANS+ICCS_INT+ICCS_ERR);\
                     31: }
                     32: #define        clkreld()       mtpr(ICCS, ICCS_RUN+ICCS_IE+ICCS_INT+ICCS_ERR)
                     33: 
                     34: #define        clkwrap()       (((unsigned)mfpr(TODR) - TODRZERO)/100 > SECYR+SECDAY)

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