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