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Annotation of 43BSDTahoe/sys/vax/clock.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)clock.h     7.2 (Berkeley) 5/7/88
        !             7:  */
        !             8: 
        !             9: /*
        !            10:  * VAX clock registers
        !            11:  */
        !            12: 
        !            13: #define        ICCS_RUN        0x00000001
        !            14: #define        ICCS_TRANS      0x00000010
        !            15: #define        ICCS_SS         0x00000020
        !            16: #define        ICCS_IE         0x00000040
        !            17: #define        ICCS_INT        0x00000080
        !            18: #define        ICCS_ERR        0x80000000
        !            19:        
        !            20: #define        SECDAY          ((unsigned)(24*60*60))          /* seconds per day */
        !            21: #define        SECYR           ((unsigned)(365*SECDAY))        /* per common year */
        !            22: /*
        !            23:  * TODRZERO is the what the TODR should contain when the ``year'' begins.
        !            24:  * The TODR should always contain a number between 0 and SECYR+SECDAY.
        !            25:  */
        !            26: #define        TODRZERO        ((unsigned)(1<<28))
        !            27: 
        !            28: #define        YRREF           1970
        !            29: #define        LEAPYEAR(year)  ((year)%4==0)   /* good till time becomes negative */
        !            30: 
        !            31: /*
        !            32:  * Has the time-of-day clock wrapped around?
        !            33:  */
        !            34: #define        clkwrap()       (((unsigned)mfpr(TODR) - TODRZERO)/100 > SECYR+SECDAY)
        !            35: 
        !            36: /*
        !            37:  * Software clock is software interrupt level 8,
        !            38:  * implemented as mtpr(SIRR, 0x8) in asm.sed.
        !            39:  */
        !            40: 
        !            41: #ifndef LOCORE
        !            42: /*
        !            43:  * 8200s and 630s have a clock chip like those found in digital alarm
        !            44:  * clocks and watches.  Converting this to and from system times is
        !            45:  * painful, so we do it in only one place.  The routine chiptotime()
        !            46:  * converts a chiptime to the right value for time.tv_sec, and
        !            47:  * timetochip converts time.tv_sec back.
        !            48:  */
        !            49: struct chiptime {
        !            50:        int     sec;
        !            51:        int     min;
        !            52:        int     hour;
        !            53:        int     day;
        !            54:        int     mon;
        !            55:        int     year;
        !            56: };
        !            57: 
        !            58: /*
        !            59:  * Clock read routine return values.
        !            60:  */
        !            61: #define        CLKREAD_OK      0       /* success, time.tv_sec set */
        !            62: #define        CLKREAD_WARN    1       /* clock appears wrong but time set anyway */
        !            63: #define        CLKREAD_BAD     2       /* clock is bad, no time available */
        !            64: #endif

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