.ref-BSD-4_3_Tahoe/usr/src/sys/vax/clock.h

/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *      @(#)clock.h     7.2 (Berkeley) 5/7/88
 */

/*
 * VAX clock registers
 */

#define ICCS_RUN        0x00000001
#define ICCS_TRANS      0x00000010
#define ICCS_SS         0x00000020
#define ICCS_IE         0x00000040
#define ICCS_INT        0x00000080
#define ICCS_ERR        0x80000000

#define SECDAY          ((unsigned)(24*60*60))          /* seconds per day */
#define SECYR           ((unsigned)(365*SECDAY))        /* per common year */
/*
 * TODRZERO is the what the TODR should contain when the ``year'' begins.
 * The TODR should always contain a number between 0 and SECYR+SECDAY.
 */
#define TODRZERO        ((unsigned)(1<<28))

#define YRREF           1970
#define LEAPYEAR(year)  ((year)%4==0)   /* good till time becomes negative */

/*
 * Has the time-of-day clock wrapped around?
 */
#define clkwrap()       (((unsigned)mfpr(TODR) - TODRZERO)/100 > SECYR+SECDAY)

/*
 * Software clock is software interrupt level 8,
 * implemented as mtpr(SIRR, 0x8) in asm.sed.
 */

#ifndef LOCORE
/*
 * 8200s and 630s have a clock chip like those found in digital alarm
 * clocks and watches.  Converting this to and from system times is
 * painful, so we do it in only one place.  The routine chiptotime()
 * converts a chiptime to the right value for time.tv_sec, and
 * timetochip converts time.tv_sec back.
 */
struct chiptime {
        int     sec;
        int     min;
        int     hour;
        int     day;
        int     mon;
        int     year;
};

/*
 * Clock read routine return values.
 */
#define CLKREAD_OK      0       /* success, time.tv_sec set */
#define CLKREAD_WARN    1       /* clock appears wrong but time set anyway */
#define CLKREAD_BAD     2       /* clock is bad, no time available */
#endif