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Annotation of sys/arch/mvme68k/stand/sboot/clock.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: clock.c,v 1.7 2003/08/19 10:22:30 deraadt Exp $ */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 1992, 1993
        !             5:  *     The Regents of the University of California.  All rights reserved.
        !             6:  * Copyright (c) 1994 Gordon W. Ross
        !             7:  * Copyright (c) 1993 Adam Glass
        !             8:  *
        !             9:  * This software was developed by the Computer Systems Engineering group
        !            10:  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
        !            11:  * contributed to Berkeley.
        !            12:  *
        !            13:  * All advertising materials mentioning features or use of this software
        !            14:  * must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Lawrence Berkeley Laboratory.
        !            17:  *
        !            18:  * Redistribution and use in source and binary forms, with or without
        !            19:  * modification, are permitted provided that the following conditions
        !            20:  * are met:
        !            21:  * 1. Redistributions of source code must retain the above copyright
        !            22:  *    notice, this list of conditions and the following disclaimer.
        !            23:  * 2. Redistributions in binary form must reproduce the above copyright
        !            24:  *    notice, this list of conditions and the following disclaimer in the
        !            25:  *    documentation and/or other materials provided with the distribution.
        !            26:  * 3. Neither the name of the University nor the names of its contributors
        !            27:  *    may be used to endorse or promote products derived from this software
        !            28:  *    without specific prior written permission.
        !            29:  *
        !            30:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            31:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            32:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            33:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            34:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            35:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            36:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            37:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            38:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            39:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            40:  * SUCH DAMAGE.
        !            41:  *
        !            42:  *     @(#)clock.c     8.1 (Berkeley) 6/11/93
        !            43:  */
        !            44:
        !            45: /*
        !            46:  * Clock driver.
        !            47:  */
        !            48:
        !            49: #include <sys/cdefs.h>
        !            50: #include <sys/types.h>
        !            51: #include "sboot.h"
        !            52: #include "clockreg.h"
        !            53:
        !            54: static struct clockreg *clockreg = (struct clockreg *) CLOCK_ADDR;
        !            55:
        !            56: /*
        !            57:  * BCD to decimal and decimal to BCD.
        !            58:  */
        !            59: #define        FROMBCD(x)      (((x) >> 4) * 10 + ((x) & 0xf))
        !            60: #define        TOBCD(x)        (((x) / 10 * 16) + ((x) % 10))
        !            61:
        !            62: #define        SECDAY          (24 * 60 * 60)
        !            63: #define        SECYR           (SECDAY * 365)
        !            64: #define        LEAPYEAR(y)     (((y) & 3) == 0)
        !            65:
        !            66: /*
        !            67:  * This code is defunct after 2068.
        !            68:  * Will Unix still be here then??
        !            69:  */
        !            70: const short dayyr[12] =
        !            71:     {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
        !            72:
        !            73: static u_long
        !            74: chiptotime(int sec, int min, int hour, int day, int mon, int year)
        !            75: {
        !            76:        register int days, yr;
        !            77:
        !            78:        sec = FROMBCD(sec);
        !            79:        min = FROMBCD(min);
        !            80:        hour = FROMBCD(hour);
        !            81:        day = FROMBCD(day);
        !            82:        mon = FROMBCD(mon);
        !            83:        year = FROMBCD(year) + YEAR0;
        !            84:        if (year < 70)
        !            85:                year = 70;
        !            86:
        !            87:        /* simple sanity checks */
        !            88:        if (year < 70 || mon < 1 || mon > 12 || day < 1 || day > 31)
        !            89:                return (0);
        !            90:        days = 0;
        !            91:        for (yr = 70; yr < year; yr++)
        !            92:                days += LEAPYEAR(yr) ? 366 : 365;
        !            93:        days += dayyr[mon - 1] + day - 1;
        !            94:        if (LEAPYEAR(yr) && mon > 2)
        !            95:                days++;
        !            96:        /* now have days since Jan 1, 1970; the rest is easy... */
        !            97:        return (days * SECDAY + hour * 3600 + min * 60 + sec);
        !            98: }
        !            99:
        !           100: /*
        !           101:  * Set up the system's time, given a `reasonable' time value.
        !           102:  */
        !           103: u_long
        !           104: ttime(void)
        !           105: {
        !           106:        register struct clockreg *cl = clockreg;
        !           107:        int     sec, min, hour, day, mon, year;
        !           108:
        !           109:        cl->cl_csr |= CLK_READ; /* enable read (stop time) */
        !           110:        sec = cl->cl_sec;
        !           111:        min = cl->cl_min;
        !           112:        hour = cl->cl_hour;
        !           113:        day = cl->cl_mday;
        !           114:        mon = cl->cl_month;
        !           115:        year = cl->cl_year;
        !           116:        cl->cl_csr &= ~CLK_READ;/* time wears on */
        !           117:        return (chiptotime(sec, min, hour, day, mon, year));
        !           118: }