diff options
Diffstat (limited to 'sys/arch/mvme88k/stand/openbsd/sboot/clock.c')
| -rw-r--r-- | sys/arch/mvme88k/stand/openbsd/sboot/clock.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/sys/arch/mvme88k/stand/openbsd/sboot/clock.c b/sys/arch/mvme88k/stand/openbsd/sboot/clock.c new file mode 100644 index 00000000000..ca2467abb9e --- /dev/null +++ b/sys/arch/mvme88k/stand/openbsd/sboot/clock.c @@ -0,0 +1,122 @@ +/* $Id: clock.c,v 1.1 1997/03/03 19:31:11 rahnds Exp $ */ + +/* + * Copyright (c) 1992, 1993 + * The Regents of the University of California. All rights reserved. + * Copyright (c) 1994 Gordon W. Ross + * Copyright (c) 1993 Adam Glass + * + * This software was developed by the Computer Systems Engineering group + * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and + * contributed to Berkeley. + * + * All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Lawrence Berkeley Laboratory. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)clock.c 8.1 (Berkeley) 6/11/93 + */ + +/* + * Clock driver. + */ + +#include <sys/cdefs.h> +#include "sboot.h" +#include "clockreg.h" + +static struct clockreg *clockreg = (struct clockreg *) CLOCK_ADDR; + +/* + * BCD to decimal and decimal to BCD. + */ +#define FROMBCD(x) (((x) >> 4) * 10 + ((x) & 0xf)) +#define TOBCD(x) (((x) / 10 * 16) + ((x) % 10)) + +#define SECDAY (24 * 60 * 60) +#define SECYR (SECDAY * 365) +#define LEAPYEAR(y) (((y) & 3) == 0) + +/* + * This code is defunct after 2068. + * Will Unix still be here then?? + */ +const short dayyr[12] = + {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334}; + +static u_long +chiptotime(sec, min, hour, day, mon, year) + register int sec, min, hour, day, mon, year; +{ + register int days, yr; + + sec = FROMBCD(sec); + min = FROMBCD(min); + hour = FROMBCD(hour); + day = FROMBCD(day); + mon = FROMBCD(mon); + year = FROMBCD(year) + YEAR0; + if (year < 70) + year = 70; + + /* simple sanity checks */ + if (year < 70 || mon < 1 || mon > 12 || day < 1 || day > 31) + return (0); + days = 0; + for (yr = 70; yr < year; yr++) + days += LEAPYEAR(yr) ? 366 : 365; + days += dayyr[mon - 1] + day - 1; + if (LEAPYEAR(yr) && mon > 2) + days++; + /* now have days since Jan 1, 1970; the rest is easy... */ + return (days * SECDAY + hour * 3600 + min * 60 + sec); +} + +/* + * Set up the system's time, given a `reasonable' time value. + */ +u_long +time() +{ + register struct clockreg *cl = clockreg; + int sec, min, hour, day, mon, year; + + cl->cl_csr |= CLK_READ; /* enable read (stop time) */ + sec = cl->cl_sec; + min = cl->cl_min; + hour = cl->cl_hour; + day = cl->cl_mday; + mon = cl->cl_month; + year = cl->cl_year; + cl->cl_csr &= ~CLK_READ;/* time wears on */ + return (chiptotime(sec, min, hour, day, mon, year)); +} |