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clock.c revision 1.3 
      1 /*	$NetBSD: clock.c,v 1.3 2000/07/24 18:40:00 jdolecek 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. All advertising materials mentioning features or use of this software
     27  *    must display the following acknowledgement:
     28  *	This product includes software developed by the University of
     29  *	California, Berkeley and its contributors.
     30  * 4. Neither the name of the University nor the names of its contributors
     31  *    may be used to endorse or promote products derived from this software
     32  *    without specific prior written permission.
     33  *
     34  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     35  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     36  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     37  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     38  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     39  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     40  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     41  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     42  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     43  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     44  * SUCH DAMAGE.
     45  *
     46  *	@(#)clock.c	8.1 (Berkeley) 6/11/93
     47  */
     48 
     49 /*
     50  * Clock driver.
     51  */
     52 
     53 #include "sboot.h"
     54 #include "clockreg.h"
     55 
     56 #include <machine/prom.h>
     57 #include "libsa.h"
     58 
     59 static struct clockreg *clockreg = (struct clockreg *) CLOCK_ADDR;
     60 
     61 /*
     62  * Set up the system's time, given a `reasonable' time value.
     63  */
     64 u_long time()
     65 {
     66 	struct clockreg *cl = clockreg;
     67 	int sec, min, hour, day, mon, year;
     68 
     69 	cl->cl_csr |= CLK_READ;		/* enable read (stop time) */
     70 	sec = cl->cl_sec;
     71 	min = cl->cl_min;
     72 	hour = cl->cl_hour;
     73 	day = cl->cl_mday;
     74 	mon = cl->cl_month;
     75 	year = cl->cl_year;
     76 	cl->cl_csr &= ~CLK_READ;	/* time wears on */
     77 	return(chiptotime(sec, min, hour, day, mon, year));
     78 }
     79