Home | History | Annotate | Line # | Download | only in luna68k 
      1 /* $NetBSD: clock.c,v 1.9 2013/01/26 15:46:24 tsutsui Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1988 University of Utah.
      5  * Copyright (c) 1992, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * the Systems Programming Group of the University of Utah Computer
     10  * Science Department and Ralph Campbell.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  * from: Utah Hdr: clock.c 1.18 91/01/21
     37  *
     38  *	@(#)clock.c	8.1 (Berkeley) 6/10/93
     39  */
     40 
     41 #include <sys/cdefs.h>
     42 __KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.9 2013/01/26 15:46:24 tsutsui Exp $");
     43 
     44 #include <sys/param.h>
     45 #include <sys/systm.h>
     46 #include <sys/device.h>
     47 #include <sys/kernel.h>
     48 
     49 #include <machine/cpu.h>
     50 
     51 #include <dev/clock_subr.h>
     52 
     53 /*
     54  * Machine-dependent clock routines.
     55  *
     56  * Startrtclock restarts the real-time clock, which provides
     57  * hardclock interrupts to kern_clock.c.
     58  *
     59  */
     60 
     61 int clock_enable;		/* XXX to be removed XXX */
     62 
     63 /*
     64  * Start the real-time and statistics clocks. Leave stathz 0 since there
     65  * are no other timers available.
     66  */
     67 void
     68 cpu_initclocks(void)
     69 {
     70 	int s;
     71 
     72 	if (machtype == LUNA_I)
     73 		hz = 60;	/* LUNA-I is clocked at 60Hz, not 100Hz */
     74 
     75 	tick = 1000000 / hz;	/* number of microseconds between interrupts */
     76 
     77 	/*
     78 	 * Get the clock started.
     79 	 */
     80 	s = splhigh();
     81 	/*
     82 	 * XXX
     83 	 * I guess it's necessary to program clock source with
     84 	 * approprivate mode/value.
     85 	 * XXX
     86 	 */
     87 	clock_enable = 1;
     88 	splx(s);
     89 }
     90 
     91 /*
     92  * We assume newhz is either stathz or profhz, and that neither will
     93  * change after being set up above.  Could recalculate intervals here
     94  * but that would be a drag.
     95  */
     96 void
     97 setstatclockrate(int newhz)
     98 {
     99 	/* nothing we can do */
    100 }
    101