130 lines
3.6 KiB
C
130 lines
3.6 KiB
C
/* $NetBSD: timer.c,v 1.1 2001/06/13 15:00:26 soda Exp $ */
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/* NetBSD: clock.c,v 1.31 2001/05/27 13:53:24 sommerfeld Exp */
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/*
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department and Ralph Campbell.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Utah Hdr: clock.c 1.18 91/01/21
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*
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* @(#)clock.c 8.1 (Berkeley) 6/10/93
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*/
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#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
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__KERNEL_RCSID(0, "$NetBSD: timer.c,v 1.1 2001/06/13 15:00:26 soda Exp $");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <arc/arc/timervar.h>
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struct device *timerdev;
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const struct timerfns *timerfns;
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int timerinitted;
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void
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timerattach(dev, fns)
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struct device *dev;
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const struct timerfns *fns;
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{
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/*
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* Just bookkeeping.
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*/
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if (timerfns != NULL)
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panic("timerattach: multiple timers");
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timerdev = dev;
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timerfns = fns;
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}
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/*
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* Machine-dependent clock routines.
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*/
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/*
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* Start the real-time and statistics clocks. Leave stathz 0 since there
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* are no other timers available.
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*/
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void
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cpu_initclocks()
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{
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if (timerfns == NULL)
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panic("cpu_initclocks: no timer attached");
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tick = 1000000 / hz; /* number of microseconds between interrupts */
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tickfix = 1000000 - (hz * tick);
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if (tickfix) {
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int ftp;
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ftp = min(ffs(tickfix), ffs(hz));
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tickfix >>= (ftp - 1);
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tickfixinterval = hz >> (ftp - 1);
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}
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/*
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* Get the clock started.
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*/
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(*timerfns->tf_init)(timerdev);
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}
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/*
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* We assume newhz is either stathz or profhz, and that neither will
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* change after being set up above. Could recalculate intervals here
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* but that would be a drag.
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*/
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void
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setstatclockrate(newhz)
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int newhz;
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{
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/* nothing we can do */
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}
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/*
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* Wait "n" microseconds.
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* XXX Should be calibrated with the cycle counter.
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*/
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void
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delay(n)
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int n;
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{
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DELAY(n);
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}
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