NetBSD-5.0.2/sys/arch/pmax/pmax/clock.c
/* $NetBSD: clock.c,v 1.35 2008/01/03 23:02:24 joerg Exp $ */
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department and Ralph Campbell.
*
* 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. 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.
*
* from: Utah Hdr: clock.c 1.18 91/01/21
*
* @(#)clock.c 8.1 (Berkeley) 6/10/93
*/
/*
* Copyright (c) 1988 University of Utah.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department and Ralph Campbell.
*
* 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.
*
* from: Utah Hdr: clock.c 1.18 91/01/21
*
* @(#)clock.c 8.1 (Berkeley) 6/10/93
*/
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.35 2008/01/03 23:02:24 joerg Exp $");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <dev/clock_subr.h>
#include <dev/dec/clockvar.h>
#include <machine/sysconf.h>
#include "opt_ntp.h"
struct device *clockdev;
const struct clockfns *clockfns;
int clockinitted;
#ifdef NTP
extern int fixtick; /* XXX */
#endif
void
clockattach(dev, fns)
struct device *dev;
const struct clockfns *fns;
{
/*
* Just bookkeeping.
*/
printf("\n");
if (clockfns != NULL)
panic("clockattach: multiple clocks");
clockdev = dev;
clockfns = fns;
#ifdef EVCNT_COUNTERS
evcnt_attach_dynamic(&clock_intr_evcnt, EVCNT_TYPE_INTR, NULL,
dev->dv_xname, "intr");
#endif
}
/*
* Machine-dependent clock routines.
*
* Startrtclock restarts the real-time clock, which provides
* hardclock interrupts to kern_clock.c.
*/
/*
* Start the real-time and statistics clocks. Leave stathz 0 since there
* are no other timers available.
*/
void
cpu_initclocks()
{
if (clockfns == NULL)
panic("cpu_initclocks: no clock attached");
/*
* Establish the clock interrupt; it's a special case.
*
* We establish the clock interrupt this late because if
* we do it at clock attach time, we may have never been at
* spl0() since taking over the system. Some versions of
* PALcode save a clock interrupt, which would get delivered
* when we spl0() in autoconf.c. If established the clock
* interrupt handler earlier, that interrupt would go to
* hardclock, which would then fall over because p->p_stats
* isn't set at that time.
*/
/*
* Get the clock started.
*/
(*clockfns->cf_init)(clockdev);
/*
* Set hz-related variables after the clock is initialised in
* case the initialisation routines adjusted hz.
*/
tick = 1000000 / hz; /* number of microseconds between interrupts */
/* setup time counters */
if (platform.tc_init)
(*platform.tc_init)();
}
/*
* We assume newhz is either stathz or profhz, and that neither will
* change after being set up above. Could recalculate intervals here
* but that would be a drag.
*/
void
setstatclockrate(newhz)
int newhz;
{
/* nothing we can do */
}