NetBSD-5.0.2/sys/arch/mips/mips/mips3_clockintr.c
/* $NetBSD: mips3_clockintr.c,v 1.8 2008/08/03 09:14:28 tsutsui 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: mips3_clockintr.c,v 1.8 2008/08/03 09:14:28 tsutsui Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/cpu.h>
#include <sys/evcnt.h>
#include <sys/intr.h>
#include <mips/mips3_clock.h>
#include <machine/locore.h>
struct evcnt mips_int5_evcnt =
EVCNT_INITIALIZER(EVCNT_TYPE_INTR, NULL, "mips", "int 5 (clock)");
struct evcnt mips_int5_missed_evcnt =
EVCNT_INITIALIZER(EVCNT_TYPE_INTR, NULL, "mips", "missed int 5");
uint32_t next_cp0_clk_intr; /* used to schedule hard clock interrupts */
/*
* Handling to be done upon receipt of a MIPS 3 clock interrupt. This
* routine is to be called from the master interrupt routine
* (e.g. cpu_intr), if MIPS INT5 is pending. The caller is
* responsible for blocking and renabling the interrupt in the
* cpu_intr() routine.
*/
void
mips3_clockintr(struct clockframe *cfp)
{
uint32_t new_cnt;
next_cp0_clk_intr += curcpu()->ci_cycles_per_hz;
mips3_cp0_compare_write(next_cp0_clk_intr);
/* Check for lost clock interrupts */
new_cnt = mips3_cp0_count_read();
/*
* Missed one or more clock interrupts, so let's start
* counting again from the current value.
*/
if ((next_cp0_clk_intr - new_cnt) & 0x80000000) {
next_cp0_clk_intr = new_cnt + curcpu()->ci_cycles_per_hz;
mips3_cp0_compare_write(next_cp0_clk_intr);
mips_int5_missed_evcnt.ev_count++;
}
hardclock(cfp);
mips_int5_evcnt.ev_count++;
/* caller should renable clock interrupts */
}
/*
* Start the real-time and statistics clocks. Leave stathz 0 since there
* are no other timers available.
*/
void
mips3_initclocks(void)
{
evcnt_attach_static(&mips_int5_evcnt);
next_cp0_clk_intr = mips3_cp0_count_read() + curcpu()->ci_cycles_per_hz;
mips3_cp0_compare_write(next_cp0_clk_intr);
mips3_init_tc();
/*
* Now we can enable all interrupts including hardclock(9)
* by CPU INT5.
*/
_splnone();
}
/*
* 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
mips3_setstatclockrate(int newhz)
{
/* nothing we can do */
}
__weak_alias(setstatclockrate, mips3_setstatclockrate);
__weak_alias(cpu_initclocks, mips3_initclocks);