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/*-
* Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
*
* 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. Berkeley Software Design Inc's name may not be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``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 BERKELEY SOFTWARE DESIGN INC 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 BSDI: intr.c,v 1.6.2.5 1999/07/06 19:16:52 cp Exp
* $FreeBSD$
*/
/* Interrupt thread code. */
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/interrupt.h>
#include <sys/systm.h>
#include <sys/vmmeter.h>
#include <i386/isa/icu.h>
#include <i386/isa/intr_machdep.h>
struct int_entropy {
struct proc *p;
int irq;
};
static u_int straycount[ICU_LEN];
#define MAX_STRAY_LOG 5
/*
* Schedule a heavyweight interrupt process. This function is called
* from the interrupt handlers Xintr<num>.
*/
void
sched_ithd(void *cookie)
{
int irq = (int) cookie; /* IRQ we're handling */
struct ithd *ithd = ithds[irq]; /* and the process that does it */
int error;
/* This used to be in icu_vector.s */
/*
* We count software interrupts when we process them. The
* code here follows previous practice, but there's an
* argument for counting hardware interrupts when they're
* processed too.
*/
atomic_add_long(intr_countp[irq], 1); /* one more for this IRQ */
atomic_add_int(&cnt.v_intr, 1); /* one more global interrupt */
/*
* Schedule the interrupt thread to run if needed and switch to it
* if we schedule it if !cold.
*/
error = ithread_schedule(ithd, !cold);
/*
* Log stray interrupts.
*/
if (error == EINVAL)
if (straycount[irq] < MAX_STRAY_LOG) {
printf("stray irq %d\n", irq);
if (++straycount[irq] == MAX_STRAY_LOG)
printf(
"got %d stray irq %d's: not logging anymore\n",
MAX_STRAY_LOG, irq);
}
}
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