112 lines
3.4 KiB
C
112 lines
3.4 KiB
C
/*-
|
|
* 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/rtprio.h> /* change this name XXX */
|
|
#include <sys/proc.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/syslog.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/kthread.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/module.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/unistd.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/interrupt.h>
|
|
#include <sys/random.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/time.h>
|
|
#include <machine/md_var.h>
|
|
#include <machine/segments.h>
|
|
|
|
#include <i386/isa/icu.h>
|
|
|
|
#include <isa/isavar.h>
|
|
#include <i386/isa/intr_machdep.h>
|
|
#include <sys/interrupt.h>
|
|
|
|
#include <sys/vmmeter.h>
|
|
#include <sys/ktr.h>
|
|
#include <machine/cpu.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);
|
|
}
|
|
}
|