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/*
* Copyright (c) 1997, Stefan Esser <se@freebsd.org>
* 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 unmodified, 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* $Id: kern_intr.c,v 1.21 1998/11/10 09:16:29 peter Exp $
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/errno.h>
#include <machine/ipl.h>
#include <sys/interrupt.h>
struct swilist {
swihand_t *sl_handler;
struct swilist *sl_next;
};
static struct swilist swilists[NSWI];
void
register_swi(intr, handler)
int intr;
swihand_t *handler;
{
struct swilist *slp, *slq;
int s;
if (intr < NHWI || intr >= NHWI + NSWI)
panic("register_swi: bad intr %d", intr);
if (handler == swi_generic || handler == swi_null)
panic("register_swi: bad handler %p", (void *)handler);
slp = &swilists[intr - NHWI];
s = splhigh();
if (ihandlers[intr] == swi_null)
ihandlers[intr] = handler;
else {
if (slp->sl_next == NULL) {
slp->sl_handler = ihandlers[intr];
ihandlers[intr] = swi_generic;
}
slq = malloc(sizeof(*slq), M_DEVBUF, M_NOWAIT);
if (slq == NULL)
panic("register_swi: malloc failed");
slq->sl_handler = handler;
slq->sl_next = NULL;
while (slp->sl_next != NULL)
slp = slp->sl_next;
slp->sl_next = slq;
}
splx(s);
}
void
swi_dispatcher(intr)
int intr;
{
struct swilist *slp;
slp = &swilists[intr - NHWI];
do {
(*slp->sl_handler)();
slp = slp->sl_next;
} while (slp != NULL);
}
void
unregister_swi(intr, handler)
int intr;
swihand_t *handler;
{
struct swilist *slfoundpred, *slp, *slq;
int s;
if (intr < NHWI || intr >= NHWI + NSWI)
panic("unregister_swi: bad intr %d", intr);
if (handler == swi_generic || handler == swi_null)
panic("unregister_swi: bad handler %p", (void *)handler);
slp = &swilists[intr - NHWI];
s = splhigh();
if (ihandlers[intr] == handler)
ihandlers[intr] = swi_null;
else if (slp->sl_next != NULL) {
slfoundpred = NULL;
for (slq = slp->sl_next; slq != NULL;
slp = slq, slq = slp->sl_next)
if (slq->sl_handler == handler)
slfoundpred = slp;
slp = &swilists[intr - NHWI];
if (slfoundpred != NULL) {
slq = slfoundpred->sl_next;
slfoundpred->sl_next = slq->sl_next;
free(slq, M_DEVBUF);
} else if (slp->sl_handler == handler) {
slq = slp->sl_next;
slp->sl_next = slq->sl_next;
slp->sl_handler = slq->sl_handler;
free(slq, M_DEVBUF);
}
if (slp->sl_next == NULL)
ihandlers[intr] = slp->sl_handler;
}
splx(s);
}
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