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freebsd/sys/kern/kern_intr.c
Peter Wemm 54a8c69347 Stage 1 of a cleanup of the i386 interrupt registration mechanism.
Interrupts under the new scheme are managed by the i386 nexus with the
awareness of the resource manager.  There is further room for optimizing
the interfaces still.  All the users of register_intr()/intr_create()
should be gone, with the exception of pcic and i386/isa/clock.c.
1999-04-21 07:26:30 +00:00

132 lines
3.6 KiB
C

/*
* 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);
}