mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-12-04 08:09:08 +00:00
131 lines
3.5 KiB
C
131 lines
3.5 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.
|
|
*
|
|
* $FreeBSD$
|
|
*
|
|
*/
|
|
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/malloc.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);
|
|
}
|
|
|