131 lines
3.5 KiB
C
131 lines
3.5 KiB
C
/*
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* Copyright (c) 1997, Stefan Esser <se@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <machine/ipl.h>
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#include <sys/interrupt.h>
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struct swilist {
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swihand_t *sl_handler;
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struct swilist *sl_next;
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};
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static struct swilist swilists[NSWI];
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void
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register_swi(intr, handler)
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int intr;
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swihand_t *handler;
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{
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struct swilist *slp, *slq;
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int s;
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if (intr < NHWI || intr >= NHWI + NSWI)
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panic("register_swi: bad intr %d", intr);
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if (handler == swi_generic || handler == swi_null)
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panic("register_swi: bad handler %p", (void *)handler);
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slp = &swilists[intr - NHWI];
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s = splhigh();
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if (ihandlers[intr] == swi_null)
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ihandlers[intr] = handler;
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else {
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if (slp->sl_next == NULL) {
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slp->sl_handler = ihandlers[intr];
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ihandlers[intr] = swi_generic;
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}
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slq = malloc(sizeof(*slq), M_DEVBUF, M_NOWAIT);
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if (slq == NULL)
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panic("register_swi: malloc failed");
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slq->sl_handler = handler;
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slq->sl_next = NULL;
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while (slp->sl_next != NULL)
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slp = slp->sl_next;
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slp->sl_next = slq;
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}
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splx(s);
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}
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void
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swi_dispatcher(intr)
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int intr;
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{
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struct swilist *slp;
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slp = &swilists[intr - NHWI];
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do {
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(*slp->sl_handler)();
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slp = slp->sl_next;
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} while (slp != NULL);
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}
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void
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unregister_swi(intr, handler)
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int intr;
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swihand_t *handler;
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{
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struct swilist *slfoundpred, *slp, *slq;
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int s;
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if (intr < NHWI || intr >= NHWI + NSWI)
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panic("unregister_swi: bad intr %d", intr);
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if (handler == swi_generic || handler == swi_null)
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panic("unregister_swi: bad handler %p", (void *)handler);
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slp = &swilists[intr - NHWI];
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s = splhigh();
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if (ihandlers[intr] == handler)
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ihandlers[intr] = swi_null;
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else if (slp->sl_next != NULL) {
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slfoundpred = NULL;
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for (slq = slp->sl_next; slq != NULL;
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slp = slq, slq = slp->sl_next)
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if (slq->sl_handler == handler)
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slfoundpred = slp;
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slp = &swilists[intr - NHWI];
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if (slfoundpred != NULL) {
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slq = slfoundpred->sl_next;
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slfoundpred->sl_next = slq->sl_next;
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free(slq, M_DEVBUF);
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} else if (slp->sl_handler == handler) {
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slq = slp->sl_next;
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slp->sl_next = slq->sl_next;
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slp->sl_handler = slq->sl_handler;
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free(slq, M_DEVBUF);
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}
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if (slp->sl_next == NULL)
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ihandlers[intr] = slp->sl_handler;
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}
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splx(s);
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}
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