81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
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/*-
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* Copyright (c) 2013 Neel Natu <neel@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, this list of conditions and the following 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 NETAPP, INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <stdbool.h>
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#include <assert.h>
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/*
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* Used to keep track of legacy interrupt owners/requestors
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*/
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#define NLIRQ 16
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static struct lirqinfo {
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bool li_generic;
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bool li_allocated;
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} lirq[NLIRQ];
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void
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legacy_irq_init(void)
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{
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/*
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* Allow ISA IRQs 5,10,11,12, and 15 to be available for generic use.
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*/
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lirq[5].li_generic = true;
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lirq[10].li_generic = true;
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lirq[11].li_generic = true;
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lirq[12].li_generic = true;
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lirq[15].li_generic = true;
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}
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int
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legacy_irq_alloc(int irq)
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{
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int i;
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assert(irq < NLIRQ);
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if (irq < 0) {
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for (i = 0; i < NLIRQ; i++) {
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if (lirq[i].li_generic && !lirq[i].li_allocated) {
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irq = i;
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break;
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}
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}
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} else {
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if (lirq[irq].li_allocated)
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irq = -1;
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}
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if (irq >= 0) {
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lirq[irq].li_allocated = true;
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return (irq);
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} else
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return (-1);
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}
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