Generic soft interrupt support for the evbarm port. Two caveats:
* This is not currently used by the in-tree evbarm interrupt code. New interrupt code will appear "soon" which makes use of this file. * This file will probably move to a generic ARM location eventually.
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thorpej
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/* $NetBSD: softintr.c,v 1.1 2002/01/24 18:48:03 thorpej Exp $ */
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/*
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* Copyright (c) 2001 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Jason R. Thorpe for Wasabi Systems, Inc.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/malloc.h>
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/* XXX Network interrupts should be converted to new softintrs. */
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#include <net/netisr.h>
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#include <uvm/uvm_extern.h>
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#include <machine/intr.h>
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struct soft_intrq soft_intrq[SI_NQUEUES];
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struct soft_intrhand *softnet_intrhand;
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void netintr(void);
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/*
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* softintr_init:
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*
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* Initialize the software interrupt system.
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*/
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void
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softintr_init(void)
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{
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static const char *softintr_names[] = SI_QUEUENAMES;
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struct soft_intrq *siq;
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int i;
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for (i = 0; i < SI_NQUEUES; i++) {
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siq = &soft_intrq[i];
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TAILQ_INIT(&siq->siq_list);
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evcnt_attach_dynamic(&siq->siq_evcnt, EVCNT_TYPE_INTR,
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NULL, "soft", softintr_names[i]);
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siq->siq_si = i;
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}
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/* XXX Establish legacy software interrupt handlers. */
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softnet_intrhand = softintr_establish(IPL_SOFTNET,
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(void (*)(void *))netintr, NULL);
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assert(softnet_intrhand != NULL);
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}
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/*
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* softintr_dispatch:
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*
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* Process pending software interrupts on the specified queue.
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*
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* NOTE: We must already be at the correct interrupt priority level.
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*/
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void
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softintr_dispatch(int si)
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{
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struct soft_intrq *siq = &soft_intrq[si];
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struct soft_intrhand *sih;
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int oldirqstate;
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siq->siq_evcnt.ev_count++;
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for (;;) {
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oldirqstate = disable_interrupts(I32_bit);
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sih = TAILQ_FIRST(&siq->siq_list);
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if (sih == NULL) {
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restore_interrupts(oldirqstate);
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break;
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}
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TAILQ_REMOVE(&siq->siq_list, sih, sih_list);
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sih->sih_pending = 0;
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uvmexp.softs++;
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restore_interrupts(oldirqstate);
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(*sih->sih_func)(sih->sih_arg);
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}
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}
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/*
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* softintr_establish: [interface]
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*
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* Register a software interrupt handler.
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*/
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void *
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softintr_establish(int ipl, void (*func)(void *), void *arg)
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{
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struct soft_intrhand *sih;
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int si;
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switch (ipl) {
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case IPL_SOFT:
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si = SI_SOFT;
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break;
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case IPL_SOFTCLOCK:
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si = SI_SOFTCLOCK;
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break;
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case IPL_SOFTNET:
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si = SI_SOFTNET;
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break;
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case IPL_SOFTSERIAL:
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si = SI_SOFTSERIAL;
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break;
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default:
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panic("softintr_establish: unknown soft IPL %d", ipl);
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}
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sih = malloc(sizeof(*sih), M_DEVBUF, M_NOWAIT);
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if (__predict_true(sih != NULL)) {
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sih->sih_func = func;
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sih->sih_arg = arg;
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sih->sih_siq = &soft_intrq[si];
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sih->sih_pending = 0;
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}
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return (sih);
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}
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/*
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* softintr_disestablish: [interface]
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*
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* Unregister a software interrupt handler.
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*/
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void
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softintr_disestablish(void *arg)
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{
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struct soft_intrhand *sih = arg;
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struct soft_intrq *siq = sih->sih_siq;
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int oldirqstate;
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oldirqstate = disable_interrupts(I32_bit);
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if (sih->sih_pending) {
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TAILQ_REMOVE(&siq->siq_list, sih, sih_list);
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sih->sih_pending = 0;
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}
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restore_interrupts(oldirqstate);
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free(sih, M_DEVBUF);
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}
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void
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netintr(void)
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{
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int n, s;
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s = splhigh();
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n = netisr;
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netisr = 0;
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splx(s);
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#define DONETISR(bit, fn) \
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do { \
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if (n & (1 << (bit))) \
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fn(); \
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} while (/*CONSTCOND*/0)
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#include <net/netisr_dispatch.h>
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#undef DONETISR
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}
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