Implement generic softintr(9) support for news68k.
Mostly taken from mvme68k.
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tsutsui
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/* $NetBSD: softintr.c,v 1.1 2007/02/10 02:57:46 tsutsui Exp $ */
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/*-
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* Copyright (c) 2000 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Steve C. Woodford and Jason R. Thorpe.
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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 by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND 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 THE FOUNDATION OR CONTRIBUTORS
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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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/*
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* Generic soft interrupt implementation for news68k.
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* Taken from mvme68k one, which is based heavily on
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* the alpha implementation by Jason Thorpe.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <sys/sched.h>
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#include <sys/vmmeter.h>
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#include <uvm/uvm_extern.h>
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#include <machine/cpu.h>
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#include <machine/intr.h>
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#include <news68k/news68k/isr.h>
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struct news68k_soft_intrhand *softnet_intrhand;
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static struct news68k_soft_intr news68k_soft_intrs[SI_NQUEUES];
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extern void _softintr(void); /* locore.s */
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static inline int
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ssir_pending(volatile unsigned char *ssptr)
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{
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int __rv;
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__asm volatile(
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" moveq #0, %0 \n"
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" tas %1 \n"
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" jne 1f \n"
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" moveq #1, %0 \n"
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"1: \n"
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: "=d" (__rv)
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: "m" (*ssptr));
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return __rv;
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}
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/*
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* softintr_init()
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*
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* Initialise mvme68k software interrupt subsystem.
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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 news68k_soft_intr *nsi;
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int i;
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for (i = 0; i < SI_NQUEUES; i++) {
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nsi = &news68k_soft_intrs[i];
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LIST_INIT(&nsi->nsi_q);
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nsi->nsi_ssir = 1;
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evcnt_attach_dynamic(&nsi->nsi_evcnt, EVCNT_TYPE_INTR,
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NULL, "soft", softintr_names[i]);
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}
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isrlink_custom(SOFTINTR_IPL, (void *)_softintr);
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/* 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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#ifdef DEBUG
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assert(softnet_intrhand != NULL);
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#endif
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}
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/*
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* softintr_dispatch()
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*
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* Internal function for running queued soft interrupts.
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*/
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void
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softintr_dispatch(void)
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{
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struct news68k_soft_intr *nsi;
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struct news68k_soft_intrhand *sih;
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int handled;
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/* disable level 2 interrupt */
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*ctrl_int2 = 0;
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uvmexp.softs++;
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do {
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for (nsi = news68k_soft_intrs, handled = 0;
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nsi < &news68k_soft_intrs[SI_NQUEUES];
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nsi++) {
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if (ssir_pending(&nsi->nsi_ssir) == 0)
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continue;
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nsi->nsi_evcnt.ev_count++;
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handled++;
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for (sih = LIST_FIRST(&nsi->nsi_q);
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sih != NULL;
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sih = LIST_NEXT(sih, sih_q)) {
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if (sih->sih_pending) {
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uvmexp.softs++;
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sih->sih_pending = 0;
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(*sih->sih_fn)(sih->sih_arg);
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}
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}
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}
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} while (handled);
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}
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static int
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ipl2si(int ipl)
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{
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int si;
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switch (ipl) {
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case IPL_SOFTSERIAL:
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si = SI_SOFTSERIAL;
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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_SOFTCLOCK:
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si = SI_SOFTCLOCK;
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break;
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case IPL_SOFT:
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si = SI_SOFT;
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break;
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default:
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panic("ipl2si: %d", ipl);
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}
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return si;
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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 news68k_soft_intr *nsi;
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struct news68k_soft_intrhand *sih;
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int si;
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int s;
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si = ipl2si(ipl);
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nsi = &news68k_soft_intrs[si];
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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_intrhead = nsi;
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sih->sih_fn = func;
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sih->sih_arg = arg;
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sih->sih_pending = 0;
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s = splsoft();
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LIST_INSERT_HEAD(&nsi->nsi_q, sih, sih_q);
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splx(s);
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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 news68k_soft_intrhand *sih;
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int s;
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sih = arg;
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s = splsoft();
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LIST_REMOVE(sih, sih_q);
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splx(s);
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free(sih, M_DEVBUF);
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}
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