716 lines
19 KiB
C
716 lines
19 KiB
C
/*-
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* Copyright (c) 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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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 University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS 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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* from: @(#)isa.c 7.2 (Berkeley) 5/13/91
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* $FreeBSD$
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*/
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#include "opt_auto_eoi.h"
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#include "isa.h"
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#include <sys/param.h>
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#include <sys/bus.h>
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#ifndef SMP
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#include <machine/lock.h>
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#endif
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/syslog.h>
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#include <sys/ipl.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/unistd.h>
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#include <sys/errno.h>
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#include <sys/interrupt.h>
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#include <machine/md_var.h>
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#include <machine/segments.h>
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#include <sys/bus.h>
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#if defined(APIC_IO)
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#include <machine/smp.h>
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#include <machine/smptests.h> /** FAST_HI */
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#include <machine/resource.h>
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#endif /* APIC_IO */
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#ifdef PC98
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#include <pc98/pc98/pc98.h>
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#include <pc98/pc98/pc98_machdep.h>
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#include <pc98/pc98/epsonio.h>
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#else
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#include <i386/isa/isa.h>
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#endif
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#include <i386/isa/icu.h>
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#if NISA > 0
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#include <isa/isavar.h>
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#endif
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#include <i386/isa/intr_machdep.h>
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#include <sys/interrupt.h>
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#ifdef APIC_IO
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#include <machine/clock.h>
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#endif
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#include "mca.h"
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#if NMCA > 0
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#include <i386/isa/mca_machdep.h>
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#endif
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/*
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* Per-interrupt data.
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*/
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u_long *intr_countp[ICU_LEN]; /* pointers to interrupt counters */
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driver_intr_t *intr_handler[ICU_LEN]; /* first level interrupt handler */
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struct ithd *ithds[ICU_LEN]; /* real interrupt handler */
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void *intr_unit[ICU_LEN];
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static inthand_t *fastintr[ICU_LEN] = {
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&IDTVEC(fastintr0), &IDTVEC(fastintr1),
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&IDTVEC(fastintr2), &IDTVEC(fastintr3),
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&IDTVEC(fastintr4), &IDTVEC(fastintr5),
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&IDTVEC(fastintr6), &IDTVEC(fastintr7),
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&IDTVEC(fastintr8), &IDTVEC(fastintr9),
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&IDTVEC(fastintr10), &IDTVEC(fastintr11),
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&IDTVEC(fastintr12), &IDTVEC(fastintr13),
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&IDTVEC(fastintr14), &IDTVEC(fastintr15),
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#if defined(APIC_IO)
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&IDTVEC(fastintr16), &IDTVEC(fastintr17),
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&IDTVEC(fastintr18), &IDTVEC(fastintr19),
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&IDTVEC(fastintr20), &IDTVEC(fastintr21),
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&IDTVEC(fastintr22), &IDTVEC(fastintr23),
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#endif /* APIC_IO */
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};
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static inthand_t *slowintr[ICU_LEN] = {
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&IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3),
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&IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7),
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&IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11),
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&IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15),
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#if defined(APIC_IO)
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&IDTVEC(intr16), &IDTVEC(intr17), &IDTVEC(intr18), &IDTVEC(intr19),
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&IDTVEC(intr20), &IDTVEC(intr21), &IDTVEC(intr22), &IDTVEC(intr23),
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#endif /* APIC_IO */
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};
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static driver_intr_t isa_strayintr;
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#ifdef PC98
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#define NMI_PARITY 0x04
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#define NMI_EPARITY 0x02
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#else
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#define NMI_PARITY (1 << 7)
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#define NMI_IOCHAN (1 << 6)
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#define ENMI_WATCHDOG (1 << 7)
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#define ENMI_BUSTIMER (1 << 6)
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#define ENMI_IOSTATUS (1 << 5)
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#endif
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/*
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* Bus attachment for the ISA PIC.
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*/
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static struct isa_pnp_id atpic_ids[] = {
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{ 0x0000d041 /* PNP0000 */, "AT interrupt controller" },
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{ 0 }
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};
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static int
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atpic_probe(device_t dev)
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{
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int result;
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if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, atpic_ids)) <= 0)
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device_quiet(dev);
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return(result);
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}
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/*
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* In the APIC_IO case we might be granted IRQ 2, as this is typically
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* consumed by chaining between the two PIC components. If we're using
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* the APIC, however, this may not be the case, and as such we should
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* free the resource. (XXX untested)
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*
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* The generic ISA attachment code will handle allocating any other resources
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* that we don't explicitly claim here.
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*/
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static int
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atpic_attach(device_t dev)
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{
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#ifdef APIC_IO
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int rid;
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struct resource *res;
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/* try to allocate our IRQ and then free it */
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rid = 0;
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res = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0, ~0, 1, 0);
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if (res != NULL)
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bus_release_resource(dev, SYS_RES_IRQ, rid, res);
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#endif
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return(0);
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}
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static device_method_t atpic_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, atpic_probe),
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DEVMETHOD(device_attach, atpic_attach),
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DEVMETHOD(device_detach, bus_generic_detach),
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DEVMETHOD(device_shutdown, bus_generic_shutdown),
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DEVMETHOD(device_suspend, bus_generic_suspend),
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DEVMETHOD(device_resume, bus_generic_resume),
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{ 0, 0 }
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};
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static driver_t atpic_driver = {
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"atpic",
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atpic_methods,
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1, /* no softc */
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};
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static devclass_t atpic_devclass;
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DRIVER_MODULE(atpic, isa, atpic_driver, atpic_devclass, 0, 0);
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/*
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* Handle a NMI, possibly a machine check.
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* return true to panic system, false to ignore.
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*/
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int
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isa_nmi(cd)
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int cd;
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{
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int retval = 0;
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#ifdef PC98
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int port = inb(0x33);
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log(LOG_CRIT, "NMI PC98 port = %x\n", port);
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if (epson_machine_id == 0x20)
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epson_outb(0xc16, epson_inb(0xc16) | 0x1);
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if (port & NMI_PARITY) {
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log(LOG_CRIT, "BASE RAM parity error, likely hardware failure.");
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retval = 1;
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} else if (port & NMI_EPARITY) {
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log(LOG_CRIT, "EXTENDED RAM parity error, likely hardware failure.");
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retval = 1;
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} else {
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log(LOG_CRIT, "\nNMI Resume ??\n");
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}
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#else /* IBM-PC */
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int isa_port = inb(0x61);
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int eisa_port = inb(0x461);
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log(LOG_CRIT, "NMI ISA %x, EISA %x\n", isa_port, eisa_port);
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#if NMCA > 0
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if (MCA_system && mca_bus_nmi())
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return(0);
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#endif
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if (isa_port & NMI_PARITY) {
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log(LOG_CRIT, "RAM parity error, likely hardware failure.");
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retval = 1;
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}
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if (isa_port & NMI_IOCHAN) {
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log(LOG_CRIT, "I/O channel check, likely hardware failure.");
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retval = 1;
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}
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/*
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* On a real EISA machine, this will never happen. However it can
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* happen on ISA machines which implement XT style floating point
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* error handling (very rare). Save them from a meaningless panic.
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*/
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if (eisa_port == 0xff)
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return(retval);
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if (eisa_port & ENMI_WATCHDOG) {
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log(LOG_CRIT, "EISA watchdog timer expired, likely hardware failure.");
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retval = 1;
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}
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if (eisa_port & ENMI_BUSTIMER) {
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log(LOG_CRIT, "EISA bus timeout, likely hardware failure.");
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retval = 1;
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}
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if (eisa_port & ENMI_IOSTATUS) {
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log(LOG_CRIT, "EISA I/O port status error.");
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retval = 1;
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}
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#endif
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return(retval);
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}
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/*
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* Create a default interrupt table to avoid problems caused by
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* spurious interrupts during configuration of kernel, then setup
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* interrupt control unit.
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*/
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void
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isa_defaultirq()
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{
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int i;
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/* icu vectors */
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for (i = 0; i < ICU_LEN; i++)
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icu_unset(i, (driver_intr_t *)NULL);
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/* initialize 8259's */
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#if NMCA > 0
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if (MCA_system)
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outb(IO_ICU1, 0x19); /* reset; program device, four bytes */
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else
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#endif
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outb(IO_ICU1, 0x11); /* reset; program device, four bytes */
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outb(IO_ICU1+ICU_IMR_OFFSET, NRSVIDT); /* starting at this vector index */
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outb(IO_ICU1+ICU_IMR_OFFSET, IRQ_SLAVE); /* slave on line 7 */
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#ifdef PC98
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#ifdef AUTO_EOI_1
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outb(IO_ICU1+ICU_IMR_OFFSET, 0x1f); /* (master) auto EOI, 8086 mode */
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#else
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outb(IO_ICU1+ICU_IMR_OFFSET, 0x1d); /* (master) 8086 mode */
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#endif
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#else /* IBM-PC */
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#ifdef AUTO_EOI_1
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outb(IO_ICU1+ICU_IMR_OFFSET, 2 | 1); /* auto EOI, 8086 mode */
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#else
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outb(IO_ICU1+ICU_IMR_OFFSET, 1); /* 8086 mode */
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#endif
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#endif /* PC98 */
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outb(IO_ICU1+ICU_IMR_OFFSET, 0xff); /* leave interrupts masked */
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outb(IO_ICU1, 0x0a); /* default to IRR on read */
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#ifndef PC98
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outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */
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#endif /* !PC98 */
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#if NMCA > 0
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if (MCA_system)
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outb(IO_ICU2, 0x19); /* reset; program device, four bytes */
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else
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#endif
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outb(IO_ICU2, 0x11); /* reset; program device, four bytes */
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outb(IO_ICU2+ICU_IMR_OFFSET, NRSVIDT+8); /* staring at this vector index */
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outb(IO_ICU2+ICU_IMR_OFFSET, ICU_SLAVEID); /* my slave id is 7 */
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#ifdef PC98
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outb(IO_ICU2+ICU_IMR_OFFSET,9); /* 8086 mode */
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#else /* IBM-PC */
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#ifdef AUTO_EOI_2
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outb(IO_ICU2+ICU_IMR_OFFSET, 2 | 1); /* auto EOI, 8086 mode */
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#else
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outb(IO_ICU2+ICU_IMR_OFFSET,1); /* 8086 mode */
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#endif
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#endif /* PC98 */
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outb(IO_ICU2+ICU_IMR_OFFSET, 0xff); /* leave interrupts masked */
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outb(IO_ICU2, 0x0a); /* default to IRR on read */
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}
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/*
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* Caught a stray interrupt, notify
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*/
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static void
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isa_strayintr(vcookiep)
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void *vcookiep;
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{
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int intr = (void **)vcookiep - &intr_unit[0];
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/*
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* XXX TODO print a different message for #7 if it is for a
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* glitch. Glitches can be distinguished from real #7's by
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* testing that the in-service bit is _not_ set. The test
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* must be done before sending an EOI so it can't be done if
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* we are using AUTO_EOI_1.
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*/
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if (intrcnt[1 + intr] <= 5)
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log(LOG_ERR, "stray irq %d\n", intr);
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if (intrcnt[1 + intr] == 5)
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log(LOG_CRIT,
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"too many stray irq %d's; not logging any more\n", intr);
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}
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#if NISA > 0
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/*
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* Return a bitmap of the current interrupt requests. This is 8259-specific
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* and is only suitable for use at probe time.
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*/
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intrmask_t
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isa_irq_pending()
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{
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u_char irr1;
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u_char irr2;
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irr1 = inb(IO_ICU1);
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irr2 = inb(IO_ICU2);
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return ((irr2 << 8) | irr1);
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}
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#endif
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/*
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* Update intrnames array with the specified name. This is used by
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* vmstat(8) and the like.
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*/
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static void
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update_intrname(int intr, char *name)
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{
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char buf[32];
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char *cp;
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int name_index, off, strayintr;
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/*
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* Initialise strings for bitbucket and stray interrupt counters.
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* These have statically allocated indices 0 and 1 through ICU_LEN.
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*/
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if (intrnames[0] == '\0') {
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off = sprintf(intrnames, "???") + 1;
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for (strayintr = 0; strayintr < ICU_LEN; strayintr++)
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off += sprintf(intrnames + off, "stray irq%d",
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strayintr) + 1;
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}
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if (name == NULL)
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name = "???";
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if (snprintf(buf, sizeof(buf), "%s irq%d", name, intr) >= sizeof(buf))
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goto use_bitbucket;
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/*
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* Search for `buf' in `intrnames'. In the usual case when it is
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* not found, append it to the end if there is enough space (the \0
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* terminator for the previous string, if any, becomes a separator).
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*/
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for (cp = intrnames, name_index = 0;
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cp != eintrnames && name_index < NR_INTRNAMES;
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cp += strlen(cp) + 1, name_index++) {
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if (*cp == '\0') {
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if (strlen(buf) >= eintrnames - cp)
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break;
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strcpy(cp, buf);
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goto found;
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}
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if (strcmp(cp, buf) == 0)
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goto found;
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}
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use_bitbucket:
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printf("update_intrname: counting %s irq%d as %s\n", name, intr,
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intrnames);
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name_index = 0;
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found:
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intr_countp[intr] = &intrcnt[name_index];
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}
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int
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icu_setup(int intr, driver_intr_t *handler, void *arg, int flags)
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{
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#ifdef FAST_HI
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int select; /* the select register is 8 bits */
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int vector;
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u_int32_t value; /* the window register is 32 bits */
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#endif /* FAST_HI */
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u_long ef;
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#if defined(APIC_IO)
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if ((u_int)intr >= ICU_LEN) /* no 8259 SLAVE to ignore */
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#else
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if ((u_int)intr >= ICU_LEN || intr == ICU_SLAVEID)
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#endif /* APIC_IO */
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if (intr_handler[intr] != isa_strayintr)
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return (EBUSY);
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ef = read_eflags();
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disable_intr();
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intr_handler[intr] = handler;
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intr_unit[intr] = arg;
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#ifdef FAST_HI
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if (flags & INTR_FAST) {
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vector = TPR_FAST_INTS + intr;
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setidt(vector, fastintr[intr],
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SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
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}
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else {
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vector = TPR_SLOW_INTS + intr;
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#ifdef APIC_INTR_REORDER
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#ifdef APIC_INTR_HIGHPRI_CLOCK
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/* XXX: Hack (kludge?) for more accurate clock. */
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if (intr == apic_8254_intr || intr == 8) {
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vector = TPR_FAST_INTS + intr;
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}
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#endif
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#endif
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setidt(vector, slowintr[intr],
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SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
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}
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#ifdef APIC_INTR_REORDER
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set_lapic_isrloc(intr, vector);
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#endif
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/*
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* Reprogram the vector in the IO APIC.
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*/
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if (int_to_apicintpin[intr].ioapic >= 0) {
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select = int_to_apicintpin[intr].redirindex;
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value = io_apic_read(int_to_apicintpin[intr].ioapic,
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|
select) & ~IOART_INTVEC;
|
|
io_apic_write(int_to_apicintpin[intr].ioapic,
|
|
select, value | vector);
|
|
}
|
|
#else
|
|
setidt(ICU_OFFSET + intr,
|
|
flags & INTR_FAST ? fastintr[intr] : slowintr[intr],
|
|
SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
|
|
#endif /* FAST_HI */
|
|
INTREN(1 << intr);
|
|
write_eflags(ef);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Dissociate an interrupt handler from an IRQ and set the handler to
|
|
* the stray interrupt handler. The 'handler' parameter is used only
|
|
* for consistency checking.
|
|
*/
|
|
int
|
|
icu_unset(intr, handler)
|
|
int intr;
|
|
driver_intr_t *handler;
|
|
{
|
|
u_long ef;
|
|
|
|
if ((u_int)intr >= ICU_LEN || handler != intr_handler[intr])
|
|
return (EINVAL);
|
|
|
|
INTRDIS(1 << intr);
|
|
ef = read_eflags();
|
|
disable_intr();
|
|
intr_countp[intr] = &intrcnt[1 + intr];
|
|
intr_handler[intr] = isa_strayintr;
|
|
intr_unit[intr] = &intr_unit[intr];
|
|
#ifdef FAST_HI_XXX
|
|
/* XXX how do I re-create dvp here? */
|
|
setidt(flags & INTR_FAST ? TPR_FAST_INTS + intr : TPR_SLOW_INTS + intr,
|
|
slowintr[intr], SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
|
|
#else /* FAST_HI */
|
|
#ifdef APIC_INTR_REORDER
|
|
set_lapic_isrloc(intr, ICU_OFFSET + intr);
|
|
#endif
|
|
setidt(ICU_OFFSET + intr, slowintr[intr], SDT_SYS386IGT, SEL_KPL,
|
|
GSEL(GCODE_SEL, SEL_KPL));
|
|
#endif /* FAST_HI */
|
|
write_eflags(ef);
|
|
return (0);
|
|
}
|
|
|
|
struct intrhand *
|
|
inthand_add(const char *name, int irq, driver_intr_t handler, void *arg,
|
|
int pri, int flags)
|
|
{
|
|
struct ithd *ithd = ithds[irq]; /* descriptor for the IRQ */
|
|
struct intrhand *head; /* chain of handlers for IRQ */
|
|
struct intrhand *idesc; /* descriptor for this handler */
|
|
struct proc *p; /* interrupt thread */
|
|
int errcode = 0;
|
|
|
|
if (name == NULL) /* no name? */
|
|
panic ("anonymous interrupt");
|
|
if (ithd == NULL || ithd->it_ih == NULL) {
|
|
/* first handler for this irq. */
|
|
if (ithd == NULL) {
|
|
ithd = malloc(sizeof (struct ithd), M_DEVBUF, M_WAITOK);
|
|
if (ithd == NULL)
|
|
return (NULL);
|
|
bzero(ithd, sizeof(struct ithd));
|
|
ithd->irq = irq;
|
|
ithds[irq] = ithd;
|
|
}
|
|
/*
|
|
* If we have a fast interrupt, we need to set the
|
|
* handler address directly. Do that below. For a
|
|
* slow interrupt, we don't need to know more details,
|
|
* so do it here because it's tidier.
|
|
*/
|
|
if ((flags & INTR_FAST) == 0) {
|
|
/*
|
|
* Only create a kernel thread if we don't already
|
|
* have one.
|
|
*/
|
|
if (ithd->it_proc == NULL) {
|
|
errcode = kthread_create(ithd_loop, NULL, &p,
|
|
RFSTOPPED | RFHIGHPID, "irq%d: %s", irq,
|
|
name);
|
|
if (errcode)
|
|
panic("inthand_add: Can't create "
|
|
"interrupt thread");
|
|
p->p_rtprio.type = RTP_PRIO_ITHREAD;
|
|
p->p_stat = SWAIT; /* we're idle */
|
|
|
|
/* Put in linkages. */
|
|
ithd->it_proc = p;
|
|
p->p_ithd = ithd;
|
|
} else
|
|
snprintf(ithd->it_proc->p_comm, MAXCOMLEN,
|
|
"irq%d: %s", irq, name);
|
|
p->p_rtprio.prio = pri;
|
|
|
|
/*
|
|
* The interrupt process must be in place, but
|
|
* not necessarily schedulable, before we
|
|
* initialize the ICU, since it may cause an
|
|
* immediate interrupt.
|
|
*/
|
|
if (icu_setup(irq, &sched_ithd, arg, flags) != 0)
|
|
panic("inthand_add: Can't initialize ICU");
|
|
}
|
|
} else if ((flags & INTR_EXCL) != 0
|
|
|| (ithd->it_ih->ih_flags & INTR_EXCL) != 0) {
|
|
/*
|
|
* We can't append the new handler if either
|
|
* list ithd or new handler do not allow
|
|
* interrupts to be shared.
|
|
*/
|
|
if (bootverbose)
|
|
printf("\tdevice combination %s and %s "
|
|
"doesn't support shared irq%d\n",
|
|
ithd->it_ih->ih_name, name, irq);
|
|
return(NULL);
|
|
} else if (flags & INTR_FAST) {
|
|
/* We can only have one fast interrupt by itself. */
|
|
if (bootverbose)
|
|
printf("\tCan't add fast interrupt %s"
|
|
" to normal interrupt %s on irq%d",
|
|
name, ithd->it_ih->ih_name, irq);
|
|
return (NULL);
|
|
} else { /* update p_comm */
|
|
p = ithd->it_proc;
|
|
if (strlen(p->p_comm) + strlen(name) < MAXCOMLEN) {
|
|
strcat(p->p_comm, " ");
|
|
strcat(p->p_comm, name);
|
|
} else if (strlen(p->p_comm) == MAXCOMLEN)
|
|
p->p_comm[MAXCOMLEN - 1] = '+';
|
|
else
|
|
strcat(p->p_comm, "+");
|
|
}
|
|
idesc = malloc(sizeof (struct intrhand), M_DEVBUF, M_WAITOK);
|
|
if (idesc == NULL)
|
|
return (NULL);
|
|
bzero(idesc, sizeof (struct intrhand));
|
|
|
|
idesc->ih_handler = handler;
|
|
idesc->ih_argument = arg;
|
|
idesc->ih_flags = flags;
|
|
idesc->ih_ithd = ithd;
|
|
|
|
idesc->ih_name = malloc(strlen(name) + 1, M_DEVBUF, M_WAITOK);
|
|
if (idesc->ih_name == NULL) {
|
|
free(idesc, M_DEVBUF);
|
|
return (NULL);
|
|
}
|
|
strcpy(idesc->ih_name, name);
|
|
|
|
/* Slow interrupts got set up above. */
|
|
if ((flags & INTR_FAST)
|
|
&& (icu_setup(irq, idesc->ih_handler, idesc->ih_argument,
|
|
idesc->ih_flags) != 0) ) {
|
|
if (bootverbose)
|
|
printf("\tinthand_add(irq%d) failed, result=%d\n",
|
|
irq, errcode);
|
|
free(idesc->ih_name, M_DEVBUF);
|
|
free(idesc, M_DEVBUF);
|
|
return NULL;
|
|
}
|
|
head = ithd->it_ih; /* look at chain of handlers */
|
|
if (head) {
|
|
while (head->ih_next != NULL)
|
|
head = head->ih_next; /* find the end */
|
|
head->ih_next = idesc; /* hook it in there */
|
|
} else
|
|
ithd->it_ih = idesc; /* put it up front */
|
|
update_intrname(irq, idesc->ih_name);
|
|
return (idesc);
|
|
}
|
|
|
|
/*
|
|
* Deactivate and remove linked list the interrupt handler descriptor
|
|
* data connected created by an earlier call of inthand_add(), then
|
|
* adjust the interrupt masks if necessary.
|
|
*
|
|
* Return the memory held by the interrupt handler descriptor data
|
|
* structure to the system. First ensure the handler is not actively
|
|
* in use.
|
|
*/
|
|
|
|
int
|
|
inthand_remove(struct intrhand *idesc)
|
|
{
|
|
struct ithd *ithd; /* descriptor for the IRQ */
|
|
struct intrhand *ih; /* chain of handlers */
|
|
|
|
if (idesc == NULL)
|
|
return (-1);
|
|
ithd = idesc->ih_ithd;
|
|
ih = ithd->it_ih;
|
|
|
|
if (ih == idesc) /* first in the chain */
|
|
ithd->it_ih = idesc->ih_next; /* unhook it */
|
|
else {
|
|
while ((ih != NULL)
|
|
&& (ih->ih_next != idesc) )
|
|
ih = ih->ih_next;
|
|
if (ih->ih_next != idesc)
|
|
return (-1);
|
|
ih->ih_next = ih->ih_next->ih_next;
|
|
}
|
|
|
|
if (ithd->it_ih == NULL) { /* no handlers left, */
|
|
icu_unset(ithd->irq, idesc->ih_handler);
|
|
ithds[ithd->irq] = NULL;
|
|
|
|
if ((idesc->ih_flags & INTR_FAST) == 0) {
|
|
mtx_enter(&sched_lock, MTX_SPIN);
|
|
if (ithd->it_proc->p_stat == SWAIT) {
|
|
ithd->it_proc->p_stat = SRUN;
|
|
setrunqueue(ithd->it_proc);
|
|
/*
|
|
* We don't do an ast here because we really
|
|
* don't care when it runs next.
|
|
*
|
|
* XXX: should we lower the threads priority?
|
|
*/
|
|
}
|
|
mtx_exit(&sched_lock, MTX_SPIN);
|
|
}
|
|
}
|
|
free(idesc, M_DEVBUF);
|
|
return (0);
|
|
}
|