freebsd-dev/sys/i386/isa/nmi.c
John Baldwin 6008862bc2 Change callers of mtx_init() to pass in an appropriate lock type name. In
most cases NULL is passed, but in some cases such as network driver locks
(which use the MTX_NETWORK_LOCK macro) and UMA zone locks, a name is used.

Tested on:	i386, alpha, sparc64
2002-04-04 21:03:38 +00:00

721 lines
19 KiB
C

/*-
* Copyright (c) 1991 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)isa.c 7.2 (Berkeley) 5/13/91
* $FreeBSD$
*/
#include "opt_auto_eoi.h"
#include "opt_isa.h"
#include "opt_mca.h"
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/errno.h>
#include <sys/interrupt.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/syslog.h>
#include <sys/systm.h>
#include <sys/unistd.h>
#include <machine/md_var.h>
#include <machine/segments.h>
#if defined(APIC_IO)
#include <machine/smptests.h> /** FAST_HI */
#include <machine/smp.h>
#include <machine/resource.h>
#endif /* APIC_IO */
#ifdef PC98
#include <pc98/pc98/pc98.h>
#include <pc98/pc98/pc98_machdep.h>
#include <pc98/pc98/epsonio.h>
#else
#include <i386/isa/isa.h>
#endif
#include <i386/isa/icu.h>
#ifdef DEV_ISA
#include <isa/isavar.h>
#endif
#include <i386/isa/intr_machdep.h>
#include <sys/interrupt.h>
#ifdef APIC_IO
#include <machine/clock.h>
#endif
#ifdef DEV_MCA
#include <i386/isa/mca_machdep.h>
#endif
/*
* Per-interrupt data.
*/
u_long *intr_countp[ICU_LEN]; /* pointers to interrupt counters */
driver_intr_t *intr_handler[ICU_LEN]; /* first level interrupt handler */
struct ithd *ithds[ICU_LEN]; /* real interrupt handler */
void *intr_unit[ICU_LEN];
static struct mtx ithds_table_lock; /* protect the ithds table */
static inthand_t *fastintr[ICU_LEN] = {
&IDTVEC(fastintr0), &IDTVEC(fastintr1),
&IDTVEC(fastintr2), &IDTVEC(fastintr3),
&IDTVEC(fastintr4), &IDTVEC(fastintr5),
&IDTVEC(fastintr6), &IDTVEC(fastintr7),
&IDTVEC(fastintr8), &IDTVEC(fastintr9),
&IDTVEC(fastintr10), &IDTVEC(fastintr11),
&IDTVEC(fastintr12), &IDTVEC(fastintr13),
&IDTVEC(fastintr14), &IDTVEC(fastintr15),
#if defined(APIC_IO)
&IDTVEC(fastintr16), &IDTVEC(fastintr17),
&IDTVEC(fastintr18), &IDTVEC(fastintr19),
&IDTVEC(fastintr20), &IDTVEC(fastintr21),
&IDTVEC(fastintr22), &IDTVEC(fastintr23),
&IDTVEC(fastintr24), &IDTVEC(fastintr25),
&IDTVEC(fastintr26), &IDTVEC(fastintr27),
&IDTVEC(fastintr28), &IDTVEC(fastintr29),
&IDTVEC(fastintr30), &IDTVEC(fastintr31),
#endif /* APIC_IO */
};
static unpendhand_t *fastunpend[ICU_LEN] = {
&IDTVEC(fastunpend0), &IDTVEC(fastunpend1),
&IDTVEC(fastunpend2), &IDTVEC(fastunpend3),
&IDTVEC(fastunpend4), &IDTVEC(fastunpend5),
&IDTVEC(fastunpend6), &IDTVEC(fastunpend7),
&IDTVEC(fastunpend8), &IDTVEC(fastunpend9),
&IDTVEC(fastunpend10), &IDTVEC(fastunpend11),
&IDTVEC(fastunpend12), &IDTVEC(fastunpend13),
&IDTVEC(fastunpend14), &IDTVEC(fastunpend15),
#if defined(APIC_IO)
&IDTVEC(fastunpend16), &IDTVEC(fastunpend17),
&IDTVEC(fastunpend18), &IDTVEC(fastunpend19),
&IDTVEC(fastunpend20), &IDTVEC(fastunpend21),
&IDTVEC(fastunpend22), &IDTVEC(fastunpend23),
&IDTVEC(fastunpend24), &IDTVEC(fastunpend25),
&IDTVEC(fastunpend26), &IDTVEC(fastunpend27),
&IDTVEC(fastunpend28), &IDTVEC(fastunpend29),
&IDTVEC(fastunpend30), &IDTVEC(fastunpend31),
#endif /* APIC_IO */
};
static inthand_t *slowintr[ICU_LEN] = {
&IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3),
&IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7),
&IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11),
&IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15),
#if defined(APIC_IO)
&IDTVEC(intr16), &IDTVEC(intr17), &IDTVEC(intr18), &IDTVEC(intr19),
&IDTVEC(intr20), &IDTVEC(intr21), &IDTVEC(intr22), &IDTVEC(intr23),
&IDTVEC(intr24), &IDTVEC(intr25), &IDTVEC(intr26), &IDTVEC(intr27),
&IDTVEC(intr28), &IDTVEC(intr29), &IDTVEC(intr30), &IDTVEC(intr31),
#endif /* APIC_IO */
};
static driver_intr_t isa_strayintr;
static void ithds_init(void *dummy);
static void ithread_enable(int vector);
static void ithread_disable(int vector);
static void init_i8259(void);
#ifdef PC98
#define NMI_PARITY 0x04
#define NMI_EPARITY 0x02
#else
#define NMI_PARITY (1 << 7)
#define NMI_IOCHAN (1 << 6)
#define ENMI_WATCHDOG (1 << 7)
#define ENMI_BUSTIMER (1 << 6)
#define ENMI_IOSTATUS (1 << 5)
#endif
#ifdef DEV_ISA
/*
* Bus attachment for the ISA PIC.
*/
static struct isa_pnp_id atpic_ids[] = {
{ 0x0000d041 /* PNP0000 */, "AT interrupt controller" },
{ 0 }
};
static int
atpic_probe(device_t dev)
{
int result;
if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, atpic_ids)) <= 0)
device_quiet(dev);
return(result);
}
/*
* In the APIC_IO case we might be granted IRQ 2, as this is typically
* consumed by chaining between the two PIC components. If we're using
* the APIC, however, this may not be the case, and as such we should
* free the resource. (XXX untested)
*
* The generic ISA attachment code will handle allocating any other resources
* that we don't explicitly claim here.
*/
static int
atpic_attach(device_t dev)
{
#ifdef APIC_IO
int rid;
struct resource *res;
/* try to allocate our IRQ and then free it */
rid = 0;
res = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0, ~0, 1, 0);
if (res != NULL)
bus_release_resource(dev, SYS_RES_IRQ, rid, res);
#endif
return(0);
}
static device_method_t atpic_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, atpic_probe),
DEVMETHOD(device_attach, atpic_attach),
DEVMETHOD(device_detach, bus_generic_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
{ 0, 0 }
};
static driver_t atpic_driver = {
"atpic",
atpic_methods,
1, /* no softc */
};
static devclass_t atpic_devclass;
DRIVER_MODULE(atpic, isa, atpic_driver, atpic_devclass, 0, 0);
DRIVER_MODULE(atpic, acpi, atpic_driver, atpic_devclass, 0, 0);
#endif /* DEV_ISA */
/*
* Handle a NMI, possibly a machine check.
* return true to panic system, false to ignore.
*/
int
isa_nmi(cd)
int cd;
{
int retval = 0;
#ifdef PC98
int port = inb(0x33);
log(LOG_CRIT, "NMI PC98 port = %x\n", port);
if (epson_machine_id == 0x20)
epson_outb(0xc16, epson_inb(0xc16) | 0x1);
if (port & NMI_PARITY) {
log(LOG_CRIT, "BASE RAM parity error, likely hardware failure.");
retval = 1;
} else if (port & NMI_EPARITY) {
log(LOG_CRIT, "EXTENDED RAM parity error, likely hardware failure.");
retval = 1;
} else {
log(LOG_CRIT, "\nNMI Resume ??\n");
}
#else /* IBM-PC */
int isa_port = inb(0x61);
int eisa_port = inb(0x461);
log(LOG_CRIT, "NMI ISA %x, EISA %x\n", isa_port, eisa_port);
#ifdef DEV_MCA
if (MCA_system && mca_bus_nmi())
return(0);
#endif
if (isa_port & NMI_PARITY) {
log(LOG_CRIT, "RAM parity error, likely hardware failure.");
retval = 1;
}
if (isa_port & NMI_IOCHAN) {
log(LOG_CRIT, "I/O channel check, likely hardware failure.");
retval = 1;
}
/*
* On a real EISA machine, this will never happen. However it can
* happen on ISA machines which implement XT style floating point
* error handling (very rare). Save them from a meaningless panic.
*/
if (eisa_port == 0xff)
return(retval);
if (eisa_port & ENMI_WATCHDOG) {
log(LOG_CRIT, "EISA watchdog timer expired, likely hardware failure.");
retval = 1;
}
if (eisa_port & ENMI_BUSTIMER) {
log(LOG_CRIT, "EISA bus timeout, likely hardware failure.");
retval = 1;
}
if (eisa_port & ENMI_IOSTATUS) {
log(LOG_CRIT, "EISA I/O port status error.");
retval = 1;
}
#endif
return(retval);
}
/*
* ICU reinitialize when ICU configuration has lost.
*/
void icu_reinit()
{
int i;
register_t crit;
crit = intr_disable();
mtx_lock_spin(&icu_lock);
init_i8259();
for(i=0;i<ICU_LEN;i++)
if(intr_handler[i] != isa_strayintr)
INTREN(1<<i);
mtx_unlock_spin(&icu_lock);
intr_restore(crit);
}
/*
* Create a default interrupt table to avoid problems caused by
* spurious interrupts during configuration of kernel, then setup
* interrupt control unit.
*/
void
isa_defaultirq()
{
int i;
register_t crit;
/* icu vectors */
for (i = 0; i < ICU_LEN; i++)
icu_unset(i, (driver_intr_t *)NULL);
crit = intr_disable();
mtx_lock_spin(&icu_lock);
init_i8259();
mtx_unlock_spin(&icu_lock);
intr_restore(crit);
}
/*
*initialize 8259's
*/
static void init_i8259()
{
#ifdef DEV_MCA
if (MCA_system)
outb(IO_ICU1, 0x19); /* reset; program device, four bytes */
else
#endif
outb(IO_ICU1, 0x11); /* reset; program device, four bytes */
outb(IO_ICU1+ICU_IMR_OFFSET, NRSVIDT); /* starting at this vector index */
outb(IO_ICU1+ICU_IMR_OFFSET, IRQ_SLAVE); /* slave on line 7 */
#ifdef PC98
#ifdef AUTO_EOI_1
outb(IO_ICU1+ICU_IMR_OFFSET, 0x1f); /* (master) auto EOI, 8086 mode */
#else
outb(IO_ICU1+ICU_IMR_OFFSET, 0x1d); /* (master) 8086 mode */
#endif
#else /* IBM-PC */
#ifdef AUTO_EOI_1
outb(IO_ICU1+ICU_IMR_OFFSET, 2 | 1); /* auto EOI, 8086 mode */
#else
outb(IO_ICU1+ICU_IMR_OFFSET, 1); /* 8086 mode */
#endif
#endif /* PC98 */
outb(IO_ICU1+ICU_IMR_OFFSET, 0xff); /* leave interrupts masked */
outb(IO_ICU1, 0x0a); /* default to IRR on read */
#ifndef PC98
outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */
#endif /* !PC98 */
#ifdef DEV_MCA
if (MCA_system)
outb(IO_ICU2, 0x19); /* reset; program device, four bytes */
else
#endif
outb(IO_ICU2, 0x11); /* reset; program device, four bytes */
outb(IO_ICU2+ICU_IMR_OFFSET, NRSVIDT+8); /* staring at this vector index */
outb(IO_ICU2+ICU_IMR_OFFSET, ICU_SLAVEID); /* my slave id is 7 */
#ifdef PC98
outb(IO_ICU2+ICU_IMR_OFFSET,9); /* 8086 mode */
#else /* IBM-PC */
#ifdef AUTO_EOI_2
outb(IO_ICU2+ICU_IMR_OFFSET, 2 | 1); /* auto EOI, 8086 mode */
#else
outb(IO_ICU2+ICU_IMR_OFFSET,1); /* 8086 mode */
#endif
#endif /* PC98 */
outb(IO_ICU2+ICU_IMR_OFFSET, 0xff); /* leave interrupts masked */
outb(IO_ICU2, 0x0a); /* default to IRR on read */
}
/*
* Caught a stray interrupt, notify
*/
static void
isa_strayintr(vcookiep)
void *vcookiep;
{
int intr = (void **)vcookiep - &intr_unit[0];
/*
* XXX TODO print a different message for #7 if it is for a
* glitch. Glitches can be distinguished from real #7's by
* testing that the in-service bit is _not_ set. The test
* must be done before sending an EOI so it can't be done if
* we are using AUTO_EOI_1.
*/
if (intrcnt[1 + intr] <= 5)
log(LOG_ERR, "stray irq %d\n", intr);
if (intrcnt[1 + intr] == 5)
log(LOG_CRIT,
"too many stray irq %d's; not logging any more\n", intr);
}
#ifdef DEV_ISA
/*
* Return a bitmap of the current interrupt requests. This is 8259-specific
* and is only suitable for use at probe time.
*/
intrmask_t
isa_irq_pending()
{
u_char irr1;
u_char irr2;
irr1 = inb(IO_ICU1);
irr2 = inb(IO_ICU2);
return ((irr2 << 8) | irr1);
}
#endif
/*
* Update intrnames array with the specified name. This is used by
* vmstat(8) and the like.
*/
static void
update_intrname(int intr, const char *name)
{
char buf[32];
char *cp;
int name_index, off, strayintr;
/*
* Initialise strings for bitbucket and stray interrupt counters.
* These have statically allocated indices 0 and 1 through ICU_LEN.
*/
if (intrnames[0] == '\0') {
off = sprintf(intrnames, "???") + 1;
for (strayintr = 0; strayintr < ICU_LEN; strayintr++)
off += sprintf(intrnames + off, "stray irq%d",
strayintr) + 1;
}
if (name == NULL)
name = "???";
if (snprintf(buf, sizeof(buf), "%s irq%d", name, intr) >= sizeof(buf))
goto use_bitbucket;
/*
* Search for `buf' in `intrnames'. In the usual case when it is
* not found, append it to the end if there is enough space (the \0
* terminator for the previous string, if any, becomes a separator).
*/
for (cp = intrnames, name_index = 0;
cp != eintrnames && name_index < NR_INTRNAMES;
cp += strlen(cp) + 1, name_index++) {
if (*cp == '\0') {
if (strlen(buf) >= eintrnames - cp)
break;
strcpy(cp, buf);
goto found;
}
if (strcmp(cp, buf) == 0)
goto found;
}
use_bitbucket:
printf("update_intrname: counting %s irq%d as %s\n", name, intr,
intrnames);
name_index = 0;
found:
intr_countp[intr] = &intrcnt[name_index];
}
int
icu_setup(int intr, driver_intr_t *handler, void *arg, int flags)
{
#ifdef FAST_HI
int select; /* the select register is 8 bits */
int vector;
u_int32_t value; /* the window register is 32 bits */
#endif /* FAST_HI */
register_t crit;
#if defined(APIC_IO)
if ((u_int)intr >= ICU_LEN) /* no 8259 SLAVE to ignore */
#else
if ((u_int)intr >= ICU_LEN || intr == ICU_SLAVEID)
#endif /* APIC_IO */
return (EINVAL);
#if 0
if (intr_handler[intr] != isa_strayintr)
return (EBUSY);
#endif
crit = intr_disable();
mtx_lock_spin(&icu_lock);
intr_handler[intr] = handler;
intr_unit[intr] = arg;
#ifdef FAST_HI
if (flags & INTR_FAST) {
vector = TPR_FAST_INTS + intr;
setidt(vector, fastintr[intr],
SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
}
else {
vector = TPR_SLOW_INTS + intr;
#ifdef APIC_INTR_REORDER
#ifdef APIC_INTR_HIGHPRI_CLOCK
/* XXX: Hack (kludge?) for more accurate clock. */
if (intr == apic_8254_intr || intr == 8) {
vector = TPR_FAST_INTS + intr;
}
#endif
#endif
setidt(vector, slowintr[intr],
SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
}
#ifdef APIC_INTR_REORDER
set_lapic_isrloc(intr, vector);
#endif
/*
* Reprogram the vector in the IO APIC.
*/
if (int_to_apicintpin[intr].ioapic >= 0) {
select = int_to_apicintpin[intr].redirindex;
value = io_apic_read(int_to_apicintpin[intr].ioapic,
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);
mtx_unlock_spin(&icu_lock);
intr_restore(crit);
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;
{
register_t crit;
if ((u_int)intr >= ICU_LEN || handler != intr_handler[intr])
return (EINVAL);
crit = intr_disable();
mtx_lock_spin(&icu_lock);
INTRDIS(1 << 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 */
mtx_unlock_spin(&icu_lock);
intr_restore(crit);
return (0);
}
static void
ithds_init(void *dummy)
{
mtx_init(&ithds_table_lock, "ithread table lock", NULL, MTX_SPIN);
}
SYSINIT(ithds_init, SI_SUB_INTR, SI_ORDER_SECOND, ithds_init, NULL);
static void
ithread_enable(int vector)
{
register_t crit;
crit = intr_disable();
mtx_lock_spin(&icu_lock);
INTREN(1 << vector);
mtx_unlock_spin(&icu_lock);
intr_restore(crit);
}
static void
ithread_disable(int vector)
{
register_t crit;
crit = intr_disable();
mtx_lock_spin(&icu_lock);
INTRDIS(1 << vector);
mtx_unlock_spin(&icu_lock);
intr_restore(crit);
}
int
inthand_add(const char *name, int irq, driver_intr_t handler, void *arg,
enum intr_type flags, void **cookiep)
{
struct ithd *ithd; /* descriptor for the IRQ */
int errcode = 0;
int created_ithd = 0;
/*
* Work around a race where more than one CPU may be registering
* handlers on the same IRQ at the same time.
*/
mtx_lock_spin(&ithds_table_lock);
ithd = ithds[irq];
mtx_unlock_spin(&ithds_table_lock);
if (ithd == NULL) {
errcode = ithread_create(&ithd, irq, 0, ithread_disable,
ithread_enable, "irq%d:", irq);
if (errcode)
return (errcode);
mtx_lock_spin(&ithds_table_lock);
if (ithds[irq] == NULL) {
ithds[irq] = ithd;
created_ithd++;
mtx_unlock_spin(&ithds_table_lock);
} else {
struct ithd *orphan;
orphan = ithd;
ithd = ithds[irq];
mtx_unlock_spin(&ithds_table_lock);
ithread_destroy(orphan);
}
}
errcode = ithread_add_handler(ithd, name, handler, arg,
ithread_priority(flags), flags, cookiep);
if ((flags & INTR_FAST) == 0 || errcode)
/*
* 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");
if (errcode)
return (errcode);
if (flags & INTR_FAST) {
errcode = icu_setup(irq, handler, arg, flags);
if (errcode && bootverbose)
printf("\tinthand_add(irq%d) failed, result=%d\n",
irq, errcode);
if (errcode)
return (errcode);
}
update_intrname(irq, name);
return (0);
}
/*
* 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(void *cookie)
{
return (ithread_remove_handler(cookie));
}
void
call_fast_unpend(int irq)
{
fastunpend[irq]();
}