BUS_SETUP_INTRbus_setup_intrBUS_TEARDOWN_INTRbus_teardown_intr
- create, attach and teardown an interrupt handler
SYNOPSIS
#include <sys/param.h>
#include <sys/bus.h> int
Fo BUS_SETUP_INTR
Fa device_t dev device_t child struct resource *irq int flags
Fa driver_filter_t *filter driver_intr_t *ithread void *arg
Fa void **cookiep
Fc Ft int
Fo bus_setup_intr
Fa device_t dev struct resource *r int flags
Fa driver_filter_t filter driver_intr_t ithread void *arg
Fa void **cookiep
Fc Ft int
Fo BUS_TEARDOWN_INTR
Fa device_t dev device_t child struct resource *irq void *cookiep
Fc Ft int
bus_teardown_intr (device_t dev struct resource *r void *cookiep);
DESCRIPTION
The
BUS_SETUP_INTR ();
method
will create and attach an interrupt handler to an interrupt
previously allocated by the resource manager's
BUS_ALLOC_RESOURCE9
method.
The
Fa flags
are found in
In sys/bus.h ,
and give the broad category of interrupt.
The
Fa flags
also tell the interrupt handlers about certain
device driver characteristics.
INTR_EXCL
marks the handler as being
an exclusive handler for this interrupt.
INTR_MPSAFE
tells the scheduler that the interrupt handler
is well behaved in a preemptive environment
(``SMP safe''),
and does not need
to be protected by the ``Giant Lock'' mutex.
INTR_ENTROPY
marks the interrupt as being a good source of entropy -
this may be used by the entropy device
/dev/random
To define a time-critical handler (previously known as
INTR_FAST
that will not execute any potentially blocking operation, use the
Fa filter
argument.
Otherwise, use the
Fa ithread
argument.
The defined handler
will be called with the value
Fa arg
as its only argument.
The
Fa cookiep
argument is a pointer to a
Vt void *
that
BUS_SETUP_INTR ();
will write a cookie for the parent bus' use to if it is successful in
establishing an interrupt.
Driver writers may assume that this cookie will be non-zero.
The nexus driver will write 0 on failure to
Fa cookiep .
The interrupt handler will be detached by
BUS_TEARDOWN_INTR (.);
The cookie needs to be passed to
BUS_TEARDOWN_INTR ();
in order to tear down the correct interrupt handler.
Once
BUS_TEARDOWN_INTR ();
returns, it is guaranteed that the interrupt function is not active and
will no longer be called.
Mutexes are not allowed to be held across calls to these functions.
RETURN VALUES
Zero is returned on success,
otherwise an appropriate error is returned.
An -nosplit
This manual page was written by
An Jeroen Ruigrok van der Werven
Aq asmodai@FreeBSD.org
based on the manual pages for
BUS_CREATE_INTR ();
and
BUS_CONNECT_INTR ();
written by
An Doug Rabson
Aq dfr@FreeBSD.org .
