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bus_teardown_intr
BUS_SETUP_INTR(9) FreeBSD Kernel Developer's Manual BUS_SETUP_INTR(9)
NAME
BUS_SETUP_INTR, bus_setup_intr, BUS_TEARDOWN_INTR, bus_teardown_intr --
create, attach and teardown an interrupt handler
SYNOPSIS
#include <sys/param.h>
#include <sys/bus.h>
int
BUS_SETUP_INTR(device_t dev, device_t child, struct resource *irq,
int flags, driver_intr_t *intr, void *arg, void **cookiep);
int
bus_setup_intr(device_t dev, struct resource *r, int flags,
driver_intr_t handler, void *arg, void **cookiep);
int
BUS_TEARDOWN_INTR(device_t dev, device_t child, struct resource *irq,
void *cookiep);
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_RESOURCE(9) method. The flags are found in <sys/bus.h>, and
give the broad category of interrupt. The flags also tell the interrupt
handlers about certain device driver characteristics. INTR_FAST means
the handler is for a timing-critical function. Extra care is take to
speed up these handlers. Use of this implies INTR_EXCL. 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 inter-
rupt as being a good source of entropy - this may be used by the entropy
device /dev/random. The handler intr will be called with the value arg
as its only argument.
The cookiep argument is a pointer to a void * that BUS_SETUP_INTR() will
write a cookie for the parent bus' use to if it is successful in estab-
lishing an interrupt. Driver writers may assume that this cookie will be
non-zero. The nexus driver will write 0 on failure to 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.
SEE ALSO
random(4), device(9), driver(9)
AUTHORS
This manual page was written by Jeroen Ruigrok van der Werven
<asmodaiATFreeBSD.org> based on the manual pages for BUS_CREATE_INTR() and
BUS_CONNECT_INTR() written by Doug Rabson <dfrATFreeBSD.org>.
FreeBSD 6.2 January 6, 2005 FreeBSD 6.2
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