BUS_SETUP_INTR, bus_setup_intr, BUS_TEARDOWN_INTR, bus_teardown_intr --
create, attach and teardown an interrupt handler
BUS_SETUP_INTR(device_t dev, device_t child, struct resource *irq,
int flags, driver_intr_t *intr, void *arg, void **cookiep);
bus_setup_intr(device_t dev, struct resource *r, int flags,
driver_intr_t handler, void *arg, void **cookiep);
BUS_TEARDOWN_INTR(device_t dev, device_t child, struct resource *irq,
bus_teardown_intr(device_t dev, struct resource *r, void *cookiep);
The method BUS_SETUP_INTR 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 the 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 interrupt
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 establishing
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.
Zero is returned on success, otherwise an appropriate error is returned.
random(4), device(9), driver(9)
This manual page was written by Jeroen Ruigrok van der Werven
<asmodai@FreeBSD.org> based on the manual pages for BUS_CREATE_INTR and
BUS_CONNECT_INTR written by Doug Rabson <dfr@FreeBSD.org>.
FreeBSD 5.2.1 March 28, 2003 FreeBSD 5.2.1 [ Back ]