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Add a whole lot of extra info. Lots was gained from reading code

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or comments, and some is as a result of simply documenting the
entropy harvester.

This still needs work: could a newbus guru pleazse follow up
and fix.extend my (no doubt) obvious mistakes!
This commit is contained in:
markm 2001-03-03 14:13:53 +00:00
parent 1119764552
commit 280c2396bb
1 changed files with 38 additions and 2 deletions
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40
share/man/man9/BUS_SETUP_INTR.9
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@ -29,12 +29,21 @@
.Os FreeBSD .Os FreeBSD
.Sh NAME .Sh NAME
.Nm BUS_SETUP_INTR .Nm BUS_SETUP_INTR
.Nd create and attach to an interrupt handler .Nm bus_setup_intr
.Nm BUS_TEARDOWN_INTR
.Nm bus_teardown_intr
.Nd create and attach to an interrupt handler, and teardown the attachment
.Sh SYNOPSIS .Sh SYNOPSIS
.Fd #include <sys/param.h> .Fd #include <sys/param.h>
.Fd #include <sys/bus.h> .Fd #include <sys/bus.h>
.Ft int .Ft int
.Fn BUS_SETUP_INTR "device_t dev" "device_t child" "struct resource *irq" "int flags" "driver_intr_t *intr" "void *arg" "void **cookiep" .Fn BUS_SETUP_INTR "device_t dev" "device_t child" "struct resource *irq" "int flags" "driver_intr_t *intr" "void *arg" "void **cookiep"
.Ft int
.Fn bus_setup_intr "device_t dev" "struct resource *r" "int flags" "driver_intr_t handler" "void *arg" "void **cookiep"
.Ft int
.Fn BUS_TEARDOWN_INTR "device_t dev" "device_t child" "struct resource *irq" "void **cookiep"
.Ft int
.Fn bus_teardown_intr "device_t dev" "struct resource *r" "void *cookiep"
.Sh DESCRIPTION .Sh DESCRIPTION
.Pp .Pp
The method The method
@ -43,6 +52,33 @@ will create and attach an interrupt handler to an interrupt
previously allocated by the resource manager's previously allocated by the resource manager's
.Xr BUS_ALLOC_RESOURCE 9 .Xr BUS_ALLOC_RESOURCE 9
method. method.
The
.Fa flags
are found in
.Pa sys/bus.h ,
and give the broad category of interrupt.
The
.Fa flags
also tell the interrupt handlers the about certain
device driver characteristics.
.Dv INTR_FAST
means the handler is for a timing-critical function.
Extra care is take to speed up these handlers.
Use of this implies
.Dv INTR_EXCL .
.Dv INTR_EXCL
marks the handler as being
an exclusive handler for this interrupt.
.Dv 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.
.Dv INTR_ENTROPY
marks the interrupt as being a good source of entropy -
this may be used by the entropy device
.Pa /dev/random .
The handler The handler
.Fa intr .Fa intr
will be called with the value will be called with the value
@ -58,7 +94,7 @@ in order to tear down the correct interrupt handler.
Zero is returned on success, Zero is returned on success,
otherwise an appropriate error is returned. otherwise an appropriate error is returned.
.Sh SEE ALSO .Sh SEE ALSO
.Xr BUS_TEARDOWN_INTR 9 , .Xr random 4 ,
.Xr device 9 , .Xr device 9 ,
.Xr driver 9 .Xr driver 9
.Sh AUTHORS .Sh AUTHORS