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SubjectRe: installing an ISR from user code
At 17:23 30/10/2000, Brett Smith wrote:
>We have written a char driver for our proprietary h/w. This driver
>handles a multitude of interrupts from the h/w in the following
>fashion: The ISR reads/saves the status register (indication of which int
>was hit) in
>global, and the marks the BH to run. The BH uses the global to call one
>of 32 "ISRs" (an array of func ptrs). I would like to be able to
>install an "ISR" dynamically from user code (the module has already been
>installed). Is this possible?
>If it is possible, how does the build/link work?

Of course it is possible. - There are drivers out there doing similar
things. - Unfortunately while the one I actually know is open source the
program attaching to this driver is not open source so you can only see the
kernel side of the solution. )-:


Gunzip/Untar the archive and look in the Barbados/kernelmode directory in
the file quasar.c. - In that file you will find the implementation of some
IOCTLs and the one you will find most interesting is IOCTL_SEND_PID which
is used for the purpose of registering a user space ISR with the kernel
mode driver.

This concept can easily be extended by another passed in argument
containing which ISR to register with this call or you could do them all at
once whatever suits you.

Hope this helps.



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