vinu pattery wrote:
>
> Could some body let me know, how to hack the FReeBSD kernel
> to learn the exact sequence of steps which happen when the
> device driver interrupts the FreeBSD Kernel for resources.
> Is there a trace debugger available, with which i can find
> out the steps.
It's not clear what you mean by "interrupt the Kernel for
resources"... the only resources you can grab at interrupt
are things that you pre-allocated, things you get from a
zalloci() from a previously established interrupt safe zone
in the zone allocator (e.g. mbufs), and CPU time.
As far as your tracing question: "man ddb"; you can set
breakpoints in the kernel, and step through them. You
probably _don't_ want to do this in an interrupt routine,
but you could.
You may want to look at the FreeBSD Handbook, and at the
device driver and bus articles on:
http://www.daemonnews.org/
There is also a (fairly old) "Device Driver Writer's Guide":
http://freebsd.dei.uc.pt/tutorials/ddwg/ddwg.html
-- Terry
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