Date: Sat, 20 Nov 2010 13:58:02 -0800 From: Garrett Cooper <yanegomi@gmail.com> To: freebsd-hackers@freebsd.org Cc: Andriy Gapon <avg@freebsd.org> Subject: Best way to determine if an IRQ is present Message-ID: <AANLkTi=%2ByXVrcWDC1QZLA0JWNOQjWG%2Bud_BmwiMXAMXt@mail.gmail.com>
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Trying to do a complete solution for kern/145385, Andriy has
raised concerns about IRQ mapping to CPUs; while I've have put
together more pieces of the puzzle, I'm a bit confused how I determine
whether or not an IRQ is available for use.
Sure, I could linear probe a series of IRQs, but that would
probably be expensive, and different architectures treat IRQs
differently, so building assumptions based on the fact that IRQ
hierarchy is done in a particular order is probably not the best thing
to do.
I've poked around kern/kern_cpuset.c and kern/kern_intr.c a bit
but I may have missed something important...
Thanks,
-Garrett
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