Fiasco.OC interrupt handling

Daniel Waddington d.waddington at
Mon Jan 28 22:54:39 CET 2013

I'm now feeling a bit silly looking back at the question.  Guess what I 
really want to know is, if I set up MSI interrupts to a specific Local 
APICs (e.g. core X) should there be any issue in the kernel handling the 
interrupts on core X?


On 01/28/2013 09:55 AM, Daniel Waddington wrote:
> Hi,
> I'm looking into the interrupt handling in Fiasco.OC r.40 
> (x86/amd64).  Browsing the code, it appears that the IDT only gets set 
> up on CPU 0 and therefore on a multicore platform all interrupt 
> handling from the kernel's perspective is from core 0.  Of course the 
> user-level handlers themselves may be elsewhere.  Do I have this 
> correct or am I misunderstanding?
> Thanks,
> Daniel
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> l4-hackers mailing list
> l4-hackers at

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