[PATCH -rt] powerpc update
sshtylyov at ru.mvista.com
Sun Oct 29 01:33:42 EST 2006
Hello, I wrote:
> 3. Do the same as x86 APIC driver does and use level/egde flows instead
> of fasteoi for the case when IRQs are threaded -- that ensues doing (2)
> as well.
Note that OpenPIC (as far as I could understand its h/w) is essentially
the same as IOAPIC/LAPIC couple on x86, i.e. a level-triggered IRQ remains
effectively globally masked until CPU writes to its local EOI reg. However,
the repetitive edge-triggered IRQ from the same line may still be detected
while being serviced on a CPU (hm, the questions is, can it be sent to any
other CPU in system while being handled on a certain CPU?)...
I hope somebody corrects me if I'm wrong about both x86 and PPC. :-)
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