> <--- HIGHEST ------------------- LOWEST ---->
>
> IRQ0, 1, 8, 9, 10, 11, 12, 13, 14, 15, 3, 4, 5, 6, 7
> | | | | | | | |_ printer
> | | | | | | |____ Floppy
> | | | | | |_______ Fixed disk
> | | | | |__________ Serial 0
> | | | |_____________ Serial 1
> | | |
> | | |___________ IRQ2->IRQ8 cascade RTC
> | |______________ Keyboard
> |_________________ PIT channel 0
>
> IFF the IO-APIC is programmed to emulate the old dual controllers.
Yes, and if anyone missed this subtle point, the priorities are
programmable! There have been patches, particularly back in 2.1.120+, to
diddle priority to make marginal system work, or move the failures to
something with more robust retries.
Nice diagram, I'm taking it to a meeting (credited to you of course) where
I will be talking about interrupt use on parallel ports.
-- bill davidsen <davidsen@tmr.com> CTO, TMR Associates, Inc Doing interesting things with little computers since 1979.- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/