lkml.org 
[lkml]   [2002]   [May]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Q: x86 interrupt arrival after cli
On Thu, 16 May 2002, Richard B. Johnson wrote:


> <--- 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/

\
 
 \ /
  Last update: 2005-03-22 13:26    [W:0.060 / U:0.064 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site