Re: Race betwen the NMI handler and the RTC clock in practially allkernels

[linux-os]

On Mon, 25 Oct 2004, Corey Minyard wrote:

> According to the comments in 2.4, this code causes the NMI to be re-asserted 
> if another NMI occurred while the NMI handler was running.  I have no idea 
> how twiddling with these CMOS registers causes this to happen, but that is 
> supposed to be the intent.  I don't think it has anything to do with delays.
>
> I would like to know what this code really does before removing it.
>
> -Corey
>
> Andi Kleen wrote:

NMI is supposed to be turned OFF if the high-bit in the index
register is set. It is turned back ON if it is reset.


Cheers,
Dick Johnson
Penguin : Linux version 2.6.9 on an i686 machine (5537.79 GrumpyMips).
                 98.36% of all statistics are fiction.
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