lkml.org 
[lkml]   [2000]   [Dec]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Why is double_fault serviced by a trap gate?
On Thu, Dec 07, 2000 at 04:04:21PM +0000, richardj_moore@uk.ibm.com wrote:
>
>
> Why is double_fault serviced by a trap gate? The problem with this is that
> any double-fault caused by a stack-fault, which is the usual reason,
> becomes a triple-fault. And a triple-fault results in a processor reset or
> shutdown making the fault damn near impossible to get any information on.
>
> Oughtn't the double-fault exception handler be serviced by a task gate? And
> similarly the NMI handler in case the NMI is on the current stack page
> frame?

Sounds like a good idea, when you can afford a few K for a special
NMI/double fault stack. On x86-64 it is planned to do that.


-Andi
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:51    [W:0.063 / U:0.220 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site