From: richardj_moore@uk.ibm.com
To: linux-kernel@vger.kernel.org
Message-ID: <802569AE.00588787.00@d06mta06.portsmouth.uk.ibm.com>
Date: Thu, 7 Dec 2000 16:04:21 +0000
Subject: Why is double_fault serviced by a trap gate?
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Sender: linux-kernel-owner@vger.kernel.org


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?


Richard Moore -  RAS Project Lead - Linux Technology Centre (PISC).

http://oss.software.ibm.com/developerworks/opensource/linux
Office: (+44) (0)1962-817072, Mobile: (+44) (0)7768-298183
IBM UK Ltd,  MP135 Galileo Centre, Hursley Park, Winchester, SO21 2JN, UK


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