Messages in this thread | | | Date | Thu, 7 Dec 2000 17:13:53 +0100 | From | Andi Kleen <> | Subject | Re: Why is double_fault serviced by a trap gate? |
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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.
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