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    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
    -
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