The faults are served by palcode and if that fails then the OS gets
involved. We haven't made up the fault names, they're the the ones
defined in the Alpha ISA hardware reference manual. In particular a
dtb_miss_single fault is a normal data tlb miss, and a dtb_miss_double
is a fault that happened when trying to handle a dtb_miss_single.
dtb_miss_double corresponds to a double fault, and thus requiring OS
intervention since the fast path palcode handler was unable to satisfy
the request.
Ali
On Mar 12, 2008, at 1:59 PM, abc def wrote:
One doubt: as i see from tlb.cc both PDtb_miss_fault
and NDtb_miss_fault are actually page faults which
will be served by os. My doubt is why one is called
dtb_miss_single and another is called dtb_miss_double?
Is there any specific reason for that?
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