TLB miss handlers
Doug Rabson
dfr at nlsystems.com
Sun Jan 30 02:57:20 PST 2005
On Friday 28 January 2005 11:53, Christian Hildner wrote:
> Hi,
>
> looking at entry 0x0400 of the interrupt table I am wondering about
> the following lines:
>
> IVT_ENTRY(Instruction_TLB, 0x0400)
> mov r16=cr.ifa
> mov r17=pr
> ;;
> thash r18=r16
> ttag r19=r16
> ;;
> add r21=16,r18 // tag
> add r20=24,r18 // collision chain
> ;;
> ld8 r21=[r21] // check VHPT tag
> ^^^^^^^^^^
> Are you sure you cannot enter a nested TLB miss fault here on IA64
> implementations that do not have the VHPT walker implemented? You
> wouldn't get fault 0x0000 since there is no walker that throws that
> fault.
When I wrote this originally, I had the VHPT mapped by a TR. I believe
this is still the case.
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