Date: Fri, 28 Jan 2005 12:53:17 +0100 From: Christian Hildner <christian.hildner@hob.de> To: freebsd-ia64@FreeBSD.org Subject: TLB miss handlers Message-ID: <41FA27AD.4030208@hob.de>
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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.
Christian
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