Date: Sun, 30 Jan 2005 10:57:07 +0000 From: Doug Rabson <dfr@nlsystems.com> To: freebsd-ia64@freebsd.org Subject: Re: TLB miss handlers Message-ID: <200501301057.08334.dfr@nlsystems.com> In-Reply-To: <41FA27AD.4030208@hob.de> References: <41FA27AD.4030208@hob.de>
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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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