From: Ralf Baechle <ralf@linux-mips.org>
To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Cc: Mike Uhler <uhler@mips.com>, Dominic Sweetman <dom@mips.com>,
linux-mips@linux-mips.org
Subject: Re: [patch] Use XKPHYS for 64-bit TLB flushes
Date: Thu, 9 Jan 2003 02:36:01 +0100 [thread overview]
Message-ID: <20030109023601.A1213@linux-mips.org> (raw)
In-Reply-To: <Pine.GSO.3.96.1030108210002.11293A-100000@delta.ds2.pg.gda.pl>; from macro@ds2.pg.gda.pl on Wed, Jan 08, 2003 at 09:12:03PM +0100
On Wed, Jan 08, 2003 at 09:12:03PM +0100, Maciej W. Rozycki wrote:
> Well, like it or not, CAMs do not like multiple matches -- up to a
> physical damage even. So they should be avoided if possible. While KSEG0
> won't match for any real address translation, there is a non-zero
> probability of executing a tlbp for it as a result of buggy code or
> execution gone wild (root running crashme?).
I'm told the TLB Shutdown bit in the R4000 is basically implemented as an
overcurrent protection. That is on many chips even a hit on several
entries won't cause a tlb shutdown until the matches do result in the
TLB drawing more than a certain current.
A tlbp on a KSEG0 address shouldn't happen. If it's attempted we already
have worse problems.
Ralf
next prev parent reply other threads:[~2003-01-09 1:36 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-08 13:27 [patch] Use XKPHYS for 64-bit TLB flushes Maciej W. Rozycki
2003-01-08 13:59 ` Ralf Baechle
2003-01-08 19:02 ` Dominic Sweetman
2003-01-08 19:18 ` Maciej W. Rozycki
2003-01-08 19:33 ` Mike Uhler
2003-01-08 19:33 ` Mike Uhler
2003-01-08 19:44 ` Ralf Baechle
2003-01-08 20:12 ` Maciej W. Rozycki
2003-01-09 1:36 ` Ralf Baechle [this message]
2003-01-09 20:10 ` Carsten Langgaard
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