From: Ralf Baechle <ralf@oss.sgi.com>
To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Cc: Carsten Langgaard <carstenl@mips.com>,
linux-mips@fnet.fr, linux-mips@oss.sgi.com
Subject: Re: [patch] MIPS64 R4k TLB refill CP0 hazards
Date: Wed, 31 Jul 2002 00:47:02 +0200 [thread overview]
Message-ID: <20020731004702.A2142@dea.linux-mips.net> (raw)
In-Reply-To: <Pine.GSO.3.96.1020730141305.16647B-100000@delta.ds2.pg.gda.pl>; from macro@ds2.pg.gda.pl on Tue, Jul 30, 2002 at 02:44:32PM +0200
On Tue, Jul 30, 2002 at 02:44:32PM +0200, Maciej W. Rozycki wrote:
> Since the handler is critical for performance, it would be desireable to
> have separate versions tuned for particular CPUs. The branch for the
> R4400 seems appropriate as it works unlike the documented code: the
> R4000/R4400 manual as available from the MIPS site states a single
> intervening instruction is needed before the last move to EntryLo and a
> "tlbwr" or "tlbwi" (see Table F-1 and F-2). So I conclude the branch is
> really a workaround for a kind of erratum or a specification change.
Nope, on R4000 four cycles are needed between the tlbwr and a eret
instruction; on the R4600 just two.
Ralf
next prev parent reply other threads:[~2002-07-30 22:45 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-29 15:23 [patch] MIPS64 R4k TLB refill CP0 hazards Maciej W. Rozycki
2002-07-29 20:10 ` Carsten Langgaard
2002-07-30 6:59 ` Carsten Langgaard
2002-07-30 11:29 ` Ralf Baechle
2002-07-30 12:09 ` Carsten Langgaard
2002-07-30 12:44 ` Maciej W. Rozycki
2002-07-30 22:47 ` Ralf Baechle [this message]
2002-07-31 11:34 ` Maciej W. Rozycki
2002-07-31 20:31 ` Ralf Baechle
2002-08-01 15:24 ` Maciej W. Rozycki
2002-08-01 17:18 ` Ralf Baechle
2002-08-02 9:32 ` Carsten Langgaard
2002-08-02 11:05 ` Ralf Baechle
2002-08-02 11:09 ` Carsten Langgaard
2002-07-30 12:39 ` Kevin D. Kissell
2002-07-30 12:39 ` Kevin D. Kissell
2002-07-31 2:05 ` Ralf Baechle
2002-07-31 7:28 ` Kevin D. Kissell
2002-07-31 7:28 ` Kevin D. Kissell
2002-07-31 11:49 ` Maciej W. Rozycki
2002-07-31 18:22 ` Ralf Baechle
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