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Re: MIPS32 patches breaking DecStation

To: "Ralf Baechle" <>
Subject: Re: MIPS32 patches breaking DecStation
From: "Kevin D. Kissell" <>
Date: Tue, 9 Jan 2001 21:33:12 +0100
Cc: "Harald Koerfgen" <>, <>
References: <> <> <> <019901c07a72$94d19f00$0deca8c0@Ulysses> <>
> > Yes, it's cute, but it relies on accidents of implementation to work,
> > and could easily fail on other CPUs otherwise compatible with
> > the R4000.  In principle, such a branch might incur no delay at
> > all on an advanced 64-bit processor.  By all means, use it for
> > the specific cases of the CPUs on which it is known to work,
> > but it should not be used in "default" MIPS CP0 handlers.
> This behaviour of the R4000 branch is documented in the R4000 manual's
> description of the pipeline.

Yes, yes, like I said, use it whenever you see an R4000 PrID
if you like.  Just don't use it as the handler installed for a PrID
not otherwise known to the kernel.

            Kevin K.

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