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Re: LL and SC instruction simulation

To: "Ralf Baechle" <>
Subject: Re: LL and SC instruction simulation
From: "Kevin D. Kissell" <>
Date: Mon, 9 Jan 2006 16:47:01 +0100
Cc: "Sathesh Babu Edara" <>, <>, <>
Original-recipient: rfc822;
References: <> <> <> <00af01c6152f$dc1863f0$10eca8c0@grendel> <> <>
> > > Is there an interface where 2.6 might be telling library code to use 
> > > system calls
> > > instead LL/SC, where the 2.4 kernel didn't?
> > 
> > No.
> And I think it's not really worth it.  MIPS II did introduce ll/sc in
> 1991 and it was becoming widely available with MIPS III and some pseudo-
> MIPS II R3000 variants also in the embedded markets and MIPS32/MIPS64
> were based on that.  So ll/sc-less processors are a very small part of
> the market of Linux/MIPS these days, not really worth to optimize for.

Hmm.  I can think of at least one *very* high volume MIPS Linux platform still
manufactured by a very large Japanese electronics company where LL/SC
either isn't implemented or doesn't work...  


            Kevin K.

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