linux-kernel - Re: i686 quirk for AMD Geode

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Date:	Wed, 11 Nov 2009 10:21:36 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Willy Tarreau <w@....eu>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Pavel Machek <pavel@....cz>,
	Avi Kivity <avi@...hat.com>,
	Matteo Croce <technoboy85@...il.com>,
	Sven-Haegar Koch <haegar@...net.de>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: i686 quirk for AMD Geode


> So in my opinion, we should have :
>   - CMOV (for 486, Pentium, C3, K6, ...)
>   - NOPL (newcomer)
> 
> And if we want to extend down to i386 :
>   - BSWAP (=htonl)
>   - CMPXCHG (mutex)
>   - XADD (never encoutered but cheap)
> 
> I still have the 2.4 patch for BSWAP, CMPXCHG, CMOV and XADD lying

If we go that far it needs a lot more thought and probably to use the KVM
code simply because of all the complexities around prefixes and the like

(Not of course that the real CPUs are consistent either)

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