Re: [PATCH] Mutilated form of Andi Kleen's AMD prefetch errata patch

[H. Peter Anvin]

Followup to:  <p73pthiyu0e.fsf@xxxxxxxxxxxxxxxx>
By author:    Andi Kleen <ak@xxxxxxx>
In newsgroup: linux.dev.kernel
> 
> I implemented it for long mode on x86-64.
> 
> It has to be done before the vesafb is initialized too, otherwise
> you cannot see the error message.
> 
> You could copy the code from arch/x86_64/boot/setup.S 
> (starting with /* check for long mode. */) and change it to
> check for the CPUID bits you want. x86-64 checks a basic collection
> that has been determined to be the base set of x86-64 supporting CPUs.
> But it could be less or more.
> 

Do it in boot/setup.S so that you can still issue a message via the
BIOS.  However, don't forget you might need bug fixes/workarounds like
the P6 SEP in there, too.  From that perspective it would be nice to
have something that can be written in C.  Recent binutils actually
allow gcc-generated .s-files to be assembled for a 16-bit environment
(with lots of overrides.)

	-hpa
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