linux-kernel - Re: [RFC, Announce] Unified x86 architecture, arch/x86

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Message-ID: <46A14D0C.7090007@zytor.com>
Date:	Fri, 20 Jul 2007 17:02:20 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Jeff Garzik <jeff@...zik.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>, Andi Kleen <ak@...e.de>,
	Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...radead.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [RFC, Announce] Unified x86 architecture, arch/x86

Alan Cox wrote:
> On Fri, 20 Jul 2007 18:38:39 -0400
> Jeff Garzik <jeff@...zik.org> wrote:
> 
>> I agree with Andi...  it's quite nice to be able to leave some arch/i386 
>> stuff, and not carry it over to arch/x86-64.
> 
> Its easy enough to push that stuff into arch/x86/legacy and have one
> subdirectory of stuff to pull in for ancient systems.

The other thing is that "legacy" in this context is fungible.  No IOMMU
was legacy until the Intel x86-64 chips came out, and I can promise you
that some legacy code will be necessary once we start seeing VIA and
others come out with embedded x86-64.

On the other hand, it's pretty bloody safe to assume that we'll never
see an x86-64 chip without CPUID, CMOV, FXSAVE, SSE-2, CMPXCHG, etc.

	-hpa
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