Date: Fri, 11 Nov 2005 18:00:24 +0000 (GMT)
From: "Maciej W. Rozycki" <macro@linux-mips.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Pavel Machek <pavel@ucw.cz>, Zachary Amsden <zach@vmware.com>,
       Andrew Morton <akpm@osdl.org>, Linus Torvalds <torvalds@osdl.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Zwane Mwaikambo <zwane@arm.linux.org.uk>,
       Pratap Subrahmanyam <pratap@vmware.com>,
       Christopher Li <chrisl@vmware.com>,
       "Eric W. Biederman" <ebiederm@xmission.com>,
       Ingo Molnar <mingo@elte.hu>
Subject: Re: [PATCH 1/10] Cr4 is valid on some 486s
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References: <200511100032.jAA0WgUq027712@zach-dev.vmware.com>
 <20051111103605.GC27805@elf.ucw.cz> <4374D99C.1080006@zytor.com>
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On Fri, 11 Nov 2005, H. Peter Anvin wrote:

> I think the 486's that have CR4 are the same that have CPUID, and thus can be
> tested for by the presence of the ID flag.

 That's correct; for our purposes a 486 that would implement CR4 but not 
CPUID would not be interesting anyway, as we don't use CR4 elsewhere but 
for features discovered through CPUID.  And I don't think there's ever 
been an implementation that had CPUID but no CR4.

  Maciej
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