linux-kernel - RE: [X86] Fix up silly i1586 boot message.

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Message-ID: <SNT125-W471F856F2358A53E59A13BC3B80@phx.gbl>
Date:	Tue, 27 Oct 2009 20:08:11 -0700
From:	Yuhong Bao <yuhongbao_386@...mail.com>
To:	<macro@...ux-mips.org>
CC:	<jengelh@...ozas.de>, <davej@...hat.com>,
	<linux-kernel@...r.kernel.org>, <mingo@...e.hu>,
	<tglx@...utronix.de>, <hpa@...or.com>
Subject: RE: [X86] Fix up silly i1586 boot message.


 <Pine.LNX.4.55.0805290102340.29522@...ff.in.clinika.pl>
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> Intel started it first with picking up a ridiculous number for the family
> ID for the P4 line. There is no technical justification for not keeping
> these numbers consecutive.=20
Well=2C the problem was that Intel has assigned family 7 for the original I=
tanium processor=2C back when Intel thought that would replace x86 (the cod=
ename for the original Itanium was P7=2C and the codename for the original =
P4 was P68). And then there was a bug in original NT 4 truncating family ID=
s returned by CPUID to 3 bits. This was not the only bug in the original NT=
 4's CPUID code=2C there was another bug relating to CX8 detection with non=
-Intel/AMD/Cyrix processors forcing the other CPU vendors to provide an opt=
ion to mask this bit=2C which caused trouble for MS itself later on when th=
ey decide they would begin to require CX8 in XP=2C and it ignores CPUID if =
max standard CPUID level is greater than 3=2C forcing Intel to again add a =
workaround into their Prescott and later processors.
Geoff Chappell wrote articles describing these problems in NT 4:
http://geoffchappell.com/viewer.htm?doc=3Dstudies/windows/km/cpu/index.htm
http://geoffchappell.com/viewer.htm?doc=3Dstudies/windows/km/cpu/cx8.htm

Yuhong Bao
 		 	   		 =20
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