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Message-ID: <481CA5FC.6020004@superbug.co.uk>
Date: Sat, 03 May 2008 18:50:52 +0100
From: James Courtier-Dutton <James@superbug.co.uk>
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To: "H. Peter Anvin" <hpa@zytor.com>
CC: Thomas Gleixner <tglx@linutronix.de>, jamal <hadi@cyberus.ca>,
       Suresh Siddha <suresh.b.siddha@intel.com>,
       Arjan van de Ven <arjan@linux.intel.com>, Ingo Molnar <mingo@elte.hu>,
       LKML <linux-kernel@vger.kernel.org>, Jan Beulich <jbeulich@novell.com>
Subject: Re: i387/FPU init issues...
References: <1209810775.6972.37.camel@localhost> <alpine.LFD.1.10.0805031650120.6003@apollo.tec.linutronix.de> <481CA40A.7040906@zytor.com>
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H. Peter Anvin wrote:
> Thomas Gleixner wrote:
>>
>> Jan, are you sure that P3 knows the P6 NOPs ? AFAICT its P4, but I
>> have to dig up the manuals.
>>
>
> Pentium III is the P6 core, so it will.
>
> Intel explicitly documents "all processors with family 6 or F."
>
> -hpa

 From the intel manual

0F 1F /0 NOP
The multi-byte form of NOP is available on processors with model encoding:
• CPUID.01H.EAX[Bytes 11:8] = 0110B or 1111B
The multi-byte NOP instruction does not alter the content of a register 
and will not
issue a memory operation. The instruction’s operation is the same in 
non-64-bit
modes and 64-bit mode.