linux-kernel - Re: i387/FPU init issues...

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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@...erbug.co.uk>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Thomas Gleixner <tglx@...utronix.de>, jamal <hadi@...erus.ca>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Jan Beulich <jbeulich@...ell.com>
Subject: Re: i387/FPU init issues...

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.


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