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

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Message-ID: <481CA63E.50504@zytor.com>
Date:	Sat, 03 May 2008 10:51:58 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	James Courtier-Dutton <James@...erbug.co.uk>
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...

James Courtier-Dutton wrote:
> 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.
> 

I believe that's what I just said...

	-hpa
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