linux-kernel - Re: [PATCH 1/10 -tip] x86: Add cpufeature for Processor Name

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Date:	Thu, 21 May 2009 13:09:06 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
CC:	"H. Peter Anvin" <hpa@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	Robert Richter <robert.richter@....com>,
	Dave Jones <davej@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	x86 maintainers <x86@...nel.org>
Subject: Re: [PATCH 1/10 -tip] x86: Add cpufeature for Processor Name

Jaswinder Singh Rajput wrote:
>>>
>> Pointless and wrong.  The presence of the processor name is not the same
>> thing as the presence of specific MSRs, which are model-specific.
>>
> 
>>>From AMD's BIOS and Kernel Developer’s Guide(BKDG) Manual :
> 
>  MSRC001_00[35:30] Processor Name String Registers
> Reset: 0000 0000 0000 0000h. These registers holds the CPUID name string in ASCII. The state of these regis-
> ters are returned by CPUID instructions, CPUID Fn8000_000[4:2]. BIOS should set these registers to the
> AMD-provided product name for the processor. Each register contains a block of 8 ASCII characters; the least
> byte corresponds to the first ASCII character of the block; the most-significant byte corresponds to the last
> character of the block. MSRC001_0030 contains the first block of the name string; MSRC001_0035 contains
> the last block of the name string.
> 
>   Bits    Description
>   63:0 CpuNameString. Read-write.
> 

Yes.  Non-AMD processors also have the brand name string in CPUID, but
set them though other means.

	-hpa
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