linux-kernel - Re: Please teach me X86 I/O port 0x61

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Date:	Thu, 15 Jul 2010 09:07:46 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	tanaka <tanaka_hideo@...oo.co.jp>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Please teach me X86 I/O port 0x61

On Fri, 16 Jul 2010 00:00:36 +0900 (JST) tanaka wrote:

> Dear all.
> 
> I investigate about  NMI kernel messages.
> Linux kernel read 0x61 address using inb(61h).
> 
> I search a amd opteron cpu following manuals.
> but I do not find  explanation of 0x61 address.
> 
> http://support.amd.com/us/psearch/Pages/psearch.aspx?type=2.1&product=2.1.4&contentType=Tech+Doc+Processor&ostype=&keywords=&items=20
> 
> Could you teach me a 0x61 address of X86 arch >

Hi,

IO port 0x61 (NMI Status & Control register) is not CPU-specific on x86.
It's more of a platform thing.

Intel describes it in ICH (chipset) specs, e.g., ICH7 spec,
section 10.7.1.  Please try that and see if it answers your questions.

---
~Randy
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