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Subject: Re: [RFC 1/6] x86, NMI, Add symbol definition for NMI magic
 constants
From: Peter Zijlstra <peterz@infradead.org>
To: Huang Ying <ying.huang@intel.com>
Cc: Ingo Molnar <mingo@elte.hu>, "H. Peter Anvin" <hpa@zytor.com>,
        linux-kernel@vger.kernel.org, Andi Kleen <andi@firstfloor.org>
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Date: Fri, 10 Sep 2010 22:37:07 +0200
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On Fri, 2010-09-10 at 10:51 +0800, Huang Ying wrote:
> +       return inb(NMI_REASON_PORT);

I've always wondered, where is this magic stuff documented?