linux-kernel - Re: [PATCH -tip 1/2 resend] x86, nmi: Define a name for NMI control port

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Date:	Wed, 02 Mar 2011 22:49:19 +0300
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Don Zickus <dzickus@...hat.com>
CC:	Ingo Molnar <mingo@...e.hu>, "Huang, Ying" <ying.huang@...el.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -tip 1/2 resend] x86, nmi: Define a name for NMI control
 port

On 03/02/2011 10:35 PM, Don Zickus wrote:
> On Wed, Mar 02, 2011 at 06:32:30PM +0300, Cyrill Gorcunov wrote:
>> Also add a comment anout why we need in-out operations.
>>
>> Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
>> ---
>>
>> Ingo I hope this time I've resolved MUA space injection.
>>
>>  arch/x86/include/asm/mach_traps.h |   18 +++++++++++++-----
>>  1 file changed, 13 insertions(+), 5 deletions(-)
>>
>> Index: linux-2.6.git/arch/x86/include/asm/mach_traps.h
>> =====================================================================
>> --- linux-2.6.git.orig/arch/x86/include/asm/mach_traps.h
>> +++ linux-2.6.git/arch/x86/include/asm/mach_traps.h
>> @@ -8,6 +8,7 @@
>>  #include <asm/mc146818rtc.h>
>>
>>  #define NMI_REASON_PORT		0x61
>> +#define NMI_ENABLE_PORT		0x70 /* Real-Time Clock Address Register as well */
>>
>>  #define NMI_REASON_SERR		0x80
>>  #define NMI_REASON_IOCHK	0x40
>> @@ -30,12 +31,19 @@ static inline void reassert_nmi(void)
>>  		old_reg = current_lock_cmos_reg();
>>  	else
>>  		lock_cmos(0); /* register doesn't matter here */
>> -	outb(0x8f, 0x70);
>> -	inb(0x71);		/* dummy */
> 
> I was wondering if 0x71 should get a name change too.  Then again I can't
> find the Intel doc that tells me what 0x70 is either (I remember seeing it
> somewhere).
> 
> Cheers,
> Don

  Well, me specs are on another machine (which I didn't copied back yet :) but
if my memory doesn't betray me it can be found in ICH specification. For 0x71 i
simply don't remember how it's named in spec but it stands for RTC ram target
register iirc.

-- 
    Cyrill
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