linux-kernel - Re: [PATCH][RFC] exception processing in early boot

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Message-ID: <Pine.LNX.4.61.0608301304230.13331@chaos.analogic.com>
Date:	Wed, 30 Aug 2006 13:15:07 -0400
From:	"linux-os \(Dick Johnson\)" <linux-os@...logic.com>
To:	"Andi Kleen" <ak@...e.de>
Cc:	<pageexec@...email.hu>, "Willy Tarreau" <w@....eu>,
	<Riley@...liams.name>, <davej@...hat.com>,
	"Linux kernel" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][RFC] exception processing in early boot

On Wed, 30 Aug 2006, Andi Kleen wrote:

>
>> Even the i286 and the 8086 support hlt. Is there some Cyrix chip that
>> you are trying to preserve? I think even those all implimented
>> hlt as well.
>
>
> According to the kernel code it's
>
> char    hlt_works_ok;   /* Problems on some 486Dx4's and old 386's */
>
> I don't know more details about what these problems were.
>
> -Andi
>

Oh yes. There were some buggy chips that would not let an interrupt
take the CPU out of hlt! However, what's wanted here is a hard-stop
which you get even with buggy chips because an interrupt won't
awaken them.

Cheers,
Dick Johnson
Penguin : Linux version 2.6.16.24 on an i686 machine (5592.62 BogoMips).
New book: http://www.AbominableFirebug.com/
_
..

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