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From: "H. Peter Anvin" <hpa@zytor.com>
To: Andi Kleen <ak@suse.de>
Cc: Chuck Ebbert <76306.1226@compuserve.com>,
	Andrew Morton <akpm@osdl.org>, Ingo Molnar <mingo@elte.hu>,
	Linus Torvalds <torvalds@osdl.org>,
	linux-kernel@vger.kernel.org
Subject: Re: [patch] i386: early pagefault handler
Date: Wed, 05 Jul 2006 09:38:56 -0700	[thread overview]
Message-ID: <44ABEB20.2010702@zytor.com> (raw)
In-Reply-To: <p73veqcp58s.fsf@verdi.suse.de>

Andi Kleen wrote:
> 
>> +hlt_loop:
>> +	hlt
> 
> There are still supported i386 CPUs that don't support HLT and
> would recursively fault here.
> 

The HLT has been supported since 8086.  However, it was broken in some 
early 486s (not 386s); that's what the test in the kernel is for.

I don't remember what the failure mode was, though; didn't think it was 
recursive faulting.

	-hpa

  reply	other threads:[~2006-07-05 16:39 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-07-05 11:44 [patch] i386: early pagefault handler Chuck Ebbert
2006-07-05 11:47 ` Ingo Molnar
2006-07-05 13:10 ` Andi Kleen
2006-07-05 16:38   ` H. Peter Anvin [this message]
2006-07-05 16:54     ` Linus Torvalds
2006-07-05 18:28       ` Alan Cox
2006-07-05 18:26         ` H. Peter Anvin
2006-07-05 18:41         ` Linus Torvalds
2006-07-05 20:24 ` Linus Torvalds
2006-07-07  2:06 ` Daniel Phillips
2006-07-07  2:51   ` H. Peter Anvin

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