linux-kernel - Re: Assignment of GDT entries

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Message-ID: <450863CA.3000005@goop.org>
Date:	Wed, 13 Sep 2006 13:02:18 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Arjan van de Ven <arjan@...radead.org>,
	Linus Torvalds <torvalds@...l.org>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@...e.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Zachary Amsden <zach@...are.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Michael A Fetterman <Michael.Fetterman@...cam.ac.uk>
Subject: Re: Assignment of GDT entries

Alan Cox wrote:
> Ar Mer, 2006-09-13 am 21:16 +0200, ysgrifennodd Arjan van de Ven:
>   
>> I don't know the exact details on these; I do know that several GDT
>> entries tend to be used by BIOSes in their APM implementations and thus
>> are better of not being used.
>>     
>
> Thats 0x40 which tends to get used as if was a real mode base for BIOS
> accesses even via the protected mode interface.
>   

Do you mean descriptor entry 8?  Because that's TLS #3, not reserved...

    J
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