From: Giacomo Catenazzi <cate@student.ethz.ch>
To: "H. Peter Anvin" <hpa@transmeta.com>
Cc: Linus Torvalds <torvalds@transmeta.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Alan Cox <alan@redhat.com>
Subject: Re: That horrible hack from hell called A20
Date: Wed, 06 Dec 2000 13:43:08 +0100 [thread overview]
Message-ID: <3A2E345C.EE6F5640@student.ethz.ch> (raw)
In-Reply-To: <fa.mnh2nkv.1kkusq6@ifi.uio.no> <fa.enh20bv.1pkea3o@ifi.uio.no>
"H. Peter Anvin" wrote:
>
>
> Good question. The whole thing makes me nervous... in fact, perhaps we
> should really consider using the BIOS INT 15h interrupt to enter
> protected mode?
>
Maybe it is better to try with INT15 AX=2400 (Enable A20 gate).
INT 15-2400 enable A20
INT 15-2401 disable A20
INT 15-2402 query status A20
INT 15-2403 query A20 support (kdb or port 92)
IBM classifies these functions as optional, but it is enabled on a lot
of
new BIOS, no know conflicts, thus we can call this function to enable
A20,
check the result and only after failure we can try the old methods.
giacomo
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next parent reply other threads:[~2000-12-06 13:13 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.mnh2nkv.1kkusq6@ifi.uio.no>
[not found] ` <fa.enh20bv.1pkea3o@ifi.uio.no>
2000-12-06 12:43 ` Giacomo Catenazzi [this message]
2000-12-06 13:01 ` That horrible hack from hell called A20 Alan Cox
2000-12-06 17:37 ` H. Peter Anvin
2000-12-05 23:30 H. Peter Anvin
2000-12-06 0:13 ` Linus Torvalds
2000-12-06 0:15 ` H. Peter Anvin
2000-12-06 1:26 ` Alan Cox
2000-12-06 0:21 ` Kai Germaschewski
2000-12-06 0:48 ` Linus Torvalds
2000-12-06 15:53 ` Richard B. Johnson
2000-12-06 18:26 ` H. Peter Anvin
2000-12-06 1:07 ` Linus Torvalds
2000-12-06 1:10 ` H. Peter Anvin
2000-12-06 1:37 ` Linus Torvalds
2000-12-06 1:41 ` Linus Torvalds
2000-12-06 2:38 ` H. Peter Anvin
2000-12-08 10:33 ` Riley Williams
2000-12-06 10:16 ` Kai Germaschewski
2000-12-06 1:25 ` Alan Cox
2000-12-06 2:05 ` H. Peter Anvin
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