From: Rene Herman <rene.herman@gmail.com>
To: Bart Trojanowski <bart@jukie.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: how to tell linux (on x86) to ignore 1M or memory
Date: Fri, 20 Apr 2007 21:01:01 +0200 [thread overview]
Message-ID: <46290DED.80500@gmail.com> (raw)
In-Reply-To: <20070419141804.GO32620@jukie.net>
On 04/19/2007 04:18 PM, Bart Trojanowski wrote:
> I need to preserve some state from the bios before entering protected
> mode. For now I want to copy it into some ram accessible by real-mode,
> say the last megabyte visible in real-mode.
>
> What's the easiest way to have linux ignore the megabyte starting at 15M?
Note that real-mode can only access the first megabyte (*) and not the first
16. 16MB is the 16-bit protected mode (286) limit.
(*) well, the first 1M + 64K - 16 bytes using segment FFFF assuming A20 is
enabled and x > 1 in x86...
Rene.
next prev parent reply other threads:[~2007-04-20 19:03 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-19 14:18 how to tell linux (on x86) to ignore 1M or memory Bart Trojanowski
2007-04-19 14:30 ` Paolo Ornati
2007-04-20 19:01 ` Rene Herman [this message]
2007-06-22 1:46 ` H. Peter Anvin
2007-06-22 13:16 ` Rene Herman
[not found] <8bFEz-3B4-39@gated-at.bofh.it>
[not found] ` <8c6EE-4Jj-5@gated-at.bofh.it>
2007-04-20 21:39 ` Bodo Eggert
[not found] ` <8yGrK-4vX-7@gated-at.bofh.it>
[not found] ` <8yRnb-4XE-23@gated-at.bofh.it>
2007-06-22 23:00 ` Bodo Eggert
2007-06-22 23:04 ` Rene Herman
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