Content-class: urn:content-classes:message
MIME-Version: 1.0
Content-Type: text/plain;
	charset="us-ascii"
Content-Transfer-Encoding: 8BIT
Subject: Reading BIOS information from a kernel driver
Date: Wed, 9 Nov 2005 15:35:30 -0500
Message-ID: <4A3725E53DCF3E4B9D5C63880C3F980055B493@mail2.networkengines.com>
Thread-Topic: Reading BIOS information from a kernel driver
Thread-Index: AcXlbSAEKh1rVl22TdedRvA8Rx7DiQ==
From: "Steven Schveighoffer" <StevenS@NetworkEngines.com>
To: <linux-kernel@vger.kernel.org>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 899
Lines: 25

I am trying to read a string that the BIOS has placed into memory.

The BIOS placed the string into memory at real-mode address F000:FA00
(i.e. physical address FFA00h).

1. Is there a linear address which always contains this address
location?  i.e. if there is a spot where I can do:

char * mystring = (char *)0xMagicAddress;

2. If not, how do I map a linear address to this physical address so I
can read it?

I'm pretty sure that the string can be read, but I would prefer to know
exactly where the string is located before looking.  For example, the
following command finds the string:

dd if=/proc/kcore bs=1024 count=3000 | grep mystring

-Steve
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/