From mboxrd@z Thu Jan  1 00:00:00 1970
From: Rudolf Marek <r.marek@assembler.cz>
Subject: Re: [PATCH] SeaBIOS/Xen: Compute the low RAM memory size
 in the BDA according to the e820
Date: Mon, 14 Nov 2011 08:37:13 +0100
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> Unfortunately, there aren't very many places to put a hardcoded
> address.  The safest thing is probably to dynamically generate an SSDT
> with a pointer - then the DSDT can use the pointer instead of a
> hardcoded address.  This is more work, however.

You can even create an "OEM" ACPI table, with std ACPI header, but with custom 
data inside. OS will ignore it and as bonus you will have it with checksum.

Thanks
Rudolf