Messages in this thread | | | Date | Fri, 22 Jun 2001 11:32:09 -0500 | From | Timur Tabi <> | Subject | Re: For comment: draft BIOS use document for the kernel |
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** Reply to message from Alan Cox <alan@lxorguk.ukuu.org.uk> on Fri, 22 Jun 2001 17:20:33 +0100 (BST)
> Firstly a call is made to BIOS INT 15 AX=0xE820 in order to read the > E820 map. A maximum of 32 blocks are supported by current kernels. The > 'SMAP' signature is required and tested. In addition the SMAP signature > is restored each call, although not required by the specification in order > to handle some know BIOS bugs.
FYI, in OS/2, the E820 call is made only on machines with a Pentium Pro or higher, because apparently (and this is my guess) there are some motherboards out there with older CPUs that don't return a reliable result to the E820 call.
-- Timur Tabi - ttabi@interactivesi.com Interactive Silicon - http://www.interactivesi.com
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