Re: For comment: draft BIOS use document for the kernel

From: Timur Tabi (ttabi@interactivesi.com)
Date: Fri Jun 22 2001 - 11:32:09 EST

Next message: Rob Landley: "Re: Controversy over dynamic linking -- how to end the panic"
Previous message: James Simmons: "Re: [PATCH] fbgen & multiple RGBA"
In reply to: Alan Cox: "For comment: draft BIOS use document for the kernel"
Next in thread: Brad Pepers: "Re: For comment: draft BIOS use document for the kernel"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

** 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

- 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/

Next message: Rob Landley: "Re: Controversy over dynamic linking -- how to end the panic"
Previous message: James Simmons: "Re: [PATCH] fbgen & multiple RGBA"
In reply to: Alan Cox: "For comment: draft BIOS use document for the kernel"
Next in thread: Brad Pepers: "Re: For comment: draft BIOS use document for the kernel"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

This archive was generated by hypermail 2b29 : Sat Jun 23 2001 - 21:00:39 EST