linux-kernel - Re: Calling PnP bios routines like get device node from x86

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Date:	Mon, 10 Sep 2007 17:33:44 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	PnP driver <mkrameshid@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Calling PnP bios routines like get device node from x86_84 arch

On Mon, 10 Sep 2007 08:06:20 -0700 (PDT)
PnP driver <mkrameshid@...il.com> wrote:

> 
> Hi,    
>       I am very new to linux kernel driver development. I need to develop a 
> driver for calling  BIOS routines like get device node. I could  call  it
> in i386 architecture using the PnP driver. 

We use ACPI on AMD64 so you should be parsing the ACPI tables not trying
to rely on legacy interfaces which if I rememeber the spec rightly aren't
even guaranteed safe to call when ACPI is active.

What are you actually trying to achieve.

>      But in x86_64 arch I couldn't see any support. Even I tried to
> implement it similar to the i386. But there is no API get_cpu_gdt_table().
> Is there any other way to get the cpu_gdt_table? or any other way to 
> call the BIOS routines.

Assuming you even have a BIOS - you may have EFI underlying or
Linuxbios or be a virtual machine.
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