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

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Message-ID: <46E675E6.1040105@gmail.com>
Date:	Tue, 11 Sep 2007 16:33:02 +0530
From:	mkrameshid <mkrameshid@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Calling PnP bios routines like get device node from x86_84 arch

Hi Alan,
Thanks for your quick reply.

Actually I want to call the BIOS run time functions as per the 
PNPBIOSSpecification-v1.0a (attached).
Specifically I want to call the function no 0x0 to 0x03. I have 
Dual-Core AMD Opteron(tm) Processor 2216 and AMI BIOS with the pnp bios 
support.
So I could call this functions using the default PnP driver which comes 
along with the (API: call_pnp_bios()) i386 architecture. This driver is 
only available for i386. But not for x86_64.

So I am trying to implement a driver similar to this for x86_64 arch. 
But I couldn't .
Because there is need for get_cpu_gdt_table() which is not available in 
x86_64.
And also some inline asm needs to be totally modify for x86_64. For this

How can I achive this ? Is there any other alternate idea there instead 
of pnp driver?

Please help on this.

-mkr

Alan Cox wrote:
> 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.
>
>   

Download attachment "PNPBIOSSpecification-v1.0a.pdf" of type "application/pdf" (198965 bytes)