inb parameter physical/Virtual.

Hi all,

I am into writing Linux device drivers. I have a query regarding usage
of inb, outb instruction in the drivers.

What is the address we need to pass to inb, oub instructions? I mean, Is
it a Physical address or a Virtual address?


Regards,
Mukund jampala








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Re: inb parameter physical/Virtual.

On Apr 12, 2005 10:51 AM, Mukund JB. wrote:
>
> Hi all,
>
> I am into writing Linux device drivers. I have a query regarding usage
> of inb, outb instruction in the drivers.
>
> What is the address we need to pass to inb, oub instructions? I mean, Is
> it a Physical address or a Virtual address?
>
> Regards,
> Mukund jampala

No,
It is I/O port address. It is different from Memory address. In x86,
I/O Port addresses are 16bit.

Regards
Manish Regmi

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