Re: Bios

Rik van Riel (
Mon, 18 May 1998 19:26:28 +0200 (MET DST)

On Sun, 17 May 1998, Marinus wrote:

> Bios calls under Linux a big no no ?

Linux runs in Protected Mode and is multitasking and
somewhat reentrant. BIOS runs in real-mode, and it's
functions are non-reentrant. This means you can't do
anything else while the BIOS function runs. Plus you
have to switch back and forth between real and PM...

> recently I tried this on 2.0.33 & 2.1.102
> mov eax,13h
> int 10h

You tried to call DOS assembly from Linux userspace?!?

> as a little test, might it not work due to Linux virtualizing the ports
> ?
> Is it always a good idea to let the kernel dictate port usage ?

YES! Unless you run in an exokernel environment, and even
there the port usage should be left to specialized code...

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