Date: Thu, 10 Jun 1999 17:03:32 +0300 (IDT)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
X-Sender: eliz AT is
To: Jay <dey AT tpts5 DOT seed DOT net DOT tw>
cc: djgpp AT delorie DOT com
Subject: Re: how to call BIOS32 service
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On 10 Jun 1999, Jay wrote:

> I got a problem. I want to call the BIOS32 service of PCI device
> ROMimage.I got the physical address of the BIOS32 sevice. But, how to
> call the BIOS32 service on protect mode? I've tested to call BIOS32
> service directly. But it always fail.
> 
>  __asm__ __volatile__( " call %%edi \n "
>                                        : "=a"( ReturnCode )

This won't work.  The `call' instruction is only valid for addresses that 
are in the CS segment, that is only for the code of your program.  BIOS32 
code is certainly outside your CS segment.  For those cases, you need to 
use `lcall', and specify the selector as well as the offset.

The above assumes that BIOS32 entry point can be called in protected 
mode; if not, you will have to use the library function called
__dpmi_simulate_real_mode_procedure_retf.