Date: Fri, 7 Jan 94 09:24:27 -0500
From: dj AT ctron DOT com (DJ Delorie)
To: tan AT mofet DOT elex DOT co DOT il
Cc: djgpp AT sun DOT soe DOT clarkson DOT edu
Subject: Re: Access to physical addresses from PC gcc

>
>  Hello,
> may be someone has an idea how can I access physical address from gcc in DOS.
> I tried to do it in the following code in c:
>
> #define NETBIOS_INT             0x5C
> ...
>  vector = (int ( * *)()) (NETBIOS_INT * 4);
>  if (*vector == 0L)                      /* non-0 means ISR is present */
>         {
>                 printf ("Return FALSE...\n");
>   return FALSE;
>         }
> ...
>
> I'v got the following msgs from GO32:
>
>  Segmentation violation in pointer 0x00000170 at 40:482B
>  Exeption 14 (0xe) at eip = 482B


Use dosmemget(), and pass it a physical address (not seg:ofs).