From:	Fullbeat <pmilani AT leonardo DOT math DOT unipd DOT it>
Newsgroups:	comp.os.msdos.djgpp
Subject:	[Fwd: VESA question in DJGPP]
Date:	Mon, 26 May 1997 12:18:51 +0200
Organization:	Seven Deadly Sins
Lines:	71
Message-ID:	<3389638B.605AB0A@leonardo.math.unipd.it>
NNTP-Posting-Host:	stud33.math.unipd.it
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

This is a multi-part message in MIME format.

--------------67A9EFC65823A707537B6E48
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

-- paolo
______________________________
Paolo Milani
University of Padova
email: pmilani AT leonardo DOT math DOT unipd DOT it

--------------67A9EFC65823A707537B6E48
Content-Type: message/news
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

Path: maya.dei.unipd.it!usenet
From: Fullbeat <pmilani AT leonardo DOT math DOT unipd DOT it>
Newsgroups: rec.games.programmer
Subject: VESA question in DJGPP
Date: Mon, 26 May 1997 11:43:52 +0200
Organization: Seven Deadly Sins
Message-ID: <33895B58 DOT 6FD507E4 AT leonardo DOT math DOT unipd DOT it>
NNTP-Posting-Host: stud33.math.unipd.it
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.01Gold (X11; I; Linux 2.0.25 i586)

I am using DJGPP 2, and want to call VBE function 4f01h (Get Vesa Info)
I declared a structure vesa_info_block following the VBE docs: I have
the #pragma pack(1) directive for this, thus enabling me to hold the
original struct size unaltered. This is for calling the real-mode
interrupt that returns infos in this fashion. 
I call the real-mode interrupt 10h through __dpmi_int, passing a
__dpmi_regs structure. Let's say I have this code:

  struct vesa_info_block buf;
  struct __dpmi_regs r;
  r.x.ax = 0x4f01;
  if (__dpmi_int(0x10,&r) == -1)
    return (ERROR);
  int rm_phys_buf = (r.x.es<<4) + r.x.di;
  dosmemget(rm_phys_buf,sizeof(vesa_info_block),&buf);


At this point the 'buf' structure should contain all infos from the int
10h call.

The problem is that only the first 2 fields look right,
signature="VESA",version=0x0102
All other fields are screwed up (eg, total vidmem reported 4376k instead
of 2048k)

Is the problem that I am not passing the buffer address to the int.10h
call?

I would be very grateful to anyone finding out a solution for this.
Also I shall want my code to be VBE 2.0 compliant (in protected mode).
Thanx in advance.


                               -- paolo
______________________________
Paolo Milani
University of Padova
email: pmilani AT leonardo DOT math DOT unipd DOT it

--------------67A9EFC65823A707537B6E48--

- Raw text -