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

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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>
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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

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