Xref: news2.mv.net comp.os.msdos.djgpp:2475
From: arcanix AT aol DOT com (Arcanix)
Newsgroups: comp.os.msdos.djgpp
Subject: DPMI hosts
Date: 5 Apr 1996 00:17:38 -0500
Organization: America Online, Inc. (1-800-827-6364)
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Reply-To: arcanix AT aol DOT com (Arcanix)
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

This isn't too relevant to DJGPP, but I thought some of you might want to 
hear this anyway. It seems like some DPMI hosts are flawed
in unusual ways.  I wrote a small program that gives info about the
user's computer.  Here it is: (Note that some of the code is unused, but
was used at some point in the program's histoy).

#include <go32.h>
#include <dpmi.h>
#include <stdio.h>
#inlude <malloc.h>
#include <conio.h>

void main(void)
 {
  char *string;
  unsigned char *buff; 
  int computer;
  __dpmi_version_ret version;
     /*  unsigned char  major;
       unsigned char  minor;
       unsigned short flags;
       unsigned char  cpu;
       unsigned char  master_pic;
       unsigned char  slave_pic;        */

  printf("Total physical ram remaining: %lu\n",
_go32_dpmi_remaining_physical_memory());
  printf("Total virtual memory remaining: %lu\n",
_go32_dpmi_remaining_virtual_memory()-_go32_dpmi_remaining_physical_memory
());
  __dpmi_get_version(&version);
  printf("You are using DPMI version %u.%u\n", version.major,
version.minor);
  switch(version.cpu)
   {
    case (3) : computer=386;
	       break;
    case (4) : computer=486;
	       break;
    case (5) : computer=586;
	       break;
    }
 printf("Your CPU is a %d\n", computer);
 switch(_go32_info_block.run_mode)
  {
   case (_GO32_RUN_MODE_XMS) : string="XMS";
   break;
   case (_GO32_RUN_MODE_VCPI) : string="VCPI";
   break;
   case (_GO32_RUN_MODE_DPMI) : string="DPMI";
   break;
   case (_GO32_RUN_MODE_RAW) : string="raw";
   break;
  }
  printf("Run mode is: %s", string);
}

I then ran this program in under different DPMI hosts. The first was
CWSDPMI.
The second was borland's 32rtm extender (in resident mode, I got it from
the Doom Construction Kit v. 3.2 zipfile),and the last was windows 3.1.  
Strangely enough, the only host to return valid information
was CWSDPMI.  Both of the other ones had serious mistakes.  Anyway, here
is
the info that I got:
Field 1: Physical mem remaining.
Field 2: Virtual mem remaining (without physical, so it should be = to 
HD space remaining)
Field 3: DPMI version
Field 4: Type of CPU
Field 5: What type of host is managing memory (should always be DPMI?)

I have a Pentium Overdrive 83 with 8MB RAM (lots of TSR's) and 19 MB HD
space remaining, with DPMI version 0.9

CWSDPMI:
1: 4,771,840 
2: 19,271,680 
3: 0.90
4: 586
5: DPMI
(All readings are correct)

32rtm:
1: 3,563,520 (Must be a HUGE ram hog)
2: 4,294,926,336 (!!!!!!!!)
3: 0.90
4: 486 (Wrong)
5: DPMI

Win 3.1:
1: 954,368 (As we know, windows is a massive ram eater)
2: 31,113,216 (I am running a 5MB swap file, so this number is exactly
twice
as big as the correct amount of virtual memory)
3: 0.90
4: 486 (wrong)
5: DPMI
/-|rcanix