Xref: news2.mv.net comp.os.msdos.djgpp:6464
From: alaric AT abwillms DOT demon DOT co DOT uk (Alaric B. Williams)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Flat Memory Questions
Date: Sat, 27 Jul 1996 13:40:59 GMT
Lines: 44
Message-ID: <838474754.7748.1@abwillms.demon.co.uk>
References: <4tb5f2$pfr AT srvr1 DOT engin DOT umich DOT edu>
NNTP-Posting-Host: abwillms.demon.co.uk
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

dbarrett AT news-server DOT engin DOT umich DOT edu (David M Barrett) wrote:

>Ok, I admit it: I've just recently started experimented with DJGPP.  But, 
>I have searched long and hard for documentation describing how to set the 
>computer into Protected Mode with the Flat Memory option but have been 
>unsuccessful. 

The whole point of DJGPP is that you don't need to set the processor
into protmode. DJGPP does it for you - almost invisibly!

> Could someone please point me to a tutorial or something 
>(or describe the process) to do this:

>1. Set the computer into PM with Flat addressing
>2. Allocate a simple "char Array[1024*1024]" (for example)
>3. Dynamically allocate memory in large chunks.

#include <alloc.h>

int main() {
   static char Array[1024*1024];
   char *block = malloc(1024*1024*10); /*10 megs enough for you?*/
   free(block);
   return 0;
}

Happy???

>I've looked around a bit through the DPMI functions, but I don't 
>understand the difference between them.  Could someone please explain 
>them to me?  Thanks!

Oh, don't worry about 'em, unless you want to write low level
interfaces...

>-David :)

ABW
--
I have become... Comfortably numb...

Alaric B. Williams Internet : alaric AT abwillms DOT demon DOT co DOT uk
<A HREF="http://www.hardcafe.co.uk/Alaric/">http://www.hardcafe.co.uk/Alaric/</A>