From: jjed AT hotmail DOT com
Newsgroups: comp.os.msdos.djgpp
Subject: Re: VDS
Date: Wed, 02 Dec 1998 15:08:18 GMT
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References: <73q651$ebj$1 AT idy05 DOT tfh-berlin DOT de> <3660720f DOT sandmann AT clio DOT rice DOT edu> <73smp7$ena$1 AT idy05 DOT tfh-berlin DOT de>
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

In article <73smp7$ena$1 AT idy05 DOT tfh-berlin DOT de>,
  "Peter Remmers" <pitti AT tfh-berlin DOT de> wrote:

Peter,

I've been trying to fix the same problem for a month now, and so far I got
the same results (VDS doesn't quite work etc).

My idea now is to do this:

1. Allocate a heap buffer with XMS and lock it (with XMS) to get the physical
address. 2. Map this physical memory to the linear memory and enable FAT DS.
3. Reuse some malloc code to make a custom malloc (i.e. phys_malloc) that
will allocate memory from this block. 4. Write some virtual_to_physical and
physical_to_virtual macros to convert between linear and physical addresses
(by simply adding/subtracring the __dpgpp_conventional_base constant).

I had limited success with 1Mb buffers and HIMEM.SYS + EMM386.EXE under plain
dos. 2Mb was impossible to "lock" (and I have 128Mb on my machine!).

Hope this helps,

James.


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