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From:	Rugxulo <rugxulo AT gmail DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: freedos and cwsdpmi with djgpp under Linux?
Date:	Mon, 17 Aug 2009 15:00:46 -0700 (PDT)
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Hi,

On Aug 17, 7:39=A0pm, "rickbron DOT  DOT  DOT  AT gmail DOT com" <rickbron DOT  DOT  DOT  AT gmail DOT com>
wrote:
>
> I built a djgpp app using a debian Linux version of djgpp (gcc version
> 4.2.2) inhttp://www.by.kernel.org/pub/debian-cosy/dists/lenny/local/binar=
y-i386/
> =A0 The end of my Makefile looks like:
> =A0 =A0 =A0 =A0 i386-pc-msdosdjgpp-stubify $(PROJ).exe
>
> =A0 My CONFIG.SYS is:
>
> DOS=3DHIGH
> BUFFERS=3D20
> FILES=3D30
> LASTDRIVE=3DZ
> STACKS=3D9,256
>
> =A0 I run "cwsdpmi.exe -p" then run my app but it can't find XMS, this
> command fails:

This isn't really related, but I wonder why everyone always wants to
run the DPMI server resident beforehand, esp. since DJGPP apps will
load it as necessary anyways. In other words, I never do that, I just
let the stub load CWSDPMI (found in my %PATH%) if needed.

> regs.x.ax =3D 0x4300; =A0/* EXTENDED MEMORY SPECIFICATION (XMS) v2+ -
> INSTALLATION CHECK */
> __dpmi_simulate_real_mode_interrupt(0x2f, &regs);

Right, you didn't have XMS loaded.

> =A0 If I add this to my CONFIG.SYS:
>
> DEVICE=3DHIMEM.SYS
>
> =A0 The above passes but when I try to alloc memory via:
>
> regs.x.ax =3D 0x0900; =A0/* Allocate extended memory block */
> regs.x.dx =3D size_pg_align / XMS_BLOCK;
> __dpmi_simulate_real_mode_procedure_retf(&regs);
>
> =A0 it fails. =A0Can anyone shed some light on this?

CWSDPMI is probably hogging all the RAM. If you use EMM386, it will
use paging and this won't happen. Try JEMM386.

http://www.japheth.de/Jemm.html

P.S. I wonder if you know why you're trying to use XMS. Typically
that's unnecessary. DJGPP is tightly integrated with pmode, C/C++
(mostly), and DPMI. Anything else is doing something a bit odd. (Are
you trying to use DMA or something like that??)

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