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Date:	Wed, 02 Nov 2005 14:56:28 -0500
From:	Diego Cueva <dcueva AT todo1 DOT com>
Subject:	RE: RE: Why the call instruction points 2 bytes before to the real
	start sub-routine
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To:	djgpp AT delorie DOT com
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Hi:
Thanks again for your response:

The IPL program is working fine in botting time (not O.S. present).
Booting from a diskette. The IPL is mounted to the first sectors of the
diskette using rawrite tool. In VMWARE is working too. IPL is coded in
assembler, and I can call SW interrupts, 0x13 for disk, 0x10 for video
and so on. The IPL works fine.

In the last hours I read documents about switching 32 bits mode, these
is very complex for the purpose, and in this way, please, tell me what
16-bit "C" compiler (decent whit support) I can use for write a small
Operating System for educational purposes?

Thanks for your time.


Att.
Diego Cueva.

-----Original Message-----
From: Hans-Bernhard Broeker [mailto:broeker AT physik DOT rwth-aachen DOT de] 
Sent: Wednesday, November 02, 2005 12:53
To: djgpp AT delorie DOT com
Subject: Re: Why the call instruction points 2 bytes before to the real
start sub-routine ?

Diego Cueva <dcueva AT todo1 DOT com> wrote:

> com file not are my final objective. My Objective is creating a small
> operating system to educational purposes, and I need compile C
programs
> with GCC that can execute in booting time.

In that case, .com files are not just not your final goal, they're not
even likely to be particularly useful as a stepping stone getting there.

Code compiled by the DJGPP version of GCC strictly assumes a DPMI-like
environment.  You'ld have to recreate basically all of a DPMI server,
and large parts of DOS, before this code will run reliably.  To get an
idea of what that means, have a good look at the CWSDPMI sources.

It might end up being easier to embed FreeDOS, CWSDPMI and your
program into a single binary image, instead.

> To this moment I have a IPL program with a group small routines in
> assemble compiled/linked with "as/ld". This is working fine. 

Working fine in what kind of environment?  Called from DOS?

> But link that with C compiled code is the WALL to climb now.

Exactly.  Wherein "WALL" is not just some bedroom wall or something
--- it's more like the Eiger North side.

-- 
Hans-Bernhard Broeker (broeker AT physik DOT rwth-aachen DOT de)
Even if all the snow were burnt, ashes would remain.


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