Message-ID: <37B90B11.1270C85A@home.com>
From: Mark & Candice White <mhewii AT home DOT com>
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Newsgroups: comp.os.msdos.djgpp
Subject: Re: OS/BIOS dependencies in libc
References: <7p5j2b$akj AT newsops DOT execpc DOT com>
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Date: Tue, 17 Aug 1999 07:11:14 GMT
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Chris Giese wrote:

> I would like to find all DOS and BIOS dependencies in the libc. This
> is of interest to people writing their own OS or using GCC for
> embedded systems (no OS, maybe no BIOS).
>
> Is there a list of such functions already available? Failing that,
> what should I look for in the libc source? Maybe look for all
> occurences of "__dpmi_int"? Anything else?
>
> Thanks
>
> --
> geezer@    | Sales rushes in where
> execpc.com | Engineering fears to tread
> pmode tutorial: http://www.execpc.com/~geezer/os

This is to all who are looking into making OSs.

Though you might not find the answers to your questions,
you will find others working on similar projects at:
alt.os.assembly  and   alt.os.development

Your question also turns into a 'chicken and the egg' type
thing when you see that libc mostly boils down to OS calls.

Groman's response is right as far as my looking has went.
I use djgpp and nasm as my tools. I altered lib/djgpp.djl,
specs and wrote my own bootloader crt0 and a mostly empty
libc. This way I can compile my kernel or test apps as
'gcc kernel.c', then copy the output to my floppy and boot.

I don't have all the links I've found helpful, or any of my
code, up yet. I do have some good links on my home page
that you may find helpful.
--
Mark & Candice White
System programming hobbyists.
http://members.home.net/mhewii/welcome.htm