From: acottrel AT magna DOT com DOT au (Andrew Cottrell)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: DJGPP for OS development?
Date: Sat, 13 Jun 1998 03:57:56 GMT
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Check out KERNEL2.ZIP by Bill Currie, it may be usefull as a starting
point.

Andrew

On 12 Jun 1998 21:30:58 GMT, aa627 AT chebucto DOT ns DOT ca (Greg McLearn)
wrote:

>	Hello, I am into the first stage of coding of my OS I am creating.
>I have hit a small problem (one of many to be, I'm sure.)  I would like to
>use the DJGPP C compiler and Assembler to code my OS since it can emit
>32-bit instructions.  Now the small snag is that DJGPP sets up its own
>protected mode environment thru the use of the DPMI server.  Since I will
>not be using a DPMI server outside of DOS (ie. in the realm of the new
>OS), I am wondering if it is possible to link in new startup code onto
>each compiled file?  I know that this can be done with such tools as
>Borland C/C++, but all I have is a 16-bit version of this.
>	Can I compile my protected mode init. code as a .O file and link
>it as the startup code?  Do other .O files contain calls to the DPMI
>functions?  What about calls to printf or the like?  Do they make calls to
>other functions which eventually call DPMI functions (or selectors that
>may or may not be the same as what I have selected for my OS?)  I'm sure
>that this has been done before.  Can anyone point me in the right
>direction (web-sites, FAQs, etc), or offer some advice?
>
>Thanks very much!
>            ____ 
>           |C:\>|                       ____________________________
>           |____|                //~\  |       Greg McLearn         |
>           _|__|_      ______/P//_  |\/|    Nova Scotia, Canada     | 
>          |oo ===|    |[*] EPSON  |  \ | aa627 AT chebucto DOT ns DOT ca   OR  |
>          |______|~~~~ -----------    \| G_MCLEAR AT bass DOT stmarys DOT ca   |
>                                       \----------------------------