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From: "Charles Sandmann" <cwsdpmi AT earthlink DOT net>
Newsgroups: comp.os.msdos.djgpp
References: <1137560452 DOT 398133 DOT 301490 AT g14g2000cwa DOT googlegroups DOT com> <0ed77a97-aec8-4fde-8124-707ca9cffad1 AT googlegroups DOT com> <28c2ff16-6cef-46c3-8f52-f67b320b5c04 AT googlegroups DOT com>
Subject: Re: Adding 64-bit file support to DJGPP
Date: Thu, 23 May 2013 20:19:52 -0500
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

>"RayeR" <glaux AT centrum DOT cz> wrote in message 
>news:28c2ff16-6cef-46c3-8f52-f67b320b5c04 AT googlegroups DOT com...
>When talking about UEFI, how hard would be to modify DJGPP to use UEFI API 
>instead of DOS/BIOS calls?

First, does DOS boot?  DJGPP depends completely on DOS for file system 
support and most of the system calls.

Mostly DJGPP requires DOS calls (and memory data structures); BIOS calls are 
mostly when the user needs them.
DJGPP also requires a DPMI provider; CWSDPMI also depends on DOS calls.

Any major update is equivalent to or larger than the DJGPP V2 effort, which 
took a couple of years and many
man months of programming effort.