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From:	"Rod Pemberton" <dont_have AT bitbucket DOT cmm>
Newsgroups:	comp.os.msdos.djgpp
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Subject:	Re: Adding 64-bit file support to DJGPP
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Date:	Wed, 18 Jan 2006 21:18:16 GMT
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

"DJ Delorie" <dj AT delorie DOT com> wrote in message
news:200601182006 DOT k0IK6QbL023181 AT envy DOT delorie DOT com...
>

> under MS-DOS.

Wow!  I find it really interesting that with all the POSIX code you wrote,
and the code for POSIX-on-DOS w/DPMI of the CMU MACH DOS, that a simple
POSIX on DOS 32-bit OS couldn't be written...

I'm currently working on a personal on-top-of DOS Ring 0 OS written almost
entirely in C which (hey, there are CISC instructions...) :
1) compiles with DJGPP, and OW1.3, small amount of NASM
2) from RM, dumps the DJGPP DPMI host or the OW DPMI host/dos-extender and
returns to PM ring 0 32-bit 4Gb base 0
3) setups a new GDT and IDT
4) reprograms PICs
5) setup IRQs (rough, but there, C stack frame getting in the way for some
functions :(  )
6) implements ISRs  (proto routines for 0x31,0x21,0x33,0x16)
7) (in progress) initializes keyboard and mouse routines (working on the
buffers/queue)

I'm hoping to finish the keyboard and mouse routines soon so I can move on
to floppy/hard disk.  I'll also need to get to the PITs sometime...  With
time, it could possibly exec all DJGPP or OW programs in an exclusively
32-bit environment...  Multitasking should be possible for DJGPP
applications due to the segment memory model.  However, OW uses a single 4Gb
segment.  I'm not sure if I can get multi-tasking working for it.  I was
suprised at just how closely a large portion of my DPMI dumper code matches
the requirements for a GRUB bootloader...


Rod Pemberton

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