Real mode BIOS routine and Protected Mode

Question

I am doing some OS experiment. Until now, all my code utilized the real mode BIOS interrupt to manipulate hard disk and floppy. But once my code enabled the Protect Mode of the

Answer 1

The project is now an old one, but the OSKit project at Utah — which might still run on modern machines, since other late-1990s operating systems can still find the RAM and disk drives on today's PCs? — was a device-driver stack build separately from any particular operating system so that you could develop your own kernel just by writing C code.

It was kind of neat; you could compile "Hello, world." in C against OSKit and get an OS you could boot that came up and printed "Hello, world." and then halted. :-)

Anyway, if you are really doing an "OS experiment", you might want to try it out — or at least use its code as a guideline for how to get up and running with some drivers. Of course, if you're really doing less of an "OS experiment" and more of a "learn obscure facts about x86", then it might do more than you want. :-)

http://www.cs.utah.edu/flux/oskit/