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I made my own DOS implementation (Announce)

posted by RayeR Homepage, CZ, 01.02.2024, 19:01

> That's not technically possible. IBM PC-compatible BIOS has runtime
> services, and simple operating systems (including various DOS
> implementations) use them to access the hardware.
Yes I know. Currenly almost every DOS compatible OS rely on BIOS services. But some time ago user Tkchia presented some attempts that could lead to run something like DOS on UEFI-only machine. But he relied on legacy VGA BIOS module that is disappearing too, at least on my working-NTB so I couldn't try it out.

UEFI doesn't mean that you have to handle all the HW by yourself. UEFI offers runtime services and drivers for accessing storage (HDD, USB), keyboard and framebuffer. https://wiki.osdev.org/Using_UEFI_Runtime_Services_in_your_Kernel

But problem is that UEFI starts in 64-bit long mode (old 32-bit UEFI are probably no longer developed and supported) that makes it problematic to cooperate with realmode DOS (not sure if possible do some 16-64b mode switches safely without destrying UEFI structures). Tkchia would definitely tell you more details and how he did it. I just see he has some updates on his repo, so to have a look https://codeberg.org/tkchia/muefircate
He's quite brief here but giving some idea what is possible: https://codeberg.org/tkchia/muefircate/src/branch/main/doc/NOTES.asciidoc

---
DOS gives me freedom to unlimited HW access.

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