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Show HN: A DOS-like hobby OS written in Rust and x86 assembly

(github.com)
207 points krustowski | 4 comments | 19 Jun 25 13:38 UTC | HN request time: 0s | source

To try it out, simply build the project yourself from source, or use attached bootable ISO image of the system (in Releases on Github) and run it in QEMU.

https://blog.vxn.dev/rou2exos-rusted-edition

1. mixmastamyk ◴[19 Jun 25 20:38 UTC] No.44322327[source]▶
I would have preferred something like this to the current UEFI environment and shell, a FLOSS 64-bit DOS-like. A cool retro boot manager and diagnostic env perhaps.

Could this run from an efi system partition? Seems to support fat12, what about gpt?

Does it poke video hardware like DOS, or have a terminal like output?

replies(1): >>44322522 #
2. krustowski ◴[19 Jun 25 21:03 UTC] No.44322522[source]▶
Booting from an EFI system partition has not been tested yet. FAT12 is the only filesystem (ok, there is a memdisk implementation, but it won't work now) supported, so GPT is not supported at the moment too (yet). Kinda aiming for FAT32 implementation to be the very next implemented (flash disks are usually FAT32 iirc). Not sure about the last question: the OS utilizes/directly writes to the VGA buffer in memory, the provided resolution is 80x25 by GRUB.
replies(1): >>44322742 #
3. mixmastamyk ◴[19 Jun 25 21:36 UTC] No.44322742[source]▶
So MBR partitions? Or no partitions, like from a floppy? Or perhaps it doesn’t know because grub handles that part.
replies(1): >>44325788 #
4. krustowski ◴[20 Jun 25 08:53 UTC] No.44325788{3}[source]▶
For FAT12, it reads the first sector (0 or bootsector) of the floppy provided to gather information like bytes per sector, reserved sectors count, LBA of the root directory, etc.