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Writing an operating system kernel from scratch – RISC-V/OpenSBI/Zig

Writing an operating system kernel from scratch – RISC-V/OpenSBI/Zig

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·September 14, 2025
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popovicu

I have redone the classical exercise of writing a tiny OS kernel with time sharing, which manages a couple of user threads. My goal was to experiment specifically on RISC-V + OpenSBI. Additionally, I wanted to explore Zig a little bit, so that was the language used instead of the traditional C, but it should be straightforward how to do the same experiment in either C or Rust.

It's definitely very rough around the edges, and it's more of an experiment and an intro for people who want to go through step 0 of learning OS kernel development and computer architecture. Nevertheless, I hope it is still a fun experimental thing to play with over the weekend!

The full walkthrough and the GitHub link are available at the link posted!