rCore

To my knowledge, there’s nothing on RISC‑V that’s equivalent to WOS in the "from‑scratch, bare‑metal bring‑up" sense (MMU, interrupt controller, exception levels, etc.). However, there are several advanced Rust projects on RISC‑V, but they focus on higher‑level OS features rather than the low‑level hardware bring‑up. For instance: - rCore — teaching OS in Rust: https://github.com/rcore-os/rcore - TockOS — Rust microkernel with RISC‑V support: https://github.com/tock/tock - RustSBI — SBI runtime (not an OS): https://github.com/rustsbi/rustsbi - xv6-riscv-rust — Rust port of xv6: https://github.com/garentyler/xv6-riscv These projects are more "advanced" in terms of OS features (processes, syscalls, userland), but none of them do the full low‑level bring‑up that WOS does on ARM64 (not to what I know of). So the space is still

rcore-os [0] uses a rust-lang port of zircon [1], the kernel that fuschia-os uses. zircon isn't quite a microkernel, but is pretty close to one [2]. FreeRTOS [3] bundles in a microkernel [4]. Speaking of FreeRTOS, you may also be interested in Riot OS developer's blog entry on building a (micro?) kernel [5]. [0] https://github.com/rcore-os/rCore [1] https://github.com/rcore-os/zCore [2] https://archive.is/Y49Ih [3] https://github.com/FreeRTOS/FreeRTOS-Kernel [4] https://archive.is/u8Hsw [5] https://archive.is/0MHF1