#riscv #sbi #rustsbi

no-std rustsbi

Minimal RISC-V's SBI implementation library in Rust

23 releases

0.3.2 Feb 26, 2023
0.3.1 Jan 20, 2023
0.3.0 Nov 3, 2022
0.3.0-alpha.2 Jul 21, 2022
0.0.2 Oct 20, 2020

#102 in Embedded development

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282 downloads per month

MulanPSL-2.0 OR MIT



RISC-V Supervisor Binary Interface (SBI) library in Rust; runs on M-mode or HS mode.

crates.io Documentation License

Binary downloads

Most users would get RustSBI binary download from the RustSBI Prototyping System. Check out the link here to download binary package for your platform.

Boards, SoC vendors and research groups would provide dedicated RustSBI package for supported platforms. There are packages exists on awesome-rustsbi: it is a curated list of awesome things related to RustSBI, which includes some implementation projects maintained by individuals or the community.

Users on commercial boards may visit implementation specific distribution links depending on the platforms they need, or consult vendors if they provide discrete RustSBI package support.

Minimum supported Rust version

To compile RustSBI library, you need at least stable Rust version of rustc 1.65.0.

If you are using feature singleton or legacy to support legacy SBI extensions, you are required to install nightly Rust compiler. You may need at least nightly Rust version of rustc 1.59.0-nightly (c5ecc1570 2021-12-15).

Build this project

RustSBI is usually used as a library or dependency. If you wish to, you may build RustSBI library itself using the following command:

# If you don't have the cross compile target installed, install it first
rustup target add riscv64imac-unknown-none-elf
# Build this project as library
cargo build --target riscv64imac-unknown-none-elf

The build should finish without any errors.

If you see any error like invalid register a0: unknown register, it's likely that you cross built this project into platforms other than RISC-V. RustSBI adapts to RISC-V SBI interface, so you may cross build this project into any bare metal RISC-V platform targets instead.

The target platform of RustSBI is usually a bare metal target. Under normal circumstances these targets in Rust would start with riscv??- and end with -none-elf. If a non-bare metal target is built to, it would throw build error in riscv dependency crate or RustSBI library itself.


  • Feature rich and extensible operating system runtime
  • Empower support, compatibility for machines, hypervisors and emulators
  • Support to and develop with RISC-V SBI specification v2.0-rc1
  • Written in Rust, builds under stable Rust
  • Capable to develop with other firmware ecosystem projects
  • Adapted for operating system kernel models on your choice

Frequently asked questions

  1. How would I build a RustSBI implementation?

RustSBI have extensive documents on such purposes! No matter what you are building with it, you will find some documents about RustSBI on bare-metal environments, hypervisors and emulators.

Check it out at RustSBI document main page.

  1. Can I use RustSBI on C based kernels?

Yes, you can! RustSBI strictly follows RISC-V SBI standard. All features are prepares for all programming languages, as long as they support RISC-V SBI defined calling convention.

If your kernel language supports other SBI implementations, usually it will support RustSBI in the same way.

Talks and documents

This project is originally a part of rCore Summer of Code 2020 activities, inspired by MeowSBI and other similar projects. Now it is capable of running rCore-Tutorial and other OS kernels on wide supported RISC-V devices.

There are multiple talks related to RustSBI dated back to Aug 2020. These talks discuss from design and abstraction of RustSBI modules, to actual production and research usage scenario related to RustSBI and RISC-V bootloaders. Public slides and blog articles of these talks are available at RustSBI/slides page.

Notes on platform implementation

  1. RustSBI should be used as a library. Under normal circumstances, RustSBI platform can be implemented with embedded Rust's embedded-hal libraries.
  2. Contributions are welcomed! We welcome to implement and test RustSBI for both FPGA cores and real cores. Implementations for emulators are also welcomed. If you are ready, start your own binary project and use RustSBI in it!
  3. If there is a bug in RustSBI project itself, fire an issue or pull request to let us know!

This project is licensed under either of

Documents from RISC-V SBI Specification are used in this project. These documents are (C) RISC-V Foundation under Creative Commons Attribution 4.0 International License (CC-BY 4.0). The full license text is available at https://creativecommons.org/licenses/by/4.0/.