Hermit Kernel

This is the kernel of the Hermit unikernel project.

Requirements

• rustup
• NASM (only for SMP on x86_64)

Building the kernel

Usually the kernel will be linked as static library to your applications.

• Rust applications: Instructions can be found in the hermit-rs repository.
• For C/C++ applications: Instructions can be found in the hermit-playground repository.

Standalone static library build

cargo xtask build --arch x86_64

On completion, the script will print the path of libhermit.a. If you want to build the kernel for aarch64, please replace x86_64 by aarch64.

Control the kernel messages verbosity

This kernel uses the lightweight logging crate log to print kernel messages. The environment variable HERMIT_LOG_LEVEL_FILTER controls the verbosity. You can change it by setting it at compile time to a string matching the name of a LevelFilter. If the variable is not set, or the name doesn't match, then LevelFilter::Info is used by default.

$ HERMIT_LOG_LEVEL_FILTER=Debug cargo xtask build --arch x86_64

Credits

This kernel is derived from following tutorials and software distributions:

1. Philipp Oppermann's excellent series of blog posts.
2. Erik Kidd's toyos-rs, which is an extension of Philipp Opermann's kernel.
3. The Rust-based teaching operating system eduOS-rs.

HermitCore's Emoji is provided for free by EmojiOne.

License

Licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

The kernel is being developed on hermitcore/kernel. Create your own fork, send us a pull request, and chat with us on Zulip.