brundlefly
An unholy marriage of UEFI and Rust. It doesn't actually do much, it's just a PoC of a basic EFI executable in Rust. Inspired by @charliesome's rustboot.
Prerequisites
This build process will only work on OS X. You'll need a couple of tools to build this monstrosity - namely mtoc from Apple's cctools package, and GenFw from the EFI Development Kit.
cctools used to pretty easy to build, but it doesn't work for me at the moment. Easiest way I've found is just to install it from brew:
$ brew tap henrik-muehe/homebrew-hyper
$ brew install cctools
The EDK2 BaseTools package doesn't seem to build properly with my current toolchain either. I've had various issues with it in the past, but we can easily patch the Makefile to make it build. Check out the EDK2, patch the Makefile so it works, and build the BaseTools:
$ git clone https://github.com/tianocore/edk2
$ cd edk2/BaseTools/Source/C
$ perl -pi -e 's/-fno-merge-constants//g' Makefiles/header.makefile
$ make
It might error out, but it should have already built the one tool we need.
Whatever the path to the EDK2 is you'll need to note down and pass it to make. I have it in ~/code/ext/edk2.
If you want to run this in qemu you'll need to install it:
$ brew install qemu
Of course, you'll also need the Rust toolchain. I build it from source.
Building
Once you have the pre-reqs ready, you should be able to build with just a make in the brundlefly dir, passing it the path to the EDK:
$ make EDK2=~/code/ext/edk2
You should now have brundlefly.efi in the build directory.
Running
If you have qemu installed you can run with:
$ make run
This uses an included binary of OVMF borrowed from here.