How to build and run Fomos in an emulator

Draft version

Dependencies

Then, the nightly version of the compiler is needed:

rustup toolchain install nightly

Additionnal components might be compiler specific, switch to the nightly version before installing them.

rustup default nightly

Fomos needs to be cross compiled. It is x86_64 only for now, add the appropriate compiler target:

rustup target add x86_64-unknown-none

On some system you need specific components. Example for my macbook air 2015.

rustup component add rust-src --toolchain nightly-x86_64-apple-darwin

rustup component add llvm-tools

The rust compiler will guide you with errors in the terminal while building.

You might need to compile it yourself with the SDL option. You can also remove SDL in the next step otherwise.

In the root of the project, execute ./build.sh. It should build all the independent apps one by one, and finally build the OS, and run it in qemu.

There are some qemu launch parameters in ./bootloader/src/main.rs

By default they suppose you have a KVM capable machine, and qemu with SDL.

If you do not have qemu with SDL replace

cmd.arg("-device").arg("virtio-vga-gl");
cmd.arg("-display").arg("sdl,gl=on");

with

cmd.arg("-device").arg("virtio-vga");

KVM is linux specific. If you do not have KVM, remove the --enable-kvm option. This makes the emulation extremely slow. Remove that:

cmd.arg("--enable-kvm");

On macOS, you can replace KVM with HVF for a fast emulation, add that:

cmd.arg("-accel").arg("hvf");