Rust built operating system

Details

• It's based on this wiki: https://os.phil-opp.com/freestanding-rust-binary/
• The primary goal for this is educating myself on how to operating systems work.
• The program is built with --edition 2021 using rustup. My work environment:
• • Arch Linux on x86_64 AMD Ryzen 5 3600X CPU

Building the app

In order to actually build the application,you need to define a special target value. To avoid any linker errors you need to disable the dependency for the default C runtime.

rustup target add thumbv7em-none-eabihf

cargo build --target thumbv7em-none-eabihf

• Reference: Clang LLVM

Individual OS alternative (You can ignore this.)

• Linux
• • cargo rustc -- -C link-arg=-nostartfiles
• Windows
• • cargo rustc -- -C link-args="/ENTRY:_start /SUBSYSTEM:console"
• macOS
• • cargo rustc -- -C link-args="-e __start -static -nostartfiles"

Setting the boot image.

• I highly recommend using rustup for the ease of setting up.
• • rusup default nightly
• • cargo install bootimage
• • rustup component add llvm-tools-preview
• • cargo bootimage

Getting it to run on QEMU VM

• NOTE: your terminal should be opened at the root directory at the repo.
• If it isn't, then you need to modify the file= part to your full target path.
• qemu-system-x86_64 -drive format=raw, file=target/x86_64-config/debug/bootimage-operating-system-rust.bin
• ALTERNATIVE: If your terminal is in the repo, you can just type cargo run

Writing it onto a disk (be careful!)

• (For Linux) dd if=target/x86_64-blog_os/debug/bootimage-blog_os.bin of=/dev/sdX && sync
• ^ Replace sdX with the drive/usb stick you want to write it in.
• !!! It'll delete all the data on that drive/usb stick. !!!

Other useful materials on this topic

• https://gist.github.com/cb372/5f6bf16ca0682541260ae52fc11ea3bb
• https://docs.rust-embedded.org/book/