This is still work in progress.
The idea is to build the kernel as a
no_std longmode executable and then build the bootloader with the kernel ELF file in
kernel.bin. The output is a flat binary disk image (including a basic MBR) that can be run in QEMU or burned to an USB flash drive (CDs require a different kind of bootloader, which is not supported at the moment). The plan is to create a custom tool (or cargo subcommand) that performs these steps automatically.
Build and Run
If you are building on Mac OS and get a error saying
ld.bfd not found you first need to cross compile binutils and then adjust
the linker name in the
x86_64-bootloader.json file. The reason for this is the default rust LLVM linker doesn't support some features this project needs.
After doing that continue with the instructions for Linux.
> RUST_TARGET_PATH=$(pwd) xargo build --target x86_64-bootloader --release > objcopy -O binary -S target/x86_64-bootloader/release/bootloader bootimage.bin > qemu-system-x86_64 -hda bootimage.bin -d int -s