RoBoot

My attempt at making a bootloader and kernel.

How to use

To compile, you need:

• i686-elf-gcc for cross-compiling the kernel
• A system gcc for compiling the host-helpers
• nasm for compiling the bootloader
• qemu-system-i386 for emulating (qemu-system-x86_64 will probably work too, but that is not directly supported)

If you run make bin, it will generate target/boot.bin, this is a binary file layed out as described in the docs. To burn it on a USB drive, simply dd if=target/boot.bin of=/dev/sdb and the drive is bootable and contains an SFS filesystem with the files in filesystem/.

Bootloader

The bootloader is self-written, based on articles on the OSDev wiki. It's a single stage, ELF-loading bootloader in the most basic way possible.

More info in the docs

Kernel

The kernel is based on the bare bones kernel from the OSDev wiki.

Features

• Terminal output (with newlines!)
• Very basic (and probably broken) memory management
• Interrupt handling
• Keyboard input
• Exception handling
• Minimal shell
• Filesystem interaction
  • Show files in directory
  • Read files in directory
  • Write files in directory
• Tests
• Running executables from filesystem
• Better memory management
• Better shell

As a test, I've implemented day 1 of advent of code on the AoC branch.