Booloader

Bootloader from Udemys: "Developing a Multithreaded Kernel From Scratch!" course

Prerequisites

Install cross platform gcc with no dependencies on native libraries, visit this page for more info: https://wiki.osdev.org/GCC_Cross-Compiler
sudo apt install nasm
sudo apt install qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils

make

qemu-system-x86_64 -hda ./bin/os.bin

or

./run.sh

Ctrl+a and then c to exit

Note : 16 bit code debugging didn't work for me, just 32-bit protected mode

Run gdb and then:

target remote | qemu-system-x86_64 -hda ./bin/os.bin -S -gdb stdio

This will stop before the first instruction (thanks to -S flag). You can now setup breakpoint to any address

Older version of the bootloader in 'real' mode can be found in 'old' folder