voltflake/os

My x86 bare-metal program that prints itself to the screen in hexadecimal notation.

⚠️ DO NOT TRY TO RUN IT ON YOUR HARDWARE! IT POTENTIALY CAN DAMAGE OR DESTROY IT. You have been warned!

😇 Although it worked properly on my old laptop and desktop pc.

Installing build tools

All operating systems, including Windows

• NASM assembler (nasm)
• LLVM toolchain (clang, llvm-objcopy, ld.lld)
• QEMU emulator (qemu-system-i386)

Make sure all tools available from PATH

Building and running project

cd src

nasm -Werror -f elf32 -o ../build/bootloader.o bootloader.s

cd ../build

clang --target=i686-pc-none-elf -c -o kmain.o ../src/kmain.c

ld.lld -T linker.ld

llvm-objcopy --set-start=0x7c00 -O binary kernel.o kernel.bin

qemu-system-i386 -drive file=kernel.bin,format=raw

To jump to C code uncomment line 138 in bootloader.s

Sources

Inside the Linux boot process