Learn to write your first OS kernel

mkernel

This is a minimalist kernel which prints " my first kernel " on the screen and then hangs.

• The kernel is multi-boot compliant and loads with GRUB.

Blog post

Kernel 101 – Let’s write a Kernel

Build commands

nasm -f elf32 kernel.asm -o kasm.o

gcc -m32 -c kernel.c -o kc.o

ld -m elf_i386 -T link.ld -o kernel kasm.o kc.o

Test on emulator

qemu-system-i386 -kernel kernel

Get to boot

GRUB requires your kernel executable to be of the pattern kernel-<version> .

So, rename the kernel:

mv kernel kernel-701

Copy it to your boot partition (assuming you are superuser):

cp kernel-701 /boot/kernel-701

Configure your grub/grub2 similar to what is given in _grub_grub2_config folder.

Reboot.

Voila!

The next step

See mkeykernel repo