KFS-1

Discover the world of "Kernel Programming" and learn how to create your very own Kernel from scratch.

This project is the first in a serie of 10 projects, introducing into the Kernel world. This first project is a very basic kernel with some features.

Is based on a i386 (x86) architecture.

Options:

• Color support
• Keyboard handler
• Helper 'printk'
• Scroll and cursor support
• Different screens helper and keyboard shortcut
• Create Iso image from kernel binary

Shortcuts:

• F1: go to previous screen
• F2: go to next screen

TODO:

• Cursor in position before changing screen (actually, it's going to end of buffer)
• Fix deletion for \n and \t
• Clean code for .h please
• Store files in different folders (in src/kernel)
• Control deletion on terminal (keep in memory the last char that can be deleted)
• Check for TODO in code

NB: you can use the dependencies.txt to install all necessaries packages. sudo apt/dnf install $(cat dependencies.txt)

KERNEL

Compilation

Simple way

make

Hard way

$ nasm -f elf32 boot.asm -o boot.o
$ gcc -m32 -c kernel.c -o kernel.o
$ ld -m elf_i386 -T link.ld -o [your kernel name] boot.o kernel.o

It is recommended to name your kernel with the formal: kernel-<version>. I named mine "kernel-kfs.1.rleseur".

Run on QEMU

Simple way

make run-kernel

Hard way

qemu-system-i386 -kernel [your compiled kernel]

Installation

• Take the last Debian ISO and make a VM in virtualbox.

• Clone the repo in it.

• Copy the compiled kernel in /boot directory.

• Modify the /boot/grub/grub.cfg and add an entry:

menuentry 'My Kernel' {
	set root='hd0,msdos1'
	multiboot /boot/[your compiled kernel] ro
}

• Reboot and select My Kernel entry.

ISO

Compilation

Simple way

make iso

Hard way

$ mkdir -p /iso/boot/grub
$ cp [your compiled kernel] /iso/boot
$ cp grub.cfg /iso/boot/grub
$ grub-mkrescue -o [your iso name] iso

Run on QEMU

Simple way

make run-iso

Hard way

qemu-system-i386 -cdrom [your iso]

Resources

• The BIBLE, for basic kernel: https://arjunsreedharan.org/post/82710718100/kernels-101-lets-write-a-kernel

• The BIBLE 2, for keyboard: https://arjunsreedharan.org/post/99370248137/kernels-201-lets-write-a-kernel-with-keyboard

• For keyboard scancodes: https://aeb.win.tue.nl/linux/kbd/scancodes-1.html

• For another system of keyboard, color and build iso image: https://theogill.medium.com/creating-a-kernel-from-scratch-1a1aa569780f

• To move the cursor: https://hasinisama.medium.com/building-your-own-operating-system-drivers-8adfc889398b