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Kernel From Scratch

This is a project for the 42 school where we have to build a whole kernel starting from scratch. We have to use a x86 architecture and a bootloader to load the kernel into the machine (or the emulator).

Progress

  • Boot the kernel
  • Print some text to the screen
  • Manage colors
  • Load a GDT
  • Load an IDT and setup PICs
  • Manage keyboard (using interrupts)
  • Add a small shell with a few commands (clear, lsmmap, shutdown, reboot...)
  • Manage exceptions (using interrupts)
  • Enable paging, and manage memory (physical and virtual addresses).
  • Setup Higher half kernel

Dependencies

Tested only under Ubuntu, but it should work on any system that is using apt.

The setup script will install the following dependencies:

  • build-essential (a basic compiler, make and everything needed to build a cross compiler)
  • nasm
  • all the dependencies for compiling gcc

But it will not install qemu, grub or xorriso. You have to install them yourself if you want to run the kernel.

Usage

First, run the setup script:

./setup.sh

Then, you can make the kernel:

make
  • Then, depending on your needs, you can run the kernel:
make run_curses #if you want to run the kernel in curses mode
make run_gtk #if you want to run the kernel in gtk mode (requires gtk3)
make run_debug #if you want to run the kernel in debug mode (then you have to use gdb, using the `debug` target)
make run_monitor #if you want a detached monitor (to another terminal, then you have to connect to it using the `monitor` target, or use the `telnet <ip> 1234` command)

Example pictures

A little walkthrough of the kernel

Useful links

It contains a lot of useful information about the x86 architecture and os development in general.