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Beginners Attempt at OSDev

⚠️In progress

Alt text

Introduction

This is an attempt at understanding how computers work.
How an Operating system operates, and how it interfaces with bare metal hardware.

I'm also making a collection of detailed notes and instructions for myself, and anyone else who wants to follow along on this journey.

You can access the notes in the Instructions & Notes folder.
The notes are written in Markdown, and can be viewed on GitHub itself.

Please click here to begin reading the notes.

Environment Setup

I'm using a Windows 11 64-bit machine, and here's what you will need to get started.

  • NASM : Install this through winget using winget install nasm. This is to help us assemble our code, i.e, convert our assembly code to machine code.

  • QEMU : Install this through winget using winget install qemu, or download it from here. QEMU is essentially a Virtual Machine, and we will use it to run our boot sector and boot into our OS.

  • Preferred IDE : I'm using VSCode 💖 as it's simple and easy to use with Git. You can use any IDE you want, or even a simple text editor like Notepad++ or Sublime Text.

  • Additionally, you may create a Shell script to automatically generate your .asm file into a .bin file, and then run it on QEMU.
    I've implemented it using BASH, in a file called run.sh. You can use it by running bash run.sh <filename> in your Windows Terminal.

NOTE : You will need to have WSL installed on your machine to use this script. Also, you will need to have QEMU and NASM installed in your WSL environment as well.

Alternatively, you can use the run.bat like so: run.bat <filename>. This will generate a output.bin file and run it on QEMU.

Building the files

For sake of simplicity and convenience, I've chosen to build and run the final file in WSL.

I have included a long list of dependencies and instructions in the setup-g++-wsl.sh file in the src folder. You can run this file to install all the dependencies at once.
Just in case, the script fails, you should be able to install the dependencies by manually typing the commands one by one.

NOTE : You can simply open your current working directory inside of WSL by typing bash in the CMD.

Once the prerequisites are installed, you can proceed to run the build.sh file which will automagically build the files for you and place them in the bin folder & run them on QEMU.