Write Your Own Operating System From Scratch - Step by Step

🚀 Course Headline:

🛠️ Build your own 64-bit Operating System - for the x86 Architecture

🌍 Welcome to Write Your Own Operating System From Scratch!

Dive into the world of operating systems and learn how to create one from the ground up. This course is designed for enthusiasts and professionals alike who want to understand the inner workings of an OS, specifically tailored for the x86 architecture. By the end of this journey, you'll have a fully functional 64-bit operating system that you built with your own hands!

📚 Course Description:

In this comprehensive course, we will embark on an exciting learning path that begins with the fundamentals of the x86 architecture and delves into low-level programming. Our step-by-step approach will guide you through the process of developing a simple yet functional operating system.

Part 1: Setting the Stage

🔍 Understanding x86 Architecture

Before we can build our kernel, we must lay a solid foundation. In this part, we'll cover the essentials of the x86 architecture, including processor modes, paging, exceptions, and interrupts handling—all the critical pieces necessary for your OS to run in 64-bit mode. We'll start by preparing for mode switching from real mode to protected mode and finally to long mode, ensuring that our kernel can operate effectively in the modern computing environment.

Part 2: Crafting Your Kernel

🛠️ Building Kernel Modules

Now that we've set up the environment for a 64-bit operating system, it's time to start building core kernel modules. We'll learn how to write drivers, like a keyboard driver and a console, allowing you to interact with your OS. You'll also gain practical experience by writing a print function to display characters on the screen and creating a memory manager using x86 paging mechanisms.

• 🔹 Core Components:
  • Boot Process & Kernel Initialization
  • Memory Management with Paging
  • Handling Interrupts & Exceptions in 64-bit mode
  • Writing Kernel Code in both Assembly and C
  • Creating a Print Function for character output
  • Developing a Timer Handler for process scheduling
  • Designing a Process Manager to manage different states of processes (sleep, ready, terminated)
  • Implementing System Calls for user program interaction
  • Writing a Keyboard Driver (PS/2 interface)
  • Building a Simple Console for user-kernel interaction
  • Developing a File System Module to support reading FAT16 systems

🎉 What You Will Learn:

• Bootloader Basics: How to create and initialize a bootloader.
• Kernel Development: Writing a basic kernel in x86 assembly and C.
• System Calls: Understanding and implementing system calls for user program execution.
• Memory Management: Handling memory through paging mechanisms.
• Process Scheduling: Managing processes and their states.
• Interrupt & Exception Handling: Effectively responding to system events.
• Device Drivers: Writing a keyboard driver and console for user input.
• File System Support: Implementing a file system module to read from FAT16 systems.

🎓 By the end of this course, you will be able to:

• Develop your own 64-bit operating system tailored for the x86 architecture.
• Understand the differences and functionalities between real mode, protected mode, and long mode.
• Master handling interrupts and exceptions in a 64-bit context.
• Write OS kernel components using both assembly and C languages.
• Build and run print functions to output characters to the screen.
• Implement a memory manager using paging mechanisms for efficient memory usage.
• Create a process manager capable of scheduling processes and handling their states.
• Develop system call modules for user program interaction with the kernel.
• Write device drivers, such as a keyboard driver (PS/2 interface), and a simple console.
• Implement a file system module to support reading from FAT16 systems.

Embark on this technical odyssey today, and unlock the secrets of building an operating system from scratch! 🖥️👩‍💻🚀