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Write Your Own Operating System From Scratch - Step by Step (Udemy.com)

Build your own 64-bit operating system - for the x86 architecture

4.4

428 reviews

Created by: x-BIT Development

Last updated February 2026

What you will learn

Be able to build a simple operating system for the x86 architecture.
Understand real mode
Understand protected mode and long mode
How to handle interrupts and exceptions in the 64-bit mode
How to write OS kernel with the assembly code and C code
Be able to write print function to print characters on the screen
Be able to build a memory manager using x86 paging mechanism
How to write timer handler for the process manager
How to build a process manager to schedule processes and change them among different states (sleep, ready, killed)
How to implement system call module to make user programs running in the system
Write a keyboard driver (PS/2)
Write a simple console and interact with OS kernel using commands
Be able to write a simple file system module which supports reading fat16 system.

How it compares

Against the other 1,182 rated Udemy courses in IT & Software on CourseDuck:

Rating4.4 out of 5higher than 30% of them
Reviews428#618 of 1,183 by number of reviews
Length10.1 hourslonger than 71% of them
Last updatedFebruary 2026more recently than 67% of them

Course Description

Welcome to write your own 64-bit operating system course.
This course teaches you how to build a simple operating system from scratch. It covers basics about the x86 architecture and low-level programming. In this course, we will take you through the process of building a small working system step by step.
The first part of the course teaches all you need to know (processor modes, paging, exceptions and interrupts handling, etc.) before you can build the kernel on the x86 architecture. In this part, we will see how to prepare for mode switching. We switch from real mode to protected mode and then jump to long mode. Our kernel is running in 64-bit mode. After we switch to 64-bit mode, we will see how to handle exceptions and interrupts, how to switch between kernel mode and user mode.
The second part of the course teaches you how to build kernel modules such as processes, memory management, interrupt handling, etc. In this part, we will see how to write a keyboard driver and a console, how to interact with the OS kernel using the console. After finishing this part, you should know how to write user programs and make them run in your own operating system.
In this course you will learn: How to build a simple operating system for the x86 architecture. Understand real mode Understand protected mode and long mode How to handle interrupts and exceptions in the 64-bit mode How to write OS kernel with the assembly code and C code Be able to write print function to print characters on the screen Be able to build a memory manager using x86 paging mechanism How to write timer handler for the process manager How to build a process manager to schedule processes and change them among different states (sleep, ready, killed) How to implement system call module to make user programs running in the system Write a keyboard driver (PS/2) Write a simple console and interact with OS kernel using commands Be able to write a simple file system module which supports reading fat16 system.
At the end of the course, you should be able to develop your own 64-bit operating system.
Who this course is for:
Students who learned the operating system concepts and want to put them into practiceStudents curious about the fundamental mechanisms used in the OSPeople who want to build a hobby OS but don't know how and where to start

All Levels

Time: 10.1h

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Instructor Details

x-BIT Development

4.4 Rating
428 Reviews

x-BIT Development was created to help anyone learn low-level programming and gain a better understanding of how things work.
We currently focus on making high quality courses on assembly languages, operating systems and more. Our goal is to teach programming in an easy and effective way, which helps students to get the most out of our courses.