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Overview

Course Description

This course is designed to teach you how to create your very own multitasking operating system and kernel from scratch. It is assumed you have no experience in programming kernels and you are taught from the ground up.

Real Mode Development

Real mode is a legacy mode in all Intel processors that causes the processor to start in a legacy state, it performs like the old 8086 Intel processors did back in the way.

In the "Real Mode Development" section of the course we start by learning about the boot process and how memory works, we then move on to creating our very own boot loader that we test on our real machine! This boot loader will output a simple "Hello World!" message to the screen and we write this boot loader in purely assembly language.

In this section we also read a sector(512 bytes) from the hard disk and learn all about interrupts in real mode and how to create them.

This section gives you a nice taster into kernel development, without over whelming you with information. You are taught the basics and enough about the legacy processors to be able to move forward to more modern kernel development further into this course.

Protected Mode Development

In this section we create a 32 bit multi-tasking kernel that has the FAT16 filesystem. Our kernel will use Intel's built in memory protection and security mechanisms that allow us to instruct the processor to protect our kernel and prevent user programs from damaging it.

This section is very in depth, you are taught all about paging and virtual memory. We take advantage of clever instructions in Intel processors to allow all processes to share the same memory addresses, this is known as memory virtualization. We map memory addresses to point to different physical memory addresses to create the illusion that every process that is running is loaded at the same address. This is a very common technique in kernel development and is also how swap files work (Those files that are used to compensate for when you run out of usable RAM).

We create our own virtual filesystem layer that uses a design that is similar to the Linux kernel. This clever abstraction that will be taught to you was inspired by the instructors knowledge of writing Linux kernel drivers in his past.

You are taught about the design of the FAT16 filesystem and how the FAT16 filesystem is broken down into clusters and that they can chain together. We then implement our very own FAT16 filesystem driver allowing files to be born!

We implement functionality for tasks and processes and write our own keyboard drivers.

In this course you also get to learn how memory management works, we implement the "malloc" and "free" functions creating our very own heap that's designed to keep track of what memory is being used. Memory management is essential in any operating system and kernel.

Let us not forget that we even create an ELF file loader, we will compile all our operating systems programs into ELF files and allow the loading of binary programs or ELF programs. ELF files contain a lot of information that describes our program for example where our program should be loaded into memory and the different sections of the program.

By the end of this course you will have a fully functioning 32 bit multi-tasking kernel that can have many processes and tasks running at the same time. You will have a working shell that we can use as well.

Assembly language bonus

This is a bonus section designed to bring your assembly skills up to scratch should you struggle a little bit with the assembly language in this course. It's however advised you come to this course with experience in assembly language, we do use it and its important. Never the less if you want to take a chance on this course with no assembly experience then this section will help point you in the right direction so your able to take what you learned and apply it to the kernel.


Taught by an expert that that has created Linux kernel modules professionally in the work place.

What you'll learn

  • How to create a kernel from scratch

  • How to handle malicious or problematic programs in your operating system. Terminating them if they misbehave.

  • The difference between kernel land, user land and the protection rings that make up modern computing

  • You will learn all about virtual memory and how to map virtual addresses to physical addresses

  • You will learn how to load ELF files

  • You will learn how to debug your kernel in an emulator with GDB.

  • How to create a multi-tasking kernel

  • How memory works in computers

  • Kernel design patterns used by the Linux kernel its self

  • You will learn how to make the kernel understand processes and tasks

  • You will learn how to debug disassembled machine code

Requirements

  • Understanding the C programming language

  • Understanding Assembly Language

Who this course is for

  • People who want to develop a kernel from scratch

Course Content


About the instructor

Daniel McCarthy
  • 4.85 Instructor Rating
  • 10 Reviews
  • 339 Students
  • 13 Courses

Daniel McCarthy

Dragon Zap Instructor

I am a software engineer that has been programming for 14+ years. My experience is vast and covers web development all the way to compiler and interpreter development. I have also developed bootloaders and kernels that can boot from the FAT(File Allocation Table) filesystem.
I have developed two programming languages of my own. One is called Craft language. The other is called Marble which is a web language like PHP. I am currently developing a C compiler.
I have experience in the following programming languages: C, C++, Java, x86 Assembly language, PHP, HTML5, JAVASCRIPT, CSS, Craft, Marble
I also have programmed Linux kernel modules professionally in the workplace.
These days I am focused on providing my years of expertise to students to help them grow as professional software engineers.

Student feedback

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Course Rating

Reviews

Review by Martina Milkov

Martina Milkov

I could never grasp paging until this course. Thank you!

Review by Arthur Verberkt

Arthur Verberkt

An absolute must for people who focus on kernel development !!

Review by Nibble Bits

Nibble Bits

Well explained. I like the hands-on approach as well as detailed explanation during the process.

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    Course Features

  • Lectures 135
  • Duration 28 hours
  • Skill level All levels
  • Language English
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