The little book about OS development
FreeA practical guide to writing your own x86 operating system
FreeFree tier
About The little book about OS development
The little book about OS development is a free, open-source guide to writing your own x86 operating system. Authored by Erik Helin and Adam Renberg, this practical book walks through the entire process from booting and low-level assembly to C kernel code, memory management, interrupts, user mode, file systems, system calls, and multitasking. Designed for hobbyists and students, it provides a hands-on approach with code examples and links to further reading, making it a valuable resource for learning OS development fundamentals.
Key Features
Step-by-step practical guide to x86 OS development
Covers booting, assembly, and C kernel integration
Explains segmentation, paging, and virtual memory
Includes interrupts, keyboard input, and user mode
Details file system design and system calls
Covers multitasking with cooperative and preemptive scheduling
Free and open-source with PDF and online versions
Pros & Cons
Pros
- Completely free and open-source
- Practical, hands-on approach with code examples
- Covers a wide range of fundamental OS topics
- Written in a clear, tutorial-like style
- Includes links to further reading for deeper understanding
Cons
- Focuses only on x86 architecture (32-bit legacy)
- Published in 2015, some tools and references may be outdated
- Assumes basic knowledge of C and assembly programming
- Does not cover modern features like multicore, UEFI, or 64-bit
Best For
Learning operating system development from scratchBuilding hobby x86 operating systemsEducational resource for computer science coursesReference for low-level programming and kernel development
FAQ
What architecture is covered in this book?
The book focuses on x86 (32-bit) architecture.
Do I need prior experience to use this book?
The book assumes basic knowledge of C and assembly programming, but provides a step-by-step guide.
Is this book still relevant in 2025?
While published in 2015, the core concepts remain valid for learning OS fundamentals, though some tools and details may be outdated.