A student has built an entire operating system from scratch in C . Yes, you read that right! Meet Banan OS, a hobbyist operating system for x86_64 and i686 architectures, written entirely in C by an university student Oskari Alaranta. The project is fully independent, with all code written exclusively by Alaranta, except for any ported software.

In this blog post, we will look at the technical details of Banan OS. We’ll also discuss what motivated its creator to build an entire operating system from scratch. Lastly, we’ll talk about the challenges he faced during the process.

Table of Contents

What is Banan OS?

Banan OS is an Unix-like operating system designed for x86 and x86_64 architectures. Believe it or not, Oskari Alaranta, a self-taught programmer and student, has developed the entire Banan OS from scratch in C . It’s truly impressive work!

Banan OS features a monolithic kernel and a number of essential components, including a bootloader, kernel, and userspace libraries. What sets Banan OS apart is its use of a custom C standard library, partially inspired by stdc , and its robust support for modern hardware and software needs.

The system already provides a functional TTY and GUI environment, alongside key UNIX utilities like cp, ls, and stat. It supports USB devices, NVMe and AHCI disks, and even includes a custom networking stack with TCP and UDP capabilities.

With a UNIX-like filesystem featuring /dev, /tmp, and /proc, Banan OS is more than a learning project — it’s a step toward a complete, standalone operating system.

Alaranta noted that he regularly tests Banan OS both in virtual machines and on real hardware.

Motivation

Oskari Alaranta has dedicated over two years to developing Banan OS. His primary motivation appears to be a strong interest in low-level programming, particularly operating system development.

This passion is reflected in his decision to write the entire OS from scratch in C , excluding ported software.

Challenges

Alaranta notes that the most significant challenges he's faced while developing Banan OS have involved comprehending extensive technical specifications, something he hadn't previously experienced.

However, the project has also been punctuated by rewarding "it's alive" moments. Alaranta finds it especially gratifying to witness new features functioning flawlessly on real hardware, citing milestones such as:

• Achieving keyboard input
• Implementing USB mouse input
• Successfully running DOOM
• Reading data from disks
• Establishing network connectivity
• Getting a compiler to work

He considers the project to have become genuinely enjoyable after establishing the foundational components, which allowed him greater freedom to explore beyond conventional OS code and pursue features of personal interest. This stage, he estimates, was reached after approximately two months of development.

Oskari Alaranta: The Developer Behind Banan OS

As of writing this, Oskari Alaranta is a 22-year-old self-taught programmer and student based in Tampere, Finland. He is interested in low-level programming, especially operating system development.

Alaranta's passion for OS development led him to create Banan OS, a project that has spanned over two years. He has expressed an aspiration to pursue a career in the industry, potentially leveraging his experience with Banan OS as a portfolio piece.

Contributing to Banan OS

Banan OS is a very new project, and Oskari Alaranta welcomes contributions to help improve it.

As Banan OS is a learning project for Alaranta, he request that contributors contact him in advance (via email, Discord, or by raising an issue) before starting work on any new features. Bug fixes are always welcome.

Banan OS is primarily hosted on Alaranta's personal server. While contributing is not as straightforward as it would be on platforms like GitHub, you can submit pull requests via the GitHub mirror, and Alaranta will apply them manually.

If you'd like a direct account on Alaranta's server, you can contact him via email or Discord.

Conclusion

Banan OS is proof that with dedication, even a single student can create something remarkable. Oskari Alaranta has invested a significant time and effort in Banan OS development.

A notable aspect of Banan OS is that it's largely built from scratch, with Alaranta writing most of the code himself. This ambitious approach requires deep technical knowledge and a problem-solving mindset.

Alaranta's commitment to building from scratch extends to critical components like the AML interpreter, which he chose to develop himself rather than using existing solutions. This choice shows his dedication to understanding and controlling all aspects of the OS.

Banan OS is still under development. Check the project's GitHub repository for the latest updates and changes.

Resource:

• Banan OS GitHub Repository

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