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PeachOS64 — Build a Modern 64-Bit Operating System From Scratch

PeachOS Part Two Kernel Dev Series Click To Obtain

This repository is the companion source code for Part 2 of the PeachOS series.
In Part 1, we built PeachOS, a fully functioning 32-bit multitasking operating system.

In Part 2, we take the project to the next level:
🚀 Building a 64-bit multi-threaded kernel that runs in long mode with a graphical user interface (GUI) capable of rendering interactive, clickable, draggable windows.

Get the Course Part 2 Module One

Get the Course Part 2 Module Two

CLICK FOR FULL PART 2 SERIES BUNDLE

What You’ll Learn in This Course

This isn’t just theory—you’ll build a complete, modern OS step by step, starting from the bootloader all the way to a graphical desktop environment.

🔹 Module 1 Overview

  • Graphics & Display

    • Capture and control the UEFI framebuffer (draw pixels directly to screen).
    • Load images & fonts.
    • Build a terminal that renders text using pixel-based fonts.
    • Create the graphical subsystem beneath the terminal:
      • Relative drawing anywhere on screen.
      • Hierarchical graphics (parent/child offsets).
      • Composable UI elements.

  • Memory Management

    • Rebuild the heap allocator using the UEFI/BIOS E820 memory map.
    • Multi-heap system with intelligent allocation.
    • Paging-based memory defragmenter to solve fragmentation.

  • Disk & Partitions

    • Extend FAT16 filesystem to support multiple GPT partitions.
    • Mount each partition as a virtual drive.
    • Abstract the disk system for modern SSD/PCIe storage support.

✅ By the end of Module 1, you’ll have:

  • A 64-bit kernel bootable on modern UEFI hardware.
  • A pixel-based terminal with a full graphical foundation.
  • Advanced heap allocator + defragmentation support.
  • A multi-partition disk subsystem ready for GPT/SSD storage.

🔮 Module 2 Now Released

  • Standard C library in userspace (fopen, fread, etc.) via isr80h.
  • Full windowing system with interactive GUI elements.
  • NVMe SSD driver (high-speed storage).
  • PCI/PCIe enumeration & bridge support.
  • Faster program loading due to disk streamer cacheing
  • Run real user programs on your OS — contribute to the shared GitHub repo of student applications!

By the end of Part 2, you’ll have built a multi-threaded, 64-bit, GUI operating system from scratch—bootable on real hardware and extensible enough to run user applications.

📚 Take the Course

This repo contains the source code, but the course walks you through every line of it step by step.
👉 Enroll Here Module 1 and start building your own OS today. 👉 Enroll Here Module 2 and start building your own OS today.

License

This code is provided for educational purposes as part of the PeachOS course under GPL license See the license file.