Fusion is a hobby operating system for x86-64 implemented in Nim. I'm documenting the process of building it at: https://0xc0ffee.netlify.app.

UEFI Bootloader

GUI (Note: This screenshot is from the graphics branch, which is still a work-in-progress.)

Booting and Running the Kernel

The following features are currently implemented:

• UEFI Bootloader
• Memory Management
  • Single Address Space (Higher Half Kernel)
  • Physical Memory Manager
  • Virtual Memory Manager
  • Demand Paging
• Task Management
  • Kernel Tasks
  • User Mode Tasks
  • Preemptive Multitasking
  • Priority-based Scheduling
  • ELF Loader (Demand Paged, Relocation)
• System Calls
  • System Call Interface
  • User Mode Library
• IPC
  • Channel-based IPC
  • Message Passing
• Hardware
  • PCI Device Enumeration
  • ACPI Configuration
  • Local APIC Timer
  • I/O APIC Interrupts
  • PS/2 Keyboard Driver
  • Bochs Graphics Adapter Driver

• Capability-based Security
• Event-based Task State Machines
• Disk I/O
• File System
• Shell
• GUI
• Networking

To build Fusion, you need to have the following dependencies installed:

• Nim
• LLVM (clang and lld)
• Just

The clang and lld binaries should be in your PATH. You can edit the .env file to specify the path to the clang and lld binaries if they are not in your PATH.

Build Fusion with the following command:

just build

Fusion currently runs on QEMU, so you'll need to install it first. Launch Fusion with the following command:

just run

MIT