NanoOS

A 64-bit UEFI-only operating system written in Zig.

Requirements

• Zig: Version 0.15.x or later (Master branch recommended).
• QEMU: For emulation and testing.
• Docker: For containerized building and running (optional but recommended).

Building & Running

Using Docker (Recommended)

1. Build the Docker Image:

   docker build -t nanoos .

2. Run with QEMU:

   • Linux:

     docker run -it --rm -v $(pwd):/app -e DISPLAY=$DISPLAY -v /tmp/.X11-unix:/tmp/.X11-unix nanoos

   • Windows (PowerShell):
     • Requires an X Server (like VcXsrv) running on Windows.
     • Set Display number to 0.

     docker run -it --rm -v ${PWD}:/app -e DISPLAY=host.docker.internal:0.0 nanoos

Running Locally on Windows

1. Prerequisites:

   • Zig: Installed and in PATH.
   • QEMU: Installed and in PATH (or C:\Program Files\qemu).
   • OVMF: OVMF.fd file placed in the project directory.

2. Run:

   • PowerShell: .\scripts\run_local.ps1
   • CMD: .\scripts\run.bat
   • Linux: ./scripts/run.sh

Manual Build

1. Build:

   zig build

2. Run in QEMU:
   Ensure qemu-system-x86_64 and OVMF.fd are in your PATH or current directory.

   qemu-system-x86_64 -bios OVMF.fd -drive format=raw,file=fat:rw:zig-out -net none -serial stdio

Architecture

NanoOS uses a layered architecture:

1. UEFI Layer: The OS boots as a UEFI application. It uses UEFI Boot Services to locate hardware (Graphics, Input).
2. HAL (Hardware Abstraction Layer): Wraps raw UEFI protocols into easy-to-use Zig structs (e.g., FrameBuffer).
3. GUI Engine: Provides high-level drawing capabilities on top of the HAL.
4. Kernel/Desktop: The main loop that manages the UI and handles user input.

Features

• UEFI Boot: Boots directly from firmware.
• Graphics: High-resolution framebuffer with 32-bit color.
• Desktop: Simple window manager with a Taskbar, Icons, and Windows.
• Apps: Terminal, File Manager, Calculator, Editor, Sound Recorder.
• Input: Mouse and Keyboard support.