swift_os

An operating system written in Swift.

Prerequisites

• QEMU 9.0 or later
  • Arch Linux: sudo pacman -S qemu-system-aarch64
  • Fedora 41 or later: sudo dnf install qemu-system-aarch64-core
  • Fedora 40: Build from source
  • Ubuntu 24.04/22.04: Build from source
  • Debian 12: sudo apt install -t bookwarm-backports qemu-system-arm (you need to add backports to sources.list)
  • macOS 14 or later: brew install qemu
• Swiftly
• Swift toolchain: Just run swiftly install after installing Swiftly

Building for emulators

swift build -c release --triple aarch64-none-none-elf --toolset toolset.json

Tip

If you want to reduce the binary size significantly, you can use a -experimental-hermetic-seal-at-link flag. However, when using it, swift_os may not work as expected.

swift build -c release --triple aarch64-none-none-elf --toolset toolset.json --experimental-lto-mode=full -Xswiftc -experimental-hermetic-seal-at-link

Running on QEMU

swift run -c release --triple aarch64-none-none-elf --toolset toolset.json

Tip

If you want to reduce the binary size significantly, you can use a -experimental-hermetic-seal-at-link flag. However, when using it, swift_os may not work as expected.

swift run -c release --triple aarch64-none-none-elf --toolset toolset.json --experimental-lto-mode=full -Xswiftc -experimental-hermetic-seal-at-link

Building for real hardwares

swift build -c release --triple aarch64-none-none-elf --toolset toolset.json
llvm-objcopy .build/release/Kernel -O binary .build/kernel8.img

Tip

If you want to reduce the binary size significantly, you can use a -experimental-hermetic-seal-at-link flag. However, when using it, swift_os may not work as expected.

swift build -c release --triple aarch64-none-none-elf --toolset toolset.json --experimental-lto-mode=full -Xswiftc -experimental-hermetic-seal-at-link
llvm-objcopy .build/release/Kernel -O binary .build/kernel8.img

Cleaning build outputs

swift package clean

swift-format

This project is using swift-format for formatting and linting.

Format:

swift format format -rip .

Lint:

swift format lint -rsp .