OpenHobbyOS is a 32-bit x86 hobby operating system with a POSIX-like environment, preemptive multitasking, Linux ABI syscall compatibility, and support for running Doom, Qt6, and other ported software.
- Kernel: Monolithic, preemptive multitasking, round-robin scheduler.
- Memory: Paging with per-process page directories, copy-on-write fork.
- Syscall ABI: Linux ABI via int 0x80 (80+ syscalls).
- VFS: initrd, devfs, read/write ext2.
- Disk Encryption: AES-256-XTS at boot via mbedTLS. Passphrase prompt before root mount, PBKDF2-HMAC-SHA256 key derivation, per-sector encrypt/decrypt.
- Graphics: XNX compositor (windowing, z-ordering) backed by pixman. libtsm VT100 terminal emulator.
- Networking: TCP/IP via lwIP, RTL8139 PCI NIC driver.
- Power: Shutdown, reboot, suspend via uACPI.
Ports available via the i686-openhobbyos-elf toolchain:
- Multimedia: FFmpeg, ohplay (audio player)
- Gaming: Doom, TinyGL
- Tools: Fastfetch, zlib, Qt6 (custom QPA plugin)
Requires an x86 system or VM.
- Architecture: IA-32 / i386 (or x86-64 in 32-bit mode)
- Memory: 200-500 MB
- Build: gcc-multilib (or i686-elf-gcc), nasm 2.15+, make, python3, xorriso, grub-mkrescue
# Build the kernel, ports, and generate a bootable ISO
make all
# Launch the OS in QEMU
make run
# Run with serial output if you're debugging
make run-debug
You can find the final bootable ISO at build/ohos.iso.
Originally the ElexerKernel project (2013). First public repository published 2025.
uACPI, lwIP, libtsm, pixman, Qt6, FFmpeg, TinyGL, mbedTLS.
Artwork by Mark Sordestom.
OHOS is open-source under the BSD 3-Clause License. See the LICENSE file for more details.