mOS

Hobby operating system written in C that targets early x86_64 computers and low RAM requirements

Features

- Monolithic kernel design
- 32 bpp linear frame buffer support
- Custom initrd support
- Serial console support
- Static ELF loading support
- Basic VFS
- PCI enumeration
- Very basic ACPI support
- Block allocator
- Page allocator
- Preemptive round-robin scheduler
- Socket IPC
- Unlimited virtual terminals
- 15+ system calls accessible in userspace
- Driver infrastructure
- Symmetric multiprocessing support
- FAT32 support
- AHCI support
- ATA/IDE support
- PS/2 keyboard and mouse support
- Primitive window management
- CLI applications
- VMware SVGA II support
- Bochs/QEmu video support
- Serial debug console
- Userspace libraries

Hardware support

CPU: x86 CPU (minimum required with 64-bit Long Mode, SSE3 and FXSR)
Storage: AHCI/ATA Hard Disks or SSDs
Graphics: VBE, UEFI GOP, BGA, VMware SVGA (at least one of them required)
Input: PS/2 keyboard and mouse
Networking: none
Others: HPET (required), ACPI (required 1.0), PCIe, Serial

Goals

mOS is designed to be an useful and lightweight OS that doesn't comply with any already written specification while supporting older and newer hardware.

Lines of code

mOS (kernel+userspace+libraries) consist of 10825 lines of code (as of 20 Aug. 2023).

Building and running

See BUILDING.md

Screenshots

See screenshots folder here

Issues

mOS is in a very pre-alpha stage of development and it is not guranteed to be bug-free. We track them here. If you encounter a never to be seen bug, feel free to open a new issue. We're happy to see people try to help!