kmOS

kmOS is a general-purpose UNIX-like monolithic operating system written from scratch. Its primary aim is to have interoperability with existing software and architectures; be maintainable, modular and quick.

On the backend, since kmOS is monolithic, it contains a very quick driver model between device drivers and the kernel. This enables the drivers to be written in a forward compatible manner so that the kernel level components can be upgraded without necessarily requiring a recompilation of all device drivers.

kmOS is event-driven, preemptible, SMP-ready, and network ready.

Specifications

• C/C++
• x86-32- and x86-64-bit architecture
• GRUB bootloader
• UNIX-like
• Event-driven
• Preemptible
• SMP-ready
• Network ready
• ELF executable in userland
• Modules accessible in userland
  • IDE disks
  • DOS partitions
  • Clock
  • EXT2 (read only)
  • Boch VBE
• Userland
  • POSIX / ANSI (hopefully)
  • LibC
  • Can run Shell and Lua

Detailed Specifications

• Kernel
  • Filesystems
    • EXT3, EXT4, XFS
    • VFS
    • FAT32 and NTFS
  • Memory management
    • Demand paging
    • Shared memory support using POSIX API shm or System V IPC
    • Non-contiguous memory support using buddy or slab allocator
  • Process and thread management
    • Multithreading in userland (POSIX threads)
    • Locking primitives (mutex, semaphore, condition variable)
    • Lock-free algorithms for SMP scalability (atomic operations)
    • Kernel preemption (SMP)
  • Security
    • User priviledge model
    • SELinux-like MAC
    • Kernel-level ASLR
  • Networking
    • TCP/IP stack
    • IPv4 and IPv6
    • UDP, TCP, ICMP
    • ARP, DHCP, DNS
    • Socket API
• Device/hardware features
  • Device drivers
    • USB support (HID, mass storage)
    • GPU hardware acceleration or a basic framebuffer console
    • Sound card support (ALSA-like API)
  • Power management
    • ACPI
    • APM
    • CPU frequency scaling
  • Virtualization
    • KVM or QEMU paravirtualization
    • Virtual device drivers
• Userland
  • Shell
    • Supports scripting - Lua, maybe Python or Perl later on
    • Basic UNIX utilities (ls, cat, grep, etc.)
  • Libraries
    • Dynamic linking (ELF)
    • Common binary format compatibility (Wine-like layer for Windows binaries)
  • GUI
    • Basic windowing system (OpenGL or framebuffer-based)
    • GUI toolkit (idk, maybe Qt or GTK)
  • Package management
    • Package manager (like pacman)
    • Package format (like .rpm)
• Developer tools
  • Build tools
    • GCC, Clang
    • GDB server
  • Dev libraries
    • System APIs (POSIX)
    • Interface for kernel modules (like DKMS, module_init and module_exit)
    • Kernel log viewer (like dmesg)
    • Maybe system monitoring (like top, iotop, htop)
    • Kernel tracing (like strace, ltrace)