This is a mere hobby kernel for 32-bit x86, to learn about OS/Kernel development.

I'm adding features in no particular order, just implementing stuff I want to learn more about and what seems more fun at the moment.

• Make
• mtools (to generate an iso file)
• QEMU

If you're using a the Nix package manager, a development environment is ready for you to use inside the flake.

$ nix develop .#kernel

$ # Use our custom toolchain for building
$ export CROSS_COMPILE=toolchain/opt/i686-dailyrun/bin/i686-dailyrun-
$ export ARCH=i686               # The architecture's name
$ make iso      # builds the kernel.iso file
$ make qemu     # boots up qemu using the iso file

If you do not already have an available i686-elf toolchain, a custom GCC target for this kernel (i686-dailyrun) is available for you to build inside the toolchain directory. Note that using this toolchain is required when building userland executables destined to be used with this kernel.

$ make gcc TARGET=i686-dailyrun ARCH= CROSS_COMPILE= GCC_CONFIGURE_FLAGS='--with-newlib'
$ make libc ARCH=i686 CROSS_COMPILE=

I don't know how I can test kernel code, so all tests are performed manually for the time being ...

$ make qemu-server    # boots up a qemu server open for GDB connections
$ gdb -x .gdbinit build/kernel/kernel.sym

You can also run unit-tests on our libraries:

$ make tests

I try to keep the codebase well-documented. You can generate the full doc using doxygen:

$ make docs # Requires you to also pull the git submodules

• Memory management
  • Paging
  • Copy-on-Write
  • Guard pages
  • Shared pages
  • Page cache
• Drivers
  • Timer
  • Mouse
  • Loadable kernel modules
• Scheduling
  • Multitasking
  • Semaphores
  • Priority
  • Multiprocessor
• Networking
  • Ethernet
  • IP
    • ARP
    • IP segmentation
  • Berkley sockets
  • TCP
  • UDP
  • NTP
  • NAT
• Filesystems
  • VFS
  • ext2
  • NFS
• Porting
  • Load/Execute ELF programs
  • Porting an already existing program (Can it run DOOM?)
  • Dynamic ELF relocation
• Misc
  • IPC
  • SMP
  • POSIX syscalls compatibility