Zelda OS

Archeticture Features:

•  x86
•  interrupt management.

Memory Features:

•  physical memory management.
•  4K paging(No 3G barrier break) for both kernel and PL3 tasks.
•  Virtual Memory Area(VMA) management(per-task VMAs and kernel VMAs).
•  paging fault handling, including page non-presence and page permission fault.
•  kernel memory allocator.

Kernel Features:

•  multitasking (PL0 tasks and PL3 tasks).
•  task signal framework.
•  Elf32 executable loading.
•  task exception detection(e.g. illegal instruction, #GP, paging permission violation).
•  Wait queue.
•  Timer.
•  bottom half schedule.
•  kernel panic.

Filesystem Features:

•  Virtual File System (VFS).
•  zeldafs as initramfs in Linux.
•  memfs as tmpfs in Linux.
•  devfs to expose kernel runtime data to userland.

Network Features:

•  net packets management.
•  Ethernet device interface.

Device Features:

•  Legacy virtio-net ethernet device driver(with revisionid == 0).
•  PS/2 keyboard management.
•  Programmable Interval Timer(PIT) management.
•  serial port input/output management and serial console.
•  Lower level Text mode video buffer management.
•  pseudo terminal console management.