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mos

My attempt to write a small operating system (and to try Rust :) ).

mos

mos: msh

mOS boot log

mos: start-up logs

Development

Start QEMU with mOS inside:

make run

Run tests:

make tests

Folders structure

  • ./initrd: all files in this directory will be placed into a single archive and mounted as a TarFS to /initrd
  • ./src: kernel source code
  • ./lib: Contains userspace programs and librust: Rust library to write programs for mOS.

OS Entrypoint: /src/lib.rs.

Requirements

  • Cross compiled binutils (actually only ld): docs/binutils.md
  • NASM
  • Rust nightly (I use nightly-2019-11-04)
  • Docker to build iso with GRUB bootloader
  • QEMU
  • gnu-tar on MacOS (brew install gnu-tar)

librust

You can build userspace programs for mOS. To communicate with OS from Rust code you need to use librust. It is a library which provides interface to use all implemented system calls.

What can it do?

  • Load! :-)
  • Print to VGA buffer
  • Mount ramdisk
  • Built-in support for TarFS
  • Interrupts
  • System clock
  • Syscalls ABI
  • Processes support, context switching
  • Start init process
  • Shell for user's commands: msh

ToDo

  • Fix paging. It does not work properly, and because of that it's not possible to start separate processes. Now programs are being running as threads inside the OS.
  • After paging mmap call in the librust must be completed, so it will be possible to request memory from userspace.
  • Higher Half Kernel
  • fork syscall ...