https://github.com/alexander-akhmetov/mos

small operating system
https://github.com/alexander-akhmetov/mos

kernel os osdev rust

Last synced: about 1 month ago
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small operating system

• Host: GitHub
• URL: https://github.com/alexander-akhmetov/mos
• Owner: alexander-akhmetov
• Created: 2019-01-27T13:48:22.000Z (almost 6 years ago)
• Default Branch: master
• Last Pushed: 2021-04-30T10:03:51.000Z (over 3 years ago)
• Last Synced: 2023-07-31T17:02:52.358Z (over 1 year ago)
• Topics: kernel, os, osdev, rust
• Language: Rust
• Homepage:
• Size: 1.93 MB
• Stars: 9
• Watchers: 4
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# mos

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

**mos**

![mos: msh](https://github.com/alexander-akhmetov/mos/blob/readme-pics/screenshots/msh.png?raw=true)

**mOS boot log**

![mos: start-up logs](https://github.com/alexander-akhmetov/mos/blob/readme-pics/screenshots/start.png?raw=true)

## Development

Start QEMU with mOS inside:

```shell

make run

```

Run tests:

```shell

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?

* [x] Load! :-)

* [x] Print to VGA buffer

* [x] Mount ramdisk

* [x] Built-in support for TarFS

* [x] Interrupts

* [x] System clock

* [x] Syscalls ABI

* [x] Processes support, context switching

* [x] Start init process

* [x] 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

...