https://github.com/netromdk/doors

Doors of Open Run-time Systems (OS)
https://github.com/netromdk/doors

32-bit cpp cpp11 grub2 iso kernel os-dev qemu

Last synced: about 1 month ago
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Doors of Open Run-time Systems (OS)

• Host: GitHub
• URL: https://github.com/netromdk/doors
• Owner: netromdk
• License: gpl-3.0
• Created: 2015-03-23T10:05:03.000Z (over 9 years ago)
• Default Branch: master
• Last Pushed: 2015-04-19T19:12:04.000Z (over 9 years ago)
• Last Synced: 2024-10-03T17:53:17.001Z (about 2 months ago)
• Topics: 32-bit, cpp, cpp11, grub2, iso, kernel, os-dev, qemu
• Language: C++
• Homepage:
• Size: 1.62 MB
• Stars: 2
• Watchers: 4
• Forks: 0
• Open Issues: 4
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Doors

The meaning of the name is the recursive accronym "Doors of Open Run-time Systems".

# Concept

The challenge was to write a 32-bit OS using C++11 aiming for paged memory, exceptions/interrupts support, and a keyboard driver. Then dropping into a simple shell for processing simple commands like querying CPU information, uptime, memory available/used, start/stop/monitor timers etc. Maybe being able to play a simple "Snake" game or similar.

Things to look into later:

* Floating-point number support ([IEEE-754](https://en.wikipedia.org/wiki/IEEE_754-1985))

* Multi task scheduling

* Real-Time Clock/CMOS support

* Harddisk driver (supporting FAT32 or EXT2 to make it possible to install to disk and boot from it)

* Mouse driver

* USB drivers (general concept)

# Usage

The buid system uses Makefiles with the following usage (`make help`):

```

=== Doors Makefile ===

Development: build, test, tags, clean-tests, clean-tags, clean, clean-all

Emulation: run, run-iso

Distribution: iso, zip, tgz, bz2, xz

```

Before you `build` take a look at "config.sh". It will use the `ARCH-ABI-*` GNU programs, e.g. i386-elf-g++, i386-elf-as, i386-elf-ar etc. Right nown there is only support for i386.

`run` will build and use QEmu to run the kernel directly.

`run-iso` will build, create ISO and use QEmu to load the ISO as a CD-ROM. Note that to create the ISO it uses `grub-mkrescue` which requires [GRUB 2+](https://www.gnu.org/software/grub/) and [xorriso 1.3.8+](https://www.gnu.org/software/xorriso/). 

# References

* [Intel i386 manuals](http://www.intel.com/content/www/us/en/processors/architectures-software-developer-manuals.html) ([PDF](http://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-software-developer-manual-325462.pdf))

* [Logix's i386 reference](http://www.logix.cz/michal/doc/i386/)

* [Modern Operating Systems](http://www.amazon.com/Modern-Operating-Systems-Andrew-Tanenbaum/dp/013359162X/ref=sr_1_1?ie=UTF8&qid=1428699443&sr=8-1&keywords=Modern+Operating+Systems) (book)

* [Operating Systems Principles](http://www.amazon.com/Operating-Systems-Principles-Lubomir-Bic/dp/0130266116) (book)

* [osdev.org](http://wiki.osdev.org/Main_Page)