The meaning of the name is the recursive accronym "Doors of Open Run-time Systems".
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)
- 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)
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+ and xorriso 1.3.8+.