ArtOS

ArtOS is a very basic operating system which started from osdev tutorials but which quickly outgrew them.

The aim of this project is simply to learn. If it becomes something I want others to be able to use I will add the typical sections to this README.

Progress markers

Running DOOM (1993):

DOOM.mp4

p.s. it runs smoothly (easily achiving the hardcoded 35 fps) but the video recording and compression makes it look clunky

Loading Screen and Keyboard:

Splash Screen:

Pixel Mode:

Colours:

Hello World:

My Goals

• Basics
• • Boot into hello world
• • Text mode terminal newline Character
• • Text mode terminal Scrolling
• • Colour Art
• • Serial PORT1 output from kernel
• • Pixel mode text support
• • Draw "art" in pixel mode
• • Replace grub and multiboot with grub2 and multiboot2
• Interrupts and time
• • Interrupt Service Routines (ISR) are targeted on interrupt using a partially filled Interrupt Descriptor Table
• • Interrupt Requests (IRQ) can be handled
• • IRQ0 targets a timer decrementor to allow for scheduling and waiting.
• • Kernel sleep (block until n ticks occur)
• • Replace PIC with APIC
• • Real time clock implemented
• • Replace PIT with HPET
• User IO
• • Keyboard
• • Mouse
• • Shell environment
• Hardware detection and support
• • SMBIOS detection
• • PCI device detection
• • IDE detection
• • IDE initialisation (currently supports CD ROM only, see storage)
• • Initialise frame buffer etc using the multiboot2 data instead of hard coded
• • Detection and selection of video modes i.e. reconfiguring the VGA hardware
• Storage
• • Attach a RW storage device in Qemu
• • Read data from CD ROM using PCI IDE DMA BusMastering
• • Use data from CD ROM i.e. parse .iso file system
• • Support virtual attached RW storage
• • Support path strings or similar filename access
• • Detect and mount/unmount storage devices on real hardware
• • USB storage support
• Filesystem
• • Create a directory tree from iso fs data
• • Implement a rudimentary filesystem
• • implement proper pdclib compliant filehandling
• PDCLIB
• • Implement C standard library for kernel space
• • Load a file using pdclib
• • User space functionality (e.g. exit, raise, signal)
• DOOM
• • Play DOOM for ArtOS!
• • Play DOOM for ArtOS on real hardware
• • Loading from CD ROM instead of baked into the binary
• • Loading from boot USB
• • Run in user space
• • Add sound
• • Add save game support
• Optimisations
• • Basic SIMD for memcpy, memmove and memset
• • Advanced SIMD usage (string operations and vector maths)
• • Ther are many other optimisations to consider
• Path to User Space
• • Use Paging/virtual memory
• • Proper handling of a scheduler to allow for sleeping of a task
• • Implement a standard library for user space
• • Run an executable
• • Self hosting compiler
• Misc
• • Remove resolution specific baked in splash screen with centered graphic (can be scaled) and programatically drawn borders. Bring back the loading bar?
• Stretch goals
• • higher half and 64-bit support
• • ARM support (raspberry pi zero?)
• • Multithreading
• • Networking
• • USB support
• • Window manager and windows
• • Graphics driver(s)

Tools

• i686-elf gcc cross-compiler
• QEMU
• GRUB2
• Multiboot2
• CMake
• Jetbrains CLion
• xorriso
• ventoy
• Public Domain C Library
• DOOM Generic