GitOS

My personal graphical operating system project

Graphical shell

Links

You can access the documentation here.

There is a simple v86-based demo available here!

Note that the speed is not real-time.

Goals

Boot

• Custom bootloader - GitBoot
  • Loading kernel from ATA drive
  • BIOS memory mapping routine
  • Set VBE to 1024x768x32
  • Load kernel.elf from partition

• GRUB Multiboot support

Kernel

• Global Descriptor Table

• Interrupt Descriptor Table and handlers

Drivers

• Disk driver with streaming support

• Graphics driver with text mode and VBE support

• PIC handling routines

• PS2 keyboard support

• PS2 mouse support

• Serial port communication

Formats

• Support for the ELF executable format

Filesystem

• File operations and management routines

• FAT16 filesystem support (w/o writing)

• Memory-based filesystem

• Pipe-based filesystem support

• Path parsing functionality

Memory Management

• Heap management

• Paging support

• Dynamic memory allocation

Task Management

• Process management functionality

• Task switching mechanisms

• Recovering from task crashes

• Multitasking support
  • Round robin scheduler

• Process arguments and environment passing

Syscalls

• Syscall interface

• File operations support

• Dynamic memory allocation

• Executing processes

Userland

• Developed blank application

• Graphical shell functionality
  • Drawing background
  • Graphical cursor
  • Compositor

• C/C++ application support

• Basic printing to kernel stdio
• Debugging userland applications