GitOS

My personal graphical operating system project

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