Zephyrus OS

Zephyrus OS is a hobby x86 operating system kernel I started developing on August 9, 2025.
This project is ongoing.

NOTE:

• The OS is being transitioned from x86 to x86_64 architecture. As a result, updates and releases may be delayed.

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Current Features

• Core Kernel

  • Text output: print strings, characters, hex values, newline, carriage return, scrolling
  • Global Descriptor Table (GDT) implementation
  • Interrupt Descriptor Table (IDT) with basic exception handling
  • Kernel panic handling with global panic codes
  • Kernel logging system for debugging and runtime information (via COM1)
  • Improved kernel heap allocator with detailed heap tests
  • Exposed Multiboot2 info pointer

• Drivers

  • PIT Timer for system ticks and timekeeping
  • PS/2 Keyboard driver with shift key support and input buffering
  • CMOS Real-Time Clock (RTC) driver
  • PC Speaker driver
  • COM1 serial driver with boot and runtime logging
  • ATA Driver (Read only)

• Filesystem

  • RAMFS support via GRUB
  • Support for the FAT16 filesystem

• Kernel shell (CLI)

  • Command parsing with argument support
  • Built-in commands (e.g. echo, help, time, etc.)
  • meminfo command (prints available system RAM) NOTE: CURRENTLY DOES NOT WORK
  • rd command (prints the contents of a file)
  • Additional internal commands and fallback CLI

• Bootloader

  • GRUB multiboot2-compliant header in boot.s
  • Bootsplash support

• Graphics

  • Framebuffer graphics (GRUB gfx payload)
  • Image rendering (currently custom SRI format; BMP support planned)
  • Line drawing using Bresenham’s algorithm
  • Triangle, rectangle, and square drawing
  • Consolidated graphics APIs in gfx.h for easy inclusion
  • Organized drawing code and framebuffer initialization (init.c/init.h)

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Screenshots

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Planned Features (TODO)

• Reading/writing beyond the root directory
• Write support
• Paging
• Additional device drivers (PS/2 Mouse, more COM ports)
• Expand font rendering (Currently limited to only an 8x8 font)
• Support for more image formats (BMP, etc.)

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Contributing

This is a personal project, but contributions and suggestions are welcome!

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Contact

For questions or feedback, feel free to reach me at: vukmitic81@gmail.com