Sine OS

Sine OS is a lightweight hobby operating system built to explore operating system development, system architecture, and low-level programming. Designed to run smoothly on both modern and legacy hardware.

The project is currently being developed as a 32-bit x86 system to establish a solid foundation, with an active roadmap to upgrade to a 64-bit (Long Mode) architecture.

Current Features

• Bootloader Entry: Multiboot-compliant entry point (boot.asm)
• Memory Management: Global Descriptor Table (GDT) and Physical Memory Manager (PMM) via Bitmap Allocation
• Interrupts: Interrupt Descriptor Table (IDT) with PIC remapping
• Graphics Engine: VESA Framebuffer (800x600, 32-bit True Color) with gradient desktop, taskbar, and window rendering
• Bitmap Font Renderer: 8x8 pixel font engine for drawing text in graphical mode
• Graphical Terminal: Interactive command shell rendered inside a GUI window with scrolling
• Keyboard Input: PS/2 Scancode translation to US-QWERTY
• Mouse Input: PS/2 Mouse Driver with graphical cursor and background pixel caching
• Standard Library: Basic libc functions (strlen, strcmp, memset, itoa)
• Bootable ISO: GRUB-based ISO image for emulators and real hardware

Roadmap

• Transition to 64-bit Long Mode:
  • Implement Paging (PAE)
  • Update GDT for 64-bit descriptors
  • Recompile kernel for x86_64

Architecture & Build

• Core Kernel: C (kernel.c)
• Graphics Engine: C (graphics.c, graphics.h)
• Memory Manager: C (pmm.c, pmm.h)
• Standard Library: C (string.c, string.h)
• Hardware Initialization: NASM Assembly (boot.asm, gdt.asm, idt.asm)

Getting Started

# Compile
nasm -f elf32 boot.asm -o boot.o
gcc -m32 -c kernel.c -o kernel.o -std=gnu99 -ffreestanding -O2
gcc -m32 -c graphics.c -o graphics.o -std=gnu99 -ffreestanding -O2
gcc -m32 -c pmm.c -o pmm.o -std=gnu99 -ffreestanding -O2
gcc -m32 -c string.c -o string.o -std=gnu99 -ffreestanding -O2
ld -m elf_i386 -T linker.ld -o myos.bin boot.o gdt.o idt.o string.o pmm.o graphics.o kernel.o

# Create bootable ISO
mkdir -p isodir/boot/grub
cp myos.bin isodir/boot/myos.bin
grub-mkrescue -o sineos.iso isodir

# Run in QEMU
qemu-system-i386 -cdrom sineos.iso -m 32