HorizonOS

A toy kernel written in C targeting both x86 and x86_64

Currently Implemented Features

i386

• GDT
• Segmentation
• ISR/IQR support
• Paging
• Heap allocated memory
• APIC support
• ACPI configuration
• PS/2 keyboard driver
• Timer driver
• Makeshift shell
• Logging

x86_64

• Limine support
• Logging
• APIC support
• uACPI full mode
• PS/2 keyboard driver
• AC97 audio driver
• Pong

Custom libc implementation (bootstrapped)

• Standard Library - basic stdio, stdlib, string functions

Timeline

i386

• Graphics Driver - VESA VBE framebuffer, or proper support

x86_64

• Hush - Horizon Utility Shell (Basic shell)

Both

• File System - Basic filesystem implementation (FAT32 or custom)
• System Calls - User/kernel mode interface
• Text editor - vim worsened
• User Mode - Ring 3 execution environment
• Multiprocessing w/ ACPI infrastructure
• Process Management - Task switching and scheduling
• Scheduler
• VFS - Virtual File System abstraction
• IPC Mechanisms - pipes, shared memory, message queues
• Network stack - TCP/IP implementation
• Ethernet driver
• USB driver
• ELF execution
• GUI Framework - basic windowing system

Ubuntu/Debian

sudo apt install cmake nasm xorriso qemu-system-x86 grub-pc-bin grub-common binutils

# x86_64 cross-compiler
sudo apt install gcc-x86-64-linux-gnu binutils-x86-64-linux-gnu
# or build x86_64-elf-gcc from source: https://wiki.osdev.org/GCC_Cross-Compiler

# i386 cross-compiler
sudo apt install gcc-i686-linux-gnu binutils-i686-linux-gnu

# Limine (x86_64 only)
# See: https://github.com/limine-bootloader/limine/blob/v10.x/INSTALL.md

Arch Linux

sudo pacman -S cmake nasm libisoburn qemu-system-x86 grub gcc binutils

# Cross-compilers and Limine (AUR)
yay -S i686-elf-gcc x86_64-elf-gcc limine

macOS

brew install cmake nasm xorriso qemu

# Cross-compilers
brew install x86_64-elf-gcc x86_64-elf-binutils  # x86_64
brew install i686-elf-gcc i686-elf-binutils        # i386

# Limine (x86_64 only)
# See: https://github.com/limine-bootloader/limine/blob/v10.x/INSTALL.md

Windows (MSYS2)

Untested, YMMV

pacman -S cmake nasm mingw-w64-cross-gcc mingw-w64-cross-binutils xorriso

# Limine (x86_64 only)
# See: https://github.com/limine-bootloader/limine/blob/v10.x/INSTALL.md

Build & Run

# i386
cmake --preset i386
cmake --build --preset i386

# x86_64
cmake --preset x86_64
cmake --build --preset x86_64

# Run with qemu
./qemu.sh # will automatically detect architecture

See CMAKE_BUILD.md for more details.

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vibes