Cosmos is my world in bare bone - a kernel running as you like. This is my own attempt to gain back my interest in system programming.

• set up development environment powered by QEMU, CMake, CLion, GCC cross compiling toolchain and NASM
• minimal C standard library (libc) for kernel development
• handover the boot from multiboot and enable x86 protect mode
• setup GDT and segments for flat memory model
• setup page directory, page table and enable paging
• relocate the kernel to higher half virtual address space (start from 3G)
• setup IDT and remap PIC IRQs to interrupts 32 ~ 47
• VGA frame buffer driver
• PS/2 keyboard driver
• physical memory manager and page frame allocator
• virtual memory manager and separate virtual memory space per process
• user land
• system calls
• file system
• consistent device driver interface and device manager

# Install cmake, qemu
brew install qemu cmake cdrtools

# install cross build toolchain
brew tap nativeos/i386-elf-toolchain
brew install nasm i386-elf-binutils i386-elf-gcc i386-elf-gdb i386-elf-grub

./build.sh

Once the kernel is running, you can use GDB to remote debug in port 1234. CLion has a good support of visual debugging. Create a Remote Debug config, and set break points in code. It rolls!

• Libc: derived from oskit
• ASCII art: http://patorjk.com/software/taag/#p=display&f=Double&t=COSMOS