Roadmap:
    ✔ Higher half booting in long mode
    ✔ Virtual memory management
    ☐ Physical memory manager
        ✔ Single page
        ☐ Multiple page blocks
    ☐ Multithreading
        ✔ Task switching
        ✔ Separate address spaces
        ☐ Forking?
    ☐ SSE
        ✔ Enable SSE instructions
        ✔ Save SSE registers on task switch
    ☐ Symmetric multiprocessing
    ☐ User mode code execution
        ☐ Syscall interface
    ☐ Decide kernel architecture
        - Monolitic kernel?
        - Microkernel?

Documentation:
    ✔ Toolchain
    ✔ Booting
    ✔ Memory management
    ✔ Libc in kernel space
    ✔ ACPI tables
    ✔ APIC, IOAPIC, APIC timer
    ☐ SSE
    ☐ Framebuffer
    

https://pubs.opengroup.org/onlinepubs/9699919799/