GitFOSS

lib LibBootstrap
  @[Packed]
  struct StartInfo
    multiboot_ptr : UInt32
    end_of_kernel : UInt32
  end
end

fun kearly(info_ptr: LibBootstrap::StartInfo*)

  # Get the startup info
  info = info_ptr.value

  # Initialize stuff
  # GDT.init
  # Heap.init info.end_of_kernel
  # PIC.remap
  # PIC.enable
  # IDT.init
end

def clear_screen
  video_memory = Pointer(UInt8).new(0xB8000_u64)
  screen_size = 80 * 25
  i = 0
  while i < screen_size
    (video_memory + (i * 2)).value = " ".to_unsafe.value
    (video_memory + (i * 2) + 1).value = 0x07_u8
    i += 1
  end
end

fun kmain
  # IDT.enable_interrupts
  # kprint "Hello from Fluorite."

  asm("cli")
  clear_screen

  message = "[CrystalOS Kernel] Hello from Crystal\n"
  puts message

  while true
  end
end