text: #define VIDEO_ADDRESS 0xB8000
  #define MAX_ROWS 25
  #define MAX_COLS 80
  #define WHITE_ON_BLACK 0x0F
  #define RED_ON_WHITE 0xF4
  
  #define REG_SCREEN_CTRL 0x3D4
  #define REG_SCREEN_DATA 0x3D5
  
  void clear_screen();
  void kprint_offset(char* msg, int row, int col);
  void kprint(char* msg);
  