DLH 40 arch/x86/boot/early_serial_console.c outb((divisor >> 8) & 0xff, port + DLH); DLH 110 arch/x86/boot/early_serial_console.c dlh = inb(port + DLH); DLH 145 arch/x86/kernel/early_printk.c serial_out(early_serial_base, DLH, (divisor >> 8) & 0xff);