message: install interrupt handlers after the frequency measurement
  because the frequency measurement could use the PIT and programs
  temporarily its own interrupt handler
diff: @@ -377,12 +377,12 @@ pub fn boot_processor_init() {
  idt::install();
  pic::init();
  - irq::install();
  processor::detect_frequency();
  processor::print_information();
  unsafe {
  trace!("Cr0: {:#x}, Cr4: {:#x}", cr0(), cr4());
  }
  + irq::install();
  systemtime::init();
  if environment::is_single_kernel() {
  