KIRQL
KeAcquireInterruptSpinLock(
  IN  PKINTERRUPT Interrupt
  );

Routine Description:

    This function raises the IRQL to the interrupt synchronization level
    and acquires the actual spin lock associated with an interrupt object.

Arguments:

    Interrupt - Supplies a pointer to a control object of type interrupt.

Return Value:

    The previous IRQL is returned as the function value.