This special parameter is use by VSI and is subject to change. Do
    not change this parameter unless VSI recommends that you do so.

    TIME_CONTROL is an SMP bit mask parameter that controls debugging
    functions. The following bits are defined:

    Bit                    Description

    0                      Obsolete.

    1 (EXE$V_SANITY)       Disables the SMP sanity timer support.

    2 (EXE$V_NOSPINWAIT)   Disables the functional behavior of the
                           SMP spinwait support.

    TIME_CONTROL is a DYNAMIC parameter.