On Alpha and Integrity server systems, changes the access mode of
    the calling process to kernel mode. This service allows a process
    to change its access mode to kernel, execute a specified routine,
    and then return to the access mode in effect before the call was
    issued.

    This service accepts 64-bit addresses.

    Format

      SYS$CMKRNL_64  routin_64 ,arglst_64

    C Prototype

      int sys$cmkrnl_64  (int (*routin_64)(__unknown_params),

                         unsigned __int64 *arglst_64);