On Alpha and Integrity server systems, allows modification of the
    user capability set for a specified CPU, or for the global user
    capability CPU default.

    This service accepts 64-bit addresses.

    Format

      SYS$CPU_CAPABILITIES  cpu_id [,select_mask] [,modify_mask]

                            [,prev_mask] [,flags]

    C Prototype

      int sys$cpu_capabilities  (int cpu_id, struct _generic_64

                                *select_mask, struct _generic_64

                                *modify_mask, struct _generic_64

                                *prev_mask, struct _generic_64

                                *flags);