VMS Help System Services, $CMKRNL 64 (Alpha Only)  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    On Alpha 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);

1 - Arguments

 routin_64

    OpenVMS usage:procedure
    type:         procedure value
    access:       call without stack unwinding
    mechanism:    by 32- or 64-bit reference
    Routine to be executed while the process is in kernel mode. The
    routin_64 argument is the 32- or 64-bit address of this routine.

 arglst_64

    OpenVMS usage:arg_list
    type:         quadword (unsigned)
    access:       read only
    mechanism:    by 32- or 64-bit reference
    Quadword argument list to be passed to the routine specified
    by the routin_64 argument. The routin_64 argument is the 32- or
    64-bit address of this routine.

    If the arglst value is nonzero and is not accessible as an
    address or if the routine is inaccessible, the service returns
    SS$_ACCVIO.

    Alpha systems require a pointer to a valid argument list or a
    value of 0 in the arglst_64 argument. This means that the arglst_
    64 argument, if nonzero, must contain an accessible virtual
    address for an argument list, the first quadword of which must
    be a number between 0 and 255 specifying the number of quadwords
    that follow it on the list.