On Alpha and Integrity server systems, allows a process to create
    a permanent global page frame section and to map a section of its
    address space to the global page frame section.

    This service accepts 64-bit addresses.

    Format

      SYS$CRMPSC_GPFN_64  gs_name_64 ,ident_64 ,prot ,start_pfn

                          ,page_count ,region_id_64 ,relative_page

                          ,acmode ,flags ,return_va_64

                          ,return_length_64 [,start_va_64

                          [,map_page_count]]

    C Prototype

      int sys$crmpsc_gpfn_64  (void *gs_nam_64, struct _secid

                              *ident_64, unsigned int prot, unsigned

                              int start_pfn, unsigned int page_count,

                              struct _generic_64 *region_id_64,

                              unsigned int relative_page, unsigned

                              int acmode, unsigned int flags, void

                              *(*(return_va_64)), unsigned __int64

                              *return_length_64,...);