On Alpha and Integrity server systems, establishes a
    correspondence between pages in the virtual address space of
    the process and the pages occupied by a global disk file, page
    file, or demand-zero section and can map to a demand-zero section
    with shared page tables.

    This service accepts 64-bit addresses.

    Format

      SYS$MGBLSC_64  gs_name_64 ,ident_64 ,region_id_64

                     ,section_offset_64 ,length_64 ,acmode

                     ,flags ,return_va_64 ,return_length_64

                     [,start_va_64]

    C Prototype

      int sys$mgblsc_64  (void *gsdnam_64, struct _secid *ident_64,

                         struct _generic_64 *region_id_64, unsigned

                         __int64 section_offset_64, unsigned __int64

                         length_64, unsigned int acmode, unsigned int

                         flags, void *(*(return_va_64)), unsigned

                         __int64 *return_length_64,...);