Arguments

 

region_id_64

   OpenVMS usage:region identifier
   type:         quadword (unsigned)
   access:       read only
   mechanism:    by 32- or 64-bit reference
   The region ID associated with the virtual address range to be
   expanded. The file VADEF.H in SYS$STARLET_C.TLB and the $VADEF
   macro in STARLET.MLB define a symbolic name for each of the three
   default regions in P0, P1, and P2 space.

   The following region IDs are defined:

   Symbol     Region

   VA$C_P0    Program region
   VA$C_P1    Control region
   VA$C_P2    64-bit program region

   Other region IDs, as returned by the $CREATE_REGION_64 service,
   can be specified.
 

length_64

   OpenVMS usage:byte count
   type:         quadword (unsigned)
   access:       read only
   mechanism:    by value
   Length of the virtual address space to be created. The length
   specified must be a multiple of CPU-specific pages.
 

acmode

   OpenVMS usage:access_mode
   type:         longword (unsigned)
   access:       read only
   mechanism:    by value
   Access mode associated with the call to $EXPREG_64. The access
   mode determines the owner mode of the pages as well as the read
   and write protection on the pages. The acmode argument is a
   longword containing the access mode. The $PSLDEF macro defines
   symbols for the four access modes.

   The $EXPREG_64 service uses whichever of the following two access
   modes is least privileged:

   o  The access mode specified by the acmode argument.

   o  The access mode of the caller. The protection of the pages
      is read/write for the resultant access mode and those more
      privileged.

   Address space cannot be created within a region that has a create
   mode associated with it that is more privileged than the caller's
   mode. The condition value SS$_IVACMODE is returned if the caller
   is less privileged than the create mode for the region.
 

flags

   OpenVMS usage:mask_longword
   type:         longword (unsigned)
   access:       read only
   mechanism:    by value
   Flag mask controlling the characteristics of the demand-zero
   pages created. The flags argument is a longword bit vector in
   which each bit corresponds to a flag. The $VADEF macro and the
   VADEF.H file define a symbolic name for each flag. You construct
   the flags argument by performing a logical OR operation on the
   symbol names for all desired flags.

   All bits in the flags argument are reserved for future use by VSI
   and should be specified as 0. The condition value SS$_IVVAFLG is
   returned if any bits are set.
 

return_va_64

   OpenVMS usage:address
   type:         quadword address
   access:       write only
   mechanism:    by 32- or 64-bit reference
   The lowest process virtual address of a created virtual address
   range. The return_va_64 argument is the 32- or 64-bit virtual
   address of a naturally aligned quadword into which the service
   returns the virtual address.
 

return_length_64

   OpenVMS usage:byte count
   type:         quadword (unsigned)
   access:       write only
   mechanism:    by 32- or 64-bit reference
   The 32- or 64-bit virtual address of a naturally aligned quadword
   into which the service returns the length in bytes of the virtual
   address range created.