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 region from which to address
   the VA space.

   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. Also, the region ID that a virtual address
   is in can be obtained by calling the $GET_REGION_INFO service,
   specifying the VA$_REGSUM_BY_VA function.
 

start_va_64

   OpenVMS usage:address
   type:         quadword address
   access:       read only
   mechanism:    by value
   The starting virtual address of the pages to be deleted. The
   specified address must be a CPU-specific page aligned address.
   If the region_id_64 argument specifies a shared page table region
   or if the start_va_64 argument lies within a shared page table
   region, the specified address must be a CPU-specific page table
   page aligned address.
 

length_64

   OpenVMS usage:byte count
   type:         quadword (unsigned)
   access:       read only
   mechanism:    by value
   Length of the virtual address space to be deleted. The length
   specified must be a multiple of CPU-specific pages. If the
   virtual address space is being deleted from a shared page table
   region, the specified length must be page table page aligned or
   include the last page in a memory-resident section.
 

acmode

   OpenVMS usage:access_mode
   type:         longword (unsigned)
   access:       read only
   mechanism:    by value
   Access mode associated with the call to $DELTVA_64. The acmode
   argument is a longword containing the access mode.

   The $PSLDEF macro in STARLET.MLB and the file PSLDEF.H in
   SYS$STARLET_C.TLB define the following symbols and their values
   for the four access modes:

   Value      Symbolic Name      Access Mode

   0          PSL$C_KERNEL       Kernel
   1          PSL$C_EXEC         Executive
   2          PSL$C_SUPER        Supervisor
   3          PSL$C_USER         User

   The most privileged access mode used is the access mode of the
   caller. The calling process can delete pages only if those pages
   are owned by an access mode equal to or less privileged than the
   access mode of the calling process.
 

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 the deleted virtual address
   range. The return_va_64 argument is the 32- or 64-bit virtual
   address of a naturally aligned quadword into which the $DELTVA_64
   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 $DELTVA_64 service returns the length in bytes of
   the virtual address range deleted.