{
{    This procedure is designed to be used to add a segment to a callers segment table when
{ the segment accessability is based upon the ASID of the segment. This is specifically
{ relevant to the SSR segment. The purpose of the procedure is to return to the caller
{ the segment number to be used in a pva to access the segment.
{
{     MMP$OPEN_ASID_BASED_SEGMENT (sdt_entry, sdtx_entry, segment_number, status)
{
{ SDT_ENTRY: (input) This parameter specifies the SDT entry for the segment. This SDT
{      entry will be added to the requestor's segment table.
{
{ SDTX_ENTRY: (input) This parameter specifies the SDTX entry for the segment. This
{      SDTX entry will be added to the requestor's segment table extended.
{
{ SEGMENT_NUMBER: (output) This parameter returns the segment number of the new segment.
{      It is relative only to the requestor's address space.
{
{ STATUS: (output) The parameter is the request status.
{
