{  Define the type definitions of the buffer descriptor for locking and
{  unlocking pages when doing physical io.

  TYPE
    mmt$buffer_descriptor = record
      page_count: mmt$rma_list_length,
      case buffer_descriptor_type: mmt$buffer_descriptor_type of
      = mmc$bd_paging_io, mmc$bd_explicit_io =
        sva: ost$system_virtual_address,
      = mmc$bd_job_swapping_io =
        ijl_ordinal: jmt$ijl_ordinal,
      casend,
    recend,

    mmt$buffer_descriptor_type = (mmc$bd_paging_io, mmc$bd_job_swapping_io,
      mmc$bd_explicit_io);

*copyc jmt$ijl_ordinal
*copyc MMT$RMA_LIST
*copyc OST$HARDWARE_SUBRANGES
