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        Get/set partial page map

        Entry:
          AH = 4Fh
          AL = subfunction
               00h get partial page map
                   DS:SI = Pointer to structure containing list of segments
                           whose mapping contexts are to be saved.
                   ES:DI = Pointer to array to receive page map
               01h set partial page map
                   DS:SI = Pointer to structure containing saved partial
                           page map.
               02h get size of partial page map
                   BX = number of mappable segments in the partial map
                        to be saved.

        Return:
          AH = status
               00h successful
               80h internal error
               81h hardware malfunction
               84h undefined function requested
               8Bh one of specified segments is not mappable
               8Fh undefined subfunction parameter
               A3h contents of partial page map corrupted or count of mappable
                segments exceeds total number of mappable segments in system
          AL = size of partial page map for subfunction 02h