DS> zeroed in on your VioGetPhysBuf.  With the exception of 
 DS> forming the pointer manually rather than through a 
 DS> macro it is essentially the same.  So I now have 4 

Perhaps I am just showing my inexperience with nonlinear addressing, 3
years of C cobwebs and rust, or just plain being naive... but shouldn't the
following two pieces of code generate the same result ?  The first one
(based on the example you posted) works, the second (very similar to the
MAKEP macro) does not.

  ptr1616 = (void * _Seg16) ( phys.asel[0] << 16 );
  VGARAMptr = (void *) ptr1616;

  VGARAMptr = (void *) ((void * _Seg16) ( phys.asel[0] << 16 ));

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