Int 1F Fn 17  U - C&t "superstate" Bios - Execute Far Proc Routine On Sup  [b]

   AH = 17h
   ES:DI -> far procedure

Return: all registers except AH,ES,DI

Note:  You can change the BIOS area (F000h:0000h - F000h:FFFFh) only through
     this function