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* Added indirect pio into the bus space stuff for the NEC PC-98. bus.hkato2000-03-291-0/+31
includes one of bus_at386.h and bus_pc98.h. Becuase only bus_pc98.h supports indirect pio and bus_at386.h is identical to old bus.h, there is no functional change in PC-AT's kernels. That is, it cannot cause performance loss. Submitted by: nyan Reviewed by: imp bde and luoqi provided useful comments for earlier version.
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