machine-independent code for more sane access to bus resources.
Defines:
bus_{io,mem}_{map,unmap}
bus_{io,mem}_{read,write}_{1,2,4,8}
bus_io_{read,write}_multi_{1,2,4,8}
functions, and several types to go with them.
Note: The bus_io_*_8 functions are not supported.
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