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Use <powerpc/oea/bat.h> exclusively and remove <machine/bat.h> and <powerpc/bat.h>. Remove unneeded <machine/cpufunc.h>. To insure 1:1 correspondence of <powerpc/FOO.h> to <machine/FOO.h> include "../../powerpc/include/Makefile" in "arch/FOO/include/Makefile". Incororpate <byte_swap.h> into <bswap.h> and then byte_swap.h