git: 9front

ref: 6ab9e11da20a152076c1201c0f1df2ea8469ebb0
dir: /sys/src/9/teg2/io.h/

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#define BUSUNKNOWN	(-1)

#define PCIWINDOW	0
#define PCIWADDR(va)	(PADDR(va)+PCIWINDOW)