git: 9front

ref: 55b8b5ccf5cb157b492ed8e84e95fefb3d43ecee
dir: /sys/src/9/teg2/io.h/

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#define BUSUNKNOWN	(-1)

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