git: plan9front

ref: c220d0acc67b3f5e0e8af2bbe41fa8e367e6aa60
dir: /sys/src/9/teg2/io.h/

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#define BUSUNKNOWN	(-1)

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