git: 9front

ref: 014f77a83c9c987ca1a8a44ba77a1677f7c65652
dir: /sys/src/9/teg2/io.h/

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#define BUSUNKNOWN	(-1)

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