git: 9front

ref: f31e1f4e4272beae2bc8a40ee2d5fb5a3061a3d3
dir: /sys/src/9/teg2/io.h/

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#define BUSUNKNOWN	(-1)

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