--- /sys/src/9k/port/portdat.h
+++ /sys/src/9k/port/portdat.h
@@ -378,6 +378,8 @@ struct Physseg
 	uchar	lg2pgsize;		/* log2(size of pages in segment) */
 };
 
+#define	physsegpgsize(ps)	(1<<(ps)->lg2pgsize)
+
 struct Sema
 {
 	Rendez;