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bcm64: increase maximum segment size to 8GB

make it possible for one process to use all
of physical memory.

--- a/sys/src/9/bcm64/mem.h

+++ b/sys/src/9/bcm64/mem.h

@@ -87,7 +87,7 @@

 #define	PTEMAPMEM	(1024*1024)

 #define	PTEPERTAB	(PTEMAPMEM/BY2PG)

-#define	SEGMAPSIZE	1984

+#define	SEGMAPSIZE	8192

 #define	SSEGMAPSIZE	16

 #define	PPN(x)		((x)&~(BY2PG-1))