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pc64: bump segment limit to 64GB

--- a/sys/src/9/pc64/mem.h

+++ b/sys/src/9/pc64/mem.h

@@ -128,9 +128,9 @@

  */

 #define	PTEMAPMEM	(1024*1024)	

 #define	PTEPERTAB	(PTEMAPMEM/BY2PG)

-#define	SEGMAPSIZE	1984

+#define	SEGMAPSIZE	65536

 #define	SSEGMAPSIZE	16

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

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

 /*

  *  physical MMU