--- src/sys/cpu/i386/include/param.h	2006/11/07 06:43:22	1.10
+++ src/sys/cpu/i386/include/param.h	2006/12/04 18:04:00	1.11
@@ -101,11 +101,15 @@
 #define ALIGNBYTES	_ALIGNBYTES
 #define ALIGN(p)	_ALIGN(p)
 
-#define PAGE_SHIFT	12		/* LOG2(PAGE_SIZE) */
-#define PAGE_SIZE	(1<<PAGE_SHIFT)	/* bytes/page */
+#define PAGE_SHIFT	12
+#define PAGE_SIZE	(1<<PAGE_SHIFT)	/* bytes per mmu page (level 2) */
 #define PAGE_MASK	(PAGE_SIZE-1)
 #define NPTEPG		(PAGE_SIZE/(sizeof (pt_entry_t)))
 
+#define SEG_SHIFT	22
+#define SEG_SIZE	(1<<SEG_SHIFT)	/* bytes per mmu segment (level 1) */
+#define SEG_MASK	(SEG_SIZE-1)
+
 #define NPDEPG		(PAGE_SIZE/(sizeof (pd_entry_t)))
 #define PDRSHIFT	22		/* LOG2(NBPDR) */
 #define NBPDR		(1<<PDRSHIFT)	/* bytes/page dir */