PERFORCE change 31688 for review

[Peter Wemm]

http://perforce.freebsd.org/chv.cgi?CH=31688

Change 31688 by peter at peter_hammer on 2003/05/22 23:16:36

	add some comments

Affected files ...

.. //depot/projects/hammer/sys/amd64/include/pmap.h#13 edit

Differences ...

==== //depot/projects/hammer/sys/amd64/include/pmap.h#13 (text+ko) ====

@@ -114,10 +114,10 @@
  */
 #define	PML4PML4I	(NPML4EPG/2)	/* Index of recursive pml4 mapping */
 
-#define	KPML4I		(NPML4EPG-1)
-#define DMPML4I		(KPML4I-1)
+#define	KPML4I		(NPML4EPG-1)	/* Top 512GB for KVM */
+#define	DMPML4I		(KPML4I-1)	/* Next 512GB down for direct map */
 
-#define	KPDPI		(NPDPEPG-1)
+#define	KPDPI		(NPDPEPG-1)	/* kernbase at -1GB */
 
 /*
  * XXX doesn't really belong here I guess...