[src/trunk]: src/sys/arch/x86/include Make the comment about PDPpaddr more th...

[jym <jym%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/afb0ffeaa512
branches:  trunk
changeset: 756382:afb0ffeaa512
user:      jym <jym%NetBSD.org@localhost>
date:      Thu Jul 15 19:02:26 2010 +0000

description:
Make the comment about PDPpaddr more thorough.

diffstat:

 sys/arch/x86/include/pmap.h |  9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diffs (23 lines):

diff -r 957aa30d1502 -r afb0ffeaa512 sys/arch/x86/include/pmap.h
--- a/sys/arch/x86/include/pmap.h       Thu Jul 15 18:58:40 2010 +0000
+++ b/sys/arch/x86/include/pmap.h       Thu Jul 15 19:02:26 2010 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pmap.h,v 1.31 2010/07/06 20:50:35 cegger Exp $ */
+/*     $NetBSD: pmap.h,v 1.32 2010/07/15 19:02:26 jym Exp $    */
 
 /*
  *
@@ -183,7 +183,12 @@
  * global kernel variables
  */
 
-/* PDPpaddr: is the physical address of the kernel's PDP */
+/*
+ * PDPpaddr is the physical address of the kernel's PDP.
+ * - i386 non-PAE and amd64: PDPpaddr corresponds directly to the %cr3
+ * value associated to the kernel process, proc0.
+ * - Xen: it corresponds to the PFN of the kernel's PDP.
+ */
 extern u_long PDPpaddr;
 
 extern int pmap_pg_g;                  /* do we support PG_G? */