[src/trunk]: src/sys/arch/hp700/include Add some comments.

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

details:   https://anonhg.NetBSD.org/src/rev/eaaac0d8e6f8
branches:  trunk
changeset: 752152:eaaac0d8e6f8
user:      skrll <skrll%NetBSD.org@localhost>
date:      Wed Feb 17 11:33:51 2010 +0000

description:
Add some comments.

diffstat:

 sys/arch/hp700/include/cpu.h |  10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diffs (31 lines):

diff -r 25370fb0238c -r eaaac0d8e6f8 sys/arch/hp700/include/cpu.h
--- a/sys/arch/hp700/include/cpu.h      Wed Feb 17 11:31:39 2010 +0000
+++ b/sys/arch/hp700/include/cpu.h      Wed Feb 17 11:33:51 2010 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: cpu.h,v 1.36 2010/02/17 11:21:24 skrll Exp $   */
+/*     $NetBSD: cpu.h,v 1.37 2010/02/17 11:33:51 skrll Exp $   */
 
 /*     $OpenBSD: cpu.h,v 1.55 2008/07/23 17:39:35 kettenis Exp $       */
 
@@ -153,16 +153,18 @@
  */
 #if defined(HP8000_CPU) || defined(HP8200_CPU) || \
     defined(HP8500_CPU) || defined(HP8600_CPU)
+/* PA2.0 aliases */
 #define        HPPA_PGALIAS    0x00400000
-#define        HPPA_PGAMASK    0xffc00000
+#define        HPPA_PGAMASK    0xffc00000      /* PA bits 0-9 not used in index */
 #define        HPPA_PGAOFF     0x003fffff
 #else
+/* PA1.x aliases */
 #define        HPPA_PGALIAS    0x00100000
-#define        HPPA_PGAMASK    0xfff00000
+#define        HPPA_PGAMASK    0xfff00000      /* PA bits 0-11 not used in index */
 #define        HPPA_PGAOFF     0x000fffff
 #endif
 
-#define        HPPA_SPAMASK    0xf0f0f000
+#define        HPPA_SPAMASK    0xf0f0f000      /* PA bits 0-3,8-11,16-19 not used */
 
 #define        HPPA_IOSPACE    0xf0000000
 #define        HPPA_IOLEN      0x10000000