[src/trunk]: src/sys/arch/x86/include comment

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

details:   https://anonhg.NetBSD.org/src/rev/b5a37d063602
branches:  trunk
changeset: 779743:b5a37d063602
user:      yamt <yamt%NetBSD.org@localhost>
date:      Fri Jun 15 13:58:34 2012 +0000

description:
comment

diffstat:

 sys/arch/x86/include/pci_machdep_common.h |  9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diffs (23 lines):

diff -r 30439ca32e8e -r b5a37d063602 sys/arch/x86/include/pci_machdep_common.h
--- a/sys/arch/x86/include/pci_machdep_common.h Fri Jun 15 13:57:59 2012 +0000
+++ b/sys/arch/x86/include/pci_machdep_common.h Fri Jun 15 13:58:34 2012 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pci_machdep_common.h,v 1.8 2011/08/28 06:04:17 dyoung Exp $    */
+/*     $NetBSD: pci_machdep_common.h,v 1.9 2012/06/15 13:58:34 yamt Exp $      */
 
 /*
  * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
@@ -51,6 +51,13 @@
  * the read and write routines, but this would cause extra overhead.
  *
  * Mode 2 is historical and deprecated by the Revision 2.0 specification.
+ *
+ *
+ * Mode 1 tag:
+ *      31              24           16 15     11 10  8
+ *     +---------------------------------------------------------------+
+ *     |1|      0      |      BUS      |   DEV   |FUNC |       0       |
+ *     +---------------------------------------------------------------+
  */
 union x86_pci_tag_u {
        uint32_t mode1;