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

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

details:   https://anonhg.NetBSD.org/src/rev/8771528a7544
branches:  trunk
changeset: 779745:8771528a7544
user:      yamt <yamt%NetBSD.org@localhost>
date:      Fri Jun 15 14:07:44 2012 +0000

description:
comment

diffstat:

 sys/arch/x86/pci/pci_intr_machdep.c |  8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diffs (29 lines):

diff -r cd35a5021341 -r 8771528a7544 sys/arch/x86/pci/pci_intr_machdep.c
--- a/sys/arch/x86/pci/pci_intr_machdep.c       Fri Jun 15 14:02:41 2012 +0000
+++ b/sys/arch/x86/pci/pci_intr_machdep.c       Fri Jun 15 14:07:44 2012 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pci_intr_machdep.c,v 1.24 2012/06/15 14:02:41 yamt Exp $       */
+/*     $NetBSD: pci_intr_machdep.c,v 1.25 2012/06/15 14:07:44 yamt Exp $       */
 
 /*-
  * Copyright (c) 1997, 1998, 2009 The NetBSD Foundation, Inc.
@@ -73,7 +73,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pci_intr_machdep.c,v 1.24 2012/06/15 14:02:41 yamt Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pci_intr_machdep.c,v 1.25 2012/06/15 14:07:44 yamt Exp $");
 
 #include <sys/types.h>
 #include <sys/param.h>
@@ -144,6 +144,10 @@
        KASSERT(rawpin <= PCI_INTERRUPT_PIN_D);
        pci_decompose_tag(pc, pa->pa_tag, &bus, &dev, &func);
        if (mp_busses != NULL) {
+               /*
+                * Note: PCI_INTERRUPT_PIN_A == 1 where intr_find_mpmapping
+                * wants pci bus_pin encoding which uses INT_A == 0.
+                */
                if (intr_find_mpmapping(bus,
                    (dev << 2) | (rawpin - PCI_INTERRUPT_PIN_A), ihp) == 0) {
                        if (APIC_IRQ_LEGACY_IRQ(*ihp) == 0)