[src/trunk]: src/sys/arch/amd64/amd64 Fix boot -c or -d by avoiding ipi handl...

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

details:   https://anonhg.NetBSD.org/src/rev/4cf00161bbb0
branches:  trunk
changeset: 969733:4cf00161bbb0
user:      christos <christos%NetBSD.org@localhost>
date:      Sat Feb 29 15:00:28 2020 +0000

description:
Fix boot -c or -d by avoiding ipi handling before the vector is initialized.

diffstat:

 sys/arch/amd64/amd64/db_interface.c |  8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diffs (29 lines):

diff -r 8eb4423c3a50 -r 4cf00161bbb0 sys/arch/amd64/amd64/db_interface.c
--- a/sys/arch/amd64/amd64/db_interface.c       Sat Feb 29 14:44:44 2020 +0000
+++ b/sys/arch/amd64/amd64/db_interface.c       Sat Feb 29 15:00:28 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: db_interface.c,v 1.36 2019/02/14 07:12:40 cherry Exp $ */
+/*     $NetBSD: db_interface.c,v 1.37 2020/02/29 15:00:28 christos Exp $       */
 
 /*
  * Mach Operating System
@@ -33,7 +33,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: db_interface.c,v 1.36 2019/02/14 07:12:40 cherry Exp $");
+__KERNEL_RCSID(0, "$NetBSD: db_interface.c,v 1.37 2020/02/29 15:00:28 christos Exp $");
 
 #include "opt_ddb.h"
 #include "opt_multiprocessor.h"
@@ -150,7 +150,9 @@
                xen_broadcast_ipi(XEN_IPI_DDB);
 #else
 #if NLAPIC > 0
-               x86_ipi(ddb_vec, LAPIC_DEST_ALLEXCL, LAPIC_DLMODE_FIXED);
+               if (ddb_vec != 0)
+                       x86_ipi(ddb_vec, LAPIC_DEST_ALLEXCL,
+                           LAPIC_DLMODE_FIXED);
 #endif
 #endif /* XENPV */
        }