[src/trunk]: src/sys/arch/evbarm/rpi Firmware after May 8, 2017 places APs in...

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

details:   https://anonhg.NetBSD.org/src/rev/534073585b72
branches:  trunk
changeset: 357296:534073585b72
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sat Nov 04 14:47:06 2017 +0000

description:
Firmware after May 8, 2017 places APs in WFE state at boot. Add a "sev"
after writing the start vector, otherwise secondary CPUs will not boot.

diffstat:

 sys/arch/evbarm/rpi/rpi_machdep.c |  7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diffs (28 lines):

diff -r 7eff2e6d7e8e -r 534073585b72 sys/arch/evbarm/rpi/rpi_machdep.c
--- a/sys/arch/evbarm/rpi/rpi_machdep.c Sat Nov 04 14:20:12 2017 +0000
+++ b/sys/arch/evbarm/rpi/rpi_machdep.c Sat Nov 04 14:47:06 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: rpi_machdep.c,v 1.80 2017/08/16 20:54:19 jmcneill Exp $        */
+/*     $NetBSD: rpi_machdep.c,v 1.81 2017/11/04 14:47:06 jmcneill Exp $        */
 
 /*-
  * Copyright (c) 2012 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: rpi_machdep.c,v 1.80 2017/08/16 20:54:19 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: rpi_machdep.c,v 1.81 2017/11/04 14:47:06 jmcneill Exp $");
 
 #include "opt_arm_debug.h"
 #include "opt_bcm283x.h"
@@ -660,6 +660,9 @@
                }
        }
 
+       /* Wake up APs in case firmware has placed them in WFE state */
+       __asm __volatile("sev");
+
        for (int loop = 0; loop < 16; loop++) {
                if (arm_cpu_hatched == __BITS(arm_cpu_max - 1, 1))
                        break;