From 238edc1d467e84ebd56896977830f7100efcdffc Mon Sep 17 00:00:00 2001
From: Visa Hankala <visa@cvs.openbsd.org>
Date: Sat, 16 Jan 2016 11:15:38 +0000
Subject: Panic if someone boots the kernel by force without CPU 0. The system
 will not work without that core.

---
 sys/arch/octeon/octeon/machdep.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

(limited to 'sys')

diff --git a/sys/arch/octeon/octeon/machdep.c b/sys/arch/octeon/octeon/machdep.c
index c4c5d4874ef..d75818a5ffb 100644
--- a/sys/arch/octeon/octeon/machdep.c
+++ b/sys/arch/octeon/octeon/machdep.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: machdep.c,v 1.70 2015/12/02 14:56:15 visa Exp $ */
+/*	$OpenBSD: machdep.c,v 1.71 2016/01/16 11:15:37 visa Exp $ */
 
 /*
  * Copyright (c) 2009, 2010 Miodrag Vallat.
@@ -411,6 +411,15 @@ mips_init(__register_t a0, __register_t a1, __register_t a2 __unused,
 	DUMP_BOOT_INFO(config_flags, %#x);
 #endif
 
+	/*
+	 * It is possible to launch the kernel from the bootloader without
+	 * physical CPU 0. That does not really work, however, because of the
+	 * way how the kernel assigns and uses cpuids. Moreover, cnmac(4) is
+	 * hard coded to use CPU 0 for packet reception.
+	 */
+	if (!(octeon_boot_info->core_mask & 1))
+		panic("cannot run without physical CPU 0");
+
 	/*
 	 * Init message buffer.
 	 */
-- 
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