arch: arm: move nmi to common location

The nmi_on_reset.S functions are used by all ARM platforms.  It
makes no sense to repeat the same code for all platforms.  Moving
the code from each SOC implementation to arch/arm/core.

The same treatment for the NMI_INIT() macro.  Moving it from a per
SOC implementation to the include/arch/arm/cortex_m/nmi.h.

Change-Id: I574d8880a44046cc7b9e1b635e80d6e83657b8c1
Signed-off-by: Dan Kalowsky <daniel.kalowsky@intel.com>

arch/arm/core/cortex_m/Makefile

@@ -4,7 +4,7 @@ ccflags-y +=-I$(srctree)/arch/$(ARCH)/platforms/$(SOC_NAME)
 asflags-y = $(ccflags-y)
 
 obj-y = vector_table.o reset.o \
-	prep_c.o scs.o scb.o nmi.o \
+	nmi_on_reset.o prep_c.o scs.o scb.o nmi.o \
 	exc_manage.o exc_wrapper.o
 
 obj-$(CONFIG_ERRNO) += errno.o

arch/arm/core/cortex_m/nmi_on_reset.S

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2013-2014 Wind River Systems, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file
+ * @brief Default basic NMI handler before the kernel is up
+ *
+ * Provide a default handler for NMI before the system is up. The default action
+ * is to hard hang, sleeping.
+ *
+ * This might be preferable than rebooting to help debugging, or because
+ * rebooting might trigger the exact same problem over and over.
+ */
+
+#define _ASMLANGUAGE
+
+#include <toolchain.h>
+#include <sections.h>
+
+_ASM_FILE_PROLOGUE
+
+GTEXT(_SysNmiOnReset)
+
+SECTION_FUNC(TEXT, _SysNmiOnReset)
+    wfi
+    b _SysNmiOnReset