tests/kernel: verify RUNTIME_NMI at runtime

This patch introduces a test that verifies the behavior of
CONFIG_RUNTIME_NMI at runtime.

The test is meant to be only for ARM Cortex-M targets.

Change-Id: I805a88e67fe47d396ac9e29e1275e5452a4b8a36
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@linaro.org>

tests/kernel/test_arm_runtime_nmi/Makefile

@@ -0,0 +1,4 @@
+BOARD ?= qemu_cortex_m3
+CONF_FILE = prj.conf
+
+include $(ZEPHYR_BASE)/Makefile.inc

tests/kernel/test_arm_runtime_nmi/README.txt

@@ -0,0 +1,45 @@
+Title: Test to verify the behavior of CONFIG_RUNTIME_NMI at runtime (ARM Only)
+
+Description:
+
+This test verifies the behavior of CONFIG_RUNTIME_NMI at runtime. Only for
+ARM Cortex-M targets.
+
+---------------------------------------------------------------------------
+
+Building and Running Project:
+
+This project outputs to the console.  It can be built and executed on QEMU as
+follows:
+
+    make qemu
+
+---------------------------------------------------------------------------
+
+Troubleshooting:
+
+Problems caused by out-dated project information can be addressed by
+issuing one of the following commands then rebuilding the project:
+
+    make clean          # discard results of previous builds
+                        # but keep existing configuration info
+or
+    make pristine       # discard results of previous builds
+                        # and restore pre-defined configuration info
+
+---------------------------------------------------------------------------
+
+Sample Output:
+
+Trigger NMI in 10s: 0 s
+Trigger NMI in 10s: 1 s
+Trigger NMI in 10s: 2 s
+Trigger NMI in 10s: 3 s
+Trigger NMI in 10s: 4 s
+Trigger NMI in 10s: 5 s
+Trigger NMI in 10s: 6 s
+Trigger NMI in 10s: 7 s
+Trigger NMI in 10s: 8 s
+Trigger NMI in 10s: 9 s
+NMI received (test_handler_isr)! Rebooting...
+...

tests/kernel/test_arm_runtime_nmi/prj.conf

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+CONFIG_RUNTIME_NMI=y

tests/kernel/test_arm_runtime_nmi/src/Makefile

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+ccflags-y += -I${ZEPHYR_BASE}/tests/include
+
+obj-y = main.o

tests/kernel/test_arm_runtime_nmi/src/main.c

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+/*
+ * Copyright (c) 2016 Linaro Limited
+ *
+ * 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.
+ */
+
+ /**
+  * @brief Test to verify the behavior of CONFIG_RUNTIME_NMI at runtime.
+  */
+
+#include <zephyr.h>
+#include <misc/printk.h>
+#include <misc/reboot.h>
+
+#include <tc_util.h>
+
+extern void _NmiHandlerSet(void (*pHandler)(void));
+
+static void nmi_test_isr(void)
+{
+	printk("NMI received (test_handler_isr)! Rebooting...\n");
+	/* ISR triggered correctly: test passed! */
+	TC_END_RESULT(TC_PASS);
+	TC_END_REPORT(TC_PASS);
+}
+
+void main(void)
+{
+	uint32_t i = 0;
+
+	/* Configure the NMI isr */
+	_NmiHandlerSet(nmi_test_isr);
+
+	for (i = 0; i < 10; i++) {
+		printk("Trigger NMI in 10s: %d s\n", i);
+		k_sleep(1000);
+	}
+
+	/* Trigger NMI: Should fire immediately */
+	_ScbNmiPend();
+}

tests/kernel/test_arm_runtime_nmi/testcase.ini

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+[test]
+tags = core bat_commit
+arch_whitelist = arm