test_irq_offload: unit test for running functions in IRQ context

This is used in many other test cases. However when implementing this
function it's helpful to have a testcase dedicated for it, without
dependencies on other kernel objects.

Change-Id: I66a7cdd0b13712665384d5ad4e79050c82d32e3a
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>

tests/kernel/test_irq_offload/Makefile

@@ -0,0 +1,6 @@
+KERNEL_TYPE = nano
+BOARD ?= qemu_x86
+CONF_FILE = prj.conf
+
+
+include ${ZEPHYR_BASE}/Makefile.inc

tests/kernel/test_irq_offload/README

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+This test case verifies the correctness of irq_offload(), an important
+routine used in many other test cases for running a function in interrupt
+context, on the IRQ stack.

tests/kernel/test_irq_offload/prj.conf

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+CONFIG_IRQ_OFFLOAD=y

tests/kernel/test_irq_offload/src/Makefile

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

tests/kernel/test_irq_offload/src/main.c

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+/*
+ * Copyright (c) 2015 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.
+ */
+
+#include <zephyr.h>
+#include <tc_util.h>
+#include <nano_private.h>
+#include <irq_offload.h>
+
+volatile uint32_t sentinel;
+#define SENTINEL_VALUE 0xDEADBEEF
+
+void offload_function(void *param)
+{
+	uint32_t x = (uint32_t)param;
+
+	TC_PRINT("offload_function running\n");
+
+	/* Make sure we're in IRQ context */
+	if (!_IS_IN_ISR()) {
+		TC_PRINT("Not in IRQ context!\n");
+		return;
+	}
+
+	sentinel = x;
+}
+
+void main(void)
+{
+	int rv = TC_PASS;
+
+	TC_START("test_irq_offload");
+
+	irq_offload(offload_function, (void *)SENTINEL_VALUE);
+
+	if (sentinel != SENTINEL_VALUE) {
+		TC_PRINT("irq_offload() didn't work properly\n");
+		rv = TC_FAIL;
+	}
+
+	TC_END_RESULT(rv);
+	TC_END_REPORT(rv);
+}

tests/kernel/test_irq_offload/testcase.ini

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+[test]
+tags = core
+kernel = nano