tests/kernel: Simple test for multiprocessor start API

Starts the second CPU and verifies that it can set a variable while we
spin on the first.

Signed-off-by: Andy Ross <andrew.j.ross@intel.com>

tests/kernel/mp/CMakeLists.txt

@@ -0,0 +1,4 @@
+include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
+project(NONE)
+
+target_sources(app PRIVATE src/main.c)

tests/kernel/mp/prj.conf

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+CONFIG_ZTEST=y

tests/kernel/mp/src/main.c

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+/*
+ * Copyright (c) 2018 Intel Corporation.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr.h>
+#include <tc_util.h>
+#include <ztest.h>
+#include <kernel.h>
+
+#define CPU1_STACK_SIZE 1024
+
+K_THREAD_STACK_DEFINE(cpu1_stack, CPU1_STACK_SIZE);
+
+int cpu_arg;
+
+volatile int cpu_running;
+
+void cpu1_fn(int key, void *arg)
+{
+	zassert_true(key, "bad irq key");
+	zassert_true(arg == &cpu_arg && *(int *)arg == 12345, "wrong arg");
+
+	cpu_running = 1;
+
+	while (1) {
+	}
+}
+
+void test_mp_start(void)
+{
+	cpu_arg = 12345;
+
+	_arch_start_cpu(1, cpu1_stack, CPU1_STACK_SIZE, cpu1_fn, &cpu_arg);
+
+	while (!cpu_running) {
+	}
+
+	zassert_true(cpu_running, "cpu1 didn't start");
+}
+
+void test_main(void)
+{
+	ztest_test_suite(test_mp,
+			 ztest_unit_test(test_mp_start));
+	ztest_run_test_suite(test_mp);
+}

tests/kernel/mp/testcase.yaml

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+tests:
+  test:
+    platform_whitelist: esp32