examples: add initial examples for RFC

Add hello_world and random(generate UUID) examples

Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Signed-off-by: Igor Opaniuk <igor.opaniuk@linaro.org>
diff --git a/hello_world/ta/Android.mk b/hello_world/ta/Android.mk
new file mode 100644
index 0000000..a1ff14a
--- /dev/null
+++ b/hello_world/ta/Android.mk
@@ -0,0 +1,4 @@
+LOCAL_PATH := $(call my-dir)
+
+local_module := 8aaaf200-2450-11e4-abe2-0002a5d5c51b.ta
+include $(BUILD_OPTEE_MK)
diff --git a/hello_world/ta/Makefile b/hello_world/ta/Makefile
new file mode 100644
index 0000000..3d2e6fc
--- /dev/null
+++ b/hello_world/ta/Makefile
@@ -0,0 +1,13 @@
+CFG_TEE_TA_LOG_LEVEL ?= 4
+CPPFLAGS += -DCFG_TEE_TA_LOG_LEVEL=$(CFG_TEE_TA_LOG_LEVEL)
+
+# The UUID for the Trusted Application
+BINARY=8aaaf200-2450-11e4-abe2-0002a5d5c51b
+
+-include $(TA_DEV_KIT_DIR)/mk/ta_dev_kit.mk
+
+ifeq ($(wildcard $(TA_DEV_KIT_DIR)/mk/ta_dev_kit.mk), )
+clean:
+	@echo 'Note: $$(TA_DEV_KIT_DIR)/mk/ta_dev_kit.mk not found, cannot clean TA'
+	@echo 'Note: TA_DEV_KIT_DIR=$(TA_DEV_KIT_DIR)'
+endif
diff --git a/hello_world/ta/hello_world_ta.c b/hello_world/ta/hello_world_ta.c
new file mode 100644
index 0000000..4aeacca
--- /dev/null
+++ b/hello_world/ta/hello_world_ta.c
@@ -0,0 +1,157 @@
+/*
+ * Copyright (c) 2016, Linaro Limited
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#define STR_TRACE_USER_TA "HELLO_WORLD"
+
+#include <tee_internal_api.h>
+#include <tee_internal_api_extensions.h>
+
+#include "hello_world_ta.h"
+
+/*
+ * Called when the instance of the TA is created. This is the first call in
+ * the TA.
+ */
+TEE_Result TA_CreateEntryPoint(void)
+{
+	DMSG("has been called");
+
+	return TEE_SUCCESS;
+}
+
+/*
+ * Called when the instance of the TA is destroyed if the TA has not
+ * crashed or panicked. This is the last call in the TA.
+ */
+void TA_DestroyEntryPoint(void)
+{
+	DMSG("has been called");
+}
+
+/*
+ * Called when a new session is opened to the TA. *sess_ctx can be updated
+ * with a value to be able to identify this session in subsequent calls to the
+ * TA. In this function you will normally do the global initialization for the
+ * TA.
+ */
+TEE_Result TA_OpenSessionEntryPoint(uint32_t param_types,
+		TEE_Param __maybe_unused params[4],
+		void __maybe_unused **sess_ctx)
+{
+	uint32_t exp_param_types = TEE_PARAM_TYPES(TEE_PARAM_TYPE_NONE,
+						   TEE_PARAM_TYPE_NONE,
+						   TEE_PARAM_TYPE_NONE,
+						   TEE_PARAM_TYPE_NONE);
+
+	DMSG("has been called");
+
+	if (param_types != exp_param_types)
+		return TEE_ERROR_BAD_PARAMETERS;
+
+	/* Unused parameters */
+	(void)&params;
+	(void)&sess_ctx;
+
+	/*
+	 * The DMSG() macro is non-standard, TEE Internal API doesn't
+	 * specify any means to logging from a TA.
+	 */
+	IMSG("Hello World!\n");
+
+	/* If return value != TEE_SUCCESS the session will not be created. */
+	return TEE_SUCCESS;
+}
+
+/*
+ * Called when a session is closed, sess_ctx hold the value that was
+ * assigned by TA_OpenSessionEntryPoint().
+ */
+void TA_CloseSessionEntryPoint(void __maybe_unused *sess_ctx)
+{
+	(void)&sess_ctx; /* Unused parameter */
+	IMSG("Goodbye!\n");
+}
+
+static TEE_Result inc_value(uint32_t param_types,
+	TEE_Param params[4])
+{
+	uint32_t exp_param_types = TEE_PARAM_TYPES(TEE_PARAM_TYPE_VALUE_INOUT,
+						   TEE_PARAM_TYPE_NONE,
+						   TEE_PARAM_TYPE_NONE,
+						   TEE_PARAM_TYPE_NONE);
+
+	DMSG("has been called");
+
+	if (param_types != exp_param_types)
+		return TEE_ERROR_BAD_PARAMETERS;
+
+	IMSG("Got value: %u from NW", params[0].value.a);
+	params[0].value.a++;
+	IMSG("Increase value to: %u", params[0].value.a);
+
+	return TEE_SUCCESS;
+}
+
+static TEE_Result dec_value(uint32_t param_types,
+	TEE_Param params[4])
+{
+	uint32_t exp_param_types = TEE_PARAM_TYPES(TEE_PARAM_TYPE_VALUE_INOUT,
+						   TEE_PARAM_TYPE_NONE,
+						   TEE_PARAM_TYPE_NONE,
+						   TEE_PARAM_TYPE_NONE);
+
+	DMSG("has been called");
+
+	if (param_types != exp_param_types)
+		return TEE_ERROR_BAD_PARAMETERS;
+
+	IMSG("Got value: %u from NW", params[0].value.a);
+	params[0].value.a--;
+	IMSG("Decrease value to: %u", params[0].value.a);
+
+	return TEE_SUCCESS;
+}
+/*
+ * Called when a TA is invoked. sess_ctx hold that value that was
+ * assigned by TA_OpenSessionEntryPoint(). The rest of the paramters
+ * comes from normal world.
+ */
+TEE_Result TA_InvokeCommandEntryPoint(void __maybe_unused *sess_ctx,
+			uint32_t cmd_id,
+			uint32_t param_types, TEE_Param params[4])
+{
+	(void)&sess_ctx; /* Unused parameter */
+
+	switch (cmd_id) {
+	case TA_HELLO_WORLD_CMD_INC_VALUE:
+		return inc_value(param_types, params);
+	case TA_HELLO_WORLD_CMD_DEC_VALUE:
+		return dec_value(param_types, params);
+	default:
+		return TEE_ERROR_BAD_PARAMETERS;
+	}
+}
diff --git a/hello_world/ta/include/hello_world_ta.h b/hello_world/ta/include/hello_world_ta.h
new file mode 100644
index 0000000..a25d0a4
--- /dev/null
+++ b/hello_world/ta/include/hello_world_ta.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2016, Linaro Limited
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef TA_HELLO_WORLD_H
+#define TA_HELLO_WORLD_H
+
+/* This UUID is generated with uuidgen
+   the ITU-T UUID generator at http://www.itu.int/ITU-T/asn1/uuid.html */
+#define TA_HELLO_WORLD_UUID { 0x8aaaf200, 0x2450, 0x11e4, \
+		{ 0xab, 0xe2, 0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b} }
+
+/* The Trusted Application Function ID(s) implemented in this TA */
+#define TA_HELLO_WORLD_CMD_INC_VALUE	0
+#define TA_HELLO_WORLD_CMD_DEC_VALUE	1
+
+#endif /*TA_HELLO_WORLD_H*/
diff --git a/hello_world/ta/sub.mk b/hello_world/ta/sub.mk
new file mode 100644
index 0000000..db2413c
--- /dev/null
+++ b/hello_world/ta/sub.mk
@@ -0,0 +1,6 @@
+global-incdirs-y += include
+#global-incdirs-y += ../host/include
+srcs-y += hello_world_ta.c
+
+# To remove a certain compiler flag, add a line like this
+#cflags-template_ta.c-y += -Wno-strict-prototypes
diff --git a/hello_world/ta/user_ta_header_defines.h b/hello_world/ta/user_ta_header_defines.h
new file mode 100644
index 0000000..016c402
--- /dev/null
+++ b/hello_world/ta/user_ta_header_defines.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2016, Linaro Limited
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * The name of this file must not be modified
+ */
+
+#ifndef USER_TA_HEADER_DEFINES_H
+#define USER_TA_HEADER_DEFINES_H
+
+#include <hello_world_ta.h> /* To get the TA_HELLO_WORLD_UUID define */
+
+#define TA_UUID 				TA_HELLO_WORLD_UUID
+
+#define TA_FLAGS				TA_FLAG_EXEC_DDR
+#define TA_STACK_SIZE			(2 * 1024)
+#define TA_DATA_SIZE			(32 * 1024)
+
+#define TA_CURRENT_TA_EXT_PROPERTIES \
+    { "gp.ta.description", USER_TA_PROP_TYPE_STRING, \
+        "Hello World TA" }, \
+    { "gp.ta.version", USER_TA_PROP_TYPE_U32, &(const uint32_t){ 0x0010 } }
+
+#endif /*USER_TA_HEADER_DEFINES_H*/