Build system refactoring

The source tree is configured for a specific target as defined in the
targets directory.

The common target components are defined in targets/common. Targets
for real platform should include this directory to get the default
target libraries setup.

Change-Id: I7fced4bfacec97432cbbd4125bd5b4cdd21122e3

3 files changed, 121 insertions, 0 deletions

diff --git a/targets/common/CMakeLists.txt b/targets/common/CMakeLists.txt
new file mode 100644
index 0000000..fa9b953
--- /dev/null
+++ b/targets/common/CMakeLists.txt
@@ -0,0 +1,63 @@
+#
+# Copyright (c) 2021 Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# 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
+#
+# 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.
+#
+
+#############################################################################
+# Core software
+#############################################################################
+
+set(ETHOSU_CORE_SOFTWARE_PATH "${CMAKE_CURRENT_LIST_DIR}/../../../core_software" CACHE PATH "Path to Arm Ethos-U Core Software")
+
+set(CORE_SOFTWARE_RTOS "All" CACHE STRING "")
+
+add_subdirectory(${ETHOSU_CORE_SOFTWARE_PATH} core_software)
+
+###############################################################################
+# Target
+#
+# ethosu_target_init       # Init and drivers
+#     |
+#     v
+# ethosu_target_startup    # CMSIS startup
+#     |
+#     v
+# ethosu_target_link       # Target linker script
+#     |
+#     v
+# ethosu_target_common     # Common for all targets
+###############################################################################
+
+# Common
+add_library(ethosu_target_common INTERFACE)
+target_include_directories(ethosu_target_common INTERFACE include)
+
+# Link
+add_library(ethosu_target_link INTERFACE)
+target_link_libraries(ethosu_target_link INTERFACE ethosu_target_common)
+
+# Startup
+add_library(ethosu_target_startup INTERFACE)
+target_link_libraries(ethosu_target_startup INTERFACE ethosu_target_link)
+
+target_link_libraries(ethosu_target_startup INTERFACE $<TARGET_OBJECTS:cmsis_startup>)
+add_dependencies(ethosu_target_startup $<TARGET_OBJECTS:cmsis_startup>)
+
+# Init
+add_library(ethosu_target_init INTERFACE)
+target_link_libraries(ethosu_target_init INTERFACE ethosu_target_startup)
+target_sources(ethosu_target_init INTERFACE src/init.cpp)
+
diff --git a/targets/common/include/target.hpp b/targets/common/include/target.hpp
new file mode 100644
index 0000000..abe3fdc
--- /dev/null
+++ b/targets/common/include/target.hpp
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2020 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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
+ *
+ * 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.
+ */
+
+#ifndef _TARGET_HPP_
+#define _TARGET_HPP_
+
+#ifdef __cplusplus
+
+namespace EthosU {
+
+/**
+ * Initialize the target platform.
+ */
+void targetSetup();
+
+} // namespace EthosU
+
+#endif
+
+#endif
diff --git a/targets/common/src/init.cpp b/targets/common/src/init.cpp
new file mode 100644
index 0000000..6eecc42
--- /dev/null
+++ b/targets/common/src/init.cpp
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2020 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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
+ *
+ * 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 <target.hpp>
+
+__attribute__((constructor)) void init() {
+    EthosU::targetSetup();
+}