modules: mbedtls: move CMakeLists.txt. into the main tree

We move the Zephyr-specific CMakeLists.txt file into
the main Zephyr tree. We also move the zephyr_init.c
source file.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>

modules/Kconfig

@@ -18,7 +18,6 @@ source "modules/Kconfig.imx"
 source "modules/Kconfig.infineon"
 source "modules/Kconfig.libmetal"
 source "modules/Kconfig.loramac-node"
-source "modules/Kconfig.mbedtls"
 source "modules/Kconfig.mcux"
 source "modules/Kconfig.microchip"
 source "modules/Kconfig.nuvoton"
@@ -51,6 +50,9 @@ comment "Unavailable modules, please install those via the project manifest."
 comment "hal_nordic module not available."
 	depends on !ZEPHYR_HAL_NORDIC_MODULE
 
+comment "mbedtls module not available."
+	depends on !ZEPHYR_MBEDTLS_MODULE
+
 comment "Trusted-firmware-m module not available."
 	depends on !ZEPHYR_TRUSTED_FIRMWARE_M_MODULE
 

modules/mbedtls/CMakeLists.txt

@@ -0,0 +1,56 @@
+if(CONFIG_MBEDTLS)
+zephyr_interface_library_named(mbedTLS)
+
+if(CONFIG_MBEDTLS_BUILTIN)
+  target_compile_definitions(mbedTLS INTERFACE
+	  MBEDTLS_CONFIG_FILE="${CONFIG_MBEDTLS_CFG_FILE}"
+	)
+
+  target_include_directories(mbedTLS INTERFACE
+    ${ZEPHYR_CURRENT_MODULE_DIR}/include
+    ${ZEPHYR_CURRENT_MODULE_DIR}/configs
+	)
+
+  zephyr_library()
+
+  file(GLOB
+    mbedtls_sources # This is an output parameter
+      ${ZEPHYR_CURRENT_MODULE_DIR}/library/*.c
+    )
+
+  zephyr_library_sources(
+    zephyr_init.c
+    ${mbedtls_sources}
+  )
+
+  zephyr_library_app_memory(k_mbedtls_partition)
+if(CONFIG_ARCH_POSIX AND CONFIG_ASAN AND NOT CONFIG_64BIT)
+  # i386 assembly code used in MBEDTLS does not compile with size optimization
+  # if address sanitizer is enabled, as such switch default optimization level
+  # to speed
+  set_property(SOURCE ${ZEPHYR_CURRENT_MODULE_DIR}/library/bignum.c APPEND PROPERTY COMPILE_OPTIONS
+      "${OPTIMIZE_FOR_SPEED_FLAG}")
+endif ()
+
+  zephyr_library_link_libraries(mbedTLS)
+else()
+  assert(CONFIG_MBEDTLS_LIBRARY "MBEDTLS was enabled, but neither BUILTIN or LIBRARY was selected.")
+
+  # NB: CONFIG_MBEDTLS_LIBRARY is not regression tested and is
+  # therefore susceptible to bit rot
+
+  target_include_directories(mbedTLS INTERFACE
+	${CONFIG_MBEDTLS_INSTALL_PATH}
+	)
+
+  zephyr_link_libraries(
+    mbedtls_external
+    -L${CONFIG_MBEDTLS_INSTALL_PATH}
+    gcc
+    )
+  # Lib mbedtls_external depends on libgcc (I assume?) so to allow
+  # mbedtls_external to link with gcc we need to ensure it is placed
+  # after mbedtls_external on the linkers command line.
+endif()
+
+endif()

modules/mbedtls/Kconfig

@@ -3,6 +3,9 @@
 # Copyright (c) 2016 Intel Corporation
 # SPDX-License-Identifier: Apache-2.0
 
+config ZEPHYR_MBEDTLS_MODULE
+	bool
+
 menuconfig MBEDTLS
 	bool "mbedTLS Support"
 	help

modules/mbedtls/zephyr_init.c

@@ -0,0 +1,52 @@
+/** @file
+ * @brief mbed TLS initialization
+ *
+ * Initialize the mbed TLS library like setup the heap etc.
+ */
+
+/*
+ * Copyright (c) 2017 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <init.h>
+#include <app_memory/app_memdomain.h>
+
+#if defined(CONFIG_MBEDTLS)
+#if !defined(CONFIG_MBEDTLS_CFG_FILE)
+#include "mbedtls/config.h"
+#else
+#include CONFIG_MBEDTLS_CFG_FILE
+#endif /* CONFIG_MBEDTLS_CFG_FILE */
+#endif
+
+#if defined(CONFIG_MBEDTLS_ENABLE_HEAP) && \
+					defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
+#include <mbedtls/memory_buffer_alloc.h>
+
+#if !defined(CONFIG_MBEDTLS_HEAP_SIZE)
+#error "Please set heap size to be used. Set value to CONFIG_MBEDTLS_HEAP_SIZE \
+option."
+#endif
+
+static unsigned char _mbedtls_heap[CONFIG_MBEDTLS_HEAP_SIZE];
+
+static void init_heap(void)
+{
+	mbedtls_memory_buffer_alloc_init(_mbedtls_heap, sizeof(_mbedtls_heap));
+}
+#else
+#define init_heap(...)
+#endif /* CONFIG_MBEDTLS_ENABLE_HEAP && MBEDTLS_MEMORY_BUFFER_ALLOC_C */
+
+static int _mbedtls_init(const struct device *device)
+{
+	ARG_UNUSED(device);
+
+	init_heap();
+
+	return 0;
+}
+
+SYS_INIT(_mbedtls_init, POST_KERNEL, 0);