boot/zephyr: Kconfig for hooks enabling

Added global property which allows to enable hooks
implementations.

Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>

boot/zephyr/CMakeLists.txt

@@ -302,3 +302,27 @@ zephyr_library_sources(
   ${BOOT_DIR}/zephyr/arm_cleanup.c
 )
 endif()
+
+if(CONFIG_BOOT_IMAGE_ACCESS_HOOKS)
+
+  if(IS_ABSOLUTE ${CONFIG_BOOT_IMAGE_ACCESS_HOOKS_FILE})
+    if(EXISTS ${CONFIG_BOOT_IMAGE_ACCESS_HOOKS_FILE})
+      set(HOOKS_FILE ${CONFIG_BOOT_IMAGE_ACCESS_HOOKS_FILE})
+    endif()
+  elseif((DEFINED CONF_DIR) AND
+  (EXISTS ${CONF_DIR}/${CONFIG_BOOT_IMAGE_ACCESS_HOOKS_FILE}))
+    set(HOOKS_FILE ${CONF_DIR}/${CONFIG_BOOT_SIGNATURE_KEY_FILE})
+  else(EXISTS ${BOOT_DIR}/zephyr/${CONFIG_BOOT_IMAGE_ACCESS_HOOKS_FILE})
+    set(HOOKS_FILE ${BOOT_DIR}/zephyr/${CONFIG_BOOT_IMAGE_ACCESS_HOOKS_FILE})
+  endif()
+
+
+  if(DEFINED HOOKS_FILE)
+    zephyr_library_sources(
+      ${HOOKS_FILE}
+    )
+  else()
+    message(WARNING "Can't access hooks implementation file.")
+  endif()
+
+endif()

boot/zephyr/Kconfig

@@ -642,6 +642,24 @@ config BOOT_WATCHDOG_FEED
 	  Enables implementation of MCUBOOT_WATCHDOG_FEED() macro which is
 	  used to feed watchdog while doing time consuming operations.
 
+config BOOT_IMAGE_ACCESS_HOOKS
+	bool "Enable hooks for overriding MCUboot's native routines"
+	help
+	  Allow to provide procedures for override or extend native
+	  MCUboot's routines required for access the image data and the image
+	  update.
+
+config BOOT_IMAGE_ACCESS_HOOKS_FILE
+	string "Hooks implementation file path"
+	depends on BOOT_IMAGE_ACCESS_HOOKS
+	help
+	  Path to the file which implements hooks.
+	  You can use either absolute or relative path.
+	  In case relative path is used, the build system assumes that it starts
+	  from the directory where the MCUBoot KConfig configuration file is
+	  located. If the key file is not there, the build system uses relative
+	  path that starts from the zephyr port cmake directory (boot/zephyr/).
+
 endmenu
 
 config MCUBOOT_DEVICE_SETTINGS

boot/zephyr/include/mcuboot_config/mcuboot_config.h

@@ -163,6 +163,10 @@
 #define MCUBOOT_MGMT_CUSTOM_IMG_LIST
 #endif
 
+#ifdef CONFIG_BOOT_IMAGE_ACCESS_HOOKS
+#define MCUBOOT_IMAGE_ACCESS_HOOKS
+#endif
+
 /*
  * The configuration option enables direct image upload with the
  * serial recovery.