Add support for printing version at runtime

Print out Trusted Firmware version at runtime at each BL stage.
Message consists of TF version as defined statically in the Makefile
(e.g. v0.4), build mode (debug|release) and a customizable build
string:

  1. By defining BUILD_STRING in command line when building TF
  2. Default string is git commit ID
  3. Empty if git meta-data is not available

Fixes ARM-software/tf-issues#203

Change-Id: I5c5ba438f66ab68810427d76b49c5b9177a957d6

Makefile

@@ -28,6 +28,12 @@
 # POSSIBILITY OF SUCH DAMAGE.
 #
 
+#
+# Trusted Firmware Version
+#
+VERSION_MAJOR		:= 0
+VERSION_MINOR		:= 4
+
 #
 # Default values for build configurations
 #
@@ -76,6 +82,13 @@ else
 	BUILD_TYPE	:=	release
 endif
 
+# Default build string (git branch and commit)
+ifeq (${BUILD_STRING},)
+	BUILD_STRING	:=	$(shell git log -n 1 --pretty=format:"%h")
+endif
+
+VERSION_STRING		:=	v${VERSION_MAJOR}.${VERSION_MINOR}(${BUILD_TYPE}):${BUILD_STRING}
+
 BL_COMMON_SOURCES	:=	common/bl_common.c			\
 				common/debug.c				\
 				common/tf_printf.c			\
@@ -377,7 +390,8 @@ $(BUILD_DIR) :
 
 $(ELF) : $(OBJS) $(LINKERFILE)
 	@echo "  LD      $$@"
-	@echo 'const char build_message[] = "Built : "__TIME__", "__DATE__;' | \
+	@echo 'const char build_message[] = "Built : "__TIME__", "__DATE__; \
+	       const char version_string[] = "${VERSION_STRING}";' | \
 		$$(CC) $$(CFLAGS) -xc - -o $(BUILD_DIR)/build_message.o
 	$$(Q)$$(LD) -o $$@ $$(LDFLAGS) -Map=$(MAPFILE) --script $(LINKERFILE) \
 					$(BUILD_DIR)/build_message.o $(OBJS)

bl1/bl1_main.c

@@ -130,7 +130,8 @@ void bl1_main(void)
 
 	/* Announce our arrival */
 	tf_printf(FIRMWARE_WELCOME_STR);
-	tf_printf("%s\n\r", build_message);
+	tf_printf("%s\n", version_string);
+	tf_printf("%s\n", build_message);
 
 	SET_PARAM_HEAD(&bl2_image_info, PARAM_IMAGE_BINARY, VERSION_1, 0);
 	SET_PARAM_HEAD(&bl2_ep, PARAM_EP, VERSION_1, 0);

bl2/bl2_main.c

@@ -195,7 +195,8 @@ void bl2_main(void)
 	/* Perform platform setup in BL2 */
 	bl2_platform_setup();
 
-	tf_printf("BL2 %s\n\r", build_message);
+	tf_printf("BL2 %s\n", version_string);
+	tf_printf("BL2 %s\n", build_message);
 
 	/*
 	 * Load the subsequent bootloader images

bl31/bl31_main.c

@@ -77,7 +77,8 @@ void bl31_main(void)
 	/* Perform platform setup in BL1 */
 	bl31_platform_setup();
 
-	tf_printf("BL31 %s\n\r", build_message);
+	tf_printf("BL31 %s\n", version_string);
+	tf_printf("BL31 %s\n", build_message);
 
 	/* Initialise helper libraries */
 	bl31_lib_init();

bl32/tsp/tsp_main.c

@@ -120,7 +120,8 @@ uint64_t tsp_main(void)
 	tsp_stats[linear_id].cpu_on_count++;
 
 	spin_lock(&console_lock);
-	tf_printf("TSP %s\n\r", build_message);
+	tf_printf("TSP %s\n", version_string);
+	tf_printf("TSP %s\n", build_message);
 	INFO("Total memory base : 0x%x\n", (unsigned long)BL32_TOTAL_BASE);
 	INFO("Total memory size : 0x%x bytes\n",
 			 (unsigned long)(BL32_TOTAL_LIMIT - BL32_TOTAL_BASE));

include/common/bl_common.h

@@ -210,6 +210,7 @@ int load_image(meminfo_t *mem_layout,
 	       image_info_t *image_data,
 	       entry_point_info_t *entry_point_info);
 extern const char build_message[];
+extern const char version_string[];
 
 void reserve_mem(uint64_t *free_base, size_t *free_size,
 		uint64_t addr, size_t size);