feat(plat/mediatek/build_helpers): introduce mtk makefile
In order to modularize software libraries and platform drivers,
we create makefile helpers to treat a folder as a basic compile
unit.
Each module has a build rule (rules.mk) to describe driver and software
library source codes to be built in.
Change-Id: Ib2113b259dc97937b7295b265509025b43b14077
diff --git a/plat/mediatek/build_helpers/mtk_build_helpers_epilogue.mk b/plat/mediatek/build_helpers/mtk_build_helpers_epilogue.mk
new file mode 100644
index 0000000..22a546c
--- /dev/null
+++ b/plat/mediatek/build_helpers/mtk_build_helpers_epilogue.mk
@@ -0,0 +1,30 @@
+#
+# Copyright (c) 2022, MediaTek Inc. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+# Expand include modules
+$(eval $(call INCLUDE_MODULES,$(MODULES-y)))
+
+# Make next section align to page size
+ifneq ($(MTK_EXTRA_LINKERFILE),)
+$(eval $(call MAKE_LINKERFILE_ITER,$(MTK_LINKERFILE_SOURCE),bl31))
+
+# EXTRA_GENERATED_LINKER_SCRIPT is a global variable of derived linker
+# script list(from MTK_LINKERFILE_SOURCE) after MAKE_LINKERFILE_ITER
+# function call
+EXTRA_LINKERFILE += ${EXTRA_GENERATED_LINKER_SCRIPT}
+
+# Expand derived linker script as build target
+$(eval $(call MAKE_LD_ITER, $(EXTRA_GENERATED_LINKER_SCRIPT),$(MTK_LINKERFILE_SOURCE),bl31))
+
+# mtk_align.ld MUST BE THE LAST LINKER SCRIPT!
+EXTRA_LINKERFILE += ${MTK_PLAT}/include/mtk_align.ld
+
+# bl31.ld should depend on EXTRA_LINKERFILE
+$(eval ${BUILD_PLAT}/bl31/bl31.ld: ${EXTRA_LINKERFILE})
+EXTRA_LINKERFILE := $(addprefix -T,$(EXTRA_LINKERFILE))
+else
+EXTRA_LINKERFILE :=
+endif