add a common mkbootimg.mk to quiet "KERNEL IS NOT SEANDROID ENFORCING" warning

* dtimage part is taken from vendor/cm

Change-Id: I243af7a0158ea64fe4c524e98f084b073944f5bb

mkbootimg.mk

@@ -0,0 +1,75 @@
+# Copyright (C) 2017 The LineageOS Project
+#
+# 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
+#
+# http://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.
+
+LOCAL_PATH := $(call my-dir)
+
+ifeq ($(strip $(BOARD_KERNEL_SEPARATED_DT)),true)
+ifneq ($(strip $(BOARD_KERNEL_PREBUILT_DT)),true)
+ifeq ($(strip $(BUILD_TINY_ANDROID)),true)
+include device/qcom/common/dtbtool/Android.mk
+endif
+
+ifeq ($(strip $(TARGET_CUSTOM_DTBTOOL)),)
+DTBTOOL_NAME := dtbToolCM
+else
+DTBTOOL_NAME := $(TARGET_CUSTOM_DTBTOOL)
+endif
+
+DTBTOOL := $(HOST_OUT_EXECUTABLES)/$(DTBTOOL_NAME)$(HOST_EXECUTABLE_SUFFIX)
+
+INSTALLED_DTIMAGE_TARGET := $(PRODUCT_OUT)/dt.img
+
+ifeq ($(strip $(TARGET_CUSTOM_DTBTOOL)),)
+# dtbToolCM will search subdirectories
+possible_dtb_dirs = $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/
+else
+# Most specific paths must come first in possible_dtb_dirs
+possible_dtb_dirs = $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/dts/ $(KERNEL_OUT)/arch/$(KERNEL_ARCH)/boot/
+endif
+
+define build-dtimage-target
+    $(call pretty,"Target dt image: $@")
+    $(hide) for dir in $(possible_dtb_dirs); do \
+        if [ -d "$$dir" ]; then \
+            dtb_dir="$$dir"; \
+            break; \
+        fi; \
+    done; \
+    $(DTBTOOL) $(BOARD_DTBTOOL_ARGS) -o $@ -s $(BOARD_KERNEL_PAGESIZE) -p $(KERNEL_OUT)/scripts/dtc/ "$$dtb_dir";
+    $(hide) chmod a+r $@
+endef
+
+$(INSTALLED_DTIMAGE_TARGET): $(DTBTOOL) $(INSTALLED_KERNEL_TARGET)
+	$(build-dtimage-target)
+	@echo "Made DT image: $@"
+
+.PHONY: dtimage
+dtimage: $(INSTALLED_DTIMAGE_TARGET)
+
+endif
+endif
+
+$(INSTALLED_BOOTIMAGE_TARGET): $(MKBOOTIMG) $(INTERNAL_BOOTIMAGE_FILES) $(BOOTIMAGE_EXTRA_DEPS)
+	$(call pretty,"Target boot image: $@")
+	$(hide) $(MKBOOTIMG) $(INTERNAL_BOOTIMAGE_ARGS) $(INTERNAL_MKBOOTIMG_VERSION_ARGS) $(BOARD_MKBOOTIMG_ARGS) --output $@
+	$(hide) echo -n "SEANDROIDENFORCE" >> $@
+	$(hide) $(call assert-max-image-size,$@,$(BOARD_BOOTIMAGE_PARTITION_SIZE),raw)
+	@echo "Made boot image: $@"
+
+$(INSTALLED_RECOVERYIMAGE_TARGET): $(MKBOOTIMG) $(recovery_ramdisk) $(recovery_kernel) $(RECOVERYIMAGE_EXTRA_DEPS)
+	@echo "----- Making recovery image ------"
+	$(hide) $(MKBOOTIMG) $(INTERNAL_RECOVERYIMAGE_ARGS) $(INTERNAL_MKBOOTIMG_VERSION_ARGS) $(BOARD_MKBOOTIMG_ARGS) --output $@ --id > $(RECOVERYIMAGE_ID_FILE)
+	$(hide) echo -n "SEANDROIDENFORCE" >> $@
+	$(hide) $(call assert-max-image-size,$@,$(BOARD_RECOVERYIMAGE_PARTITION_SIZE),raw)
+	@echo "Made recovery image: $@"