boot.mk

#
# Copyright (C) 2020 The Android Open-Source 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.
#

# can this be done in bash? credits go to bgcngm
define make_header
  perl -e 'print pack("a4 L a32 a472", "\x88\x16\x88\x58", $$ARGV[0], $$ARGV[1], "\xFF"x472)' $(1) $(2) > $(3)
endef

# this is overriding targets from build/core/Makefile
$(INSTALLED_KERNEL_TARGET).mtk.header: $(INSTALLED_KERNEL_TARGET)
	size=$$($(call get-file-size,$(INSTALLED_KERNEL_TARGET))); \
		$(call make_header, $$((size)), "KERNEL", $@)
$(INSTALLED_KERNEL_TARGET).mtk: $(INSTALLED_KERNEL_TARGET).mtk.header
	$(call pretty,"Adding MTK header to kernel.")
	cat $(INSTALLED_KERNEL_TARGET) > $@
	
INSTALLED_RAMDISK_TARGET := $(BUILT_RAMDISK_TARGET)
$(INSTALLED_RAMDISK_TARGET): $(MKBOOTFS) $(INTERNAL_RAMDISK_FILES) | $(MINIGZIP)
	$(call pretty,"Target ram disk: $@")
	$(hide) $(MKBOOTFS) $(TARGET_ROOT_OUT) | $(MINIGZIP) > $@

$(INSTALLED_RAMDISK_TARGET).mtk.header: $(INSTALLED_RAMDISK_TARGET)
	size=$$($(call get-file-size,$(INSTALLED_RAMDISK_TARGET))); \
		$(call make_header, $$((size)), "ROOTFS", $@)
$(INSTALLED_RAMDISK_TARGET).mtk: $(INSTALLED_RAMDISK_TARGET).mtk.header
	$(call pretty,"Adding MTK header to ramdisk.")
	cat $(INSTALLED_RAMDISK_TARGET).mtk.header $(INSTALLED_RAMDISK_TARGET) \
		> $@

$(PRODUCT_OUT)/recovery_kernel.mtk.header: $(recovery_kernel)
	size=$$($(call get-file-size,$(recovery_kernel))); \
		$(call make_header, $$((size)), "KERNEL", $@)
$(PRODUCT_OUT)/recovery_kernel.mtk: $(PRODUCT_OUT)/recovery_kernel.mtk.header
	$(call pretty,"Adding MTK header to recovery kernel.")
	cat $(recovery_kernel) > $@

$(recovery_ramdisk).mtk.header: $(recovery_ramdisk)
	size=$$($(call get-file-size,$(recovery_ramdisk))); \
		$(call make_header, $$((size)), "RECOVERY", $@)
$(recovery_ramdisk).mtk:  $(MKBOOTIMG) $(recovery_ramdisk).mtk.header
	$(call pretty,"Adding MTK header to recovery ramdisk.")
	cat $(recovery_ramdisk).mtk.header $(recovery_ramdisk) > $@

INTERNAL_MTK_BOOTIMAGE_ARGS := \
		--kernel $(INSTALLED_KERNEL_TARGET).mtk \
		--ramdisk $(INSTALLED_RAMDISK_TARGET).mtk

$(INSTALLED_BOOTIMAGE_TARGET): $(MKBOOTIMG)\
		$(INSTALLED_RAMDISK_TARGET).mtk $(INSTALLED_KERNEL_TARGET).mtk
	$(call pretty,"Target boot image: $@")
	$(MKBOOTIMG) $(INTERNAL_MTK_BOOTIMAGE_ARGS) $(BOARD_MKBOOTIMG_ARGS) \
		--output $@
	$(hide) $(call assert-max-image-size,$@, \
		$(BOARD_BOOTIMAGE_PARTITION_SIZE),raw)
	@echo -e ${CL_CYN}"Made boot image: $@"${CL_RST}

INTERNAL_MTK_RECOVERYIMAGE_ARGS := \
		--kernel $(PRODUCT_OUT)/recovery_kernel.mtk \
		--ramdisk $(recovery_ramdisk).mtk

$(INSTALLED_RECOVERYIMAGE_TARGET): $(MKBOOTIMG) \
		$(recovery_ramdisk).mtk $(PRODUCT_OUT)/recovery_kernel.mtk
	@echo -e ${CL_CYN}"----- Making recovery image ------"${CL_RST}
	$(MKBOOTIMG) $(INTERNAL_MTK_RECOVERYIMAGE_ARGS) \
		$(BOARD_MKBOOTIMG_ARGS) --output $@
	$(hide) $(call assert-max-image-size,$@, \
		$(BOARD_RECOVERYIMAGE_PARTITION_SIZE),raw)
	@echo -e ${CL_CYN}"Made recovery image: $@"${CL_RST}