#!/usr/bin/make -f
# -*- makefile -*-

# Uncomment this to turn on verbose mode.
export DH_VERBOSE = 1

VERSION := 4.19.125-mtk

ARCH := arm64
CROSS_COMPILE := aarch64-linux-gnu-

KERNEL_OPTIONS := \
	ARCH=${ARCH} \
	CROSS_COMPILE=${CROSS_COMPILE} \
	LOCALVERSION=-mtk

LDFLAGS :=
BUILD_DIR := $(CURDIR)/debian/build
DESTDIR := $(CURDIR)/debian/linux-image-$(VERSION)
DESTDIR_HEADERS := $(CURDIR)/debian/linux-headers-$(VERSION)
DESTDIR_KBUILD := $(CURDIR)/debian/linux-kbuild-$(VERSION)

%:
	dh $@

override_dh_auto_clean:
	true

override_dh_auto_build:
	cp debian/defconfig .config
	+make $(KERNEL_OPTIONS) olddefconfig
	+make $(KERNEL_OPTIONS) -j$(shell nproc) Image.gz modules dtbs

	/usr/bin/mkimage -D "-I dts -O dtb -p 1024" -f debian/kernel-fit-image.its boot.img

override_dh_auto_install:
	+make $(KERNEL_OPTIONS) INSTALL_MOD_PATH=$(DESTDIR) modules_install
	rm $(DESTDIR)/lib/modules/$(VERSION)/build
	rm $(DESTDIR)/lib/modules/$(VERSION)/source

	install -d $(DESTDIR)/boot
	cp arch/$(ARCH)/boot/Image $(DESTDIR)/boot/vmlinuz-$(VERSION)
	cp System.map $(DESTDIR)/boot/System.map-$(VERSION)
	cp .config $(DESTDIR)/boot/config-$(VERSION)
	install -p -m 755 boot.img $(DESTDIR)/boot
	cp arch/arm64/boot/dts/mediatek/mt8167-coral.dtb ${DESTDIR}/boot
	cp arch/arm64/boot/dts/mediatek/mt8167-coral-evt1-overlay.dtb ${DESTDIR}/boot/coral-evt1.dtbo
	cp arch/arm64/boot/dts/mediatek/mt8167-coral-display-overlay.dtb ${DESTDIR}/boot/coral-display.dtbo
	cp arch/arm64/boot/dts/mediatek/mt8167-coral-otg-overlay.dtb ${DESTDIR}/boot/coral-otg.dtbo

	install -d $(DESTDIR_HEADERS)/usr/src/linux-headers-$(VERSION)
	install -d $(DESTDIR_HEADERS)/usr/src/linux-headers-$(VERSION)/arch/arm
	install -d $(DESTDIR_HEADERS)/usr/src/linux-headers-$(VERSION)/arch/$(ARCH)/kernel

	cp -a .config $(DESTDIR_HEADERS)/usr/src/linux-headers-$(VERSION)
	cp -a Module.symvers $(DESTDIR_HEADERS)/usr/src/linux-headers-$(VERSION)
	cp -a include $(DESTDIR_HEADERS)/usr/src/linux-headers-$(VERSION)
	cp -a arch/$(ARCH)/include $(DESTDIR_HEADERS)/usr/src/linux-headers-$(VERSION)/arch/$(ARCH)
	cp -a arch/arm/include $(DESTDIR_HEADERS)/usr/src/linux-headers-$(VERSION)/arch/arm
	cp -a Makefile $(DESTDIR_HEADERS)/usr/src/linux-headers-$(VERSION)

	( \
		find arch/$(ARCH) -maxdepth 1 -name 'Makefile*' -print; \
		find arch/$(ARCH) \( -name 'module.lds' -o -name 'Kbuild.platforms' -o -name 'Platform' \) -print; \
		find $$(find arch/$(ARCH) \( -name include -o -name scripts \) -type d -print) -print; \
	) | cpio -pdm $(DESTDIR_HEADERS)/usr/src/linux-headers-$(VERSION)


	# Clean up any leftover x86 artifacts from the kernel build, and then build scripts
	find $(CURDIR)/scripts -type f | xargs file | grep 'x86-' | awk '{print $$1}' | tr -d ':' | xargs rm -f
	mkdir -p $(BUILD_DIR)/build-tools/scripts
	$(MAKE) $(KERNEL_OPTIONS) \
		CROSS_COMPILE=$(DEB_HOST_GNU_TYPE)- \
		-C $(BUILD_DIR)/build-tools/scripts -f $(CURDIR)/debian/rules.d/scripts/Makefile \
		top_rulesdir=$(CURDIR)/debian/rules.d \
		top_srcdir=$(CURDIR) \
		OUTDIR=scripts \
			install \
		DESTDIR=$(DESTDIR_KBUILD) \
		prefix=/usr/lib/linux-kbuild-$(VERSION)

	install -d $(DESTDIR_HEADERS)/lib/modules/$(VERSION)
	ln -s /usr/src/linux-headers-$(VERSION) $(DESTDIR_HEADERS)/lib/modules/$(VERSION)/build
	ln -s /usr/lib/linux-kbuild-$(VERSION)/scripts $(DESTDIR_HEADERS)/usr/src/linux-headers-$(VERSION)/scripts

override_dh_installudev:
	dh_installudev --name=pvr --priority 99