#
# src/kernel/Makefile
#

TARGET = arm-crux-linux-gnueabihf

PWD = $(shell pwd)
WORK = $(PWD)/work
CROSSTOOLS = $(PWD)/../../toolchain/crosstools

KERNEL_VERSION = 4.9.6

.PHONY: all clean image modules map config

all: dtb image modules map

clean: dtb-clean image-clean modules-clean map-clean

distclean: clean dtb-distclean image-distclean modules-distclean map-distclean

$(WORK)/linux-$(KERNEL_VERSION).tar.xz:
	wget -P $(WORK) https://www.kernel.org/pub/linux/kernel/v4.x/linux-$(KERNEL_VERSION).tar.xz

$(WORK)/linux-$(KERNEL_VERSION): $(WORK)/linux-$(KERNEL_VERSION).tar.xz config-$(KERNEL_VERSION)
	tar -C $(WORK) -xvf $(WORK)/linux-$(KERNEL_VERSION).tar.xz
	sed -e 's|LINUX_COMPILE_BY=.*|LINUX_COMPILE_BY=devel|g' -e 's|`hostname`|crux-arm.nu|g' -i $(WORK)/linux-$(KERNEL_VERSION)/scripts/mkcompile_h
	cd $(WORK)/linux-$(KERNEL_VERSION) && \
		make mrproper && \
		cp -v $(PWD)/config-$(KERNEL_VERSION) .config && \
	touch $(WORK)/linux-$(KERNEL_VERSION)

$(WORK)/zImage-$(KERNEL_VERSION): $(WORK)/linux-$(KERNEL_VERSION)
	cd $(WORK)/linux-$(KERNEL_VERSION) && \
		export PATH=$(CROSSTOOLS)/bin:$$PATH && \
		export LD_LIBRARY_PATH=$(CROSSTOOLS)/lib:$$LD_LIBRARY_PATH && \
		make ARCH=arm CROSS_COMPILE=$(TARGET)- zImage
	cp -v $(WORK)/linux-$(KERNEL_VERSION)/arch/arm/boot/zImage $(WORK)/zImage-$(KERNEL_VERSION)
	touch $(WORK)/zImage-$(KERNEL_VERSION)

image: $(WORK)/zImage-$(KERNEL_VERSION)

image-clean:
	rm -vrf $(WORK)/linux-$(KERNEL_VERSION) $(WORK)/zImage-$(KERNEL_VERSION)

image-distclean: image-clean

$(WORK)/vexpress-v2p-ca9.dtb: image
	cd $(WORK)/linux-$(KERNEL_VERSION) && \
		export PATH=$(CROSSTOOLS)/bin:$$PATH && \
		export LD_LIBRARY_PATH=$(CROSSTOOLS)/lib:$$LD_LIBRARY_PATH && \
		make ARCH=arm CROSS_COMPILE=$(TARGET)- vexpress-v2p-ca9.dtb
	cp -v $(WORK)/linux-$(KERNEL_VERSION)/arch/arm/boot/dts/vexpress-v2p-ca9.dtb $(WORK)/
	touch $(WORK)/zImage-$(KERNEL_VERSION)

dtb: $(WORK)/vexpress-v2p-ca9.dtb

dtb-clean:
	rm -vrf $(WORK)/vexpress-v2p-ca9.dtb

dtb-distclean: dtb-clean

$(WORK)/modules-$(KERNEL_VERSION): $(WORK)/linux-$(KERNEL_VERSION)
	cd $(WORK)/linux-$(KERNEL_VERSION) && \
		export PATH=$(CROSSTOOLS)/bin:$$PATH && \
		export LD_LIBRARY_PATH=$(LD_LIBRARY_PATH)/lib:$$LD_LIBRARY_PATH && \
		make ARCH=arm CROSS_COMPILE=$(TARGET)- modules && \
		make ARCH=arm CROSS_COMPILE=$(TARGET)- INSTALL_MOD_PATH=$(WORK)/modules-$(KERNEL_VERSION) modules_install
	rm -f $(WORK)/modules-$(KERNEL_VERSION)/lib/modules/$(KERNEL_VERSION)/{source,build}
	touch $(WORK)/modules-$(KERNEL_VERSION)

$(WORK)/modules-$(KERNEL_VERSION).tar.xz: $(WORK)/modules-$(KERNEL_VERSION)
	cd $(WORK)/modules-$(KERNEL_VERSION) && \
		tar cvJf $(WORK)/modules-$(KERNEL_VERSION).tar.xz *
	touch $(WORK)/modules-$(KERNEL_VERSION).tar.xz

modules: $(WORK)/modules-$(KERNEL_VERSION).tar.xz

modules-clean:
	rm -vrf $(WORK)/modules-$(KERNEL_VERSION) $(WORK)/modules-$(KERNEL_VERSION).tar.xz

modules-distclean: modules-clean

$(WORK)/System.map-$(KERNEL_VERSION): $(WORK)/linux-$(KERNEL_VERSION)
	cp $(WORK)/linux-$(KERNEL_VERSION)/System.map $(WORK)/System.map-$(KERNEL_VERSION)
	touch $(WORK)/System.map-$(KERNEL_VERSION)

map: $(WORK)/System.map-$(KERNEL_VERSION)

map-clean:
	rm -vrf $(WORK)/System.map-$(KERNEL_VERSION)

map-distclean: map-clean

config: $(WORK)/linux-$(KERNEL_VERSION)
	cd $(WORK)/linux-$(KERNEL_VERSION) && \
		export PATH=$(CROSSTOOLS)/bin:$$PATH && \
		export LD_LIBRARY_PATH=$(CROSSTOOLS)/lib:$$LD_LIBRARY_PATH && \
		make ARCH=arm CROSS_COMPILE=$(TARGET)- menuconfig
	touch $(WORK)/linux-$(KERNEL_VERSION)

# End of file