#
# src/kernel/Makefile
#

TARGET = arm-crux-linux-gnueabi

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

KERNEL_VERSION = 3.1.9-raspberrypi_20120803

.PHONY: all clean image modules map config

all: image modules map

clean: image-clean modules-clean map-clean

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

$(WORK)/linux-$(KERNEL_VERSION).tar.bz2:
	wget -P $(WORK) http://crux-arm.nu/files/distfiles/raspberrypi/linux-$(KERNEL_VERSION).tar.bz2
	wget --no-check-certificate -P $(WORK) https://raw.github.com/raspberrypi/tools/master/mkimage/imagetool-uncompressed.py
	wget --no-check-certificate -P $(WORK) https://github.com/raspberrypi/tools/raw/master/mkimage/first32k.bin
	wget --no-check-certificate -P $(WORK) https://github.com/raspberrypi/tools/raw/master/mkimage/boot-uncompressed.txt
	wget --no-check-certificate -P $(WORK) https://github.com/raspberrypi/tools/raw/master/mkimage/args-uncompressed.txt

$(WORK)/linux-$(KERNEL_VERSION): $(WORK)/linux-$(KERNEL_VERSION).tar.bz2 $(PWD)/config-$(KERNEL_VERSION)
	tar -C $(WORK) -xvjf $(WORK)/linux-$(KERNEL_VERSION).tar.bz2
	sed -e 's|LINUX_COMPILE_BY=.*|LINUX_COMPILE_BY=devel|' -e 's|LINUX_COMPILE_HOST=.*|LINUX_COMPILE_HOST=crux-arm.nu|' -i $(WORK)/linux-$(KERNEL_VERSION)/scripts/mkcompile_h
	cp -v $(PWD)/config-$(KERNEL_VERSION) $(WORK)/linux-$(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)
	ln -sf zImage-$(KERNEL_VERSION) $(WORK)/zImage
	touch $(WORK)/zImage-$(KERNEL_VERSION)

$(WORK)/kernel.img: $(WORK)/zImage-$(KERNEL_VERSION)
	cd $(WORK)/ && \
		python imagetool-uncompressed.py zImage-$(KERNEL_VERSION)

image: $(WORK)/kernel.img

image-clean:
	rm -vf $(WORK)/zImage-$(KERNEL_VERSION) $(WORK)/kernel.img

image-distclean: image-clean
	rm -vrf $(WORK)/linux-$(KERNEL_VERSION) $(WORK)/linux-$(KERNEL_VERSION).tar.bz2
	rm -vf $(WORK)/imagetool-uncompressed.py $(WORK)/first32k.bin $(WORK)/boot-uncompressed.txt $(WORK)/args-uncompressed.txt

$(WORK)/modules-$(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 $(WORK) && \
		tar cvJf modules-$(KERNEL_VERSION).tar.xz modules-$(KERNEL_VERSION)
	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