#  Makefile - hhl - /usr/src/world/linux-rpi
#  Copyright 2020 Nathan Fisher <nfisher.sr@gmail.com>
distname     = linux_rpi
default_goal = installkernel
include world.mk
srcdir       = /src/linux_rpi-${linux_rpi_version}
objdir       = /obj/linux_rpi-${linux_rpi_version}
config      ?= ${wkgdir}/config-rpi4-5.4.45.config

installkernel: ${objdir}/.installed

buildkernel: ${objdir}/.built

${objdir}/.mrproper: ${srcdir}/.dirstamp ${objdir}/.dirstamp
	$(MAKE) -C ${srcdir} mrproper
	touch $@

${objdir}/.config: ${objdir}/.mrproper
	$(info === Applying default kernel config ===)
	cat ${config} > ${objdir}/.config
	KBUILD_OUTPUT=${objdir} $(MAKE) -C ${srcdir} olddefconfig

${objdir}/.built: ${objdir}/.config
	$(info === Building Linux kernel ===)
	KBUILD_OUTPUT=${objdir} $(MAKE) ${makeflags} -C ${srcdir}
	touch $@

${objdir}/.installed: ${objdir}/.built
	$(info === Installing kernel modules ===)
	KBUILD_OUTPUT=${objdir} $(MAKE) -C ${srcdir} modules_install
	$(info === Installing kernel modules ===)
	KBUILD_OUTPUT=${objdir} $(MAKE) -C ${srcdir} modules_install
	$(info === Installing kernel ===)
	install -m644 ${objdir}/arch/arm/boot/zImage /boot/vmlinuz-${linux_version}-${os_abbrev}-${os_version}
	install -m644 ${objdir}/System.map /boot/System.map-${linux_version}
	install -m644 ${objdir}/.config /boot/config-${linux_version}
	$(info === Installing kernel documentation ===)
	install -d ${docdir}/linux-${linux_rpi_version}
	cp -r ${srcdir}/Documentation/* ${docdir}/linux-${linux_rpi_version}
	touch $@

${objdir}/.dirstamp:
	install -d ${objdir}
	touch $@

${srcdir}/.dirstamp:
	$(info === Extracting ${distlocal} ===)
	tar -xJf ${distlocal} -C /src
	touch $@

.PHONY: buildkernel installkernel