# Template file for 'rpi-kernel'
#
# We track the latest Raspberry Pi LTS kernel as that is what is used in the
# official Raspbian distribution. This is currently 4.14:
#
#   https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=197689

_githash="29653ef5475124316b9284adb6cbfc97e9cae48f"
_gitshort="${_githash:0:7}"

pkgname=rpi-kernel
version=4.14.37
revision=1
wrksrc="linux-${_githash}"
maintainer="Juan RP <xtraeme@voidlinux.eu>"
homepage="http://www.kernel.org"
license="GPL-2"
short_desc="The Linux kernel for Raspberry Pi (${version%.*} series [git ${_gitshort}])"
distfiles="https://github.com/raspberrypi/linux/archive/${_githash}.tar.gz"
checksum=20e596c9bfaa739bf9178431c9fa332429b63671368826361b1a46ccf3354236

_kernver="${version}_${revision}"

nodebug=yes
nostrip=yes
noverifyrdeps=yes
noshlibprovides=yes

# RPi, RPi2, RPi3
only_for_archs="armv6l armv6l-musl armv7l armv7l-musl aarch64 aarch64-musl"
hostmakedepends="perl kmod uboot-mkimage libressl bc"
makedepends="ncurses-devel"
triggers="kernel-hooks"
# These files could be modified when an external module is built.
mutable_files="
	/usr/lib/modules/${_kernver}/modules.dep
	/usr/lib/modules/${_kernver}/modules.dep.bin
	/usr/lib/modules/${_kernver}/modules.symbols
	/usr/lib/modules/${_kernver}/modules.symbols.bin
	/usr/lib/modules/${_kernver}/modules.alias
	/usr/lib/modules/${_kernver}/modules.alias.bin
	/usr/lib/modules/${_kernver}/modules.devname"

pre_configure() {
	# Remove .git directory, otherwise scripts/setkernelversion.sh
	# modifies KERNELRELEASE and appends + to it.
	rm -rf .git
}
do_configure() {
	if [ "$CROSS_BUILD" ]; then
		_args="CROSS_COMPILE=${XBPS_CROSS_TRIPLET}-"
	fi

	# Use upstream default configuration, no need to maintain ours.
	case "$XBPS_TARGET_MACHINE" in
	aarch64*)
		echo "CONFIG_CONNECTOR=y" >> arch/arm64/configs/bcmrpi3_defconfig
		echo "CONFIG_PROC_EVENTS=y" >> arch/arm64/configs/bcmrpi3_defconfig
		echo "CONFIG_F2FS_FS_SECURITY=y" >> arch/arm64/configs/bcmrpi3_defconfig
		echo "CONFIG_CGROUP_PIDS=y" >> arch/arm64/configs/bcmrpi3_defconfig
		make ${makejobs} ${_args} ARCH=arm64 bcmrpi3_defconfig
		;;
	armv7l*)
		echo "CONFIG_USER_NS=y" >> arch/arm/configs/bcm2709_defconfig
		echo "CONFIG_CONNECTOR=y" >> arch/arm/configs/bcm2709_defconfig
		echo "CONFIG_PROC_EVENTS=y" >> arch/arm/configs/bcm2709_defconfig
		echo "CONFIG_F2FS_FS_SECURITY=y" >> arch/arm/configs/bcm2709_defconfig
		echo "CONFIG_CGROUP_PIDS=y" >> arch/arm/configs/bcm2709_defconfig
		make ${makejobs} ${_args} ARCH=arm bcm2709_defconfig
		;;
	armv6l*)
		echo "CONFIG_USER_NS=y" >> arch/arm/configs/bcmrpi_defconfig
		echo "CONFIG_CONNECTOR=y" >> arch/arm/configs/bcmrpi_defconfig
		echo "CONFIG_PROC_EVENTS=y" >> arch/arm/configs/bcmrpi_defconfig
		echo "CONFIG_F2FS_FS_SECURITY=y" >> arch/arm/configs/bcmrpi_defconfig
		echo "CONFIG_CGROUP_PIDS=y" >> arch/arm/configs/bcmrpi_defconfig
		make ${makejobs} ${_args} ARCH=arm bcmrpi_defconfig
		;;
	esac

	# Always use our revision to CONFIG_LOCALVERSION to match our pkg version.
	sed -i -e "s|^\(CONFIG_LOCALVERSION=\).*|\1\"_${revision}\"|" .config
}
do_build() {
	if [ "$CROSS_BUILD" ]; then
		_args="CROSS_COMPILE=${XBPS_CROSS_TRIPLET}-"
	fi

	case "$XBPS_TARGET_MACHINE" in
	arm*)
		_arch=arm
		_targets="zImage modules dtbs"
		;;
	aarch64*)
		unset LDFLAGS
		_arch=arm64
		_targets="Image modules dtbs"
		;;
	esac

	make ${makejobs} ${_args} ARCH=${_arch} prepare
	make ${makejobs} ${_args} ARCH=${_arch} ${_targets}
}
do_install() {
	case "$XBPS_TARGET_MACHINE" in
	arm*)
		_arch="arm"
	;;
	aarch64*)
		_arch="arm64"
	;;
	esac

	local hdrdest

	# Run depmod after compressing modules.
	sed -i '2iexit 0' scripts/depmod.sh

	# Install kernel, firmware and modules
	make ${makejobs} ARCH=${_arch} INSTALL_MOD_PATH=${DESTDIR} modules_install

	# Install device tree blobs
	make ${makejobs} ARCH=${_arch} INSTALL_DTBS_PATH=${DESTDIR}/boot dtbs_install

	#move rpi3's dtb that ended up in /boot/broadcom
	case "$XBPS_TARGET_MACHINE" in
	aarch64*)
		mv ${DESTDIR}/boot/broadcom/bcm2710-rpi-3-b.dtb ${DESTDIR}/boot
		;;
	esac

	vmkdir boot
	# Generate kernel.img and install it to destdir.
	case "$XBPS_TARGET_MACHINE" in
	aarch64*)
		cp arch/arm64/boot/Image ${DESTDIR}/boot/kernel8.img
		;;
	armv7l*)
		cp arch/arm/boot/zImage ${DESTDIR}/boot/kernel7.img
		;;
	armv6l*)
		cp arch/arm/boot/zImage ${DESTDIR}/boot/kernel.img
		;;
	esac

	hdrdest=${DESTDIR}/usr/src/${sourcepkg}-headers-${_kernver}

	# Switch to /usr.
	vmkdir usr
	mv ${DESTDIR}/lib ${DESTDIR}/usr

	cd ${DESTDIR}/usr/lib/modules/${_kernver}
	rm -f source build
	ln -sf ../../../src/${sourcepkg}-headers-${_kernver} build

	cd ${wrksrc}
	# Install required headers to build external modules
	install -Dm644 Makefile ${hdrdest}/Makefile
	install -Dm644 kernel/Makefile ${hdrdest}/kernel/Makefile
	install -Dm644 .config ${hdrdest}/.config
	mkdir -p ${hdrdest}/include

	# Remove firmware stuff provided by the "linux-firmware" pkg.
	rm -rf ${DESTDIR}/usr/lib/firmware

	for i in acpi asm-generic config crypto drm generated linux math-emu \
		media net pcmcia scsi sound trace uapi video xen; do
		[ -d include/$i ] && cp -a include/$i ${hdrdest}/include
	done

	cd ${wrksrc}
	# Copy files necessary for later builds.
	cp Module.symvers ${hdrdest}
	cp -a scripts ${hdrdest}

	# fix permissions on scripts dir
	chmod og-w -R ${hdrdest}/scripts

	# copy arch includes for external modules
	mkdir -p ${hdrdest}/arch/${_arch}
	cp -a arch/${_arch}/include ${hdrdest}/arch/${_arch}

	mkdir -p ${hdrdest}/arch/${arch}/kernel
	cp arch/${_arch}/Makefile ${hdrdest}/arch/${_arch}
	cp arch/${_arch}/kernel/asm-offsets.s ${hdrdest}/arch/${_arch}/kernel

	# Add md headers
	mkdir -p ${hdrdest}/drivers/md
	cp drivers/md/*.h ${hdrdest}/drivers/md

	# Add inotify.h
	mkdir -p ${hdrdest}/include/linux
	cp include/linux/inotify.h ${hdrdest}/include/linux

	# Add wireless headers
	mkdir -p ${hdrdest}/net/mac80211/
	cp net/mac80211/*.h ${hdrdest}/net/mac80211

	# add dvb headers for external modules
	mkdir -p ${hdrdest}/include/config/dvb/
	cp include/config/dvb/*.h ${hdrdest}/include/config/dvb/

	# Copy in Kconfig files
	for i in $(find . -name "Kconfig*"); do
		mkdir -p ${hdrdest}/$(echo $i | sed 's|/Kconfig.*||')
		cp $i ${hdrdest}/$i
	done

	# Remove unneeded architectures
	for arch in alpha arc avr32 blackfin c6x cris frv h8300 \
		hexagon ia64 m* n* p* s* um v850 x86 xtensa; do
		rm -rf ${hdrdest}/arch/${arch}
	done

	# Compress all modules with xz to save a few MBs.
	msg_normal "$pkgver: compressing kernel modules with gzip, please wait...\n"
	find ${DESTDIR} -name '*.ko' | xargs -n1 -P0 gzip -9

	# ... and run depmod again.
	depmod -b ${DESTDIR}/usr -F System.map ${_kernver}
}

rpi-kernel-headers_package() {
	nostrip=yes
	noverifyrdeps=yes
	noshlibprovides=yes
	short_desc="The Linux kernel headers for Raspberry Pi (${version%.*} series [git ${_gitshort}])"
	pkg_install() {
		vmove usr/src
		vmove usr/lib/modules/${_kernver}/build
	}
}