# Template file for 'rpi-kernel'
#
# We track the latest Raspberry Pi LTS kernel as that is what is used in the
# official Raspberry Pi OS distribution. This is currently 6.1:
#
# https://forums.raspberrypi.com/viewtopic.php?t=344246
#
# Commit hash is picked from latest tag [1], if appropriate, or from latest
# "Merge remote-tracking branch 'stable/linux-6.x.y' into rpi-6.x.y" commit.
#
# [1] https://github.com/raspberrypi/linux/tags
#
# Upstream documentation: https://www.raspberrypi.com/documentation/computers/linux_kernel.html
pkgname=rpi-kernel
version=6.1.54
revision=1
_githash=fad58933544bb2a7b7db92847c25c79a83171fa6
archs="armv6l* armv7l* aarch64*"
hostmakedepends="perl kmod uboot-mkimage openssl-devel bc bison flex xz"
makedepends="ncurses-devel"
short_desc="Linux kernel for Raspberry Pi (${version%.*} series)"
maintainer="Piraty <mail@piraty.dev>"
license="GPL-2.0-only"
homepage="http://www.kernel.org"
distfiles="https://github.com/raspberrypi/linux/archive/${_githash}.tar.gz"
checksum=1bd02902fae49351fb16ac0d5ccc3bf4d67aa0640006dbbf8846963519b01ab8
python_version=3

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

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

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"

case "$XBPS_TARGET_MACHINE" in
	armv6l*) _arch=arm; _image_target=zImage; _image_name=kernel.img ;;
	armv7l*) _arch=arm; _image_target=zImage; _image_name=kernel7.img ;;
	aarch64*) _arch=arm64; _image_target=Image.gz; _image_name=kernel8.img ;;
	*) broken="No Raspberry Pi exists for this arch" ;;
esac

if [ "$CROSS_BUILD" ]; then
	_cross="CROSS_COMPILE=${XBPS_CROSS_TRIPLET}-"
else
	_cross=
fi

do_configure() {
	local target defconfig

	case "$XBPS_TARGET_MACHINE" in
		# for zero, 1
		armv6l*) target=bcmrpi_defconfig ;;
		# for 2
		armv7l*) target=bcm2709_defconfig ;;
		# for 3, 4, zero 2
		aarch64*) target=bcm2711_defconfig ;;
	esac

	defconfig="arch/${_arch}/configs/${target}"
	cp "$defconfig" .config

	cat <<-! > "foo"
	CONFIG_CONNECTOR=y
	CONFIG_HID_STEAM=y
	CONFIG_PROC_EVENTS=y
	CONFIG_GCC_PLUGINS=n
	CONFIG_BRIDGE_VLAN_FILTERING=y
	CONFIG_FUNCTION_TRACER=n
	CONFIG_STACK_TRACER=n
	CONFIG_ATM=n
	CONFIG_SLAB_FREELIST_RANDOM=y
	CONFIG_CGROUP_PIDS=y
	CONFIG_SLAB_FREELIST_HARDENED=y
	CONFIG_PACKET=m
	CONFIG_NF_CT_PROTO_DCCP=y
	CONFIG_NF_CT_PROTO_SCTP=y
	CONFIG_NF_CT_PROTO_UDPLITE=y
	CONFIG_BATMAN_ADV=n
	CONFIG_INPUT_LEDS=m
	CONFIG_SQUASHFS_LZ4=y
	CONFIG_STRICT_DEVMEM=y
	CONFIG_IO_STRICT_DEVMEM=y
	CONFIG_ENCRYPTED_KEYS=m
	CONFIG_KEY_DH_OPERATIONS=y
	CONFIG_HARDENED_USERCOPY=y
	CONFIG_LOCALVERSION="_${revision}"
	CONFIG_IP_PNP=n
	CONFIG_USB_DWC2=m
	CONFIG_USB_ETH=m
	CONFIG_RTC_HCTOSYS=y
	CONFIG_RTC_HCTOSYS_DEVICE="rtc0"
	CONFIG_RTC_DRV_DS1307=y
	CONFIG_I2C_BCM2835=y
	CONFIG_MEMCG=y
	CONFIG_CGROUP_PIDS=y
	CONFIG_CGROUP_DEVICE=y
	CONFIG_CPU_FREQ_DEFAULT_GOV_SCHEDUTIL=y
	CONFIG_PSI=y
	CONFIG_ZSTD_COMPRESS=y
	CONFIG_LZ4_COMPRESS=y
	CONFIG_CRYPTO_RNG=y
	CONFIG_CRYPTO_RNG_DEFAULT=y
	!

	while read -r line; do
		# skip comments
		case "$line" in
			"#"*) continue;;
		esac
		local option=${line%%=*} str=
		local cmd="$(echo "$line" | cut -d= -f2)"
		case "$cmd" in
			y) cmd="enable";;
			n) cmd="disable";;
			m) cmd="module";;
			'"'*) cmd="set-str"; str="${line#*=}";;
			[0-9]*) cmd="set-val"; str="${line#*=}";;
			'') continue ;;
			*) msg_error "Command $cmd not accepted\n" ;;
		esac
		msg_normal "config: $cmd: $option $str\n"
		./scripts/config \
			--file .config \
			"--$cmd" "$option" "${str//\"/}"
	done < foo

	make "${makejobs}" "${_cross}" ARCH="${_arch}" olddefconfig
}

do_build() {
	make "${makejobs}" "${_cross}" ARCH="${_arch}" prepare
	make "${makejobs}" "${_cross}" ARCH="${_arch}" "${_image_target}" modules dtbs
}

do_install() {
	local hdrdest="${DESTDIR}/usr/src/${sourcepkg}-headers-${_kernver}"

	# Run depmod after compressing modules.
	vsed -i -e '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 dtbs that ended up in /boot/broadcom
	if [ -d "${DESTDIR}/boot/broadcom" ]; then
		mv "${DESTDIR}"/boot/broadcom/*dtb "${DESTDIR}/boot"
	fi

	# Install kernel image
	vinstall "arch/${_arch}/boot/${_image_target}" 644 boot "${_image_name}"

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

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

	# Install required headers to build external modules
	install -Dm644 Makefile "${hdrdest}/Makefile"
	install -Dm644 Kbuild "${hdrdest}/Kbuild"
	install -Dm644 kernel/Makefile "${hdrdest}/kernel/Makefile"
	install -Dm644 .config "${hdrdest}/.config"
	while read -r file; do
		mkdir -p "${hdrdest}/$(dirname "$file")"
		install -Dm644 "$file" "${hdrdest}/${file}"
	done < <(find . -name 'Kconfig*')
	while read -r file; do
		mkdir -p "${hdrdest}/$(dirname $file)"
		install -Dm644 "$file" "${hdrdest}/${file}"
	done < <(find "arch/${_arch}" scripts -name module.lds -o -name Kbuild.platforms -o -name Platform)
	mkdir -p "${hdrdest}/include"

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

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

	# Remove helper binaries built for host,
	# if generated files from the scripts/ directory need to be included,
	# they need to be copied to ${hdrdest} before this step
	if [ "$CROSS_BUILD" ]; then
		make "${makejobs}" ARCH="${_arch}" _mrproper_scripts
		# remove host specific objects as well
		find scripts -name '*.o' -delete
	fi

	# Copy files necessary for later builds.
	cp Module.symvers "${hdrdest}"
	cp -a scripts "${hdrdest}"
	mkdir -p "${hdrdest}/security/selinux"
	cp -a security/selinux/include "${hdrdest}/security/selinux"
	mkdir -p "${hdrdest}/tools/include"
	cp -a tools/include/tools "${hdrdest}/tools/include"
	if [ -d "arch/${_arch}/tools" ]; then
		cp -a "arch/${_arch}/tools" "${hdrdest}/arch/${_arch}"
	fi
	cp -a kernel/time/timeconst.bc "${hdrdest}/kernel/time"
	cp -a kernel/bounds.c "${hdrdest}/kernel"
	mkdir -p "${hdrdest}/arch/x86/entry/syscalls"
	cp -a arch/x86/entry/syscalls/syscall_32.tbl "${hdrdest}/arch/x86/entry/syscalls"

	# 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"
	if [ "$_arch" = "arm64" ] ; then
		cp -a "arch/${_arch}/kernel/vdso" "${hdrdest}/arch/${_arch}/kernel/"
	fi

	# 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"

	# 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}"
}

subpackages="rpi-kernel-headers"

case "$XBPS_TARGET_MACHINE" in
	armv7l*) subpackages+=" rpi2-kernel rpi2-kernel-headers" ;;
	aarch64*) subpackages+=" rpi3-kernel rpi3-kernel-headers rpi4-kernel rpi4-kernel-headers" ;;
esac

rpi-kernel-headers_package() {
	nostrip=yes
	noverifyrdeps=yes
	noshlibprovides=yes
	short_desc="${short_desc/kernel/kernel headers}"
	pkg_install() {
		vmove usr/src
		vmove usr/lib/modules/${_kernver}/build
	}
}

# hard-code the minimum version to prevent possible issues with partial upgrades
# of legacy (split) systems
rpi2-kernel_package() {
	build_style=meta
	short_desc+=" (transitional dummy package)"
	depends="rpi-kernel>=5.15.68_1"
}

rpi2-kernel-headers_package() {
	build_style=meta
	short_desc="${short_desc/kernel/kernel headers} (transitional dummy package)"
	depends="rpi-kernel-headers>=5.15.68_1"
}

rpi3-kernel_package() {
	build_style=meta
	short_desc+=" (transitional dummy package)"
	depends="rpi-kernel>=5.15.68_1"
}

rpi3-kernel-headers_package() {
	build_style=meta
	short_desc="${short_desc/kernel/kernel headers} (transitional dummy package)"
	depends="rpi-kernel-headers>=5.15.68_1"
}

rpi4-kernel_package() {
	build_style=meta
	short_desc+=" (transitional dummy package)"
	depends="rpi-kernel>=5.15.68_1"
}

rpi4-kernel-headers_package() {
	build_style=meta
	short_desc="${short_desc/kernel/kernel headers} (transitional dummy package)"
	depends="rpi-kernel-headers>=5.15.68_1"
}