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# Maintainer: Natanael Copa <ncopa@alpinelinux.org>

pkgname=linux-rpi
pkgver=4.4.11
case $pkgver in
*.*.*)	_kernver=${pkgver%.*};;
*.*)	_kernver=${pkgver};;
esac
pkgrel=0
pkgdesc="Linux kernel with Raspberry Pi patches"
url=https://github.com/raspberrypi/linux
depends="mkinitfs linux-firmware"
makedepends="perl installkernel bash gmp-dev bc"
options="!strip"
install=
source="http://ftp.kernel.org/pub/linux/kernel/v4.x/linux-$_kernver.tar.xz
	http://ftp.kernel.org/pub/linux/kernel/v4.x/patch-$pkgver.xz
	http://dev.alpinelinux.org/~tteras/rpi/linux-4.4.y-rpi-20160514.patch
	rpi-cirrus-4.4.y-20160514.patch
	gpio-mcp23s08-pullups.patch
	rotary-encoder-fix.patch
	issue-4973.patch

	config-rpi.armhf
	config-rpi2.armhf
	markdt
	"
subpackages=""
_flavors=
for _i in $source; do
	case $_i in
	config-*.$CARCH)
		_f=${_i%.$CARCH}
		_f=${_f#config-}
		_flavors="$_flavors ${_f}"
		[ "linux-$_f" != "$pkgname" ] && subpackages="$subpackages linux-${_f}"
		subpackages="$subpackages linux-${_f}-dev:_${_f}_dev"
		;;
	esac
done

arch="armhf"
license="GPL2"

prepare() {
	local _patch_failed=
	cd "$srcdir"/linux-$_kernver
	if [ "${pkgver%.0}" = "$pkgver" ]; then
		msg "Applying patch-$pkgver.xz"
		unxz -c < "$srcdir"/patch-$pkgver.xz | patch -p1 -N || return 1
	fi

	# first apply patches in specified order
	for i in $source; do
		case $i in
		*.patch)
			msg "Applying $i..."
			if ! patch -s -p1 -N -i "$srcdir"/${i##*/}; then
				echo $i >>failed
				_patch_failed=1
			fi
			;;
		esac
	done

	if ! [ -z "$_patch_failed" ]; then
		error "The following patches failed:"
		cat failed
		return 1
	fi

	# remove localversion from patch if any
	rm -f localversion*

	for i in $_flavors; do
		local _config=config-$i.${CARCH}
		local _builddir="$srcdir"/build-$i
		mkdir -p "$_builddir"
		echo "-$pkgrel-$i" > "$srcdir"/build-$i/localversion-alpine \
			|| return 1

		cp "$srcdir"/$_config "$_builddir"/.config || return 1
		make -C "$srcdir"/linux-$_kernver \
			O="$_builddir" \
			HOSTCC="${CC:-gcc}" \
			silentoldconfig || return 1
	done
}

build() {
	export GCC_SPECS=hardenednopie.specs
	for i in $_flavors; do
		cd "$srcdir"/build-$i
		make CC="${CC:-gcc}" \
			KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-Alpine" \
			|| return 1
	done
}

_package() {
	local _buildflavor="$1" _outdir="$2"
	local _abi_release=${pkgver}-${pkgrel}-${_buildflavor}

	cd "$srcdir"/build-$_buildflavor || return 1

	mkdir -p "$_outdir"/boot "$_outdir"/lib/modules

	local _install
	case "$CARCH" in
	arm*)
		local _dtbdir="$_outdir"/usr/lib/linux-${_abi_release}
		cd "$srcdir"/build-$_buildflavor/arch/arm/boot/dts || return 1
		mkdir -p "$_dtbdir"
		find . -name "*.dtb" -type f | cpio -pdm "$_dtbdir"
		_install=zinstall
		;;
	*)
		_install=install
		;;
	esac

	cd "$srcdir"/build-$_buildflavor || return 1
	make -j1 modules_install firmware_install $_install \
		INSTALL_MOD_PATH="$_outdir" \
		INSTALL_PATH="$_outdir"/boot \
		|| return 1

	# tell rpi bootloader we are device tree capable
	"$srcdir"/markdt "$_outdir"/boot/vmlinuz-$_buildflavor \
		|| return 1

	rm -f "$_outdir"/lib/modules/${_abi_release}/build \
		"$_outdir"/lib/modules/${_abi_release}/source
	rm -rf "$_outdir"/lib/firmware

	install -D include/config/kernel.release \
		"$_outdir"/usr/share/kernel/$_buildflavor/kernel.release
}

# main flavor installs in $pkgdir
package() {
	_package rpi "$pkgdir"
}

_dev() {
	local _abi_release=${pkgver}-${pkgrel}-$1
	# copy the only the parts that we really need for build 3rd party
	# kernel modules and install those as /usr/src/linux-headers,
	# simlar to what ubuntu does
	#
	# this way you dont need to install the 300-400 kernel sources to
	# build a tiny kernel module
	#
	pkgdesc="Headers and script for third party modules for $1 grsec kernel"
	depends="gmp-dev bash"
	local dir="$subpkgdir"/usr/src/linux-headers-${_abi_release}

	# first we import config, run prepare to set up for building
	# external modules, and create the scripts
	mkdir -p "$dir"
	cp "$srcdir"/config-$1.${CARCH} "$dir"/.config
	make -j1 -C "$srcdir"/linux-$_kernver O="$dir" HOSTCC="${CC:-gcc}" \
		silentoldconfig prepare modules_prepare scripts

	# remove the stuff that poits to real sources. we want 3rd party
	# modules to believe this is the soruces
	rm "$dir"/Makefile "$dir"/source

	# copy the needed stuff from real sources
	#
	# this is taken from ubuntu kernel build script
	# http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-jaunty.git;a=blob;f=debian/rules.d/3-binary-indep.mk;hb=HEAD
	cd "$srcdir"/linux-$_kernver
	find . -path './include/*' -prune -o -path './scripts/*' -prune \
		-o -type f \( -name 'Makefile*' -o -name 'Kconfig*' \
		-o -name 'Kbuild*' -o -name '*.sh' -o -name '*.pl' \
		-o -name '*.lds' \) | cpio -pdm "$dir"
	cp -a drivers/media/dvb/dvb-core/*.h "$dir"/drivers/media/dvb/dvb-core
	cp -a drivers/media/video/*.h "$dir"/drivers/media/video
	cp -a drivers/media/dvb/frontends/*.h "$dir"/drivers/media/dvb/frontends
	cp -a scripts include "$dir"
	find $(find arch -name include -type d -print) -type f \
		| cpio -pdm "$dir"

	install -Dm644 "$srcdir"/build-$1/Module.symvers \
		"$dir"/Module.symvers

	mkdir -p "$subpkgdir"/lib/modules/${_abi_release}
	ln -sf /usr/src/linux-headers-${_abi_release} \
		"$subpkgdir"/lib/modules/${_abi_release}/build
}

for _f in $_flavors; do
	[ "linux-$_f" != "$pkgname" ] && eval "${_f}() { _package "$_f" "$subpkgdir"; }"
	eval "_${_f}_dev() { _dev $_f; }"
done

md5sums="9a78fa2eb6c68ca5a40ed5af08142599  linux-4.4.tar.xz
5c1d328f03aaafb9cf7fdc442468c348  patch-4.4.11.xz
1d08efb60aaa1a161aaa128807fcd8ce  linux-4.4.y-rpi-20160514.patch
1ac525e064919fd4ffec5d40b910cae1  rpi-cirrus-4.4.y-20160514.patch
b66e8aa4991ca5c2ccd61559ed7e6491  gpio-mcp23s08-pullups.patch
5508d2b3e5967bd57f92f551d90b3e54  rotary-encoder-fix.patch
29281b74d2cef6965fa4ab6d826a2aa4  issue-4973.patch
488b5bf00d6d9dfc0be1a29f9ca9c37e  config-rpi.armhf
9c4a9d298f57b6fecabb8e2f2409561d  config-rpi2.armhf
e587cae1dca2f5992555d9bcf53deecf  markdt"
sha256sums="401d7c8fef594999a460d10c72c5a94e9c2e1022f16795ec51746b0d165418b2  linux-4.4.tar.xz
394c3970865c092f21cd02b8f433024adbf8539114567d6bde197fed6612f553  patch-4.4.11.xz
68b19c4c589afa869d6278d775a34bb30bc83b3e09c703d9df3163f144a9d36e  linux-4.4.y-rpi-20160514.patch
651845267ee7ee815cc5e78cad9dad87d3de388ce07f911f68b20880ca1e3292  rpi-cirrus-4.4.y-20160514.patch
b389a556bbd98053881b43deef1adf20640f980557c5f37cfd7ece2daeecbda9  gpio-mcp23s08-pullups.patch
ab6740577fe8c1d71d2c716720ebbbf9a750985963d6938093b4ca9194b6e871  rotary-encoder-fix.patch
3a16e927ce53a8c56e7f1dd86fe8ad08b1c06466f5206c521a7e2de1e4796d6c  issue-4973.patch
cd0ac8a7d50fcf22594d26e06b8aa48a88b899f6bbaea69931cded65bb64dc71  config-rpi.armhf
5f4c13e51209cf22081f13afe22489865e7d6e85bb5779f230514524f3a9dd5c  config-rpi2.armhf
0f6681fc5c3590e1dbe13a2bde796403bd1529cf0fe19720899eaa0db79bcb49  markdt"
sha512sums="13c8459933a8b80608e226a1398e3d1848352ace84bcfb7e6a4a33cb230bbe1ab719d4b58e067283df91ce5311be6d2d595fc8c19e2ae6ecc652499415614b3e  linux-4.4.tar.xz
697e6dd2b85da13ae65ac70b9654c9c3fa00c3120d425fdb53104fc234457cda40b9f0ebe29e7ae5c1a191730666c0bbd291721b16623ee8e402287771f20def  patch-4.4.11.xz
77818e23a9ae1854589da425377f8ea96581166597a18f5fd70f1cfca2a7049d42aea239c25836e91702436b079369f0aa427c4eee58e43d1e4d5dcf7d62488d  linux-4.4.y-rpi-20160514.patch
abe4d482a98450335eb935cf49be468accc8955a464553c45280f15d4114a87e96b158800536c2f6c09be07474386bef952d1f96e58eaac5a4f6d6bd47e845c1  rpi-cirrus-4.4.y-20160514.patch
36724ba56cb8fdf3a3d347cffb67ae1cc3d7b1052d526b6b5134ebf6baae9f9724b586c97833453dc7697ab24699426f0749af78b6a80be36967a80033a0cf40  gpio-mcp23s08-pullups.patch
3a711e2cdb6c0ecaceb3755437d38626dec8403e8aa167a6e16f64d8a8b7cc5bdc7e04aa7c05938719ebc90e319ec4124ee2151a7855e7838ee143b62d140ad0  rotary-encoder-fix.patch
501c91bf2538a18102da59bbccc3097f9c3c90079acc0e946ff075074160c09b8a66934e5ce5470e170f0e4f93d114709a95230367426d0bb7ea02c4bdf4cc9b  issue-4973.patch
9e1e54c1a9e5a5cce72d96c875e759b1354ab8fbf4a09eeb1d21078de1b43a2d762bac6351e9df959930c0f08bf62696efb80b6cae17af7203860f62d78b6597  config-rpi.armhf
7a9fb5d10766d72a117a305598386e7d5b6bd69d49e56d6419050f884fbf81573a5008d752f099e78519121e98beb5f6f2e359ce22509f9547ac30733b3b0654  config-rpi2.armhf
a4ecd1f48db64f9d6a189250d1937d7f2cd3a049a3d24cc527d04d05db06137722f1ba44bcd6033794781c3f2cfe2fbe065410a16de4bfdf4b1cd95d89322a77  markdt"