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

_flavor=vanilla
pkgname=linux-${_flavor}
pkgver=4.4.59
case $pkgver in
	*.*.*)	_kernver=${pkgver%.*};;
	*.*) _kernver=$pkgver;;
esac
pkgrel=1
pkgdesc="Linux vanilla kernel"
url="http://kernel.org"
depends="mkinitfs linux-firmware"
makedepends="perl sed installkernel bash gmp-dev bc linux-headers"
options="!strip"
_config=${config:-config-vanilla.${CARCH}}
install=
source="https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/linux-$_kernver.tar.xz
	config-vanilla.aarch64
	config-vanilla.armhf
	config-vanilla.x86
	config-vanilla.x86_64

	0001-Add-dts-for-GIGABYTE-X-Gene-MP30-AR0.patch

	mm-enlarge-stack-guard-gap.patch
	mm-do-not-collapse-stack-guard-into-thp.patch
	mm-guard-against-under-sized-gap-in-unmapped_area-_topdown.patch
	"
if [ "${pkgver%.0}" = "$pkgver" ]; then
	source="$source
	https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/patch-$pkgver.xz"
fi
subpackages="$pkgname-dev"
arch="all"
license="GPL2"

_abi_release=${pkgver}
_carch=${CARCH}
case "$_carch" in
aarch64*) _carch="arm64" ;;
arm*) _carch="arm" ;;
esac

HOSTCC="${CC:-gcc}"
HOSTCC="${HOSTCC#${CROSS_COMPILE}}"

prepare() {
	local _patch_failed=
	cd "$srcdir"/linux-$_kernver
	if [ "$_kernver" != "$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

	mkdir -p "$srcdir"/build
	cp "$srcdir"/$_config "$srcdir"/build/.config || return 1
	make -C "$srcdir"/linux-$_kernver O="$srcdir"/build ARCH="$_carch" HOSTCC="$HOSTCC" \
		silentoldconfig
}

# this is so we can do: 'abuild menuconfig' to reconfigure kernel
menuconfig() {
	cd "$srcdir"/build || return 1
	make ARCH="$_carch" menuconfig
	cp .config "$startdir"/$_config
}

build() {
	cd "$srcdir"/build
	make ARCH="$_carch" CC="${CC:-gcc}" \
		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-Alpine" \
		|| return 1
}

package() {
	cd "$srcdir"/build

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

	local _install
	case "$CARCH" in
	aarch64*|arm*)	_install="zinstall dtbs_install" ;;
	*)		_install="install" ;;
	esac

	make -j1 modules_install firmware_install $_install \
		ARCH="$_carch" \
		INSTALL_MOD_PATH="$pkgdir" \
		INSTALL_PATH="$pkgdir"/boot \
		INSTALL_DTBS_PATH="$pkgdir"/usr/lib/linux-${_abi_release} \
		|| return 1

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

	install -D include/config/kernel.release \
		"$pkgdir"/usr/share/kernel/$_flavor/kernel.release
}

dev() {
	# 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 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"/$_config "$dir"/.config
	make -j1 -C "$srcdir"/linux-$_kernver O="$dir" ARCH="$_carch" HOSTCC="$HOSTCC" \
		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 "$srcdir"/build/Module.symvers \
		"$dir"/Module.symvers

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

sha512sums="13c8459933a8b80608e226a1398e3d1848352ace84bcfb7e6a4a33cb230bbe1ab719d4b58e067283df91ce5311be6d2d595fc8c19e2ae6ecc652499415614b3e  linux-4.4.tar.xz
897b4b7d4dc2b5a72f4497283d5b90336e6097e79872325255296c01498389c883f1a266f8732833ab492936fbdb1d32606b0c8e67136c7b90268352b56e8cad  config-vanilla.aarch64
2e8711861f7765cb35f70b905dc40189b1436afca11b35b3000a426d4c1afed2d9028ef71589e37340ed0c0e5e12abe45375d122712dec47d2edc0df7ea73faf  config-vanilla.armhf
74f1fe3bb14800688fca27c5dd7943d357af4f1f9703b04553d7479fcf6aabd0304a2df4b6f7fff65d6c7fecf86dae3199814d6516d30b7688b6f5f78b354070  config-vanilla.x86
bcf576c45626236928d987feaab3a3be0852a7cc33ede71f4148548a1146955df56bef82816f3285c2d4b1a44d26f99e35adb5bbeada0cf5d7a3db5b1939e804  config-vanilla.x86_64
ebc1b89ff0985246889f68c32fb0bd326eb0f015a97b913bf8e2b92855c75809d114c57aff8f3f74d120694f1c5891d7a11ebe4aadaadd1954a947e762bf121d  0001-Add-dts-for-GIGABYTE-X-Gene-MP30-AR0.patch
749e989c087ba5edaa912614314405f2fae8f416e9a5422c8d4ea3bda5ef549534fc10cac13437796a47ab502c216817ce99036c1d93ac0bfb79ebaf45f78c88  mm-enlarge-stack-guard-gap.patch
d19930b5525bdbe2278105a80b74035e18edea0290e1af3b62659cb1e73887adc2b1fbec7b6e0fb99e51146205eb5a464fa77cc7253c79ddd0d49f943b3458a6  mm-do-not-collapse-stack-guard-into-thp.patch
567b70b5f634d7d8f79f5f70f7fdf0aee46dab6b865d6a62ee5a5a0dded69eb47008d86f4d639b7261beedce6a7df44a1d3e51e0fe5902b4c51b6b83e3b146a3  mm-guard-against-under-sized-gap-in-unmapped_area-_topdown.patch
f74eabfcd0e02f99ca62b6ed601325226841374107a30e0856f44c790d9a27dcd66af50d2da3425f8522ea84ba9829c5ab36a999fc42aa5cc9d438eb43414437  patch-4.4.59.xz"