# Reference: <https://postmarketos.org/vendorkernel>
# Kernel config based on: arch/arm/configs/i9100_defconfig

pkgname=linux-samsung-i9100
pkgver=3.0.101
pkgrel=13
pkgdesc="Samsung Galaxy SII kernel fork"
arch="armhf"
_carch="arm"
_flavor="samsung-i9100"
url="https://kernel.org"
license="GPL-2.0-only"
options="!strip !check !tracedeps"
makedepends="perl sed installkernel bash gmp-dev bc linux-headers elfutils-dev devicepkg-dev
	findutils busybox-static-armhf"

# Compiler: latest GCC from Alpine
HOSTCC="${CC:-gcc}"
HOSTCC="${HOSTCC#${CROSS_COMPILE}}"

# Source
_repository="android_kernel_samsung_smdk4412"
_commit="349a3e91e76d17e67ef6213e1f6712e700695631"
_config="config-${_flavor}.${arch}"
source="
	$pkgname-$_commit.tar.gz::https://github.com/LineageOS/${_repository}/archive/${_commit}.tar.gz
	$_config
	gcc7-give-up-on-ilog2-const-optimizations.patch
	gcc8-fix-put-user.patch
	init
"

builddir="$srcdir/$_repository-${_commit}"

prepare_isorec() {
	# Use Alpine's busybox.static instead of the pre-compiled busybox shipped
	# with the source
	cp -v /usr/$(arch_to_hostspec $arch)/bin/busybox.static \
		"$builddir"/usr/galaxys2_initramfs_files/busybox

	# do not use ramdisk.cpio and ramdisk-recovery-device.cpio, always use
	# the initramfs from the recovery partition ("isorec"), so we can build
	# it later and independently from the kernel. also directly boot that
	# partition, not only when the recovery key combination was used.
	cd "$builddir"/usr/
	mv galaxys2_initramfs.list galaxys2_initramfs.list_old
	grep -v "../../ramdisk" galaxys2_initramfs.list_old > galaxys2_initramfs.list
	cp -v "$srcdir"/init "$builddir"/usr/galaxys2_initramfs_files/init

	# Paths supplied to gen_initramfs_list.sh are prefixed with "source/".
	ln -s "$builddir" ln -s "$builddir"/source
}

prepare() {
	default_prepare
	prepare_isorec

	cd "$builddir"
	downstreamkernel_prepare "$srcdir" "$builddir" "$_config" "$_carch" "$HOSTCC"
}

build() {
	unset LDFLAGS

	make ARCH="$_carch" CC="${CC:-gcc}" \
		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-postmarketOS"
}

package() {
	# kernel.release
	install -D "$builddir/include/config/kernel.release" \
		"$pkgdir/usr/share/kernel/$_flavor/kernel.release"

	# zImage (find the right one)
	cd "$builddir/arch/$_carch/boot"
	_target="$pkgdir/boot/vmlinuz-$_flavor"
	for _zimg in zImage-dtb Image.gz-dtb *zImage Image; do
		[ -e "$_zimg" ] || continue
		msg "zImage found: $_zimg"
		install -Dm644 "$_zimg" "$_target"
		break
	done
	if ! [ -e "$_target" ]; then
		error "Could not find zImage in $PWD!"
		return 1
	fi
}

sha512sums="285ffd2c82d0444b99da583573d19443b73de22d7382aae54413af229a28bebf4ea32ecbe248ae54ae64bbbc0af7d722b1ef86d5dd099e2990dcc6284fb195fa  linux-samsung-i9100-349a3e91e76d17e67ef6213e1f6712e700695631.tar.gz
087372ce82f8eae44694d7c6288822e5565c6bbed3a07cb42a6b009fa25a84a16ec44d76fe5f504bcf945e28237e1d62cf3686d1a60126525e3fdea2613cbb3c  config-samsung-i9100.armhf
77eba606a71eafb36c32e9c5fe5e77f5e4746caac292440d9fb720763d766074a964db1c12bc76fe583c5d1a5c864219c59941f5e53adad182dbc70bf2bc14a7  gcc7-give-up-on-ilog2-const-optimizations.patch
197d40a214ada87fcb2dfc0ae4911704b9a93354b75179cd6b4aadbb627a37ec262cf516921c84a8b1806809b70a7b440cdc8310a4a55fca5d2c0baa988e3967  gcc8-fix-put-user.patch
dd4094d5f4ec281d32f12af88cb22a782e497c8e52f69cf60b73ac7d6171fc95f1f8040b3d0ad2ff3f016d22ac1d91c5b522e5d03203534a76742bc55a082af5  init"
