# APKBUILD based on linux-vanilla aport. Changes:
# - add findutils makedepend (necessary for the initramfs)
# - it builds an initramfs - do not use ramdisk.cpio and
#	ramdisk-recovery.cpio, in there, always use the
#	initramfs from the kernel2 partition ("isorec")
# - directly boot to that initramfs, not only when the recovery
#	key combination was pressed.
# - use Alpine's busybox-static instead of the pre-compiled
#	binary, that comes with the source
# - reduce lzo compression because Alpine's busybox doesn't
#	support high compression
# - add kernel modules installation
# - add wifi firmware from vendor files
#
# Kernel config changes, based on: arch/arm/configs/janice_defconfig
# - enable devtmpfs (needed for udev -> touch support in weston)

_vendor=samsung
_flavor=samsung-i9070
_hash="ac7219c4b8dcec7bc5a598d42c6be0db4aa36332"
_hash_vendor_files="e24d9687e7fda4f94fc6652d137ed8e703930c3a"
_config="config-${_flavor}.armhf"
_src_tgz="linux-${_flavor}-${_hash}.tar.gz"
_vendor_files_tgz="vendor-files-${_flavor}-${_hash_vendor_files}.tar.gz"

pkgname=linux-${_flavor}
pkgver=3.0.101
case $pkgver in
	*.*.*)  _kernver=${pkgver%.*};;
	*.*) _kernver=$pkgver;;
esac
pkgrel=4
arch="armhf"
pkgdesc="Samsung Galaxy S Advance kernel from Epirex"
url="https://github.com/Epirex/Samsung_STE_Kernel"
depends="postmarketos-mkinitfs"
makedepends="perl sed installkernel bash gmp-dev bc linux-headers elfutils-dev busybox-static-armhf"
options="!strip !check !tracedeps"
install=
source="
	$_src_tgz::https://github.com/Epirex/Samsung_STE_Kernel/archive/${_hash}.tar.gz
	$_vendor_files_tgz::https://github.com/Epirex/android_vendor_samsung_u8500/archive/${_hash_vendor_files}.tar.gz
	$_config
	00_fix_return_address.patch
	01_remove_ramdisks_from_initramfs.patch
	02_reduce_lzo_compression.patch
	03_change_modules_install_dir.patch
	04_change_dhd_firmware_dir.patch
	compiler-gcc6.h
	init
"
subpackages=""
license="GPL2"

_abi_release=${pkgver}
_carch="arm"
HOSTCC="${CC:-gcc}"
HOSTCC="${HOSTCC#${CROSS_COMPILE}}"

ksrcdir="$srcdir/Samsung_STE_Kernel-${_hash}"
vsrcdir="$srcdir/android_vendor_samsung_u8500-${_hash_vendor_files}"

prepare() {
	local _patch_failed=
	cd "$ksrcdir"

	# 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

	# Use Alpine's busybox.static instead of the pre-compiled busybox shipped
	# with the source
	cp -v /usr/$(arch_to_hostspec $arch)/bin/busybox.static \
		"$ksrcdir"/usr/u8500_initramfs_files/busybox

	# use custom init script in the initramfs which loads the initramfs from 
	# the kernel2 partition ("isorec")
	cp -v "$srcdir"/init "$ksrcdir"/usr/u8500_initramfs_files/init || return 1

	# gcc6 support
	cp -v "$srcdir/compiler-gcc6.h" "$ksrcdir/include/linux/" || return 1

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

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

build() {
	cd "$srcdir"/build
	unset LDFLAGS

	echo "--[ Build kernel ]--"
	make ARCH="$_carch" CC="${CC:-gcc}" \
		KBUILD_BUILD_VERSION="$((pkgrel + 1))-Alpine" \
		|| return 1

	echo "--[ Build modules ]--"
	# the 'no-pic' flag is necessary to avoid the 
	# error 'Unknown symbol _GLOBAL_OFFSET_TABLE_ (err 0)' when loading the module
	make ARCH="$_carch" CC="${CC:-gcc}" CFLAGS_MODULE="-fno-pic" \
		KBUILD_BUILD_VERSION="$((pkgrel + 1))-Alpine" CONFIG_NO_ERROR_ON_MISMATCH=y \
		modules || return 1
}

package() {
	echo "--[ Installing kernel ]--"
	install -Dm644 "$srcdir/build/arch/arm/boot/zImage" \
		"$pkgdir/boot/vmlinuz-$_flavor"

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

	cd "$srcdir"/build
	unset LDFLAGS

	echo "--[ Installing modules ]--"
	make ARCH="$_carch" CC="${CC:-gcc}" \
		KBUILD_BUILD_VERSION="$((pkgrel + 1))-Alpine" CONFIG_NO_ERROR_ON_MISMATCH=y \
		INSTALL_MOD_PATH="$pkgdir" modules_install \
		|| return 1

	echo "--[ Installing vendor files ]--"
	# install wifi firmware
	install -Dm644 "$vsrcdir/janice/system/etc/wifi/bcmdhd_sta.bin" \
		"$pkgdir/lib/firmware/postmarketos/bcmdhd_sta.bin"
	install -Dm644 "$vsrcdir/janice/system/etc/wifi/nvram_net.txt" \
		"$pkgdir/lib/firmware/postmarketos/nvram_net.txt"
}

sha512sums="5e9309a4329280f0cfbac6e5aae6465143a36197217ea72957e624b06ff724f4117b1309c5a535432ef008733723a605c90285d5740f7b798becd0130f2c0996  linux-samsung-i9070-ac7219c4b8dcec7bc5a598d42c6be0db4aa36332.tar.gz
8cb497e9403f5b9e39ad1725959c45f9bbeeb3331f0ddcb4f201f17fbe315b5b8cc5e62ca17179e4da24766697dc7ca8a1bf8f7c06552ca8dce69673f280399a  vendor-files-samsung-i9070-e24d9687e7fda4f94fc6652d137ed8e703930c3a.tar.gz
65ac788fc01180b803d8110333cbd0e30e742801647d6d4d813aaa6eca0c3d216f5daef0fc9583aef5a1ea2475d48567896da8e443781a1f08ff10ff8d6ea0a6  config-samsung-i9070.armhf
ea1d3b5a234fa565e3c1a792de48f4fc4e6023d281d303c8e319c7ef28edc5739ab0e4dea0139a41f0a5c7d03e27921ccaa214fd0ac5c72245a094ce60128864  00_fix_return_address.patch
c8f12ecf578be0c4600563134079b980a1079b08ac868302af8821022befe873aa94c67b9690ba87f5967f0a48939d15e871dc2d2862bed7b6a1d0c9a95cfd8f  01_remove_ramdisks_from_initramfs.patch
ef5b912c26fea4ab882592bdf7487942c64b123de8d25d08d976f29743f311742ee2f773bf2d110ddb5095f254dbb0bd4487c5cfce77311929082599199e7ebd  02_reduce_lzo_compression.patch
27bba6d070db6f499d030680c020906fc3238dc60d90a9b2f0f3a355ef15beb227c1cf48b7858156264fe10f7943772ed00a837be36ba4b80de8199f0383e688  03_change_modules_install_dir.patch
47533412cc91d2ead046039c90180ebc459e157017be85dca69cd882a183963448beb973f2cb7eaccbcd35354b0ed6a668131cd39ea30393dd52fd93b7e26815  04_change_dhd_firmware_dir.patch
d80980e9474c82ba0ef1a6903b434d8bd1b092c40367ba543e72d2c119301c8b2d05265740e4104ca1ac5d15f6c4aa49e8776cb44264a9a28dc551e0d1850dcc  compiler-gcc6.h
ef01c51c138239a49c1d00ae0074a07fed267d64934cf3d436a8ff057b91692ee2d040a45eacbb0dc62d5017a708c4dca2fadc282c850fa72aeebcfa787e2cbc  init"