# Maintainer: Milan P. Stanić <mps@arvanta.net>

_flavor=asahi-gpu
pkgname=linux-${_flavor}
pkgver=6.1.0
kver=${pkgver//_/-}
pkgdesc="Apple Silicon (M1 development kernel)"
case $pkgver in
	*.*.*)	_kernver=${pkgver%.*};;
	*.*) _kernver=$pkgver;;
esac
pkgrel=1
_commit_id=f9c7334caaa6c85f4ef1c920198e248630493004
url="https://www.kernel.org"
depends="initramfs-generator m1n1 u-boot-asahi"
_depends_dev="perl gmp-dev elfutils-dev bash flex bison"
makedepends="$_depends_dev sed bc linux-headers installkernel
	linux-firmware-any openssl-dev diffutils findutils"
options="!strip !check"
#subpackages="$pkgname-dev:_dev:$CBUILD_ARCH"
source="linux-asahi-$pkgver-${_commit_id}.tar.gz::https://github.com/AsahiLinux/linux/archive/${_commit_id}.tar.gz
	config

	sensors.patch
	fix-drm-atomic.patch
	t8103-j293.dts.patch
	t600x-enable-speaker.patch
	"

builddir="$srcdir/"linux-$_commit_id
arch="aarch64"
_carch="arm64"
license="GPL-2.0"

prepare() {
	local _patch_failed=
	cd $builddir
	case $pkgver in
		*.*.0);;
		*)
		msg "Applying patch-$pkgver.xz"
	#	unxz -c < "$srcdir"/patch-$pkgver.xz | patch -p1 -N ;;
	esac

	# 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 "$_patch_failed" ]; then
		error "The following patches failed:"
		cat failed
		return 1
	fi
  sed -i 's/^#EXTRAVERSION =/EXTRAVERSION =/' "$builddir"/Makefile
  sed -i 's/^EXTRAVERSION :=/#EXTRAVERSION :=/' "$builddir"/Makefile
	# remove localversion from patch if any
	rm -f localversion*
	oldconfig
}

oldconfig() {
		echo "-$pkgrel-$_flavor" > "$builddir"/localversion-alpine \
			|| return 1

		cp "$srcdir"/config "$builddir"/.config
		make LLVM=1 -C "$srcdir"/linux-$_commit_id \
			O="$builddir" \
			ARCH="$_carch" \
			listnewconfig oldconfig
}

build() {
	unset LDFLAGS
	export KBUILD_BUILD_TIMESTAMP="$(date -Ru${SOURCE_DATE_EPOCH:+d @$SOURCE_DATE_EPOCH})"
	cd $builddir
	make LLVM=1 ARCH="$_carch" \
		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-Alpine"
}

_package() {
	local _buildflavor="$1" _outdir="$2"
	local _abi_release=${kver}-${pkgrel}-${_buildflavor}
	export KBUILD_BUILD_TIMESTAMP="$(date -Ru${SOURCE_DATE_EPOCH:+d @$SOURCE_DATE_EPOCH})"

	cd $builddir
	# modules_install seems to regenerate a defect Modules.symvers on s390x. Work
	# around it by backing it up and restore it after modules_install
	cp Module.symvers Module.symvers.backup

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

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

	make LLVM=1 -j1 modules_install $_install \
		ARCH="$_carch" \
		INSTALL_MOD_PATH="$_outdir" \
		INSTALL_PATH="$_outdir"/boot \
		INSTALL_DTBS_PATH="$_outdir/boot/dtbs-$_buildflavor"

	cp Module.symvers.backup Module.symvers

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

	install -D -m644 include/config/kernel.release \
		"$_outdir"/usr/share/kernel/$_buildflavor/kernel.release
	cp "$builddir"/.config $pkgdir/boot/config-$_flavor

}

# main flavor installs in $pkgdir
package() {
	depends="$depends linux-firmware-any"

	_package $_flavor "$pkgdir"
}

_dev() {
	local _flavor=$(echo $subpkgname | sed -E 's/(^linux-|-dev$)//g')
	local _abi_release=${pkgver}-${pkgrel}-$_flavor
	# 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 $_flavor kernel"
	depends="$_depends_dev"
	local dir="$subpkgdir"/usr/src/linux-headers-${_abi_release}
	export KBUILD_BUILD_TIMESTAMP="$(date -Ru${SOURCE_DATE_EPOCH:+d @$SOURCE_DATE_EPOCH})"

	# first we import config, run prepare to set up for building
	# external modules, and create the scripts
	mkdir -p "$dir"
	cp "$srcdir"/config-$_flavor.${CARCH} "$dir"/.config
	echo "-$pkgrel-$_flavor" > "$dir"/localversion-alpine
	cd $builddir

  echo "Installing headers..."
  cp -t "$dir" -a $builddir/include

  install -Dt "${dir}" -m644 $builddir/Makefile
  install -Dt "${dir}/arch/${_carch}" -m644 $builddir/arch/${_carch}/Makefile
  install -Dt "${dir}/arch/${_carch}/kernel" -m644 $builddir/arch/${_carch}/kernel/asm-offsets.s
  cp -t "${dir}/arch/${_carch}" -a $builddir/arch/${_carch}/include

  install -Dt "$dir/drivers/md" -m644 drivers/md/*.h
  install -Dt "$dir/net/mac80211" -m644 net/mac80211/*.h

  # https://bugs.archlinux.org/task/13146
  install -Dt "$dir/drivers/media/i2c" -m644 drivers/media/i2c/msp3400-driver.h

  # https://bugs.archlinux.org/task/20402
  install -Dt "$dir/drivers/media/usb/dvb-usb" -m644 drivers/media/usb/dvb-usb/*.h
  install -Dt "$dir/drivers/media/dvb-frontends" -m644 drivers/media/dvb-frontends/*.h
  install -Dt "$dir/drivers/media/tuners" -m644 drivers/media/tuners/*.h

  # https://bugs.archlinux.org/task/71392
  install -Dt "$dir/drivers/iio/common/hid-sensors" -m644 drivers/iio/common/hid-sensors/*.h

  echo "Installing KConfig files..."
  find . -name 'Kconfig*' -exec install -Dm644 {} "$builddir/{}" \;

  echo "Removing unneeded architectures..."
  local arch
  for arch in "$dir"/arch/*/; do
		case $(basename "$arch") in $_carch) continue ;; esac
    echo "Removing $(basename "$arch")"
    rm -r "$arch"
  done

#  echo "Removing documentation..."
#  rm -r "$builddir/Documentation"

  echo "Removing broken symlinks..."
  find -L "$builddir" -type l -printf 'Removing %P\n' -delete

  echo "Removing loose objects..."
  find "$builddir" -type f -name '*.o' -printf 'Removing %P\n' -delete

  echo "Stripping build tools..."
  local file
  while read -rd '' file; do
    case "$(file -bi "$file")" in
      application/x-sharedlib\;*)      # Libraries (.so)
        strip -v $STRIP_SHARED "$file" ;;
      application/x-archive\;*)        # Libraries (.a)
        strip -v $STRIP_STATIC "$file" ;;
      application/x-executable\;*)     # Binaries
        strip -v $STRIP_BINARIES "$file" ;;
      application/x-pie-executable\;*) # Relocatable binaries
        strip -v $STRIP_SHARED "$file" ;;
    esac
  done < <(find "$builddir" -type f -perm -u+x ! -name vmlinux -print0)

  echo "Stripping vmlinux..."
  strip -v $STRIP_STATIC "$builddir/vmlinux"

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

sha512sums="
c42294f30b28561fca5c7ef51b9f8e911def8f95af91c5b36954afaa893f011ba84436cdf1b2c102002e0f245c2eb5bb40d3819cd3ae63b93f1c942a6c21b689  linux-asahi-6.1.0-f9c7334caaa6c85f4ef1c920198e248630493004.tar.gz
bb54c1db794502de02c5bac481f41b939efedaa5280f1002989f9ecc130f4355c9454e48f6d526fc93442add8d147cc90c0a25798462c090de919450a4c896b4  config
49dfcbc7e3d6d01fde548bfa4174e011fbb36ece94853d856e028f768da3ab156f77c01e0642e6d91f5f024f0c97d5de5847bb064e2a033f3237dfc66768049e  sensors.patch
c85a56d045f53bed26d066fe7bf5bf8f46867a96a6a8c8046c3720f42f6f303162b449bffea57d91a0bcf0b9ad701dcb5ef36659f4b88fec3016af6a6963f3aa  fix-drm-atomic.patch
84c2cc2a01f52c7815e6c85d2b16118f7cdd1754ed9b5fbc6357a722dd66b30825428a497aaf5512e2596487afa0ca844ae6569b3bf277bb6bbf78e47cc05a7f  t8103-j293.dts.patch
a42700005e58d26710814c9b13aab36bc6d4242a5ebf9eb694473c5f3172c4a63cc235ea743eeec41d4bbac80565b4d34fc07eb23f2aa4c7c5e4b8ff0ec2b4fa  t600x-enable-speaker.patch
"