# Reference: <https://postmarketos.org/vendorkernel>
# Mainline kernel + the (not-yet-upstream) Motorola rtwo device tree.
# Config base: linux-postmarketos-mainline's config-mainline.aarch64.
maintainer="snlavaise <snlavaise@gmail.com>"
_flavor="postmarketos-qcom-sm8550"
pkgname=linux-$_flavor
pkgver=7.2
pkgrel=7
pkgdesc="Mainline kernel for Qualcomm SM8550 (Snapdragon 8 Gen 2) + Motorola rtwo"
arch="aarch64"
_carch="arm64"
url="https://kernel.org"
license="GPL-2.0-only"
options="
	!check
	!strip
	!tracedeps
	pmb:cross-native
	pmb:kconfigcheck-community
"
makedepends="
	bash
	bison
	clang
	diffutils
	elfutils-dev
	findutils
	flex
	gmp-dev
	kmod
	linux-headers
	lld
	llvm
	mpc1-dev
	mpfr-dev
	openssl-dev
	pahole
	perl
	postmarketos-installkernel
	python3
	xz
	zstd
"

source="
	$pkgname-$pkgver.tar.gz::https://git.kernel.org/torvalds/t/linux-${pkgver/_/-}.tar.gz
	config-motorola-rtwo.aarch64
	rtwo.config
	sm8550-motorola-rtwo.dts
"
builddir="$srcdir/linux-${pkgver/_/-}"

prepare() {
	default_prepare

	# The Motorola rtwo (Moto Edge 40 Pro) device tree is not upstream yet.
	local _dtsdir="arch/$_carch/boot/dts/qcom"
	cp "$srcdir/sm8550-motorola-rtwo.dts" "$_dtsdir/sm8550-motorola-rtwo.dts"
	if ! grep -q "sm8550-motorola-rtwo.dtb" "$_dtsdir/Makefile"; then
		sed -i '/sm8550-mtp\.dtb/a dtb-$(CONFIG_ARCH_QCOM) += sm8550-motorola-rtwo.dtb' \
			"$_dtsdir/Makefile"
	fi

	# Base config (from linux-postmarketos-mainline) + rtwo bring-up fragment.
	cp "$srcdir/config-motorola-rtwo.aarch64" .config
	cat "$srcdir/rtwo.config" >> .config
	make ARCH="$_carch" LLVM=1 olddefconfig
}

build() {
	unset LDFLAGS
	make ARCH="$_carch" LLVM=1 \
		KBUILD_BUILD_VERSION="$((pkgrel + 1))-$_flavor"
}

package() {
	# The Motorola bootloader boots a *raw* uncompressed arm64 Image
	# (BOARD_KERNEL_IMAGE_NAME := Image); Image.gz / vmlinuz.efi make it
	# reset in <2s. CONFIG_EFI_ZBOOT is off in rtwo.config.
	install -Dm644 "$builddir/arch/$_carch/boot/Image" \
		"$pkgdir/boot/vmlinuz"

	make modules_install dtbs_install \
		ARCH="$_carch" \
		LLVM=1 \
		INSTALL_MOD_PATH="$pkgdir"/usr \
		INSTALL_MOD_STRIP=1 \
		INSTALL_DTBS_PATH="$pkgdir"/boot/dtbs

	# Android DT-overlay image with a single no-op overlay. The bootloader
	# would otherwise apply the stock kalama dtbo overlay onto our mainline
	# base DTB - the phandles don't match, the merged tree is corrupt and
	# the kernel panics. A no-op overlay keeps the base DTB intact. (A
	# zero-entry table fails Motorola's pre-flash validation.)
	mkdir -p "$pkgdir"/boot
	printf '/dts-v1/;\n/plugin/;\n/ { };\n' > "$srcdir"/empty-overlay.dts
	scripts/dtc/dtc -@ -O dtb -o "$srcdir"/empty.dtbo "$srcdir"/empty-overlay.dts
	python3 - "$srcdir/empty.dtbo" "$pkgdir/boot/dtbo.img" <<-'EOF'
		import struct, sys
		fdt = open(sys.argv[1], "rb").read()
		hdr_sz = ent_sz = 32
		ent_off = hdr_sz + ent_sz
		hdr = struct.pack(">IIIIIIII", 0xd7b7ab1e, ent_off + len(fdt),
				 hdr_sz, ent_sz, 1, hdr_sz, 2048, 0)
		ent = struct.pack(">IIIIIIII", len(fdt), ent_off, 0, 0, 0, 0, 0, 0)
		blob = hdr + ent + fdt
		blob += b"\x00" * ((4096 - len(blob) % 4096) % 4096)
		open(sys.argv[2], "wb").write(blob)
	EOF

	rm -f "$pkgdir"/usr/lib/modules/*/build "$pkgdir"/usr/lib/modules/*/source

	install -Dm644 "$builddir"/include/config/kernel.release \
		"$pkgdir"/usr/share/kernel/"$_flavor"/kernel.release
}

# 'pmbootstrap checksum linux-postmarketos-qcom-sm8550' fills in the tarball hash
# (same tarball as linux-postmarketos-mainline, ~150 MB download).
sha512sums="
52d5aa7f94f6aa6141debf4ceb4fc7a2e75505a7cd38b8854e501be83c2b57863020f463f2fdb2fc93667e6cfe13274d077e5207a611e4797bd9404ee0e64c58  linux-postmarketos-qcom-sm8550-7.2.tar.gz
f9ae52489f6b9e6fef64952943cd09732a5bef90a0e8765db03c256483028368687d6d5a1d80dd813a513e7e80d91f8b47f49b91cff67266b76f1d6275a7fea0  config-motorola-rtwo.aarch64
53441c23146d76bb0eaa358a25f6cce4f21740cfb65b755df52bbb218daf2cda30b3d80fa6ca4e283ea1afe2b0fa708307b678b421898100710b8fb99b08d6c5  rtwo.config
43f5147f474ad4fbbc926e21b1305991b04c88bac869c684aee6fa4bb548663c4079d4d389a002ed3502af746566cf8fc31261221825c8f3c6b3949fc36c518d  sm8550-motorola-rtwo.dts
"
