# Copyright 2020-2024 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

KERNEL_IUSE_GENERIC_UKI=1
KERNEL_IUSE_MODULES_SIGN=1

inherit kernel-build toolchain-funcs

MY_P=linux-${PV%.*}
GENPATCHES_P=genpatches-${PV%.*}-$(( ${PV##*.} + 3 ))
# https://koji.fedoraproject.org/koji/packageinfo?packageID=8
# forked to https://github.com/projg2/fedora-kernel-config-for-gentoo
CONFIG_VER=6.12.1-gentoo
GENTOO_CONFIG_VER=g14
REFORM_CONFIG_HASH=5a35b0f35c628f6db3441e46c2c2748219efead1

DESCRIPTION="Linux kernel built with Gentoo patches and patches for the MNT Reform 2 laptop."
HOMEPAGE="
        https://wiki.gentoo.org/wiki/Project:Distribution_Kernel
        https://wiki.gentoo.org/wiki/MNT_Reform
        https://source.mnt.re/reform/reform-debian-packages
        https://mntre.com/reform.html
        https://www.kernel.org/
"
SRC_URI+="
        https://cdn.kernel.org/pub/linux/kernel/v$(ver_cut 1).x/${MY_P}.tar.xz
        https://source.mnt.re/reform/reform-debian-packages/-/archive/${REFORM_CONFIG_HASH}/reform-debian-packages-${REFORM_CONFIG_HASH}.tar.gz
        https://dev.gentoo.org/~mpagano/dist/genpatches/${GENPATCHES_P}.base.tar.xz
        https://dev.gentoo.org/~mpagano/dist/genpatches/${GENPATCHES_P}.extras.tar.xz
        https://github.com/projg2/gentoo-kernel-config/archive/${GENTOO_CONFIG_VER}.tar.gz
                -> gentoo-kernel-config-${GENTOO_CONFIG_VER}.tar.gz
        https://raw.githubusercontent.com/projg2/fedora-kernel-config-for-gentoo/${CONFIG_VER}/kernel-aarch64-fedora.config
                -> kernel-aarch64-fedora.config.${CONFIG_VER}
"

S=${WORKDIR}/${MY_P}

LICENSE="GPL-2"
KEYWORDS="~arm64"
IUSE="debug hardened"

RDEPEND="
        !sys-kernel/gentoo-kernel-bin:${SLOT}
"
BDEPEND="
        debug? ( dev-util/pahole )
"
PDEPEND="
        >=virtual/dist-kernel-${PV}
"

QA_FLAGS_IGNORED="
        usr/src/linux-.*/scripts/gcc-plugins/.*.so
        usr/src/linux-.*/vmlinux
        usr/src/linux-.*/arch/powerpc/kernel/vdso.*/vdso.*.so.dbg
"

src_prepare() {
        local PATCHES=(
                # meh, genpatches have no directory
                "${WORKDIR}"/*.patch
                # Patches for the i.MX8MPlus
                "${WORKDIR}"/reform-debian-packages-${REFORM_CONFIG_HASH}/linux/patches${PV%.*}/imx8mp-mnt-reform2/*.patch
                # Patches for the i.MX8MPlus pocket reform
                "${WORKDIR}"/reform-debian-packages-${REFORM_CONFIG_HASH}/linux/patches${PV%.*}/imx8mp-mnt-pocket-reform/*/*.patch
                # Patches for the i.MX8MQ
                "${WORKDIR}"/reform-debian-packages-${REFORM_CONFIG_HASH}/linux/patches${PV%.*}/imx8mq-mnt-reform2/*.patch
                # Patches for the LS1028A
                "${WORKDIR}"/reform-debian-packages-${REFORM_CONFIG_HASH}/linux/patches${PV%.*}/ls1028a-mnt-reform2/*.patch
                # Patches for the Bananapi cm4
                "${WORKDIR}"/reform-debian-packages-${REFORM_CONFIG_HASH}/linux/patches${PV%.*}/meson-g12b-bananapi-cm4-mnt-reform2/*.patch
                # Patches for the Bananapi cm4 pocket reform
                "${WORKDIR}"/reform-debian-packages-${REFORM_CONFIG_HASH}/linux/patches${PV%.*}/meson-g12b-bananapi-cm4-mnt-pocket-reform/*.patch
                # Patches for the rk3588
                "${WORKDIR}"/reform-debian-packages-${REFORM_CONFIG_HASH}/linux/patches${PV%.*}/rk3588-mnt-reform2/*.patch

        )
        default

        local biendian=false

        # prepare the default config
        case ${ARCH} in
                arm64)
                        cp "${DISTDIR}/kernel-aarch64-fedora.config.${CONFIG_VER}" .config || die
                        biendian=true
                        ;;
                *)
                        die "Unsupported arch ${ARCH}"
                        ;;
        esac

        # Device tree for i.MX8MQ
        mv ${WORKDIR}/${MY_P}/arch/arm64/boot/dts/freescale/imx8mq-mnt-reform2.dts{,.orig}
        cp ${WORKDIR}/reform-debian-packages-${REFORM_CONFIG_HASH}/linux/imx8mq-mnt-reform2.dts ${WORKDIR}/${MY_P}/arch/arm64/boot/dts/freescale/imx8mq-mnt-reform2.dts
        # There is already a device tree for the mnt reform upstream. We are replacing it. No need to modify the Makefile.
        cp ${WORKDIR}/reform-debian-packages-${REFORM_CONFIG_HASH}/linux/imx8mq-mnt-reform2-hdmi.dts ${WORKDIR}/${MY_P}/arch/arm64/boot/dts/freescale/imx8mq-mnt-reform2-hdmi.dts
        sed --in-place --expression='/imx8mq-mnt-reform2.dtb/a dtb-$(CONFIG_ARCH_MXC) += imx8mq-mnt-reform2-hdmi.dtb' ${WORKDIR}/${MY_P}/arch/arm64/boot/dts/freescale/Makefile

        # Device tree for i.MX8MPlus
        cp ${WORKDIR}/reform-debian-packages-${REFORM_CONFIG_HASH}/linux/imx8mp-mnt-reform2.dts ${WORKDIR}/${MY_P}/arch/arm64/boot/dts/freescale/imx8mp-mnt-reform2.dts
        sed --in-place --expression='/imx8mq-mnt-reform2.dtb/a dtb-$(CONFIG_ARCH_MXC) += imx8mp-mnt-reform2.dtb'  ${WORKDIR}/${MY_P}/arch/arm64/boot/dts/freescale/Makefile

        # Device tree for i.MX8MPlus pocket reform
        cp ${WORKDIR}/reform-debian-packages-${REFORM_CONFIG_HASH}/linux/imx8mp-mnt-pocket-reform.dts ${WORKDIR}/${MY_P}/arch/arm64/boot/dts/freescale/imx8mp-mnt-pocket-reform.dts
        sed --in-place --expression='/imx8mq-mnt-reform2.dtb/a dtb-$(CONFIG_ARCH_MXC) += imx8mp-mnt-pocket-reform.dtb'  ${WORKDIR}/${MY_P}/arch/arm64/boot/dts/freescale/Makefile

        # Device tree for LS1028A
        cp ${WORKDIR}/reform-debian-packages-${REFORM_CONFIG_HASH}/linux/fsl-ls1028a-mnt-reform2.dts ${WORKDIR}/${MY_P}/arch/arm64/boot/dts/freescale/fsl-ls1028a-mnt-reform2.dts
        sed --in-place --expression='/fsl-ls1028a-rdb.dtb/a dtb-$(CONFIG_ARCH_LAYERSCAPE) += fsl-ls1028a-mnt-reform2.dtb' ${WORKDIR}/${MY_P}/arch/arm64/boot/dts/freescale/Makefile

        # Device tree for the Bananapi cm4
        cp ${WORKDIR}/reform-debian-packages-${REFORM_CONFIG_HASH}/linux/meson-g12b-bananapi-cm4-mnt-reform2.dts ${WORKDIR}/${MY_P}/arch/arm64/boot/dts/amlogic/meson-g12b-bananapi-cm4-mnt-reform2.dts
        # There is already a device tree for the mnt reform upstream. We are replacing it. No need to modify the Makefile.

        # Device tree for the Bananapi cm4 pocket reform
        cp ${WORKDIR}/reform-debian-packages-${REFORM_CONFIG_HASH}/linux/meson-g12b-bananapi-cm4-mnt-pocket-reform.dts ${WORKDIR}/${MY_P}/arch/arm64/boot/dts/amlogic/meson-g12b-bananapi-cm4-mnt-pocket-reform.dts
        sed --in-place --expression='/meson-g12b-bananapi-cm4-mnt-reform2.dtb/a dtb-$(CONFIG_ARCH_MESON) += meson-g12b-bananapi-cm4-mnt-pocket-reform.dtb' ${WORKDIR}/${MY_P}/arch/arm64/boot/dts/amlogic/Makefile

        # Device tree for the rk3588
        cp ${WORKDIR}/reform-debian-packages-${REFORM_CONFIG_HASH}/linux/rk3588-mnt-reform2.dts ${WORKDIR}/${MY_P}/arch/arm64/boot/dts/rockchip/rk3588-mnt-reform2.dts
        sed --in-place --expression='/rk3588-rock-5b.dtb/a dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-mnt-reform2.dtb' ${WORKDIR}/${MY_P}/arch/arm64/boot/dts/rockchip/Makefile

        # Device tree for 

        local myversion="-gentoo-dist-reform2"
        use hardened && myversion+="-hardened"
        echo "CONFIG_LOCALVERSION=\"${myversion}\"" > "${T}"/version.config || die
        local dist_conf_path="${WORKDIR}/gentoo-kernel-config-${GENTOO_CONFIG_VER}"
        local reform_conf_path="${WORKDIR}/reform-debian-packages-${REFORM_CONFIG_HASH}/linux/config"

        local merge_configs=(
                "${T}"/version.config
                "${dist_conf_path}"/base.config
                "${reform_conf_path}"
                "${FILESDIR}"/config
        )
        use debug || merge_configs+=(
                "${dist_conf_path}"/no-debug.config
        )
        if use hardened; then
                merge_configs+=( "${dist_conf_path}"/hardened-base.config )

                tc-is-gcc && merge_configs+=( "${dist_conf_path}"/hardened-gcc-plugins.config )

                if [[ -f "${dist_conf_path}/hardened-${ARCH}.config" ]]; then
                        merge_configs+=( "${dist_conf_path}/hardened-${ARCH}.config" )
                fi
        fi

        # this covers ppc64 and aarch64_be only for now
        if [[ ${biendian} == true && $(tc-endian) == big ]]; then
                merge_configs+=( "${dist_conf_path}/big-endian.config" )
        fi

        use secureboot && merge_configs+=( "${dist_conf_path}/secureboot.config" )

        kernel-build_merge_configs "${merge_configs[@]}"
}