#!/bin/bash

# SPDX-License-Identifier: MIT

set -x
set -e

unset LC_CTYPE
unset LANG

export DEBOOTSTRAP=debootstrap

handle_crosscompile()
{
        if [ "`uname -m`" != 'aarch64' ]; then
                export ARCH=arm64
                export CROSS_COMPILE=aarch64-linux-gnu-
                export DEBOOTSTRAP=qemu-debootstrap
        fi
}

build_linux()
{
(
        handle_crosscompile
        test -d linux || git clone --depth 1 https://github.com/AsahiLinux/linux -b asahi
        cd linux
        git fetch
        git reset --hard origin/asahi; git clean -f -x -d &> /dev/null
        curl -s https://tg.st/u/40c9642c7569c52189f84621316fc9149979ee65.patch | git am -
        curl -s https://tg.st/u/0001-4k-iommu-patch-2022-03-11.patch | git am -
        curl -s https://tg.st/u/WQRL.patch | git am -
        curl -s https://tg.st/u/config-2022-03-17-distro-sven-jannau.txt > .config
        make olddefconfig
        make -j `nproc` V=0 bindeb-pkg > /dev/null
)
}

build_m1n1()
{
(
        test -d m1n1 || git clone --recursive https://github.com/jannau/m1n1
        cd m1n1
        git fetch
        git reset --hard origin/display_fb_alloc; git clean -f -x -d &> /dev/null
        make -j `nproc`
)
}

build_uboot()
{
(
        handle_crosscompile
        test -d u-boot || git clone --depth 1 https://github.com/AsahiLinux/u-boot
        cd u-boot
        git fetch
        git reset --hard origin/asahi; git clean -f -x -d &> /dev/null
        make apple_m1_defconfig
        make -j `nproc`
)

        cat m1n1/build/m1n1.bin   `find linux/arch/arm64/boot/dts/apple/ -name \*.dtb` <(gzip -c u-boot/u-boot-nodtb.bin) > 4k.bin
        display=3840x2160 >> 4k.bin
}


mkdir -p build
cd build

sudo apt-get install -y build-essential bash git locales gcc-aarch64-linux-gnu libc6-dev-arm64-cross device-tree-compiler imagemagick ccache eatmydata debootstrap pigz libncurses-dev qemu-user-static binfmt-support rsync git flex bison bc kmod cpio libncurses5-dev libelf-dev:native libssl-dev dwarves

build_linux
build_m1n1
build_uboot