#!/bin/sh
#  _____               _           _
# |   __|___ ___ ___ _| |___ _____| |_ ___ ___ ___
# |   __|  _| -_| -_| . | . |     | . | . |   | -_|
# |__|  |_| |___|___|___|___|_|_|_|___|___|_|_|___|
#
#                              Freedom in the Cloud
#
# Hardware setup based on bin/freedombox-hardware-setup from freedom-maker
#
# License
# =======
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

PROJECT_NAME='freedombone'

export TEXTDOMAIN=${PROJECT_NAME}-image-hardware-setup
export TEXTDOMAINDIR="/usr/share/locale"

enable_serial_console() {
    # By default, spawn a console on the serial port
    device="$1"
    echo "Adding a getty on the serial port"
    echo "T0:12345:respawn:/sbin/getty -L $device 115200 vt100" >> /etc/inittab
}

beaglebone_setup_boot() {

    # Setup uEnv.txt
    if grep -q btrfs /etc/fstab ; then
        fstype=btrfs
    else
        fstype=ext4
    fi
    # shellcheck disable=SC2012
    kernelVersion=$(ls /usr/lib/*/am335x-boneblack.dtb | head -1 | cut -d/ -f4)
    version=$(echo "$kernelVersion" | sed 's/linux-image-\(.*\)/\1/')
    initRd=initrd.img-$version
    vmlinuz=vmlinuz-$version

    bbb_loadaddr='0x82000000'
    bbb_initrd_addr='0x88080000'
    bbb_fdtaddr='0x88000000'

    # uEnv.txt for Beaglebone
    # based on https://github.com/beagleboard/image-builder/blob/master/target/boot/beagleboard.org.txt
    cat >> /boot/uEnv.txt <<EOF
mmcroot=/dev/mmcblk0p2 ro
mmcrootfstype=$fstype rootwait fixrtc
mmcrootflags=subvol=@

console=ttyO0,115200n8

kernel_file=$vmlinuz
initrd_file=$initRd

loadaddr=$bbb_loadaddr
initrd_addr=$bbb_initrd_addr
fdtaddr=$bbb_fdtaddr

initrd_high=0xffffffff
fdt_high=0xffffffff

loadkernel=load mmc \${mmcdev}:\${mmcpart} \${loadaddr} \${kernel_file}
loadinitrd=load mmc \${mmcdev}:\${mmcpart} \${initrd_addr} \${initrd_file}; setenv initrd_size \${filesize}
loadfdt=load mmc \${mmcdev}:\${mmcpart} \${fdtaddr} /dtbs/\${fdtfile}

loadfiles=run loadkernel; run loadinitrd; run loadfdt
mmcargs=setenv bootargs init=/lib/systemd/systemd console=tty0 console=\${console} root=\${mmcroot} rootfstype=\${mmcrootfstype} rootflags=\${mmcrootflags} ifnames=0 slub_debug=FZP slab_nomerge page_poison=1

uenvcmd=run loadfiles; run mmcargs; bootz \${loadaddr} \${initrd_addr}:\${initrd_size} \${fdtaddr}
EOF

    mkdir -p /boot/dtbs
    cp /usr/lib/linux-image-*-armmp/* /boot/dtbs
}

beaglebone_flash() {
    # allow flash-kernel to work without valid /proc contents
    # ** this doesn't *really* work, since there are too many checks
    #    that fail in an emulated environment!  We'll have to do it by
    #    hand below anyway...
    export FK_MACHINE="TI AM335x BeagleBone Black"
    apt-get install -y flash-kernel
}

beaglebone_repack_kernel() {
    # process installed kernel to create uImage, uInitrd, dtb
    # using flash-kernel would be a good approach, except it fails in the
    # cross build environment due to too many environment checks...
    #FK_MACHINE="TI AM335x BeagleBone" flash-kernel
    #  so, let's do it manually...

    # flash-kernel's hook-functions provided to mkinitramfs have the
    # unfortunate side-effect of creating /conf/param.conf in the initrd
    # when run from our emulated chroot environment, which means our root=
    # on the kernel command line is completely ignored!  repack the initrd
    # to remove this evil...

    echo "info: repacking beaglebone kernel and initrd"

    bbb_dtb='am335x-boneblack'

    # shellcheck disable=SC2012
    kernelVersion=$(ls /usr/lib/*/${bbb_dtb}.dtb | head -1 | cut -d/ -f4)
    version=$(echo "$kernelVersion" | sed 's/linux-image-\(.*\)/\1/')
    initRd=initrd.img-$version
    vmlinuz=vmlinuz-$version

    # optionally use a separately compiled kernel
    bbb_dtb_file=/usr/lib/$kernelVersion/${bbb_dtb}.dtb
    #if [ -f /boot/bbb.tar.gz ]; then
    #    cd /boot
    #    tar -xzvf /boot/bbb.tar.gz
    #    if [ -f /boot/bbb/dtbs/${bbb_dtb}.dtb ]; then
    #        if [ -f /boot/bbb/zImage ]; then
    #            bbb_dtb_file=/boot/bbb/dtbs/${bbb_dtb}.dtb
    #            vmlinuz=/boot/bbb/zImage
    #        fi
    #    fi
    #fi

    mkdir /tmp/initrd-repack

    (cd /tmp/initrd-repack || exit 2468246 ; \
     zcat "/boot/$initRd" | cpio -i ; \
     rm -f conf/param.conf ; \
     find . | cpio --quiet -o -H newc | \
         gzip -9 > "/boot/$initRd" )

    rm -rf /tmp/initrd-repack

    (cd /boot || exit 246824684 ; \
     cp "${bbb_dtb_file}" dtb ; \
     cat "$vmlinuz" dtb >> temp-kernel ; \
     mkimage -A arm -O linux -T kernel -n "Debian kernel ${version}" \
             -C none -a 0x82000000 -e 0x82000000 -d temp-kernel uImage ; \
     rm -f temp-kernel ; \
     mkimage -A arm -O linux -T ramdisk -C gzip -a 0x88080000 -e 0x88080000 \
             -n "Debian ramdisk ${version}" \
             -d "$initRd" uInitrd )
}

a20_setup_boot() {
    dtb="$1"

    # Setup boot.cmd
    if grep -q btrfs /etc/fstab ; then
        fstype=btrfs
    else
        fstype=ext4
    fi
    # shellcheck disable=SC2012,SC2086
    kernelVersion=$(ls /usr/lib/*/$dtb | head -1 | cut -d/ -f4)
    version=$(echo "$kernelVersion" | sed 's/linux-image-\(.*\)/\1/')
    initRd=initrd.img-$version
    vmlinuz=vmlinuz-$version

    # Create boot.cmd
    cat >> /boot/boot.cmd <<EOF
setenv mmcdev 0
setenv mmcpart 1

setenv mmcroot /dev/mmcblk0p2 ro
setenv mmcrootfstype $fstype rootwait fixrtc
setenv mmcrootflags subvol=@

setenv console ttyS0,115200n8

setenv kernel_file $vmlinuz
setenv initrd_file $initRd
setenv fdtfile $dtb

setenv loadaddr 0x46000000
setenv initrd_addr 0x48000000
setenv fdtaddr 0x47000000

setenv initrd_high 0xffffffff
setenv fdt_high 0xffffffff

setenv loadkernel load mmc \${mmcdev}:\${mmcpart} \${loadaddr} \${kernel_file}
setenv loadinitrd load mmc \${mmcdev}:\${mmcpart} \${initrd_addr} \${initrd_file}\\; setenv initrd_size \\\${filesize}
setenv loadfdt load mmc \${mmcdev}:\${mmcpart} \${fdtaddr} /dtbs/\${fdtfile}

setenv loadfiles run loadkernel\\; run loadinitrd\\; run loadfdt
setenv mmcargs setenv bootargs init=/lib/systemd/systemd console=\${console} root=\${mmcroot} rootfstype=\${mmcrootfstype} rootflags=\${mmcrootflags} ifnames=0 slub_debug=FZP slab_nomerge page_poison=1

run loadfiles; run mmcargs; bootz \${loadaddr} \${initrd_addr}:\${initrd_size} \${fdtaddr}
EOF

    # boot.scr for Allwinner A20 based device
    mkimage -C none -A arm -T script -d /boot/boot.cmd /boot/boot.scr

    # Copy all DTBs
    mkdir -p /boot/dtbs
    # shellcheck disable=SC2086
    cp /usr/lib/$kernelVersion/* /boot/dtbs

    # extra boot modules
    echo "rtc_sunxi" >> /etc/initramfs-tools/modules
}


setup_flash_kernel() {
    if [ ! -d /etc/flash-kernel ] ; then
       mkdir /etc/flash-kernel
    fi
    printf "%s" "$1" > /etc/flash-kernel/machine

    command_line=""
    if [ -n "$2" ] ; then
        command_line="console=$2"
    fi

    if [ -n "$command_line" ] ; then
        echo "flash-kernel flash-kernel/linux_cmdline string \"$command_line\"" | debconf-set-selections
    fi

    apt-get install -y flash-kernel
}

case "$MACHINE" in
    beaglebone)
        beaglebone_setup_boot
        beaglebone_flash
        beaglebone_repack_kernel
        enable_serial_console ttyO0
        ;;
    cubietruck)
        a20_setup_boot sun7i-a20-cubietruck.dtb
        enable_serial_console ttyS0
        ;;
    a20-olinuxino-lime)
        a20_setup_boot sun7i-a20-olinuxino-lime.dtb
        enable_serial_console ttyS0
        ;;
    a20-olinuxino-lime2)
        a20_setup_boot sun7i-a20-olinuxino-lime2.dtb
        enable_serial_console ttyS0
        ;;
    a20-olinuxino-micro)
        a20_setup_boot sun7i-a20-olinuxino-micro.dtb
        enable_serial_console ttyS0
        ;;
    cubieboard2)
        a20_setup_boot sun7i-a20-cubieboard2.dtb
        enable_serial_console ttyS0
        ;;
    pcduino3)
        a20_setup_boot sun7i-a20-pcduino3.dtb
        enable_serial_console ttyS0
        ;;
esac