#!/usr/bin/env bash

# Copyright 2017 The Fuchsia Authors
#
# Use of this source code is governed by a MIT-style
# license that can be found in the LICENSE file or at
# https://opensource.org/licenses/MIT

MEMBASE=0x00000000
KERNEL_OFFSET=0x00080000
RAMDISK_OFFSET=0x07c00000
DT_OFFSET=0x07a00000

CMDLINE=

SCRIPTS_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
ZIRCON_DIR="${SCRIPTS_DIR}/.."

MKBOOTIMG="${ZIRCON_DIR}/third_party/tools/android/mkbootimg"
MKDTIMG="${ZIRCON_DIR}/third_party/tools/android/mkdtimg"

help() {
    echo "usage: ${0} [options]"
    echo "  -b [build-dir]  Use specified build directory."
    echo "                  Defaults to build-kirin970/."
    echo "  -d [ramdisk]    Use specified ramdisk file."
    echo "                  Defaults to BUILD_DIR/bootdata.bin."
    echo "  -f              Download and flash firmware."
    echo "  -m              Add mexec option to kernel command line to enable netboot."
    echo "  -h              Show this help message."
    exit 1
}

help_fastboot() {
    echo
    echo "Check that the device is in fastboot mode:"
    echo "  Auto Power up(Switch 1)   closed/ON"
    echo "  Recovery(Switch 2)        open/OFF"
    echo "  Fastboot(Switch 3)        closed/ON"

    read -p "Proceed (y|n)? " -n 1 -r
    echo
    if [[ ! $REPLY =~ ^[Yy]$ ]]; then
        exit 1
    fi
}

git_clone() {
    git clone --depth 1 $@
}

flash_kernel() {
    "${MKBOOTIMG}" \
        --kernel $KERNEL \
        --kernel_offset $KERNEL_OFFSET \
        --base $MEMBASE \
        --ramdisk_offset $RAMDISK_OFFSET \
        --ramdisk "${RAMDISK}" \
        --tags_offset $DT_OFFSET \
        --cmdline "${CMDLINE}" \
        -o $OUT_IMAGE

    fastboot flash boot $OUT_IMAGE
    # Can't guarantee that the target has written image to flash before the
    # fastboot command completes, so short delay here before reboot.
    sleep 1
    fastboot reboot
}

while getopts "b:d:fmnp:ruh" FLAG; do
    case $FLAG in
    b) BUILD_DIR="${OPTARG}";;
    d) RAMDISK="${OPTARG}";;
    f) FLAG_FIRMWARE=true;;
    m) CMDLINE+=" netsvc.netboot=true";;
    *) help;;
    esac
done
shift $((OPTIND-1))

BUILD_DIR="${BUILD_DIR:-build-arm64}"
RAMDISK="${RAMDISK:-${BUILD_DIR}/kirin970-bootdata.bin}"
OUT_IMAGE="${BUILD_DIR}/boot.img"

BOARD=kirin970
BOOTDATA_BIN="${BUILD_DIR}/${BOARD}-zircon-bootimage.bin"
ZBOOTDATA_BIN="${BUILD_DIR}/z${BOARD}-zircon-bootimage.bin"
gzip -c ${BOOTDATA_BIN} > ${ZBOOTDATA_BIN}
KERNEL=${ZBOOTDATA_BIN}
RAMDISK="${BUILD_DIR}/dummy-ramdisk.bin"
dd if=/dev/zero of=${RAMDISK} bs=4096 count=1

flash_kernel