#!/bin/bash
#
# Copyright 2020 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

export C_PREFIX="riscv32-unknown-elf-"
export IREE_PREFIX="riscv32-unknown-elf-"
export IREE_ARCH="rv32imf"
export RUST_PREFIX="riscv32-unknown-linux-gnu"

# NB: $(CANTRIP_SRC_DIR)/apps/system/rust.cmake forces riscv32imac for
#     the target when building Rust code
export CANTRIP_TARGET_ARCH="riscv32-unknown-elf"

# Shodan's toolchains are setup specially, just setup the environment.
export RUSTDIR="${CACHE}/rust_toolchain"
export CARGO_HOME="${RUSTDIR}"
export RUSTUP_HOME="${RUSTDIR}"
export PATH="${RUSTDIR}/bin:${PATH}"

export OPENTITAN_GEN_DIR="${CANTRIP_OUT_DIR}/opentitan-gen/include/opentitan"
export OPENTITAN_SOURCE="${ROOTDIR}/hw/opentitan-upstream"

# Some build.rs files use the regtool crate which needs to know where to find
# regtool.py.
export REGTOOL="${OPENTITAN_SOURCE}/util/regtool.py"
# The following files are the input to regtool.py
export I2S_HJSON="${ROOTDIR}/hw/matcha/hw/top_matcha/ip/i2s/data/i2s.hjson"
export MBOX_HJSON="${ROOTDIR}/hw/matcha/hw/top_matcha/ip/tlul_mailbox/data/tlul_mailbox.hjson"
export ML_TOP_HJSON="${ROOTDIR}/hw/matcha/hw/top_matcha/ip/ml_top/data/ml_top.hjson"
export TIMER_HJSON="${OPENTITAN_GEN_DIR}/rv_timer.hjson"
export UART_HJSON="${OPENTITAN_SOURCE}/hw/ip/uart/data/uart.hjson"
export VC_TOP_HJSON="${ROOTDIR}/hw/matcha/hw/top_matcha/ip/vc_top/data/vc_top.hjson"
# Input for topgen_matcha.py to generate hw configuration
export TOP_MATCHA_HJSON="${ROOTDIR}/hw/matcha/hw/top_matcha/data/top_matcha.hjson"

# Standard locations of Nexus configs and binaries
export OT_TOOL="${ROOTDIR}/out/opentitantool"
export NEXUS_JSON="${ROOTDIR}/out/nexus.json"
export NEXUS_SPI_PASSTHRU="${ROOTDIR}/out/spi_passthrough_fpga_nexus.bin"

function parting_messages() {
    if [[ ! -d "${RUSTDIR}" ]] ||
       [[ ! -d "${ROOTDIR}/cache/toolchain" ]] ||
       [[ ! -d "${ROOTDIR}/cache/toolchain_iree_rv32imf" ]] ||
       [[ ! -d "${ROOTDIR}/cache/renode" ]]; then
        echo
        echo '!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!'
        echo You have missing tools. Please run \'m prereqs\' followed
        echo by \'m tools\' to install them.
        echo '!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!'
        echo
        [[ -d "${RUSTDIR}" ]] || echo "${RUSTDIR} is missing!"
        [[ -d "${ROOTDIR}/cache/toolchain" ]] || echo "${ROOTDIR}/cache/toolchain is missing"
        [[ -d "${ROOTDIR}/cache/toolchain_iree_rv32imf" ]] || echo "${ROOTDIR}/cache/toolchain_iree_rv32imf is missing!"
        [[ -d "${ROOTDIR}/cache/renode" ]] || echo "${ROOTDIR}/cache/renode is missing!"
    fi
    echo Run \'set-nexus-id NN\' to set your Nexus board ID
}

function sim_kelvin
{
    # Run the ELF/Bin program with kelvin_sim
    local bin_file="$(realpath $1)"
    local magic_bytes="$(xxd -p -l 4 ${bin_file})"
    local -a flags=()
    local is_elf=false
    if [[ ${magic_bytes} == "7f454c46" ]]; then
      is_elf=true
    else
      flags+=("--entry_point 0 ")
    fi

    if [[ "$2" == "debug" ]]; then
        flags+=("-i")
        if [[ "${is_elf}" == false ]]; then
            echo "debug mode only works on ELF files"
            return 1
        fi
    fi

    ("${OUT}/kelvin/sim/kelvin_sim" "${bin_file}" ${flags[@]})
}

function sim_kelvin_renode
{
    # Run the Bin program with renode
    local bin_file="$(realpath $1)"
    local command="start;"

    (cd "${ROOTDIR}" && renode -e "\$bin=@${bin_file}; i @sim/config/kelvin.resc; \
        ${command} sysbus.ml_top_controlblock WriteDoubleWord 0xc 0" \
        --disable-xwt --console)

}

function set-nexus-id
{
    local nexus_id="${1}"; shift

    if [[ -z "${nexus_id}" ]]; then
        (
            echo "Usage: set-nexus-id <NN>"
            echo
            echo "Sets the target Nexus board to run on.  Must be a two digit number"
            echo
        ) | fmt
        return 1
    fi
    if [[ "${#nexus_id}" -ne 2 ]]; then
        echo "Nexus number must be two digits"
        return 1
    fi

    export NEXUS_ID="${nexus_id}"
    # TODO(b/316200811) track down all the places we use a different variable name:
    export NEXUS_BOARD="${nexus_id}"
    export FPGA_BOARD_ID="${nexus_id}"
}

function opentitantool
{
    # Run built opentitantool with standard flags
    if [[ -z "${NEXUS_ID}" ]]; then
        echo "Run set-nexus-id first"
        return 1
    fi

    "${OT_TOOL}" --conf "${NEXUS_JSON}" --interface nexus --usb-serial \
        "Nexus-FTDI-${NEXUS_ID}" "$@"
}

function nexus_reset
{
    # Reset nexus board
    if [[ -z "${NEXUS_ID}" ]]; then
        echo "Run set-nexus-id first"
        return 1
    fi

    echo "Resetting nexus-${NEXUS_ID}"
    opentitantool gpio write RESET true
    opentitantool gpio write RESET false
    opentitantool gpio write RESET true
}

function nexus_flash
{
    # Write tar file to nexus SPI flash and verify

    local flash_tar="$(realpath $1)"
    if [[ -z "${flash_tar}" ]]; then
        (
            echo "Usage: nexus_flash path/to/file.tar"
            echo
            echo "Writes tar file to Nexus SPI flash for booting."
            echo
        ) | fmt
        return 1
    fi

    if [[ -z "${NEXUS_ID}" ]]; then
        echo "Run set-nexus-id first"
        return 1
    fi

    if [[ ! -f "${NEXUS_SPI_PASSTHRU}" ]]; then
        echo "INFO: spi_passthrough binary not found at ${NEXUS_SPI_PASSTHRU}"
        echo "running `m spi_passthrough` to build it"
        m spi_passthrough
        if [[ "$?" -ne 0 ]]; then
            echo "ERROR: Unable to find or build spi_passthrough!"
            return 1
        fi
    fi

    nexus_reset

    local read_size="$(du -b ${flash_tar} | awk '{print $1}')"
    local erase_size="$(du -b ${flash_tar} \
        | awk '{ print $1 + (n - $1 % n) % n }' n=262144)"

    echo "Program SPI using ${NEXUS_SPI_PASSTHRU} on nexus-${NEXUS_ID}"
    opentitantool bootstrap "${NEXUS_SPI_PASSTHRU}"
    opentitantool spi block-erase --start 0 --length "${erase_size}"
    opentitantool spi program --start 0 "${flash_tar}"

    local readback_file="$(mktemp -d)/$(basename ${flash_tar}).readback"
    opentitantool  spi read --start 0 --length "${read_size}" "${readback_file}"
    diff "${flash_tar}" "${readback_file}"
    if [[ "$?" -ne 0 ]]; then
        echo "ERROR: Nexus flash verify failed!"
        return 1
    fi
    rm "${readback_file}"

    nexus_reset
}

function nexus_clear_flash
{
    # Clear the first page of the SPI flash to prevent restarting from the
    # loaded program at the next reset.
    if [[ -z "${NEXUS_ID}" ]]; then
        echo "Run set-nexus-id first"
        return 1
    fi

    echo "Clearing nexus-${NEXUS_ID} SPI flash"
    nexus_reset
    opentitantool bootstrap "${NEXUS_SPI_PASSTHRU}"
    opentitantool spi block-erase --start 0 --length 262144
}

function nexus_mcu_write() {
    # Send command to the Nexus MCU REPL
    if [[ -z "${NEXUS_ID}" ]]; then
        echo "Run set-nexus-id first"
        return 1
    fi

    echo "Sending nexus-${NEXUS_ID} MCU the command: $@"
    nexus_mcu.py --nexus_id=${NEXUS_ID} "$@"
}

function nexus_load_bitstream
{
    # Load bitstream file onto Nexus FPGA
    local bitstream_path="$(realpath $1)"
    if [[ -z "${bitstream_path}" ]]; then
        (
            echo "WARNING: No bitstream specified. Loading default bitstream"
            echo "from \$OUT/hw/bitstream/vivado/fpga_nexus_mask_test_rom.bit"
        ) | fmt
        bitstream_path="${OUT}/hw/bitstream/vivado/fpga_nexus_mask_test_rom.bit"
    fi

    if [[ -z "${NEXUS_ID}" ]]; then
        echo "Run set-nexus-id first"
        return 1
    fi

    if [[ ! -f "${bitstream_path}" ]]; then
        echo "ERROR: bitstream not found at ${bitstream_path}"
        return 1
    fi

    echo "Pushing ${bitstream_path} to nexus-${NEXUS_ID}"
    # Issue a no-op command to flush the character buffer in case it isn't empty
    nexus_mcu_write "help"
    scp "${bitstream_path}" "root@nexus${NEXUS_ID}:/mnt/mmcp1/"
    nexus_mcu_write "camera_powerdown"
    sleep 5
    local bitstream_name="$(basename ${bitstream_path})"
    ssh "root@nexus${NEXUS_ID}" "/mnt/mmcp1/zturn -d a /mnt/mmcp1/${bitstream_name}"
    nexus_mcu_write "camera_powerup"
}

function nexus_boot
{
    # Boot the Nexus board.  If flashed, will boot from flash
    # This command is a synomym for `opentitantool boot`
    echo "Booting Nexus-${NEXUS_ID}"
    opentitantool boot
}

function nexus_bootstrap
{
    # Bootstrap a binary on the Nexus board

    local binary="$(realpath $1)"
    if [[ -z "${binary}" ]]; then
        (
            echo "Usage: nexus_flash path/to/file.bin"
            echo
            echo "Run a binary on the nexus board."
            echo
        ) | fmt
        return 1
    fi
    echo "Bootstrapping ${binary} onto Nexus-${NEXUS_ID}"
    opentitantool bootstrap "${binary}"
}