scripts/build-vexriscv

#!/bin/bash

# Copyright 2022 The ChromiumOS Authors.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Builds VexRiscv from source, putting the result in
# third_party/vexriscv_verilog. sbt needs to be installed.

set -e
PROJECT_ROOT=$(realpath "$(dirname "${BASH_SOURCE[0]}")"/..)

INSTALLED_DIR="${PROJECT_ROOT}/third_party/installed"

SBT_URL="https://github.com/sbt/sbt/releases/download/v1.6.2/sbt-1.6.2.tgz"
SBT_SHA256="637637b6c4e6fa04ab62cd364061e32b12480b09001cd23303df62b36fadd440"
SBT_DIR="${INSTALLED_DIR}/sbt"

if [ ! -d "${SBT_DIR}" ]; then
    echo "Installing SBT"
    cd "${INSTALLED_DIR}"
    wget "${SBT_URL}" -O sbt.tgz
    sha256sum --check <(echo "${SBT_SHA256}" sbt.tgz)
    tar xf sbt.tgz
    rm sbt.tgz
fi

BUILD_DIR="${PROJECT_ROOT}/build"
CFU_PLAYGROUND="${BUILD_DIR}/CFU-Playground"
DATA_VEXRISCV="${CFU_PLAYGROUND}/third_party/python/pythondata_cpu_vexriscv"

if [ ! -d "${CFU_PLAYGROUND}" ]; then
    cd "${BUILD_DIR}"
    git clone https://github.com/google/CFU-Playground.git
fi

cd "${CFU_PLAYGROUND}"
git checkout -q eda29975fbd57944b199cc778de25a4a54945f24
git submodule init third_party/python/pythondata_cpu_vexriscv
git submodule update third_party/python/pythondata_cpu_vexriscv

cd "${DATA_VEXRISCV}"
git submodule init
git submodule update

cd "${DATA_VEXRISCV}/pythondata_cpu_vexriscv/verilog/ext/VexRiscv"
# We want to use a specific commit of VexRiscv. The one currently used by
# pythondata_cpu_vexriscv is a little too old and doesn't include commit
# c242744d02b, which we need for correct operation.
git checkout -q 36f57d5eb7170b1f4e8b6c70b9e762c8cb7f9bf0

cd "${CFU_PLAYGROUND}/soc/vexriscv"
"${SBT_DIR}/bin/sbt" compile \
    "runMain vexriscv.GenCoreDefault \
    --dCacheSize 1024 \
    --iCacheSize 8192 \
    --relaxedPcCalculation true \
    --csrPluginConfig all \
    --cfu true \
    --outputFile ../../../../third_party/vexriscv/VexRiscv_SlimCfu"

# We don't need this file, so delete it.
rm "${PROJECT_ROOT}/third_party/vexriscv/VexRiscv_SlimCfu.yaml"