#!/usr/bin/env bash

# Copyright (c) 2019, University of Kaiserslautern
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# 1. Redistributions of source code must retain the above copyright notice,
#    this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its
#    contributors may be used to endorse or promote products derived from
#    this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER
# OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# Author: Éder F. Zulian

DIR="$(cd "$(dirname "$0")" && pwd)"
TOPDIR=$DIR/../..
source $TOPDIR/common/defaults.in
source $TOPDIR/common/util.in
currtime=$(date "+%Y.%m.%d-%H.%M.%S")

# This example uses a fork of the main gem5 repository
gem5_dir="$GEM5FORKS/gem5"
# It also uses an specific branch with a patch created by the UC Davis
# Computer Architecture Research Group originally in
# https://github.com/darchr/gem5.
git_branch="for-upstream/real-kvm-fixes"

gitrepos=(
"$GEM5FORKS:https://github.com/darchr/gem5.git"
)
git_clone_into_dir gitrepos[@]

arch="X86"
mode="opt"
gem5_elf="build/$arch/gem5.$mode"


pushd ${gem5_dir}
if [[ ! -e $gem5_elf ]]; then
	git clean -fdx
	git checkout ${git_branch}
	build_gem5 $arch $mode
fi
popd

sys='x86-system'
tarball="${sys}.tar.bz2"
wgethis=("$FSDIRX86:http://www.m5sim.org/dist/current/x86/$tarball")
wget_into_dir wgethis[@]

pushd ${FSDIRX86}
if [[ ! -d ${sys} ]]; then
	mkdir -p ${sys}
	tar -xaf ${tarball} -C ${sys}
fi
popd

syspath="$FSDIRX86/${sys}"
diskpath="${syspath}/disks"

disk="${diskpath}/linux-x86.img"
kernel="${syspath}/binaries/x86_64-vmlinux-2.6.22.9"

cfgscript="configs/example/fs.py"
disk_opt="--disk-image=${disk}"
kernel_opt="--kernel=${kernel}"

cpu_opt="--cpu-type=X86KvmCPU"

pushd ${gem5_dir}
git checkout configs/common/FSConfig.py
git apply $DIR/boot-linux.patch
output_dir="x86_linux_$currtime"
mkdir -p ${output_dir}
logfile=${output_dir}/gem5.log
export M5_PATH="${syspath}":${M5_PATH}
$gem5_elf -d $output_dir $cfgscript $cpu_opt $kernel_opt $disk_opt 2>&1 | tee $logfile
popd

