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#!/usr/bin/env bash

#  helper script: builds SeaBIOS source code
#
#	Copyright (C) 2020, 2021, 2023 Leah Rowe <info@minifree.org>
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU 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 General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

[ "x${DEBUG+set}" = 'xset' ] && set -v
set -u -e

payloaddir="payload/seabios"
seabios_elf="seabios/out/bios.bin.elf"
seavgabios="seabios/out/vgabios.bin"

main()
{
	printf "Building SeaBIOS payloads and SeaVGABIOS\n"

	check_dependencies
	build_seabios_payloads

	# clean it again. gotta keep it clean!
	[[ -f Makefile ]] && make -C seabios distclean

	printf "Done! SeaBIOS files are in %s/\n\n" ${payloaddir}
}

check_dependencies()
{
	if [ ! -d "${payloaddir}" ]; then
		mkdir -p ${payloaddir}/ || exit 1
	fi

	rm -f ${payloaddir}/* || exit 1

	if [ ! -d "seabios/" ]; then
	    ./download seabios || exit 1
	fi
}

build_seabios_payloads()
{
	for x in normal vgarom libgfxinit; do
		if [ ! -f seabios/Makefile ]; then
			printf "SeaBIOS not properly downloaded.\n"
			exit 1
		fi

		make distclean -BC seabios || exit 1

		cp "resources/seabios/config/${x}" seabios/.config
		make silentoldconfig -j$(nproc) -BC seabios || exit 1
		make -j$(nproc) -BC seabios || exit 1

		seabios_elf_dst="${payloaddir}/seabios_${x}.elf"
		cp ${seabios_elf} "${seabios_elf_dst}" || exit 1

		if [ "${x}" = "libgfxinit" ]; then
			cp ${seavgabios} ${payloaddir}/seavgabios.bin \
					|| exit 1
		fi
		rm -f seabios/.config || exit 1
	done
}

main $@