#!/usr/bin/env sh

#  helper script: create ROM images for a given mainboard
#
#	Copyright (C) 2020,2021,2023 Leah Rowe <info@minifree.org>
#	Copyright (C) 2021,2022 Ferass El Hafidi
#				<vitali64pmemail@protonmail.com>
#	Copyright (C) 2022 Caleb La Grange <thonkpeasant@protonmail.com>
#	Copyright (C) 2022 Alper Nebi Yasak <alpernebiyasak@gmail.com>
#	Copyright (C) 2023 Riku Viitanen <riku.viitanen@protonmail.com>
#
#	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

. "include/err.sh"

read projectname < projectname

cfgsdir="config/coreboot"

blobs_required=""

board=""
ubdir=""
kmapdir="config/grub/keymap"
displaymodes=""
payloads=""
keyboard_layouts=""

grub_scan_disk="undefined"
tree="undefined"
arch="undefined"

# Disable all payloads by default.
# target.cfg files have to specifically enable [a] payload(s)
payload_grub="n"
payload_grub_withseabios="n" # seabios chainloaded from grub
payload_seabios="n"
payload_seabios_withgrub="n" # i386-coreboot grub from SeaBIOS boot menu
payload_memtest="n"
payload_uboot="n"
uboot_config="undefined"

romdir=""
cbdir=""
cbfstool=""
corebootrom=""
seavgabiosrom="elf/seabios/default/libgfxinit/vgabios.bin"

initmode=""
displaymode=""
cbcfg=""
targetdir=""

grubelf="elf/grub/grub.elf"

main()
{
	while [ $# -gt 0 ]; do
		case ${1} in
		-d)
			displaymodes="${displaymodes}${2}"
			shift ;;
		-p)
			payloads="${payloads}${2}"
			shift ;;
		-k)
			keyboard_layouts="${keyboard_layouts}${2}"
			shift ;;
		*)
			board=${1} ;;
		esac
		shift
	done

	printf "\n\nboard %s, kb %s, displaymode %s, payloads %s\n" \
	    "${board}" "${keyboard_layouts}" "${displaymodes}" "${payloads}"

	configure_target
	build_dependencies

	build_target
}

configure_target()
{
	targetdir="${cfgsdir}/${board}"

	[ -d "${targetdir}" ] || \
		err "Target not defined: ${board}"

	[ -f "${targetdir}/target.cfg" ] || \
		err "Missing target.cfg for target: ${board}"

	# Override the above defaults using target.cfg
	. "${targetdir}/target.cfg"

	[ "${grub_scan_disk}" = "undefined" ] && \
		grub_scan_disk="both"
	[ "${grub_scan_disk}" != "both" ] && \
	    [ "${grub_scan_disk}" != "ata" ] && \
	    [ "${grub_scan_disk}" != "ahci" ] && \
		grub_scan_disk="both"

	[ "${tree}" = "undefined" ] && \
		err "Target '${board}' defines no tree. Skipping build."
	[ "${arch}" = "undefined" ] && \
		err "Target '${board}' defines no arch. Skipping build."

	[ "${payload_memtest}" != "y" ] && \
		payload_memtest="n"
	[ "${payload_grub_withseabios}" = "y" ] && \
		payload_grub="y"
	if [ "${payload_grub_withseabios}" = "y" ]; then
		payload_seabios="y"
		payload_seabios_withgrub="y"
	fi
	[ "${payload_seabios_withgrub}" = "y" ] && \
		payload_seabios="y"

	# The reverse logic must not be applied. If SeaBIOS-with-GRUB works,
	# that doesn't mean GRUB-withSeaBIOS will. For example, the board
	# might have a graphics card whose vga rom coreboot doesn't execute
	if [ "${payload_grub}" != "y" ] && \
	    [ "${payload_seabios}" != "y" ] && \
	    [ "${payload_uboot}" != "y" ]; then
		for configfile in "${targetdir}/config/"*; do
			[ -e "${configfile}" ] || continue
			err "target '${board}' defines no payload"
		done
	fi

	[ "${payload_uboot}" != "n" ] && [ "${payload_uboot}" != "y" ] && \
		payload_uboot="n"
	[ "${payload_uboot}" = "y" ] && [ "${uboot_config}" = "undefined" ] && \
		uboot_config="default"

	[ "${blobs_required}" != "n" ] && [ "${blobs_required}" != "y" ] && \
		blobs_required="y"

	# Override all payload directives with cmdline args
	if [ ! -z ${payloads} ]; then
		echo "setting payloads $payloads"
		payload_grub="n"
		payload_grub_withseabios="n" # seabios chainloaded from grub
		payload_seabios="n"
		payload_seabios_withgrub="n" # i386-coreboot grub from SeaBIOS
		payload_uboot="n"
		payload_memtest="n"

		for payload in ${payloads} ; do
			eval "payload_${payload}=y"
		done
	fi
}

build_dependencies()
{
	romdir="bin/${board}"
	cbdir="coreboot/${board}"
	[ "${board}" = "${tree}" ] || \
		cbdir="coreboot/${tree}"
	cbfstool="cbutils/${tree}/cbfstool"
	corebootrom="${cbdir}/build/coreboot.rom"

	./build coreboot utils ${tree} || err "cannot build cbutils/${tree}"

	build_dependency_seabios

	memtest_bin="memtest86plus/build${arch#*_}/memtest.bin"
	[ "${payload_memtest}" != "y" ] || [ -f "${memtest_bin}" ] || \
		./handle make file -b ${memtest_bin%/*} || \
		    err "cannot build memtest86+"

	[ -d "${romdir}/" ] || mkdir -p "${romdir}/" || \
	    err "cannot create rom directory: \"${romdir}\""
	rm -f "${romdir}"/* || err "cannot: rm -f \"${romdir}\"/*"

	build_dependency_grub
	build_dependency_uboot
}

build_dependency_seabios()
{
	[ "${payload_seabios}" = "y" ] || return 0

	if [ ! -f "${seavgabiosrom}" ] \
	    || [ ! -f elf/seabios/default/libgfxinit/bios.bin.elf ] \
	    || [ ! -f elf/seabios/default/vgarom/bios.bin.elf ] \
	    || [ ! -f elf/seabios/default/normal/bios.bin.elf ]; then
		./handle make config -b seabios || \
		    err "cannot build seabios"
	fi
}

build_dependency_grub()
{
	[ "${payload_grub}" != "y" ] && \
	    [ "${payload_seabios_withgrub}" != "y" ] && return 0

	rebuild_grub="n"
	[ ! -f "${grubelf}" ] && rebuild_grub="y"
	for keymapfile in "${kmapdir}"/*.gkb; do
		[ "${rebuild_grub}" = "y" ] || break
		[ -f "${keymapfile}" ] || continue

		keymap="${keymapfile##*/}"
		keymap="${keymap%.gkb}"
		[ ! -f "elf/grub/keymap_${keymap}.cfg" ] && \
		    rebuild_grub="y" && break
	done
	if [ "${rebuild_grub}" = "y" ]; then
		./build grub payload || \
		    err "build_dependency_grub: cannot build grub payload"
	fi
}

build_dependency_uboot()
{
	[ "${payload_uboot}" = "y" ] || return 0

	./handle make config -b u-boot ${board} || \
	    err "cannot build u-boot target: ${board}"
	ubdir="elf/u-boot/${board}/${uboot_config}"
	ubootelf="${ubdir}/u-boot.elf"
	[ ! -f "${ubootelf}" ] && [ -f "${ubdir}/u-boot.bin" ] && \
		ubootelf="${ubdir}/u-boot.bin"
	if [ ! -f "${ubootelf}" ]; then
		err "Could not find u-boot build for board, ${board}"
	fi
}

build_target()
{
	for x in "normal" "vgarom" "libgfxinit"; do
		initmode="${x}"
		hmode="vesafb"
		[ "${initmode}" = "vgarom" ] || hmode="corebootfb"
		modes="${hmode} txtmode"
		[ -z ${displaymodes} ] || modes="${displaymodes}"
		for y in ${modes}; do
			displaymode="${y}"
			[ "${initmode}" = "normal" ] && \
			    [ "$displaymode" != "txtmode" ] && continue
			cbcfg="${targetdir}/config/${initmode}_${displaymode}"
			[ "${initmode}" = "normal" ] && cbcfg="${cbcfg%_*}"
			build_roms "${cbcfg}" "${displaymode}" "${initmode}"
		done
	done
}

# Main ROM building function. This calls all other functions below
build_roms()
{
	cbcfg="${1}"
	displaymode="${2}"
	initmode="${3}"

	[ ! -f "${cbcfg}" ] && \
		printf "'%s' does not exist. Skipping build for %s %s %s\n" \
		    "${cbcfg}" "${board}" "${displaymode}" "${initmode}" \
		    1>&2 && return 0

	./handle make config -b coreboot ${board} || \
	    err "build_roms: cannot build coreboot for target: ${board}"

	_corebootrom="elf/coreboot/${board}/${initmode}_${displaymode}"
	[ "${initmode}" = "normal" ] && \
		_corebootrom="${_corebootrom%_${displaymode}}"
	_corebootrom="${_corebootrom}/coreboot.rom"
	corebootrom="$(mktemp -t coreboot_rom.XXXXXXXXXX)"
	cp "${_corebootrom}" "${corebootrom}" || \
	    err "build_roms: cannot copy rom"

	[ "${payload_memtest}" != "y" ] || \
		"${cbfstool}" "${corebootrom}" add-payload \
		    -f "${memtest_bin}" -n img/memtest -c lzma || \
		    err "build_roms: cannot add img/memtest to coreboot rom"

	[ "${payload_seabios}" = "y" ] && \
		build_seabios_roms

	[ "${payload_grub}" != "y" ] || \
		build_grub_roms "${corebootrom}" "${initmode}" \
		    "${displaymode}" "grub" || \
		    err "build_roms: build_grub_roms failed"

	if [ "${payload_uboot}" = "y" ]; then
		build_uboot_roms
	fi
}

build_seabios_roms()
{
	if [ "${payload_seabios_withgrub}" = "y" ]; then
		tmprom=$(mktemp -t coreboot_rom.XXXXXXXXXX)
		cp "${corebootrom}" "${tmprom}" || \
		    err "build_seabios_roms: cannot copy to tmprom"
		build_grub_roms "${tmprom}" "${initmode}" \
		    "${displaymode}" "seabios_withgrub" || \
		    err "build_roms: cannot build grub roms, seabios w/grub"
		rm -f "${tmprom}" || err "build_roms: can't remove tmprom"
	else
		x=${corebootrom}
		y=${initmode}
		t=$(mkSeabiosRom "$x" "fallback/payload" "$y")
		if [ "${initmode}" = "normal" ]; then
			newrompath="${romdir}/seabios_${board}_"
			newrompath="${newrompath}${initmode}.rom"
		else
			newrompath="${romdir}/seabios_${board}_"
			newrompath="${newrompath}${initmode}_"
			newrompath="${newrompath}${displaymode}.rom"
		fi

		moverom "${t}" "${newrompath}" || \
		    err "build_roms: cannot copy rom"
		rm -f "${t}" || err "cannot rm ${t}"
	fi

}

# Make separate ROM images with GRUB payload, for each supported keymap
build_grub_roms() {
	tmprompath="${1}"
	initmode="${2}"
	displaymode="${3}"
	firstpayloadname="${4}" # allow values: grub, seabios, seabios_withgrub

	grubelf_cbfs="fallback/payload"

	x=${tmprompath}
	y=${initmode}
	if [ "${payload_grub_withseabios}" = "y" ] && \
	    [ "${firstpayloadname}" = "grub" ]; then
		mv "$(mkSeabiosRom "${x}" "seabios.elf" "${y}")" "${tmprompath}"
	elif [ "${payload_seabios_withgrub}" = "y" ] && \
	    [ "${firstpayloadname}" != "grub" ]; then
		mv "$(mkSeabiosRom "${x}" "fallback/payload" "$y")" \
		    "${tmprompath}" || \
		    err "build_grub_roms: cannot move SeaBIOS ROM to tmprom"
		grubelf_cbfs="img/grub2"
	fi

	# we only need insert grub.elf once, for each coreboot config:
	"${cbfstool}" "${tmprompath}" add-payload -f "${grubelf}" \
	    -n ${grubelf_cbfs} -c lzma || \
	    err "build_grub_roms: cannot add grub payload to tmprom"

	# we only need insert background.png once, for each coreboot config:
	if [ "${displaymode}" = "vesafb" ] || \
	    [ "${displaymode}" = "corebootfb" ]; then
		backgroundfile="background1280x800.png"
		if [ "${board}" = "x60" ] \
		    || [ "${board}" = "t60_intelgpu" ]; then
			# TODO: don't hardcode this. do it in target.cfg
			backgroundfile="background1024x768.png"
		fi
		backgroundfile="config/grub/background/${backgroundfile}"
		"${cbfstool}" "${tmprompath}" add -f ${backgroundfile} \
		    -n background.png -t raw || \
		    err "build_grub_roms: cannot add background.png to tmprom"

	fi

	tmpscancfg=$(mktemp -t coreboot_rom.XXXXXXXXXX) || 
	    err "mkGrubRom: cannot create temporary scan.cfg"
	printf "set grub_scan_disk=\"%s\"\n" "${grub_scan_disk}" > \
	    "${tmpscancfg}" || \
	    err "mkGrubRom: cannot insert into temporary scan.cfg"
	"${cbfstool}" "${tmprompath}" add -f "${tmpscancfg}" -n scan.cfg \
	    -t raw || err "mkGrubROM: cannot insert scan.cfg into CBFS"

	keymaps=""
	if [ -z ${keyboard_layouts} ]; then
		for kmapfile in "${kmapdir}"/*; do
			keymaps="${keymaps} ${kmapfile}"
		done
	else
		for keymapname in ${keyboard_layouts}; do
			keymaps="${keymaps} ${kmapdir}/${keymapname}.gkb"
		done
	fi
	for keymapfile in ${keymaps}; do
		echo "keymaps is $keymaps, keymapfile is $keymapfile"

		[ -f "${keymapfile}" ] || continue

		keymap="${keymapfile##*/}"
		keymap="${keymap%.gkb}"

		tmpgrubrom="$(mkGrubRom "${keymap}" "${tmprompath}")"

		if [ "${initmode}" = "normal" ]; then
			newrompath="${romdir}/${firstpayloadname}_${board}_"
			newrompath="${newrompath}${initmode}_${keymap}.rom"
		else
			newrompath="${romdir}/${firstpayloadname}_${board}_"
			newrompath="${newrompath}${initmode}_${displaymode}_"
			newrompath="${newrompath}${keymap}.rom"
		fi
		moverom "${tmpgrubrom}" "${newrompath}" || \
		    err "build_grub_roms, moverom"
		rm -f "${tmpgrubrom}" || err "rm tmpgrubrom, build_grub_roms"
	done
}

# make a rom in /tmp/ and then print the path of that ROM
mkGrubRom() {
	target_keymap="${1}"
	target_cbrom="${2}"

	keymapcfg="elf/grub/keymap_${target_keymap}.cfg"

	tmprom=$(mktemp -t coreboot_rom.XXXXXXXXXX) || \
	    err "mkGrubRom: cannot create tmprom"
	cp "${target_cbrom}" "${tmprom}" || \
	    err "mkGrubRom: cannot copy to tmprom"

	"${cbfstool}" "${tmprom}" add -f "${keymapcfg}" -n keymap.cfg -t raw \
	    || err "mkGrubRom: cannot add keymap.cfg to tmprom"

	printf "%s\n" "${tmprom}"
}

# make a rom in /tmp/ and then print the path of that ROM
mkSeabiosRom() {
	target_cbrom="${1}" # rom to insert seabios in. will not be touched
		# (a tmpfile will be made instead)
	target_seabios_cbfs_path="${2}" # e.g. fallback/payload
	target_initmode="${3}" # e.g. libgfxinit

	target_seabioself="elf/seabios/default/${target_initmode}/bios.bin.elf"

	tmprom=$(mktemp -t coreboot_rom.XXXXXXXXXX)

	cp "${target_cbrom}" "${tmprom}" || \
	    err "mkSeabiosRom: cannot copy to tmprom"

	"${cbfstool}" "${tmprom}" add-payload -f "${target_seabioself}" \
	    -n ${target_seabios_cbfs_path} -c lzma || \
	    err "mkSeabiosRom: can't add payload, ${target_seabioself}, to rom"

	"${cbfstool}" "${tmprom}" add-int -i 3000 -n etc/ps2-keyboard-spinup \
	    || err "mkSeabiosRom: cbfs add-int etc/ps2-keyboard-spinup 3000"

	if [ "${target_initmode}" = "normal" ] || \
	    [ "${target_initmode}" = "libgfxinit" ]; then
		"${cbfstool}" "${tmprom}" add-int -i 2 \
		    -n etc/pci-optionrom-exec || \
		    err "mkSeabiosRom: cbfs add-int etc/pci-optionrom-exec 2"
	elif [ "${target_initmode}" = "vgarom" ]; then # coreboot executes it
		"${cbfstool}" "${tmprom}" add-int -i 0 \
		    -n etc/pci-optionrom-exec || \
		    err "mkSeabiosRom: cbfs add-int etc/pci-optionrom-exec 0"
	fi # for undefined modes, don't add this integer. use SeaBIOS defaults

	"${cbfstool}" "${tmprom}" add-int -i 0 -n etc/optionroms-checksum || \
	    err "mkSeabiosRom: cbfs add-int etc/optionroms-checksum 0"

	[ "${target_initmode}" != "libgfxinit" ] || \
		"${cbfstool}" "${tmprom}" add -f "${seavgabiosrom}" \
		    -n vgaroms/seavgabios.bin -t raw || \
		    err "mkSeabiosRom: cbfs add-raw vgaroms/seavgabios.bin"

	printf "%s\n" "${tmprom}"
}

build_uboot_roms()
{
	x=${corebootrom}
	y=${uboot_config}
	z=${cbfstool}
	tmprom="$(mkUbootRom "$x" "fallback/payload" "$y" "$z")"
	newrompath="${romdir}/uboot_payload_${board}_${initmode}_${displaymode}.rom"
	[ "${initmode}" = "normal" ] && \
		newrompath="${romdir}/uboot_payload_${board}_${initmode}.rom"
	moverom "${tmprom}" "${newrompath}" || \
	    err "build_roms: moverom fail (u-boot)"
	rm -f "${tmprom}" || \
	    err "build_roms: cannot rm u-boot rom"
}

# make a rom in /tmp/ and then print the path of that ROM
mkUbootRom() {
	target_cbrom="${1}" # rom to insert u-boot in. it won't be touched
		# (a tmpfile will be made instead)
	target_uboot_cbfs_path="${2}" # e.g. fallback/payload
	target_uboot_config="${3}"
	cbfstool_path="${4}"

	target_ubdir="elf/u-boot/${board}/${target_uboot_config}"
	target_ubootelf="${target_ubdir}/u-boot.elf"
	[ -f "${target_ubootelf}" ] || \
		target_ubootelf="${target_ubdir}/u-boot.bin"
	[ -f "${target_ubootelf}" ] || \
		err "mkUbootRom: ${board}: cant find u-boot build"

	tmprom=$(mktemp -t coreboot_rom.XXXXXXXXXX)

	cp "${target_cbrom}" "${tmprom}" || \
	    err "mkUbootRom: cannot copy to tmprom"
	"${cbfstool}" "${tmprom}" add-payload -f "${target_ubootelf}" \
	    -n ${target_uboot_cbfs_path} -c lzma || \
	    err "mkUbootRom: cannot add u-boot to tmprom"

	printf "%s\n" "${tmprom}"
}

# it is assumed that no other work will be done on the ROM
# after calling this function. therefore this function is "final"
moverom() {
	rompath="${1}"
	newrompath="${2}"

	printf "\nCreating new ROM image: %s\n" "${newrompath}"

	[ "${blobs_required}" = "n" ] && \
		newrompath="${newrompath%.rom}_noblobs.rom"

	cp "${rompath}" "${newrompath}" || err "moverom: can't copy rom"
}

main $@