#!/usr/bin/env bash

#  helper script: create ROM images for a given mainboard
#
#	Copyright (C) 2020,2021 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/>.
#

# This script assumes that the working directory is the root
# of git or release archive

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

projectname="$(cat projectname)"

if (( $# != 1 )); then
	printf "Usage: ./build boot roms boardname\n"
	printf "Example: ./build boot roms x60\n"
	printf "Example: ./build boot roms x60 x200_8mb\n"
	printf "Example: ./build boot roms all\n"
	printf "You need to specify exactly 1 argument\n"
	exit 1
fi

board="${1}"

if [ ! -d "resources/coreboot/${board}" ]; then
	printf "build/roms: Target %s does not exist in the %s build system. Skipping build.\n" "${projectname}" "${board}"
	exit 1
fi

if [ ! -f "resources/coreboot/${board}/board.cfg" ]; then
	printf "build/roms: Target %s does not have a board.cfg. Skipping build.\n" "${board}"
	exit 1
fi

cbtree="undefined"
romtype="normal" # optional parameter in board.cfg. "normal" is default
arch="undefined"
# Disable all payloads by default.
# board.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 accessible from SeaBIOS boot menu
seabios_opromloadonly="0"
payload_memtest="n"
# Override the above defaults using board.cfg
source "resources/coreboot/${board}/board.cfg"
if [ "${cbtree}" = "undefined" ]; then
	printf "build/roms: Target %s does not define a coreboot tree. Skipping build.\n" "${board}"
	exit 1
fi
if [ "${arch}" = "undefined" ]; then
	printf "build/roms: Target %s does not define a CPU type. Skipping build.\n" "${board}"
	exit 1
fi

if [ "${seabios_opromloadonly}" != "0" ] && \
		[ "${seabios_opromloadonly}" != "1" ]; then
	seabios_opromloadonly="0"
fi
if [ "${payload_memtest}" != "n" ] && \
		[ "${payload_memtest}" != "y" ]; then
	payload_memtest="n"
fi
if [ "${payload_grub_withseabios}" = "y" ]; then
	payload_grub="y"
fi
if [ "${payload_grub_withseabios}" = "y" ]; then
	payload_seabios="y"
	payload_seabios_withgrub="y" # if grub-first works, then seabios-with-grub will also work
fi
if [ "${payload_seabios_withgrub}" = "y" ]; then
	payload_seabios="y" # if seabios-with-grub works, then SeaBIOS-alone should also work
fi
# NOTE: reverse logic must not be applied. If SeaBIOS-with-GRUB works, that doesn't
# necessarily mean GRUB-with-SeaBIOS will work nicely. for example, the board might
# only have an add-on GPU available, where it's recommended to boot SeaBIOS first
if [ "${payload_grub}" != "y" ] && [ "${payload_seabios}" != "y" ]; then
	while true; do
		for configfile in "resources/coreboot/${board}/config/"*; do
			if [ -f "${configfile}" ]; then
				printf "ERROR build/roms: Target '%s' does not define a payload. Exiting.\n" "${board}"
				exit 1
			fi
		done
		break
	done
fi

if [ "${payload_memtest}" = "y" ]; then
	if [ ! -f "memtest86plus/memtest" ]; then
		./build module memtest86plus
	fi
fi

romdir="bin/${board}"
cbdir="coreboot/${board}"
if [ "${board}" != "${cbtree}" ]; then
	cbdir="coreboot/${cbtree}"
fi
cbfstool="${cbdir}/util/cbfstool/cbfstool"
corebootrom="${cbdir}/build/coreboot.rom"
seavgabiosrom="payload/seabios/seavgabios.bin"

if [ ! -d "${cbdir}" ]; then
	./download coreboot ${cbtree}
fi

if [ "${arch}" = "x86_32" ] || [ "${arch}" = "x86_64" ]; then
	if [ ! -d "${cbdir}/util/crossgcc/xgcc/i386-elf/" ]; then
		(
			cat version > "${cbdir}/.coreboot-version"
			cd "${cbdir}"
			make crossgcc-i386 CPUS=$(nproc) # even for 64-bit machines, coreboot builds
				# 32-bit ROM images, so we only need to worry about i386-elf
		)
	fi
fi

if [ ! -f "${cbfstool}" ]; then
	./build module cbutils ${cbtree}
fi

if [ ! -f "${seavgabiosrom}" ] \
		|| [ ! -f payload/seabios/seabios_libgfxinit.elf ] \
		|| [ ! -f payload/seabios/seabios_vgarom.elf ]; then
	if [ "${payload_seabios}" = "y" ]; then
		./build payload seabios
	elif [ "${payload_grub}" = "y" ] \
			&& [ "${payload_grub_withseabios}" = "y" ]; then
		./build payload seabios
	fi
fi

[ -d "${romdir}/" ] || mkdir -p "${romdir}/"
rm -f "${romdir}"/*

if [ "${payload_grub}" = "y" ] || [ "${payload_seabios_withgrub}" = "y" ]; then
	if [ -f "payload/grub/grub_usqwerty.cfg" ]; then
		grubrefchecksum="$(sha1sum resources/grub/config/grub.cfg)"
		grubrefchecksum="${grubrefchecksum%  resources/grub/config/grub.cfg}"
		grubbuildchecksum="$(sha1sum payload/grub/grub_usqwerty.cfg)"
		grubbuildchecksum="${grubbuildchecksum%  payload/grub/grub_usqwerty.cfg}"
		if [ "${grubrefchecksum}" != "${grubbuildchecksum}" ]; then
			rm -Rf payload/grub/
			printf "Changes detected to GRUB. Re-building now:\n"
		fi
	else
		printf "Required GRUB payloads not yet built. Building now:\n"
		rm -Rf payload/grub/ # just in case
	fi
	for keymapfile in resources/grub/keymap/*; do

		if [ ! -f "${keymapfile}" ]; then
			continue
		fi

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

		grubelf="payload/grub/grub_${keymap}.elf"
		grubcfg="payload/grub/grub_${keymap}.cfg"
		grubtestcfg="payload/grub/grub_${keymap}_test.cfg"

		if [ ! -f "${grubelf}" ] || [ ! -f "${grubcfg}" ] || \
				[ ! -f "${grubtestcfg}" ]; then
			./build payload grub
		fi
	done
fi

# 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"
	cuttype="$3"

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

	if [ "${cuttype}" = "4MiB IFD BIOS region" ]; then
		dd if=${rompath} of=${newrompath} bs=1 skip=$[$(stat -c %s ${rompath}) - 0x400000] count=4194304
	else
		cp ${rompath} ${newrompath}
	fi

	# pike2008 cards cause a system hang when loading the option rom in seabios
	# if there is an empty option rom in cbfs, no option rom will be loaded
	if [ "${cuttype}" = "d8d16sas" ]; then
		emptyrom=$(mktemp -t coreboot_rom.XXXXXXXXXX)
		rm -f "${emptyrom}"
		touch "${emptyrom}"
		for deviceID in "0072" "3050"; do
			"${cbfstool}" "${newrompath}" add -f "${emptyrom}" -n pci1000,${deviceID}.rom -t raw
		done
		rm -f "${emptyrom}"
	fi

	for romsize in 4 8 16; do
		if [ "${cuttype}" = "${romsize}MiB ICH9 IFD NOR flash" ]; then
			if [ ! -f "descriptors/ich9m/ich9fdgbe_${romsize}m.bin" ]; then
				./build descriptors ich9m
			fi
			dd if=descriptors/ich9m/ich9fdgbe_${romsize}m.bin of=${newrompath} bs=1 count=12k conv=notrunc
		fi
		if [ "${cuttype}" = "${romsize}MiB ICH9 IFD NOGBE NOR flash" ]; then
			if [ ! -f "descriptors/ich9m/ich9fdnogbe_${romsize}m.bin" ]; then
				./build descriptors ich9m
			fi
			dd if=descriptors/ich9m/ich9fdnogbe_${romsize}m.bin of=${newrompath} bs=1 count=4k conv=notrunc
		fi
	done

	if [ "${cuttype}" = "i945 laptop" ]; then
		dd if=${newrompath} of=top64k.bin bs=1 skip=$[$(stat -c %s ${newrompath}) - 0x10000] count=64k
		dd if=top64k.bin of=${newrompath} bs=1 seek=$[$(stat -c %s ${newrompath}) - 0x20000] count=64k conv=notrunc
		rm -f top64k.bin
	fi
}

# expected: configs must not specify a payload
mkCoreboot() {
	cbdir="${1}" # e.g. coreboot/default
	cbcfgpath="${2}" # e.g. resources/coreboot/x200_8mb/config/libgfxinit_txtmode
	if [ ! -f "${cbcfgpath}" ]; then
		printf "\nmkCoreboot: Coreboot config '%s' does not exist. Skipping build.\n" \
			"${cbcfgpath}"
		return 0
	fi
	printf "%s-%s\n" "$(cat projectname)" "$(cat version)" > "${cbdir}/.coreboot-version"
	(
		cd "${cbdir}"
		make distclean		
	)
	cp "${cbcfgpath}" "${cbdir}"/.config
	(
		cd "${cbdir}"
		make -j$(nproc)
	)
}

# make a rom in /tmp/ and then print the path of that ROM
make_seabios_rom() {
	target_cbrom="${1}" # rom to insert seabios in. this rom won't be touched
		# a tmpfile will be made instead
	target_seabios_cbfs_path="${2}" # e.g. fallback/payload
	target_opromloadonly="${3}" # 0 or 1. if 1, only load but don't execute oproms
	target_initmode="${4}" # e.g. libgfxinit
	cbfstool_path="${5}"

	if [ "${target_initmode}" = "normal" ]; then
		target_seabioself="payload/seabios/seabios_vgarom.elf"
		# if normal, etc/pci-optionrom-exec will be set to 2
	else
		target_seabioself="payload/seabios/seabios_${target_initmode}.elf"
		# if libgfxinit, etc/pci-optionrom-exec will be set to 2
		# if vgarom, etc/pci-optionrom-exec will be set to 0
	fi
	target_seavgabios_rom="payload/seabios/seavgabios.bin"

	tmprom=$(mktemp -t coreboot_rom.XXXXXXXXXX)

	cp "${target_cbrom}" "${tmprom}"
	"${cbfstool}" "${tmprom}" add-payload -f "${target_seabioself}" -n ${target_seabios_cbfs_path} -c lzma
	"${cbfstool}" "${tmprom}" add-int -i 3000 -n etc/ps2-keyboard-spinup
	if [ "${target_initmode}" = "normal" ] || [ "${target_initmode}" = "libgfxinit" ]; then
		"${cbfstool}" "${tmprom}" add-int -i 2 -n etc/pci-optionrom-exec
	elif [ "${target_initmode}" = "vgarom" ]; then
		"${cbfstool}" "${tmprom}" add-int -i 0 -n etc/pci-optionrom-exec
	fi # for undefined modes, don't add this integer. rely on SeaBIOS defaults
	"${cbfstool}" "${tmprom}" add-int -i 0 -n etc/optionroms-checksum
	"${cbfstool}" "${tmprom}" add-int -i ${target_opromloadonly} -n etc/only-load-option-roms

	if [ "${target_initmode}" = "libgfxinit" ]; then
		"${cbfstool_path}" "${tmprom}" add -f "${target_seavgabios_rom}" -n vgaroms/seavgabios.bin -t raw
	fi

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

# make a rom in /tmp/ and then print the path of that ROM
make_grubrom_from_keymap() {
	target_keymap="${1}"
	target_cbrom="${2}"
	cbfstool_path="${3}"
	target_grubelf_cbfs_path="${4}" # e.g. fallback/payload

	grubelf="payload/grub/grub_${target_keymap}.elf"
	grubcfg="payload/grub/grub_${target_keymap}.cfg"
	grubtestcfg="payload/grub/grub_${target_keymap}_test.cfg"

	tmprom=$(mktemp -t coreboot_rom.XXXXXXXXXX)
	cp "${target_cbrom}" "${tmprom}"

	"${cbfstool_path}" "${tmprom}" add-payload -f "${grubelf}" -n ${target_grubelf_cbfs_path} -c lzma
	"${cbfstool_path}" "${tmprom}" add -f "${grubcfg}" -n grub.cfg -t raw
	"${cbfstool_path}" "${tmprom}" add -f "${grubtestcfg}" -n grubtest.cfg -t raw

	backgroundfile="background1280x800.png"
	if [ "${board}" = "x60" ] || [ "${board}" = "t60_intelgpu" ]; then
		# TODO: don't hardcode this check. do it in board.cfg per board
		backgroundfile="background1024x768.png"
	fi
	backgroundfile="resources/grub/background/${backgroundfile}"
	"${cbfstool_path}" "${tmprom}" add -f ${backgroundfile} -n background.png -t raw

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

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

	if [ "${payload_grub_withseabios}" = "y" ] && [ "${firstpayloadname}" = "grub" ]; then
		mv "$(make_seabios_rom "${tmprompath}" "seabios.elf" "${seabios_opromloadonly}" "${initmode}" "${cbfstool}")" "${tmprompath}"
	elif [ "${payload_seabios_withgrub}" ] && [ "${firstpayloadname}" != "grub" ]; then
		mv "$(make_seabios_rom "${tmprompath}" "fallback/payload" "${seabios_opromloadonly}" "${initmode}" "${cbfstool}")" "${tmprompath}"
		if [ "${firstpayloadname}" = "seabios_grubfirst" ]; then
			tmpbootorder=$(mktemp -t coreboot_rom.XXXXXXXXXX)
			printf "/rom@img/grub2\n" > "${tmpbootorder}"
			"${cbfstool}" "${tmprompath}" add -f "${tmpbootorder}" -n bootorder -t raw
			rm -f "${tmpbootorder}"
			"${cbfstool}" "${tmprompath}" add-int -i 0 -n etc/show-boot-menu
		fi
	fi

	for keymapfile in resources/grub/keymap/*; do

		if [ ! -f "${keymapfile}" ]; then
			continue
		fi

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

		grub_path_in_cbfs="fallback/payload"
		if [ "${firstpayloadname}" != "grub" ]; then
			grub_path_in_cbfs="img/grub2"
		fi

		tmpgrubrom="$(make_grubrom_from_keymap "${keymap}" "${tmprompath}" "${cbfstool}" "${grub_path_in_cbfs}")"
		if [ "${initmode}" = "normal" ]; then
			newrompath="${romdir}/${firstpayloadname}_${board}_${initmode}_${keymap}.rom"
		else
			newrompath="${romdir}/${firstpayloadname}_${board}_${initmode}_${displaymode}_${keymap}.rom"
		fi
		moverom "${tmpgrubrom}" "${newrompath}" "${romtype}"
		rm -f "${tmpgrubrom}"
	done
}

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

	if [ ! -f "${cbcfgpath}" ]; then
		printf "'%s' does not exist. Skipping build for %s %s %s\n" \
			"${cbcfgpath}" "${board}" "${displaymode}" "${initmode}"
		return 0
	fi

	mkCoreboot "${cbdir}" "${cbcfgpath}"

	if [ "${displaymode}" = "txtmode" ] && [ "${payload_memtest}" = "y" ]; then
		"${cbfstool}" "${corebootrom}" add-payload -f memtest86plus/memtest -n img/memtest -c lzma
	fi

	if [ "${payload_seabios}" = "y" ]; then
		if [ "${payload_seabios_withgrub}" = "n" ]; then
			tmpseabiosrom="$(make_seabios_rom "${corebootrom}" "fallback/payload" "${seabios_opromloadonly}" "${initmode}" "${cbfstool}")"
			if [ "${initmode}" = "normal" ]; then
				newrompath="${romdir}/seabios_${board}_${initmode}.rom"
			else
				newrompath="${romdir}/seabios_${board}_${initmode}_${displaymode}.rom"
			fi

			moverom "${tmpseabiosrom}" "${newrompath}" "${romtype}"
			rm -f "${tmpseabiosrom}"
		else
			tmprom=$(mktemp -t coreboot_rom.XXXXXXXXXX)
			cp "${corebootrom}" "${tmprom}"
			mkRomsWithGrub "${tmprom}" "${initmode}" "${displaymode}" "seabios_withgrub"
			cp "${corebootrom}" "${tmprom}"
			mkRomsWithGrub "${tmprom}" "${initmode}" "${displaymode}" "seabios_grubfirst"
			rm -f "${tmprom}"
		fi
	fi

	if [ "${payload_grub}" = "y" ]; then
		mkRomsWithGrub "${corebootrom}" "${initmode}" "${displaymode}" "grub"
	fi
}

initmode="libgfxinit"
for displaymode in corebootfb txtmode; do
	cbcfgpath="resources/coreboot/${board}/config/${initmode}_${displaymode}"
	mkRoms "${cbcfgpath}" "${displaymode}" "${initmode}"
done

initmode="vgarom"
for displaymode in vesafb txtmode; do	
	cbcfgpath="resources/coreboot/${board}/config/${initmode}_${displaymode}"
	mkRoms "${cbcfgpath}" "${displaymode}" "${initmode}"
done

initmode="normal"
displaymode="txtmode"
cbcfgpath="resources/coreboot/${board}/config/${initmode}"
mkRoms "${cbcfgpath}" "${displaymode}" "${initmode}"

(
cd "${cbdir}"
make distclean
)