modules-$(CONFIG_COREBOOT) += coreboot

ifeq "$(CONFIG_COREBOOT)" "y"

CONFIG_COREBOOT_ROM			?= coreboot.rom
CONFIG_COREBOOT_BOOTBLOCK	?=

ifeq "$(CONFIG_TARGET_ARCH)" "x86"
	COREBOOT_TARGET := i386
	LINUX_IMAGE_FILE := bzImage
else ifeq "$(CONFIG_TARGET_ARCH)" "ppc64"
	COREBOOT_TARGET := ppc64
	LINUX_IMAGE_FILE := zImage
else
	$(error "$(CONFIG_TARGET_ARCH) target isn't supported by this module")
endif

ifeq "$(CONFIG_COREBOOT_VERSION)" "4.8.1"
	coreboot_version := 4.8.1
	coreboot_hash := f0ddf4db0628c1fe1e8348c40084d9cbeb5771400c963fd419cda3995b69ad23
	coreboot-blobs_hash := 18aa509ae3af005a05d7b1e0b0246dc640249c14fc828f5144b6fd20bb10e295
else ifeq "$(CONFIG_COREBOOT_VERSION)" "4.11"
	coreboot_version := 4.11
	coreboot_hash := 97fd859b4c39a25534fe33c30eb86e54a233952e08a024c55858d11598a8ad87
	coreboot-blobs_hash := aa7855c5bd385b3360dadc043ea6bc93f564e6e4840d9b3ee5b9e696bbd055db
	coreboot_depends := $(if $(CONFIG_PURISM_BLOBS), purism-blobs)
else ifeq "$(CONFIG_COREBOOT_VERSION)" "4.13"
	coreboot_version := 4.13
	coreboot_hash := 4779da645a25ddebc78f1bd2bd0b740fb1e6479572648d4650042a2b9502856a
	coreboot-blobs_hash := 060656b46a7859d038ddeec3f7e086e85f146a50b280c4babec23c1188264dc8
	coreboot_depends := $(if $(CONFIG_PURISM_BLOBS), purism-blobs)
else ifeq "$(CONFIG_COREBOOT_VERSION)" "4.17"
	coreboot_version := 4.17
	coreboot_hash := 95da11d1c6a450385101a68799258a398ce965f4e46cce6fe8d5ebd74e50c125
	coreboot-blobs_hash := a2277fe7a2b2aab5da0aa335158460e00b852382f6736f2179992805702eb607
	coreboot_depends := $(if $(CONFIG_PURISM_BLOBS), purism-blobs)
	EXTRA_FLAGS := -fdebug-prefix-map=$(pwd)=heads -gno-record-gcc-switches -Wno-error=packed-not-aligned -Wno-error=address-of-packed-member
else ifeq "$(CONFIG_COREBOOT_VERSION)" "talos_2"
	coreboot_version = git
	coreboot_commit_hash = 2207bbcccba31ad89cf21607b0d8d05d8dc47c03
	coreboot_repo := https://github.com/Dasharo/coreboot

else
	$(error "$(BOARD): does not specify coreboot version under CONFIG_COREBOOT_VERSION")
endif 

#coreboot_version := git
#coreboot_repo := https://github.com/osresearch/coreboot
coreboot_base_dir := coreboot-$(coreboot_version)
coreboot_dir := $(coreboot_base_dir)/$(BOARD)
coreboot_tar := coreboot-$(coreboot_version).tar.xz
coreboot_url := https://www.coreboot.org/releases/$(coreboot_tar)

# coreboot builds are specialized on a per-target basis.
# The builds are done in a per-target subdirectory
CONFIG_COREBOOT_CONFIG ?= config/coreboot-$(BOARD).config

# Ensure that touching the config file will force a rebuild
$(build)/$(coreboot_dir)/.configured: $(CONFIG_COREBOOT_CONFIG)

EXTRA_FLAGS ?= -fdebug-prefix-map=$(pwd)=heads -gno-record-gcc-switches -Wno-error=packed-not-aligned

coreboot_configure := \
	mkdir -p "$(build)/$(coreboot_dir)" \
	&& $(call install_config,$(pwd)/$(CONFIG_COREBOOT_CONFIG),$(build)/$(coreboot_dir)/.config) \
	&& echo 'CONFIG_LOCALVERSION="Heads-$(HEADS_GIT_VERSION)"' >> $(build)/$(coreboot_dir)/.config \
	&& echo 'CONFIG_MAINBOARD_SMBIOS_PRODUCT_NAME="$(BOARD)"' >> $(build)/$(coreboot_dir)/.config \
	&& $(MAKE) olddefconfig \
		-C "$(build)/$(coreboot_base_dir)" \
		obj="$(build)/$(coreboot_dir)" \
		DOTCONFIG="$(build)/$(coreboot_dir)/.config" \
		BUILD_TIMELESS=1 \
		CFLAGS_x86_32="$(EXTRA_FLAGS)" \
		CFLAGS_x86_64="$(EXTRA_FLAGS)" \

COREBOOT_IASL="$(build)/$(coreboot_base_dir)/util/crossgcc/xgcc/bin/iasl"

# coreboot for x86 is built with the 32-bit compiler; ideally we could use the
# same x86_64-linux-musl -m32 to build it, but this causes some link errors that
# need to be tracked down.
#	CROSS="$(CROSS)" \

ifeq "$(CONFIG_TARGET_ARCH)" "x86"
COREBOOT_CROSS := $(dir $(CROSS))i386-linux-musl-
else
COREBOOT_CROSS := $(CROSS)
endif

coreboot_target := \
	-C "$(build)/$(coreboot_base_dir)" \
	obj="$(build)/$(coreboot_dir)" \
	CROSS="$(COREBOOT_CROSS)" \
	IASL="$(COREBOOT_IASL)" \
	DOTCONFIG="$(build)/$(coreboot_dir)/.config" \
	BUILD_TIMELESS=1 \
	CFLAGS_x86_32="$(EXTRA_FLAGS)" \
	CFLAGS_x86_64="$(EXTRA_FLAGS)" \
	$(MAKE_JOBS)

coreboot_output := $(CONFIG_COREBOOT_ROM)
coreboot_output += $(CONFIG_COREBOOT_BOOTBLOCK)
coreboot_depend += linux initrd $(musl_dep)

COREBOOT_TOOLCHAIN="$(build)/$(coreboot_base_dir)/.xcompile"
$(COREBOOT_TOOLCHAIN): $(build)/$(coreboot_base_dir)/.canary
	$(MAKE) -C "$(build)/$(coreboot_base_dir)" CPUS=$(CPUS) "crossgcc-$(COREBOOT_TARGET)"

$(build)/$(coreboot_dir)/.configured: $(COREBOOT_TOOLCHAIN)

# Force a rebuild if the inputs have changed
$(build)/$(coreboot_dir)/.build: \
	$(build)/$(BOARD)/$(LINUX_IMAGE_FILE) \
	$(build)/$(BOARD)/initrd.cpio.xz \

# This produces a ROM image that is written with the flashrom program
ifneq ($(CONFIG_COREBOOT),)

$(build)/$(BOARD)/$(CB_OUTPUT_FILE): $(build)/$(coreboot_dir)/.build
	# Use coreboot.rom, because custom output files might not be processed by cbfstool
	"$(build)/$(coreboot_dir)/cbfstool" "$(dir $<)coreboot.rom" print
	$(call do-copy,$(dir $<)$(CONFIG_COREBOOT_ROM),$@)
	@touch $@   # update the time stamp

ifneq ($(CONFIG_COREBOOT_BOOTBLOCK),)
$(build)/$(BOARD)/$(CB_BOOTBLOCK_FILE): $(build)/$(coreboot_dir)/.build
	$(call do-copy,$(dir $<)$(CONFIG_COREBOOT_BOOTBLOCK),$@)
	@touch $@   # update the time stamp
endif

endif

#
# Helpful target for reconfiguring the coreboot target
#
coreboot.menuconfig:
	$(MAKE) \
		-C "$(build)/$(coreboot_base_dir)" \
		DOTCONFIG="$(build)/$(coreboot_dir)/.config" \
		menuconfig

# The config file in the repo is stored as a "defconfig" format
# which only includes the options that have changed from the defaults.
coreboot.saveconfig:
	$(MAKE) \
		-C "$(build)/$(coreboot_base_dir)" \
		DOTCONFIG="$(build)/$(coreboot_dir)/.config" \
		DEFCONFIG="$(pwd)/$(CONFIG_COREBOOT_CONFIG)" \
		savedefconfig


# if we are not building from a git checkout,
# we must also download the coreboot-blobs tree
ifneq "$(coreboot_version)" "git"

coreboot_depends += coreboot-blobs
modules-y += coreboot-blobs

coreboot-blobs_version := $(coreboot_version)
coreboot-blobs_tar := coreboot-blobs-$(coreboot-blobs_version).tar.xz
coreboot-blobs_url := https://www.coreboot.org/releases/$(coreboot-blobs_tar)

ifeq "$(CONFIG_COREBOOT_VERSION)" "4.8.1"
	coreboot-blobs_tar_opt := --strip 3
	coreboot-blobs_dir := coreboot-$(coreboot-blobs_version)/3rdparty/blobs
else
	coreboot-blobs_tar_opt := --strip 2
	coreboot-blobs_dir := coreboot-$(coreboot-blobs_version)/3rdparty
endif

## there is nothing to build for the blobs, this should be
## made easier to make happen
coreboot-blobs_output := .built
coreboot-blobs_configure := echo -e 'all:\n\ttouch .built' > Makefile

endif
endif