# 
# Copyright (C) 2006-2012 OpenWrt.org
# Copyright (C) 2019 Alexander Couzens <lynxis@fe80.eu>
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
include $(TOPDIR)/rules.mk
include $(INCLUDE_DIR)/image.mk

export PATH=$(TARGET_PATH):/sbin

GRUB2_MODULES = biosdisk boot chain configfile ext2 linux ls part_msdos reboot serial test vga
GRUB2_MODULES_ISO = biosdisk boot chain configfile iso9660 linux ls part_msdos reboot serial test vga
GRUB_TERMINALS =
GRUB_SERIAL_CONFIG =
GRUB_TERMINAL_CONFIG =
GRUB_CONSOLE_CMDLINE =

USE_ATKBD = generic 64

ifneq ($(strip $(foreach subtarget,$(USE_ATKBD),$(CONFIG_TARGET_x86_$(subtarget)))),)
  GRUB2_MODULES += at_keyboard
  GRUB2_MODULES_ISO += at_keyboard
endif

ifneq ($(CONFIG_GRUB_CONSOLE),)
  GRUB_CONSOLE_CMDLINE += console=tty0
  GRUB_TERMINALS += console
endif

GRUB_SERIAL:=$(call qstrip,$(CONFIG_GRUB_SERIAL))

ifneq ($(GRUB_SERIAL),)
  GRUB_CONSOLE_CMDLINE += console=$(GRUB_SERIAL),$(CONFIG_GRUB_BAUDRATE)n8$(if $(CONFIG_GRUB_FLOWCONTROL),r,)
  GRUB_SERIAL_CONFIG := serial --unit=0 --speed=$(CONFIG_GRUB_BAUDRATE) --word=8 --parity=no --stop=1 --rtscts=$(if $(CONFIG_GRUB_FLOWCONTROL),on,off)
  GRUB_TERMINALS += serial
endif

ifneq ($(GRUB_TERMINALS),)
  GRUB_TERMINAL_CONFIG := terminal_input $(GRUB_TERMINALS); terminal_output $(GRUB_TERMINALS)
endif

SIGNATURE:=$(shell perl -e 'printf("%08x", rand(0xFFFFFFFF))')
ROOTPART:=$(call qstrip,$(CONFIG_TARGET_ROOTFS_PARTNAME))
ROOTPART:=$(if $(ROOTPART),$(ROOTPART),PARTUUID=$(SIGNATURE)-02)

GRUB_TIMEOUT:=$(call qstrip,$(CONFIG_GRUB_TIMEOUT))
GRUB_TITLE:=$(call qstrip,$(CONFIG_GRUB_TITLE))

# Convert a raw image into a $1 type image.
# E.g. | qemu-image vdi
define Build/qemu-image
	qemu-img convert -f raw -O $1 \
		$@ \
		$@.new
	mv $@.new $@
endef

define Build/grubpc
	-rm -rf "$@.grubpc" "$@.root.grub"
	$(INSTALL_DIR) $@.root.grub/boot/grub $@.grubpc
	$(CP) $(IMAGE_KERNEL) $@.root.grub/boot/vmlinuz
	grub-mkimage \
		-p /boot/grub \
		-d $(STAGING_DIR_HOST)/lib/grub/i386-pc \
		-o $@.grubpc/core.img \
		-O i386-pc \
		-c ./grub-early.cfg \
		$(GRUB2_MODULES)
	$(CP) $(STAGING_DIR_HOST)/lib/grub/i386-pc/*.img $@.grubpc/
	echo '(hd0) $@' > $@.grubpc/device.map
	sed \
		-e 's#@SERIAL_CONFIG@#$(strip $(GRUB_SERIAL_CONFIG))#g' \
		-e 's#@TERMINAL_CONFIG@#$(strip $(GRUB_TERMINAL_CONFIG))#g' \
		-e 's#@CMDLINE@#$(strip $(call Image/cmdline/$(FILESYSTEM)) $(BOOTOPTS) $(GRUB_CONSOLE_CMDLINE))#g' \
		-e 's#@TIMEOUT@#$(GRUB_TIMEOUT)#g' \
		-e 's#@TITLE@#$(GRUB_TITLE)#g' \
		./grub.cfg > $@.root.grub/boot/grub/grub.cfg
	-$(CP) $(STAGING_DIR_ROOT)/boot/. $@.root.grub/boot/
	PADDING="1" SIGNATURE="$(SIGNATURE)" PATH="$(TARGET_PATH)" $(SCRIPT_DIR)/gen_image_generic.sh \
		$@ \
		$(CONFIG_TARGET_KERNEL_PARTSIZE) $@.root.grub \
		$(CONFIG_TARGET_ROOTFS_PARTSIZE) $(IMAGE_ROOTFS) \
		256
	grub-bios-setup \
		--device-map="$@.grubpc/device.map" \
		-d "$@.grubpc" \
		-r "hd0,msdos1" \
		"$@"
	rm -rf "$@.grubpc" "$@.root.grub"
endef

ifneq ($(CONFIG_GRUB_IMAGES),)
  BOOTOPTS:=$(call qstrip,$(CONFIG_GRUB_BOOTOPTS))

  define Image/cmdline/ext4
    root=$(ROOTPART) rootfstype=ext4 rootwait
  endef

  define Image/cmdline/squashfs
    root=$(ROOTPART) rootfstype=squashfs rootwait
  endef
endif

define Build/grubiso
	-rm -rf "$@.root.grub/boot/grub" "$@.grubiso"
	$(INSTALL_DIR) $@.root.grub/boot/grub $@.grubiso
	$(CP) $(IMAGE_KERNEL) $@.root.grub/boot/vmlinuz
	grub-mkimage \
		-p /boot/grub \
		-d $(STAGING_DIR_HOST)/lib/grub/i386-pc \
		-o $@.grub2/eltorito.img \
		-O i386-pc \
		-c ./grub-early.cfg \
		$(GRUB2_MODULES_ISO)
	cat \
		$(STAGING_DIR_HOST)/lib/grub/i386-pc/cdboot.img \
		$@.grub2/eltorito.img \
		> $@.root.grub/boot/grub/eltorito.img
	sed \
		-e 's#@SERIAL_CONFIG@#$(strip $(GRUB_SERIAL_CONFIG))#g' \
		-e 's#@TERMINAL_CONFIG@#$(strip $(GRUB_TERMINAL_CONFIG))#g' \
		-e 's#@CMDLINE@#root=/dev/sr0 rootfstype=iso9660 rootwait $(strip $(call Image/cmdline/$(FILESYSTEM)) $(BOOTOPTS) $(GRUB_CONSOLE_CMDLINE))#g' \
		-e 's#@TIMEOUT@#$(GRUB_TIMEOUT)#g' \
		-e 's#@TITLE@#$(GRUB_TITLE)#g' \
		./grub-iso.cfg > $@.root.grub/boot/grub/grub.cfg
	-$(CP) $(STAGING_DIR_ROOT)/boot/. $@.root.grub/boot/
	mkisofs -R -b boot/grub/eltorito.img -no-emul-boot -boot-info-table \
		-o $@ $@.root.grub $(TARGET_DIR)
	rm -rf "$@.root.grub/boot/grub" "$@.grubiso"
endef

define Device/generic
  PROFILES := Default
  DEVICE_TITLE := Generic (ext4/squashfs)
  KERNEL := kernel-bin
  IMAGES := vdi.gz vmdk.gz raw.img.gz
  IMAGE/vdi.gz := grubpc | qemu-image vdi | gzip
  IMAGE/vmdk.gz := grubpc | qemu-image vmdk | gzip
  IMAGE/raw.img.gz := grubpc | gzip
  FILESYSTEMS := squashfs ext4
endef

TARGET_DEVICES += generic

define Device/generic-iso
  PROFILES := Default
  DEVICE_TITLE := Generic (iso)
  KERNEL := kernel-bin
  IMAGES := iso.gz
  IMAGE/iso.gz := grubiso | append-metadata | gzip
  FILESYSTEMS := iso
endef

TARGET_DEVICES += generic-iso

ifeq ($(SUBTARGET),geode)

define Device/geos
  DEVICE_TITLE := Geos
  KERNEL := kernel-bin
  IMAGES := iso.gz
  IMAGE/iso.gz := grubiso | append-metadata | gzip
  FILESYSTEMS := iso
  DEVICE_PACKAGES := soloscli linux-atm br2684ctl ppp-mod-pppoa pppdump pppstats \
		hwclock flashrom tc kmod-pppoa kmod-8139cp kmod-mppe \
		kmod-usb-ohci-pci kmod-hwmon-lm90
endef
TARGET_DEVICES += geos

endif

$(eval $(call BuildImage))