#
# Copyright (C) 2016 OpenWrt.org
#
# 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

# On ARC initramfs is put before entry point and so entry point moves
# in memory from build to built. Thus we need to extract EP from vmlinux
# every time before generation of uImage.
define Build/calculate-ep
	$(eval KERNEL_ENTRY=$(shell $(KERNEL_CROSS)readelf -h $(LINUX_DIR)/vmlinux | grep "Entry point address" | grep -o 0x.*))
endef

define Build/build-dtb
	$(call Image/BuildDTB,$(DTS_DIR)/$(DEVICE_DTS).dts,$(DTS_DIR)/$(DEVICE_DTS).dtb)
endef

define Build/patch-dtb
	$(STAGING_DIR_HOST)/bin/patch-dtb $@ $(DTS_DIR)/$(DEVICE_DTS).dtb
endef

ifneq ($(CONFIG_TARGET_ROOTFS_INITRAMFS),)
# Root FS built-in
define Device/vmlinux
	KERNEL_SUFFIX := .elf
	KERNEL := kernel-bin | build-dtb | patch-dtb
	KERNEL_INITRAMFS_NAME = vmlinux-initramfs.elf
endef

define Device/nsim_hs
	$(call Device/vmlinux)
	DEVICE_PROFILE := nsim_hs
	DEVICE_DTS := nsim_hs_idu
endef
TARGET_DEVICES += nsim_hs
else
# Root FS on SD-card
KERNEL_LOADADDR := 0x80000000
DEVICE_DTS_LIST:= axs103_idu
FAT32_BLOCK_SIZE=1024
FAT32_BLOCKS=$(shell echo $$(($(CONFIG_AXS10X_SD_BOOT_PARTSIZE)*1024*1024/$(FAT32_BLOCK_SIZE))))

define Image/Build/SDCard
	rm -f $(KDIR_TMP)/$(IMG_PREFIX)-$(PROFILE)-boot.img
	mkdosfs $(KDIR_TMP)/$(IMG_PREFIX)-$(PROFILE)-boot.img -C $(FAT32_BLOCKS)
	mkimage -C none -A arc -T script -d uEnv.txt $(BIN_DIR)/uEnv.scr
	mcopy -i $(KDIR_TMP)/$(IMG_PREFIX)-$(PROFILE)-boot.img $(BIN_DIR)/uEnv.scr ::boot.scr
	mcopy -i $(KDIR_TMP)/$(IMG_PREFIX)-$(PROFILE)-boot.img $(DTS_DIR)/*.dtb ::
	mcopy -i $(KDIR_TMP)/$(IMG_PREFIX)-$(PROFILE)-boot.img $(BIN_DIR)/$(IMG_PREFIX)-uImage ::uImage

	./gen_axs10x_sdcard_img.sh \
		$(BIN_DIR)/$(IMG_PREFIX)-$(PROFILE)-sdcard-vfat-$(1).img \
		$(KDIR_TMP)/$(IMG_PREFIX)-$(PROFILE)-boot.img \
		$(KDIR)/root.$(1) \
		$(CONFIG_AXS10X_SD_BOOT_PARTSIZE) \
		$(CONFIG_TARGET_ROOTFS_PARTSIZE)

ifneq ($(CONFIG_TARGET_IMAGES_GZIP),)
	gzip -f9n $(BIN_DIR)/$(IMG_PREFIX)-$(PROFILE)-sdcard-vfat-$(1).img
endif
endef

define Image/BuildKernel
	# Build unified uImage
	$(call Build/calculate-ep)
	$(call Image/BuildKernel/MkuImage, \
		none, $(KERNEL_LOADADDR), $(KERNEL_ENTRY), \
		$(KDIR)/vmlinux, \
		$(BIN_DIR)/$(IMG_PREFIX)-uImage \
	)

	# Build .dtb for all boards we may run on
	$(foreach DEVICE_DTS,$(shell echo $(DEVICE_DTS_LIST)), $(call Build/build-dtb))
endef

define Image/Build
	$(call Image/Build/$(1),$(1))
	$(call Image/Build/SDCard,$(1))
	dd if=$(KDIR)/root.$(1) of=$(BIN_DIR)/$(IMG_PREFIX)-root.$(1) bs=128k conv=sync
endef
endif

$(eval $(call BuildImage))