USE_LLVM	:= 1
CROSS_GCC	:= arm-none-eabi-
ifeq ($(USE_LLVM),1)
	COMPILER	:= LLVM=1
else
	COMPILER	:= CROSS_COMPILE=$(CROSS_GCC)
endif
build_dir	:= $(CURDIR)/build-vexpress
#dtb		:= $(build_dir)/arch/arm/boot/dts/vexpress-v2p-ca15_a7.dtb
#dtb		:= $(build_dir)/arch/arm/boot/dts/vexpress-v2p-ca15-tc1.dtb
dtb		:= $(build_dir)/arch/arm/boot/dts/vexpress-v2p-ca9.dtb
fallback_dtb	:= $(HOME)/vexpress-v2p-ca15_a7.dtb
output_dir	:= $(HOME)
output_nfs	:= /mnt/storage/nfsroot/vexpress
rootfs		:= $(HOME)/rootfs-vexpress.cpio
config_file     := $(build_dir)/.config
rootfsbase	:= $(shell basename $(rootfs))
makejobs	:= $(shell grep '^processor' /proc/cpuinfo | sort -u | wc -l)
makethreads	:= $(shell dc -e "$(makejobs) 1 + p")
console		:= console=ttyAMA0,38400n8
tftproot	:= /mnt/storage/tftpboot
nfsroot		:= 192.168.1.140\:/mnt/storage/nfsroot/nfsroot-vexpress-ca9

make_parallel	:= -j$(makethreads) -l$(makejobs)
make_options	:= -f Makefile \
                ARCH=arm \
		$(make_parallel) \
                $(COMPILER) \
                KBUILD_OUTPUT=$(build_dir)
# make_flags	:= CONFIG_DEBUG_SECTION_MISMATCH=y

.PHONY: help
help:
	@echo "make config - configure build dir for Vexpress"
	@echo "make build - build the kernel and produce a RAMdisk image"
	@echo
	@echo "example:"
	@echo "make -f vexpress.mak config"
	@echo "make -f vexpress.mak build"

.PHONY: have-rootfs
have-rootfs:
	@if [ ! -f $(rootfs) ] ; then \
	     echo "ERROR: no rootfs at $(rootfs)" ; \
	     echo "This is needed to boot the system." ; \
	     echo "ABORTING." ; \
	     exit 1 ; \
	else \
	     echo "Rootfs available at $(rootfs)" ; \
	fi
	@if [ ! -r $(rootfs) ] ; then \
	     echo "ERROR: rootfs at $(rootfs) not readable" ; \
	     echo "ABORTING." ; \
	     exit 1 ; \
	fi

.PHONY: have-crosscompiler
have-crosscompiler:
	@if [ $(USE_LLVM) -eq 1 ] ; then \
	   echo "LLVM OK" ; \
	else \
	   echo -n "Check that $(CROSS_COMPILE)gcc is available..." ; \
	   which $(CROSS_COMPILE)gcc > /dev/null ; \
	   if [ ! $$? -eq 0 ] ; then \
	      echo "ERROR: cross-compiler $(CROSS_COMPILE)gcc not in PATH=$$PATH!" ; \
	      echo "ABORTING." ; \
	      exit 1 ; \
	   else \
	      echo "OK" ;\
	   fi \
	fi

.PHONY: have-mkimage
have-mkimage:
	@echo -n "Check that mkimage is available..."
	@which mkimage > /dev/null ; \
	if [ ! $$? -eq 0 ] ; then \
	   echo "ERROR: mkimage not in PATH=$$PATH!" ; \
	   echo "This toom creates the uImage and comes from the uboot tools" ; \
	   echo "On Ubuntu/Debian sudo apt-get install uboot-mkimage" ; \
	   echo "ABORTING." ; \
	   exit 1 ; \
	else \
	   echo "OK" ;\
	fi

config-base: FORCE
	@mkdir -p $(build_dir)
	$(MAKE) $(make_options) vexpress_defconfig

# Config options needed to bring up rootfs on distros
config-distro: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable PARTITION_ADVANCED \
	--enable LDM_PARTITION \
	--enable MSDOS_PARTITION \
	--enable EXT4_FS \
	--enable DEVTMPFS \
	--enable CGROUPS \
	--enable CGROUP_FREEZER \
	--enable CGROUP_DEVICE \
	--enable CPUSETS \
	--enable PROC_PID_CPUSET \
	--enable CGROUP_CPUACCT \
	--enable RESOURCE_COUNTERS \
	--enable CGROUP_MEM_RES_CTLR \
	--enable CGROUP_MEM_RES_CTLR_DISABLED \
	--enable CGROUP_MEM_RES_CTLR_SWAP \
	--enable CGROUP_SCHED \
	--enable FAIR_GROUP_SCHED \
	--enable BLK_CGROUP \
	--enable NAMESPACES \
	--enable SCHED_AUTOGROUP \
	--enable FHANDLE \
	--enable SWAP \
	--enable AUTOFS4_FS \
	--enable BSD_PROCESS_ACCT \
	--enable BSD_PROCESS_ACCT_V3 \
	--enable TASKSTATS \
	--enable TASK_DELAY_ACCT \
	--enable TASK_XACCT \
	--enable TASK_IO_ACCOUNTING \
	--enable BUILD_BIN2C \
	--enable IKCONFIG \
	--enable IKCONFIG_PROC \
	--enable PAGE_COUNTER \
	--enable MEMCG \
	--enable MEMCG_SWAP \
	--enable MEMCG_SWAP_ENABLED \
	--enable MEMCG_KMEM \
	--enable CGROUP_PERF \
	--enable CGROUP_WRITEBACK \
	--enable USER_NS \
	--enable BLK_DEV_BSG \
	--enable BLK_DEV_BSGLIB \
	--enable BLK_DEV_INTEGRITY \
	--enable NET_INGRESS \
	--enable IP_ADVANCED_ROUTER \
	--set-str UEVENT_HELPER_PATH "" \
	--enable WANT_DEV_COREDUMP \
	--enable DEV_COREDUMP \
	--enable CHR_DEV_SG \
	--enable KEYS \
	--enable ENCRYPTED_KEYS \
	--enable SECURITY \
	--enable SECURITYFS \
	--enable SECURITY_NETWORK \
	--enable SECURITY_NETWORK_XFRM \
	--enable SECURITY_PATH \
	--enable INTEGRITY \
	--enable CRYPTO_USER_API \
	--enable CRYPTO_USER_API_HASH \
	--enable CRYPTO_USER_API_SKCIPHER \
	--enable CRYPTO_USER_API_AEAD \
	--enable ARM_CRYPTO \
	--enable CRYPTO_SHA1_ARM \
	--enable CRYPTO_SHA256_ARM \
	--enable CRYPTO_SHA512_ARM \
	--enable CRYPTO_AES_ARM \
	--enable BINARY_PRINTF \
	--enable MD \
	--enable BLK_DEV_DM_BUILTIN \
	--enable BLK_DEV_DM \
	--enable DM_CRYPT \
	--enable DM_UEVENT

config-mainlined: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable FB \
	--disable FB_ARMCLCD \
	--enable CMA \
	--enable CMA_DEBUG \
	--enable CMA_DEBUGFS \
	--enable DMA_CMA \
	--enable DRM \
	--enable DRM_PL111 \
	--enable FRAMEBUFFER_CONSOLE \
	--enable DRM_PANEL \
	--enable DRM_PANEL_SIMPLE \
	--enable DRM_BRIDGE \
	--enable DRM_PANEL_BRIDGE \
	--enable DRM_SII902X \
	--enable LOGO \
	--enable MTD_AFS_PARTS

config-initramfs: have-rootfs config-base
	@cp $(rootfs) $(build_dir)/$(rootfsbase)
	# Configure in the initramfs
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable BLK_DEV_INITRD \
	--set-str INITRAMFS_SOURCE $(rootfsbase) \
	--enable RD_BZIP2 \
	--enable INITRAMFS_COMPRESSION_BZIP2

# NFS exports configuration:
# /mnt/storage/nfsroot/nfsroot-vexpress-ca9 192.168.1.0/24(rw,sync,no_subtree_check,no_root_squash,no_all_squash)
config-nfsroot: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable NET \
	--enable INET \
	--enable NETDEVICES \
	--enable ETHERNET \
	--enable NETWORK_FILESYSTEMS \
	--enable NFS_FS \
	--disable NFS_V2 \
	--enable ROOT_NFS \
	--disable BLK_DEV_INITRD \
	--set-str CMDLINE "${console} root=/dev/nfs rw nfsroot=${nfsroot},tcp,v3 ip=dhcp" \
	--enable CONFIG_CMDLINE_FORCE

config-ca9: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--disable CACHE_L2X0 \
	--enable CPU_ICACHE_DISABLE

# DEBUG_VEXPRESS_UART0_CA9 for CA9
# DEBUG_VEXPRESS_UART0_RS1 for RS1 (CA15)
config-earlydebug: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable DEBUG_LL \
	--enable EARLY_PRINTK \
	--enable DEBUG_VEXPRESS_UART0_RS1 \
	--enable DEBUG_UNCOMPRESS \
	--set-str CMDLINE "${console} root=/dev/ram0 earlyprintk mem=128M"

config-ftrace-console: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable FTRACE \
	--enable BOOTTIME_TRACING \
	--enable FUNCTION_TRACER \
	--disable CMDLINE_FROM_BOOTLOADER \
	--enable CMDLINE_FORCE \
	--set-str CMDLINE "${console} root=/dev/ram0 earlyprintk mem=128M ftrace=function_graph ftrace_filter=init_* tp_printk tp_printk_stop_on_boot"

config-dt: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable USE_OF \
	--disable ATAGS \
	--disable ARM_ATAG_DTB_COMPAT \
	--enable LEDS_SYSCON \
	--enable REGULATOR \
	--enable REGULATOR_FIXED_VOLTAGE \
	--enable PROC_DEVICETREE

config-dt-appended: config-dt
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable ARM_APPENDED_DTB

config-kernel-in-vmalloc: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable EMBEDDED \
	--disable ARM_PATCH_PHYS_VIRT \
	--enable ARM_KERNEL_IN_VMALLOC \
	--disable CPU_IDLE

config-lpae: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable ARM_LPAE \
	--disable CPU_TTBR0_PAN \
	--disable ARM_PAN

config-lpae-pan: config-lpae
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable ARM_PAN \
	--enable CPU_TTBR0_PAN \
	--enable LKDTM

config-addsep: config-base config-kernel-in-vmalloc config-lpae
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable ARM_KERNEL_SEPARATION

config-kasan: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable KASAN \
	--enable KASAN_OUTLINE \
	--enable STACKTRACE \
	--enable SLUB_DEBUG_ON \
	--enable TEST_KASAN

config-cfi: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable CFI_CLANG \
	--enable CFI_PERMISSIVE \
	--enable FTRACE \
	--enable FUNCTION_TRACER \
	--enable LKDTM

# We disable modules while developing so the first executable
# paged in will be /sbin/init and not /sbin/modprobe
config-4g-4g: config-base config-kernel-in-vmalloc config-addsep config-lpae
	$(CURDIR)/scripts/config --file $(config_file) \
	--disable MODULES \
	--enable VMSPLIT_4G_4G

#config: config-base config-initramfs config-kernel-in-vmalloc config-earlydebug
#config: config-initramfs config-kasan
#config: config-base config-dt config-distro
#config-lpae config-kernel-in-vmalloc config-4g-4g
#config-nfsroot

# --enable ARM_BIG_LITTLE_CPUIDLE
# config-kernel-in-vmalloc config-lpae
#  config-kernel-in-vmalloc config-addsep
#config: config-base config-initramfs config-kernel-in-vmalloc config-addsep
#config: config-base config-initramfs config-kernel-in-vmalloc config-lpae
#config: config-base config-initramfs config-lpae-pan
config: config-base config-initramfs config-cfi
	# Reconfigure a bit
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable SMP \
	--enable REGULATOR_GPIO \
	--enable MCPM \
	--enable BIG_LITTLE \
	--disable BL_SWITCHER \
	--enable ARM_CCI400_PORT_CTRL \
	--enable CPU_FREQ \
	--enable CPUFREQ_DT \
	--enable CPUFREQ_DT_PLATDEV \
	--enable ARCH_VEXPRESS_DCSCB \
	--enable ARCH_VEXPRESS_SPC \
	--enable ARCH_VEXPRESS_TC2_PM \
	--enable DEBUG \
	--enable DEBUG_FS \
	--enable DEBUG_VM_PGTABLE \
	--set-str LOG_BUF_SHIFT "18" \
	--disable MODULES
	yes "" | make $(make_options) oldconfig

# Under consideration
#	--enable LEDS_TRIGGER_ARM_CPU
#	--enable DMADEVICES
#	--enable AMBA_PL08X

menuconfig: FORCE
	$(MAKE) $(make_options) menuconfig

saveconfig: config-base config-mainlined
	$(MAKE) $(make_options) savedefconfig
	cp $(build_dir)/defconfig arch/arm/configs/vexpress_defconfig

build-dtbs: FORCE
	#$(MAKE) $(make_options) dtbs $(make_flags)
	echo "Skip building DTB"

check-bindings: FORCE
	$(MAKE) $(make_options) dt_binding_check -k $(make_flags)
	$(MAKE) $(make_options) dtbs_check -k $(make_flags)

build-zimage: have-crosscompiler
	$(MAKE) $(make_options) zImage $(make_flags)
	@echo "Copy vmlinux to $(output_dir)/vmlinux..."
	@cp -f $(build_dir)/vmlinux $(output_dir)/vmlinux
	@echo "Copy zImage to $(output_dir)/zImage..."
	@cp -f $(build_dir)/arch/arm/boot/zImage $(output_dir)/zImage

build-zimage-dt: build-zimage build-dtbs
	@if [ ! -r $(dtb) ] ; then \
	   echo "Warning: NO DTB in $(dtb)! Using fallback." ; \
	fi
	@echo "Catenate DTB onto zImage $(output_dir)/zImage..."
	@if [ -r $(dtb) ] ; then \
	   cat $(dtb) >> $(output_dir)/zImage ; \
	else \
	   cat $(fallback_dtb) >> $(output_dir)/zImage ; \
	fi

build-modules: build-zimage build-dtbs
	$(MAKE) $(make_options) modules $(make_flags)

build: build-zimage build-dtbs
	# Example create assembly for a single file
	# $(MAKE) $(make_options) lib/strnlen_user.s $(make_flags)
	@if [ -r $(dtb) ] ; then \
	    echo "Copy DTB to $(output_dir)/$(dtb)..." ; \
	    cp -f $(dtb) $(output_dir) ; \
	fi
	@if [ -w $(tftproot) ] ; then \
	   echo "Copy to TFTP output dir $(tftproot)" ; \
	   cp $(output_dir)/vmlinux $(tftproot) ; \
	   cp $(output_dir)/zImage $(tftproot) ; \
	   if [ -r $(dtb) ] ; then \
	      cp $(dtb) $(tftproot)/vexpress.dtb ; \
	      echo "copied $(dtb) to $(tftproot)/vexpress.dtb ; \
	   else \
	      cp $(fallback_dtb) $(tftproot)/vexpress.dtb ; \
	      echo "copied $(fallback_dtb) to $(tftproot)/vexpress.dtb ; \
	   fi \
	fi
	@if [ -w $(output_nfs) ]; then \
	    echo "Copying to NFS root $(output_nfs)" ; \
	    cp -f $(output_dir)/vmlinux $(output_nfs) ; \
	    cp -f $(output_dir)/zImage $(output_nfs) ; \
	    if [ -r $(dtb) ] ; then \
	       cp $(dtb) $(output_nfs) ; \
	       cp $(dtb) $(output_nfs)/vexpress.dtb ; \
	    fi \
	fi
	@echo "TFTP boot:"
	@echo "setenv bootargs mem=128M console=ttyAMA0,38400n8 root=/dev/sda1 rw rootwait rootfstype=ext4 init=/sbin/init"
	@echo "set serverip 192.168.1.140 ; set ipaddr 192.168.1.35 ; tftpboot 0x62000000 zImage ; tftpboot 0x68000000 vexpress.dtb ; bootz 0x62000000 - 0x68000000"
	@echo "setenv fdt_high 0xffffffff ; setenv serverip 192.168.1.140 ; setenv ipaddr 192.168.1.35 ; tftpboot 0x80008000 zImage ; tftpboot 0x81000000 vexpress.dtb ; bootz 0x80008000 - 0x81000000"

clean:
	$(MAKE) -f Makefile clean
	rm -rf $(build_dir)

# Rules without commands or prerequisites that do not match a file name
# are considered to always change when make runs. This means that any rule
# that depends on FORCE will always be remade also.
FORCE: