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CPP?=cpp
DTC?=dtc

DTC_CPP_FLAGS=-nostdinc -undef

# $(1) is the prefix of DTB files
NUM_CPUS := 1 2 4 8 16
CREATE_TARGET=$(foreach n, $(NUM_CPUS), $(1)_$(n)cpu.dtb)

TARGET_PREFIX=\
	armv7_gem5_v1 \
	armv8_gem5_v1 \
	armv8_gem5_v2

TARGETS=\
	$(foreach prefix, $(TARGET_PREFIX), $(call CREATE_TARGET, $(prefix))) \
	armv8_gem5_v1_big_little_2_2.dtb \
	armv8_gem5_v1_big_little_2_4.dtb \
	armv8_gem5_v2_big_little_2_2.dtb \
	armv8_gem5_v2_big_little_2_4.dtb

VEXPRESS_GEM5_V1_DTSIS=\
	platforms/vexpress_gem5_v1.dtsi \
	platforms/vexpress_gem5_v1_base.dtsi

VEXPRESS_GEM5_V2_DTSIS=\
	platforms/vexpress_gem5_v2.dtsi \
	platforms/vexpress_gem5_v2_base.dtsi

GEN_DTS=mkdir -p .gen; \
	$(CPP) -x assembler-with-cpp \
		$(DTC_CPP_FLAGS) \
		-DCONF_PLATFORM=\"../platforms/$(1)\" \
		-DCONF_CPUS=$(2) \
		-o $@ $<

all: $(TARGETS)

.gen/armv7_gem5_v1_%cpu.dts: armv7.dts $(VEXPRESS_GEM5_V1_DTSIS)
	$(call GEN_DTS,vexpress_gem5_v1.dtsi,$*)

.gen/armv8_gem5_v1_%cpu.dts: armv8.dts $(VEXPRESS_GEM5_V1_DTSIS)
	$(call GEN_DTS,vexpress_gem5_v1.dtsi,$*)

.gen/armv8_gem5_v2_%cpu.dts: armv8.dts $(VEXPRESS_GEM5_V2_DTSIS)
	$(call GEN_DTS,vexpress_gem5_v2.dtsi,$*)

.gen/armv8_gem5_v1_big_little%.dts: armv8_big_little.dts \
	$(VEXPRESS_GEM5_V1_DTSIS)
	$(call GEN_DTS,vexpress_gem5_v1.dtsi,$*)

.gen/armv8_gem5_v2_big_little%.dts: armv8_big_little.dts \
	$(VEXPRESS_GEM5_V2_DTSIS)
	$(call GEN_DTS,vexpress_gem5_v2.dtsi,$*)

%.dtb: .gen/%.dts
	$(DTC) -I dts -O dtb -o $@ $<


clean:
	$(RM) -r .gen
	$(RM) *.dtb