TARGET              := monitor
BUILDDIR            := build

METAL_C_SRCFILES    := $(wildcard *.c)
METAL_ASM_SRCFILES  := $(wildcard *.asm)
METAL_RELFILES      := $(METAL_ASM_SRCFILES:%.asm=$(BUILDDIR)/metal/%.rel) \
                       $(METAL_C_SRCFILES:%.c=$(BUILDDIR)/metal/%.rel)

METAL_CC            := sdcc
METAL_AS            := sdasz80
METAL_MAKEBIN       := makebin
METAL_FLAGS         := -mz80 --no-std-crt0 --code-loc 0xC080 --code-size 0x2F80 --data-loc 0xF000
METAL_CPPFLAGS      := -I src -I $(BUILDDIR)/metal/generated --disable-warning 283
METAL_BIN_SIZE      := 32768
METAL_RAM_SIZE      := 16384
METAL_IMAGE_SIZE    := 65536
MONITOR_BASE        := 0xC000
MONITOR_ROM_OFFSET  := 128

.DEFAULT_GOAL       := metal

.PHONY: all metal clean

all: metal

metal: $(BUILDDIR)/metal/$(TARGET).ihx $(BUILDDIR)/metal/$(TARGET).bin $(BUILDDIR)/metal/$(TARGET).prog.bin
	@stored=$$(wc -c < $(BUILDDIR)/metal/$(TARGET).prog.bin); \
	awk -v rom_capacity=$(METAL_BIN_SIZE) -v stored=$$stored -v ram_capacity=$(METAL_RAM_SIZE) '\
		$$1 ~ /^_(CODE|HOME|GSINIT|GSFINAL|INITIALIZER)$$/ || $$1 ~ /^_ITABLE/ { code += $$5 } \
		$$1 ~ /^_(DATA|INITIALIZED|BSEG|BSS|HEAP)$$/ { data += $$5 } \
		END { \
			printf "\nMemory usage:\n"; \
			printf "  ROM storage:  %5u / %5u bytes (%5.1f%%)\n", stored, rom_capacity, 100 * stored / rom_capacity; \
			printf "  Runtime RAM:  %5u / %5u bytes (%5.1f%%), %5u bytes for growth/stack\n", code + data, ram_capacity, 100 * (code + data) / ram_capacity, ram_capacity - code - data; \
			printf "    code/vector: %5u bytes; static data: %5u bytes\n", code, data; \
		}' $(BUILDDIR)/metal/$(TARGET).map

$(BUILDDIR)/metal/$(TARGET).ihx: $(METAL_RELFILES)
	@mkdir -p $(@D)
	$(METAL_CC) $(METAL_FLAGS) -o $@ $(METAL_RELFILES)

$(BUILDDIR)/metal/$(TARGET).flat.bin: $(BUILDDIR)/metal/$(TARGET).ihx
	$(METAL_MAKEBIN) -s $(METAL_IMAGE_SIZE) $< $@

$(BUILDDIR)/metal/$(TARGET).prog.bin: $(BUILDDIR)/metal/$(TARGET).flat.bin
	@payload_end=$$(awk '$$1 == "DEF" && $$2 == "monitor_image_end" { print $$3 }' $(BUILDDIR)/metal/$(TARGET).noi); \
	payload_size=$$((payload_end - $(MONITOR_BASE))); \
	test $$payload_size -gt 0; \
	dd if=$< of=$@ bs=1 count=$(MONITOR_ROM_OFFSET) status=none; \
	dd if=$< of=$@ bs=1 skip=$$(( $(MONITOR_BASE) )) seek=$(MONITOR_ROM_OFFSET) count=$$payload_size conv=notrunc status=none

$(BUILDDIR)/metal/$(TARGET).bin: $(BUILDDIR)/metal/$(TARGET).flat.bin $(BUILDDIR)/metal/$(TARGET).prog.bin
	dd if=$< of=$@ bs=$(METAL_BIN_SIZE) count=1 status=none
	dd if=$(BUILDDIR)/metal/$(TARGET).prog.bin of=$@ conv=notrunc status=none

$(BUILDDIR)/metal/%.rel: %.c
	@mkdir -p $(@D)
	$(METAL_CC) $(METAL_FLAGS) $(METAL_CPPFLAGS) -o $@ -c $<

$(BUILDDIR)/metal/%.rel: %.asm
	@mkdir -p $(@D)
	$(METAL_AS) -plosgff -o $@ $<

clean:
	rm -rf $(BUILDDIR)

-include $(EMU_DEPFILES)