FLOPPY = 360

BDOS = 0xF000
BDOSIMG = bdos/8086.bin

BIOS = 0xF800
BIOSIMG = bios/8086.bin

PROGRAMS = $(patsubst %.asm,%.com,$(wildcard com/*.asm))
DISTFILES = $(PROGRAMS)
ROMS =

QEMU_ARCH = $(shell uname -m)
QEMU = qemu-system-$(QEMU_ARCH)
QEMU_ARGS = $(addprefix --option-rom ,$(ROMS))

NASM = nasm
NASM_ARGS = -s -Ilib -Plib/nasmcomp.asm -w-macro-params
NASM_ARGS += -DBDOS=$(BDOS) -DBIOS=$(BIOS)

EMUL = utils/emul

ifdef KVM
QEMU_ARGS += --enable-kvm
endif

ifdef DEBUG
ROMS += rom/debug.rom
NASM_ARGS += -l $(basename $@).lst
endif

ifndef DISPLAY
QEMU_ARGS += --display curses
endif

.PHONY: default clean qemu-rom qemu-floppy

default: fdimage.img

# Host utils
utils/%: src/utils/%.c
	mkdir -p utils
	$(CC) -o $@ $<

CP437.BIN: src/cp437.bmp utils/bmp2font
	utils/bmp2font $< $@

# Boot sectors
boot/%.bs: boot/%.asm
	$(NASM) $(NASM_ARGS) -DFLOPPY=$(FLOPPY) -o $@ $<

# BIOS option roms
rom/%.rom: rom/%.asm utils/fix-rom
	$(NASM) $(NASM_ARGS) -o $@ $< && utils/fix-rom $@

# Regular COM programs
com/%.com: com/%.asm
	$(NASM) $(NASM_ARGS) -o $@ $<

bdos/%.bin: bdos/%.asm lib/*.asm
	$(NASM) $(NASM_ARGS) -o $@ $<

bios/%.bin: bios/%.asm
	$(NASM) $(NASM_ARGS) -o $@ $<

fdimage.img: boot/fat.bs $(BDOSIMG) $(BIOSIMG) $(DISTFILES)
	mformat -R 9 -C -i $@ -f $(FLOPPY) -B boot/fat.bs ::
	dd if=$(BDOSIMG) bs=512 seek=1 count=4 conv=notrunc of=$@
	dd if=$(BIOSIMG) bs=512 seek=5 count=4 conv=notrunc of=$@
	mcopy -i $@ $(DISTFILES) ::

hdimage.img: boot/mbr.bs fdimage.img
	cat boot/mbr.bs fdimage.img >$@

clean:
	find -name '*.lst' -delete
	rm -f $$(cat .gitignore) boot/*.bs com/*.com rom/*.rom utils/*
	rmdir utils

qemu-floppy: fdimage.img $(ROMS)
	$(QEMU) $(QEMU_ARGS) -boot a -fda fdimage.img

qemu-hdd: hdimage.img $(ROMS)
	$(QEMU) $(QEMU_ARGS) -boot c -hda hdimage.img