FD_CYLINDERS = 40
FD_HEADS = 2
FD_SECTORS = 9

QEMU_ARCH = $(shell uname -m)
QEMU = qemu-system-$(QEMU_ARCH)
QEMU_ARGS =

ifdef KVM
QEMU_ARGS += --enable-kvm
endif

ifdef DEBUG
QEMU_ARGS += -chardev file,path=debugcon.log,id=seabios
QEMU_ARGS += -device isa-debugcon,iobase=0x402,chardev=seabios
endif

.PHONY: default clean qemu-rom qemu-floppy

default: kernel.rom

kernel.rom: kernel/*.asm kernel/*.inc lib/*.inc
	nasm -s -o $@ -I lib -I kernel kernel/main.asm && scripts/fix-rom.sh $@

boot/%.bin: boot/%.asm lib/*.inc
	nasm -s -o $@ -I lib $<

fdimage.img: boot/floppy.bin kernel.rom
	dd if=/dev/zero bs=512 count=$$(( $(FD_CYLINDERS) * $(FD_HEADS) * $(FD_SECTORS) )) of=$@
	mformat -i $@ -t $(FD_CYLINDERS) -h $(FD_HEADS) -n $(FD_SECTORS) -B boot/floppy.bin ::
	mcopy -i $@ kernel.rom ::kernel.rom

clean:
	rm -f *.com *.bin *.rom *.img *.log boot/*.bin

qemu-rom: kernel.rom
	$(QEMU) $(QEMU_ARGS) -option-rom kernel.rom

qemu-floppy: fdimage.img
	$(QEMU) $(QEMU_ARGS) -boot c -hda fdimage.img