FLOPPY = 360

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

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

ifdef KVM
QEMU_ARGS += --enable-kvm
endif

ifdef DEBUG
QEMU_ARGS += -option-rom debug.rom
DEBUGROM = debug.rom
endif

ifndef DISPLAY
QEMU_ARGS += --display curses
endif

.PHONY: default clean qemu-rom qemu-floppy

default: kernel.rom

kernel.com: kernel/*.asm lib/*.inc
	nasm -s -o $@ -l kernel.lst -I lib -I kernel kernel/main.asm

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

boot/floppy.bs: boot/fatvbr.asm
	nasm -s -DCMDLINE='"KERNEL.COM"' -o $@ $<

boot/mbr.bs: boot/mbr.asm
	nasm -s -DFLOPPY=$(FLOPPY) -o $@ $<

programs/%.com: programs/%.asm
	nasm -s -I lib -o $@ $<

fdimage.img: boot/floppy.bs $(DISTFILES)
	mformat -C -i $@ -f $(FLOPPY) -B boot/floppy.bs ::
	mcopy -i $@ $(DISTFILES) ::

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

clean:
	rm -f *.com *.bin *.rom *.img *.log *.bs *.lst programs/*.com

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

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