PROGRAMS = hello.com
DISTFILES = kernel.bs $(PROGRAMS)
ROMS =

QEMU = qemu-system-i386
QEMU_ARGS = $(addprefix --option-rom ,$(ROMS))

VERSION = $(shell git log -1 --format=%cd --date=format:%Y%m%d)
PRODUCT = rdos
LABEL = $(PRODUCT) $(VERSION)

NASM = nasm
NASM_ARGS = -s -Ilib -DPRODUCT=$(PRODUCT) -DVERSION=$(VERSION)

QEMU_ARGS += $(shell test -w /dev/kvm && echo --enable-kvm)

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

ifndef DISPLAY
QEMU_ARGS += --display curses
endif

.PHONY: default bootstrap clean qemu-rom qemu-floppy qemu-pxe

default: fd1440.img

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

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

# Bootloaders, first sector on partition
%.bs: boot/%.asm
	$(NASM) $(NASM_ARGS) -o $@ $<

kernel.bs: kernel/*.asm

# Special case: variations of FAT vbr
fat1.bs: boot/fat.asm
	$(NASM) $(NASM_ARGS) -DFAT12 -DCHS -o $@ $<

fat4.bs: boot/fat.asm
	$(NASM) $(NASM_ARGS) -DFAT16 -DCHS -o $@ $<

fat6.bs: boot/fat.asm
	$(NASM) $(NASM_ARGS) -DFAT16 -DCHS -DLARGE -o $@ $<

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

fd%.img: fat1.bs $(DISTFILES)
	mformat -C -i $@ -f $* -v "$(LABEL)" -B fat1.bs ::
	mcopy      -i $@ $(DISTFILES) ::
	mattrib    -i $@ +s ::kernel.bs

hdimage.img: mbr.bs fd1440.img
	cat mbr.bs fd1440.img >$@

clean:
	rm -f *.com *.bs *.0 *.lst *.img *.bin *.rom
	rm -rf utils

qemu-floppy: fd1440.img $(ROMS)
	$(QEMU) $(QEMU_ARGS) -boot a -fda fd1440.img

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

qemu-pxe: pxeboot.0 $(ROMS)
	$(QEMU) $(QEMU_ARGS) -boot n \
		-option-rom /usr/share/qemu/pxe-rtl8139.rom \
		-device e1000,netdev=mynet0,mac=52:54:00:12:34:56 \
		-netdev user,id=mynet0,net=192.168.76.0/24,dhcpstart=192.168.76.9,tftp=$(CURDIR),bootfile=pxeboot.0

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