FLOPPY = 360

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

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

NASM = nasm
NASM_ARGS = -s -I. -Ilib -w-macro-params -DFLOPPY=$(FLOPPY)

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 bootstrap clean qemu-rom qemu-floppy qemu-pxe

default: fdimage.img

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

cp437.bin: cp437.bmp utils/bmp2font
	utils/bmp2font $< $@

vga11.com: cp437.bin

# COM programs
%.com: %.asm
	$(NASM) $(NASM_ARGS) -DBASE=0x0100 -DCOM -o $@ $<

# Bootloaders, first sector on partition
%.bs: %.asm
	$(NASM) $(NASM_ARGS) -DBASE=0x7C00 -DBOOT -o $@ $<

# BIOS option roms
%.rom: rom/%.asm utils/fix-rom
	$(NASM) $(NASM_ARGS) -DBASE=0x0000 -DROM -o $@ $< && utils/fix-rom $@

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

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

part.img: fat32.bs $(DISTFILES)
	dd if=/dev/zero bs=1024 count=33k of=$@
	mformat -i $@ -F -B fat32.bs ::
	mmd -i $@ ::rdos
	mcopy -i $@ $(DISTFILES) ::rdos

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

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

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