default: out/main

# asm and init order is important
src/main.asm: src/uefi.asm src/impl.asm src/bootstrap.asm
src/main.asm: init/sys.f init/uefi.f init/blurb.f

out:
	mkdir -p out

out/main: src/main.asm | out
	fasm $< $@

# Start script
out/startup.nsh: out
	echo 'fs0:main' > $@

.PHONY: qemu

# Based on https://wiki.osdev.org/UEFI#Emulation_with_QEMU_and_OVMF
qemu: ARGS = -cpu qemu64
qemu: ARGS += -drive if=pflash,format=raw,unit=0,file=OVMF_CODE.fd,readonly=on
qemu: ARGS += -drive if=pflash,format=raw,unit=1,file=OVMF_VARS.fd
qemu: ARGS += -net none
qemu: ARGS += -drive format=raw,file=fat:rw:out
qemu: ARGS += -display type=gtk,zoom-to-fit=on
qemu: out/main out/startup.nsh OVMF_CODE.fd OVMF_VARS.fd
	qemu-system-x86_64 $(ARGS)

OVMF_CODE.fd OVMF_VARS.fd: %: /usr/share/OVMF/%
	cp $< $@

OVMF: OVMF_CODE.fd OVMF_VARS.fd

EFI.raw: out/main
	mkfs.fat -C $@ 2048 # =1Mb
	mmd -i "$@" ::efi
	mmd -i "$@" ::efi/boot
	mcopy -i "$@" Makefile "::EFI/BOOT"
	mcopy -i "$@" out/main "::EFI/BOOT/bootx64.efi"

.PHONY: clean
clean:
	rm -rf out OVMF_CODE.fd OVMF_VARS.fd EFI.raw