ARCH            = $(shell uname -m | sed s,i[3456789]86,ia32,)
EFI_INCLUDE     = /usr/include/efi
EFI_INCLUDES    = -I$(EFI_INCLUDE) -I$(EFI_INCLUDE)/$(ARCH) -I$(EFI_INCLUDE)/protocol
EFI_PATH        = /usr/lib64/gnuefi
EFI_LIB_PATH    = /usr/lib64
LIB_GCC         = $(shell $(CC) -print-libgcc-file-name)
EFI_LIBS        = -lefi -lgnuefi $(LIB_GCC)
EFI_CRT_OBJS    = $(EFI_PATH)/crt0-efi-$(ARCH).o
EFI_LDS         = $(EFI_PATH)/elf_$(ARCH)_efi.lds
CFLAGS          = -O2 -g -mno-red-zone -fno-stack-protector -fno-strict-aliasing -fpic -fshort-wchar -fno-merge-constants -Wall -Werror $(EFI_INCLUDES)

ifeq ($(ARCH),x86_64)
	CFLAGS  += -DEFI_FUNCTION_WRAPPER
endif

LDFLAGS         = -nostdlib -znocombreloc -T $(EFI_LDS) -shared -Bsymbolic -L$(EFI_LIB_PATH) $(EFI_CRT_OBJS)
TARGET          = bootx64.efi
OBJS            = bootx64.o

all: $(TARGET)

bootx64.efi: $(OBJS)

exec:
	qemu-kvm -s -L ovmf -bios ovmf/OVMF.fd -hdb disk/disk.qcow2

%.efi: %.o 
	$(LD) $(LDFLAGS) $^ -o $@ $(EFI_LIBS)
	objcopy -j .text -j .sdata -j .data \
	-j .dynamic -j .dynsym  -j .rel \
	-j .rela -j .reloc \
	--target=efi-app-$(ARCH) $@ 
	strip $@
	modprobe nbd
	qemu-nbd -c /dev/nbd0 disk/disk.qcow2
	mount /dev/nbd0 /mnt/nbd
	cp bootx64.efi /mnt/nbd/EFI/BOOT/

clean:
	rm -f $(TARGET) $(OBJS)
	umount /mnt/nbd
	qemu-nbd -d /dev/nbd0
	rmmod nbd