Makefile

ARCH            = $(shell uname -m | sed s,i[3456789]86,ia32,)

OBJS            = boot_loader.o boot_page_table.o
TARGET          = boot_loader.efi

LIB             = /usr/lib
EFILIB          = /usr/lib
EFI_CRT_OBJS    = $(EFILIB)/crt0-efi-$(ARCH).o
EFI_LDS         = $(EFILIB)/elf_$(ARCH)_efi.lds

ifeq ($(origin KERNEL_BUILD),undefined)
	KERNEL_BUILD = cmake-build-debug
endif

ifeq ($(origin EFI_SHELL),undefined)
	EFI_SHELL = /usr/share/edk2-shell/x64/Shell_Full.efi
endif

CFLAGS          += -Iinclude -fno-stack-protector -fpic \
          -fshort-wchar -mno-red-zone -Wall
ifeq ($(ARCH),x86_64)
  CFLAGS += -DEFI_FUNCTION_WRAPPER
endif

LDFLAGS         += -nostdlib -znocombreloc -T $(EFI_LDS) -shared \
          -Bsymbolic -L $(EFILIB) -L $(LIB) $(EFI_CRT_OBJS)

all: $(TARGET)

boot_loader.so: $(OBJS)
	ld $(LDFLAGS) $(OBJS) -o $@ -lefi -lgnuefi


.FORCE:

# use cmake to enable IDE
kernel: .FORCE
	make -C $(KERNEL_BUILD) kernel
	ln -sf $(KERNEL_BUILD)/kernel kernel
#	g++ -nostdlib -c -o kernel.o kernel.cpp
#	ld -static -T kernel.ld -o kernel kernel.o

boot_loader.efi: boot_loader.so
	objcopy -j .text -j .sdata -j .data -j .dynamic \
        -j .dynsym  -j .rel -j .rela -j .reloc \
        --target=efi-app-$(ARCH) boot_loader.so boot_loader.efi

setup:
	echo "uncomment me to run because this is potentially dangerous"
#	dd if=/dev/zero of=.disk.raw.source bs=1M count=128
#	parted -s .disk.raw.source -- mktable gpt mkpart primary fat32 1MiB 64MiB
#	udisksctl loop-setup -f .disk.raw.source
#	sudo mkfs.vfat -F 32 /dev/loop0p1
#	udisksctl loop-delete /dev/loop0
#	cp .disk.raw.source disk.raw

# a gpt partition table and create an fat32 partion(esp) and 1 ext4 partition
disk.raw: boot_loader.efi startup.nsh kernel
	# to remake to .disk.raw.source
	# dd if=/dev/zero of=.disk.raw.source bs=1M count=128
	# parted -s .disk.raw.source -- mktable gpt mkpart primary fat32 1MiB 64MiB
	# udisksctl loop-setup -f .disk.raw.source
	# mkfs.vfat -F 32 /dev/loopXp1
	# udiskctl loop-delete /dev/loopX
	# cp .disk.raw.source disk.raw
	./build_disk_image.sh $(EFI_SHELL)

# disk-linux.raw:
#   $(eval loop_device := $(shell udisksctl loop-setup -f disk-linux.raw | python3 -c "import sys; print(sys.stdin.read().split()[-1][:-1])"))
#   $(info loop device ${loop_device})
#   $(eval mount_path := $(shell udisksctl mount -b $(loop_device)p1 | python3 -c "import sys; print(sys.stdin.read().split()[-1])"))
#   rm -rf ${mount_path}/EFI ${mount_path}/boot_loader.efi ${mount_path}/startup.nsh
#   cp -r linux-efi/EFI ${mount_path}/EFI
#   udisksctl unmount -b ${loop_device}p1
#   udisksctl loop-delete -b ${loop_device}

sda.vdi: disk.raw startup.nsh kernel
	rm -f sda.vdi
	VBoxManage convertdd disk.raw sda.vdi --format VDI

clean:
	rm *.o *.so *.efi sdb.vdi