Make.common

ARCH            = x64
# You can alter the subsystem according to your EFI binary target:
# 10 = EFI application
# 11 = EFI boot service driver
# 12 = EFI runtime driver
SUBSYSTEM       = 11

# Try to auto-detect the target ARCH
ifeq ($(shell uname -o),Msys)
  IS_MINGW32    = $(findstring MINGW32,$(shell uname -s))
  IS_MINGW64    = $(findstring MINGW64,$(shell uname -s))
  ifeq ($(IS_MINGW32),MINGW32)
    ARCH        = ia32
  endif
  ifeq ($(IS_MINGW64),MINGW64)
    ARCH        = x64
  endif
else
  ifeq ($(shell uname -m),x86_64)
    ARCH        = x64
  else ifeq ($(shell uname -m),arm)
    ARCH        = arm
    CROSS_COMPILE =
  else ifeq ($(shell uname -m),aa64)
    ARCH        = aarch64
    CROSS_COMPILE =
  else ifeq ($(shell uname -m),riscv64)
    ARCH        = riscv64
    CROSS_COMPILE =
  else ifeq ($(shell uname -m),loongarch64)
    ARCH        = loongarch64
    CROSS_COMPILE =
  else
    ARCH        = ia32
  endif
endif

# Auto-detect the host arch for MinGW
ifeq ($(shell uname -m),x86_64)
  MINGW_HOST    = w64
else
  MINGW_HOST    = w32
endif

CRT0_ARCH       = $(ARCH)

ifeq ($(ARCH),x64)
  GNUEFI_ARCH   = x86_64
  GCC_ARCH      = x86_64
  CPU_ARCH      = x86_64
  CROSS_COMPILE = $(GCC_ARCH)-$(MINGW_HOST)-mingw32-
  EP_PREFIX     =
  CFLAGS        = -m64 -mno-red-zone
  LDFLAGS       = -Wl,-dll -Wl,--subsystem,$(SUBSYSTEM)
else ifeq ($(ARCH),ia32)
  GNUEFI_ARCH   = ia32
  GCC_ARCH      = i686
  CPU_ARCH      = i386
  CROSS_COMPILE = $(GCC_ARCH)-$(MINGW_HOST)-mingw32-
  EP_PREFIX     = _
  CFLAGS        = -m32 -mno-red-zone -Wno-pointer-to-int-cast
  LDFLAGS       = -Wl,-dll -Wl,--subsystem,$(SUBSYSTEM)
else ifeq ($(ARCH),arm)
  GNUEFI_ARCH   = arm
  GCC_ARCH      = arm
  CPU_ARCH      = arm
  CROSS_COMPILE = $(GCC_ARCH)-linux-gnueabihf-
  EP_PREFIX     =
  CFLAGS        = -marm -fpic -fshort-wchar -Wno-pointer-to-int-cast
  LDFLAGS       = -Wl,--no-wchar-size-warning -Wl,--defsym=EFI_SUBSYSTEM=$(SUBSYSTEM)
  CRT0_LIBS     = -lgnuefi
else ifeq ($(ARCH),aa64)
  GNUEFI_ARCH   = aarch64
  GCC_ARCH      = aarch64
  CPU_ARCH      = arm64
  CRT0_ARCH     = aarch64
  CROSS_COMPILE = $(GCC_ARCH)-linux-gnu-
  EP_PREFIX     =
  CFLAGS        = -fpic -fshort-wchar -Wno-pointer-to-int-cast
  LDFLAGS       = -Wl,--no-wchar-size-warning -Wl,--defsym=EFI_SUBSYSTEM=$(SUBSYSTEM)
  CRT0_LIBS     = -lgnuefi
else ifeq ($(ARCH),riscv64)
  GNUEFI_ARCH   = riscv64
  GCC_ARCH      = riscv64
  CPU_ARCH      = riscv64
  CRT0_ARCH     = riscv64
  CROSS_COMPILE = $(GCC_ARCH)-linux-gnu-
  EP_PREFIX     =
  CFLAGS        = -fpic -fshort-wchar -Wno-pointer-to-int-cast
  LDFLAGS       = -Wl,--defsym=EFI_SUBSYSTEM=$(SUBSYSTEM)
  CRT0_LIBS     = -lgnuefi
else ifeq ($(ARCH),loongarch64)
  GNUEFI_ARCH   = loongarch64
  GCC_ARCH      = loongarch64-unknown
  CPU_ARCH      = loongarch64
  CRT0_ARCH     = loongarch64
  CROSS_COMPILE = $(GCC_ARCH)-linux-gnu-
  EP_PREFIX     =
  CFLAGS        = -fpic -fshort-wchar -Wno-pointer-to-int-cast
  LDFLAGS       = -Wl,--defsym=EFI_SUBSYSTEM=$(SUBSYSTEM)
  CRT0_LIBS     = -lgnuefi
endif

TOPDIR         := $(dir $(lastword $(MAKEFILE_LIST)))
GNUEFI_DIR      = $(TOPDIR)/gnu-efi
GNUEFI_LIBS     = lib
GRUB_DIR        = $(TOPDIR)/grub
SRC_DIR         = $(TOPDIR)/src
GNUEFI_INC      = $(GNUEFI_DIR)/inc
GNUEFI_LIBDIR   = $(GNUEFI_DIR)/$(GNUEFI_ARCH)/lib
GNUEFI_LIB      = $(GNUEFI_LIBDIR)/libefi.a

# If the compiler produces an elf binary, we need to fiddle with a PE crt0
ifneq ($(CRT0_LIBS),)
  CRT0_DIR      = $(GNUEFI_DIR)/$(GNUEFI_ARCH)/gnuefi
  LDFLAGS      += -L$(CRT0_DIR) -T $(GNUEFI_DIR)/gnuefi/elf_$(CRT0_ARCH)_efi.lds $(CRT0_DIR)/crt0-efi-$(CRT0_ARCH).o
  GNUEFI_LIBS  += gnuefi
endif

# SYSTEMROOT is only defined on Windows systems
ifneq ($(SYSTEMROOT),)
  # MinGW on Windows doesn't use (tuple)-ar but (tuple)-gcc-ar
  # so we remove the cross compiler tuple altogether
  CROSS_COMPILE =
endif

CC             := $(CROSS_COMPILE)gcc
OBJCOPY        := $(CROSS_COMPILE)objcopy
CFLAGS         += -fno-stack-protector -Wshadow -Wall -Wunused -Werror-implicit-function-declaration
CFLAGS         += -Wno-pointer-sign    # -funsigned-char does not work :(
CFLAGS         += -I$(GNUEFI_DIR)/inc -I$(GNUEFI_DIR)/inc/$(GNUEFI_ARCH) -I$(GNUEFI_DIR)/inc/protocol
CFLAGS         += -DCONFIG_$(GNUEFI_ARCH) -D__MAKEWITH_GNUEFI -DGNU_EFI_USE_MS_ABI -DNO_RAID6_RECOVERY
LDFLAGS        += -L$(GNUEFI_DIR)/$(GNUEFI_ARCH)/lib -e $(EP_PREFIX)efi_main
LDFLAGS        += -s -Wl,-Bsymbolic -nostdlib -shared
LIBS            = -lefi $(CRT0_LIBS)

ifeq (, $(shell which $(CC)))
  $(error The selected compiler ($(CC)) was not found)
endif

GCCVERSION     := $(shell $(CC) -dumpversion | sed -e 's/-win32/.0/' | cut -f1 -d.)
GCCMINOR       := $(shell $(CC) -dumpversion | sed -e 's/-win32/.0/' | cut -f2 -d.)
GCCMACHINE     := $(shell $(CC) -dumpmachine)
GCCNEWENOUGH   := $(shell ( [ $(GCCVERSION) -gt "4" ]        \
                          || ( [ $(GCCVERSION) -eq "4" ]     \
                              && [ $(GCCMINOR) -ge "7" ] ) ) \
                        && echo 1)
ifneq ($(GCCNEWENOUGH),1)
  $(error You need GCC 4.7 or later)
endif

ifneq ($(GCC_ARCH),$(findstring $(GCC_ARCH), $(GCCMACHINE)))
  $(error The selected compiler ($(CC)) is not set for $(TARGET))
endif

ifdef DRIVERNAME
  CFLAGS       += -DDRIVERNAME=$(DRIVERNAME)
  CFLAGS       += -I$(GRUB_DIR) -I$(GRUB_DIR)/include -I$(GRUB_DIR)/grub-core/lib/minilzo -I$(GRUB_DIR)/grub-core/lib/zstd
  CFLAGS       += -DGRUB_FILE=\"$(subst $(srcdir)/,,$<)\"
  LDFLAGS      += -shared -L$(GNUEFI_LIBDIR) -L$(GRUB_DIR) -e $(EP_PREFIX)InitializeDriver
  LIBS         += -lgrub -lefi

  OBJS          = utf8.o path.o missing.o logging.o grub_file.o this.o file.o driver.o \
                  $(GRUB_DIR)/grub-core/fs/fshelp.o $(GRUB_DIR)/grub-core/$(FSDIR)/$(DRIVERNAME).o
  DRIVER        = $(DRIVERNAME)_$(ARCH)
endif
ifdef EXTRAOBJS
  OBJS         += $(addprefix $(GRUB_DIR)/grub-core/$(FSDIR)/,$(EXTRAOBJS))
endif
ifdef EXTRAMODULE
  CFLAGS       += -DEXTRAMODULE=$(EXTRAMODULE)
  OBJS         += $(GRUB_DIR)/grub-core/$(EXTRAMODULEDIR)/$(EXTRAMODULE).o
endif
ifdef EXTRAMODULE2
  CFLAGS       += -DEXTRAMODULE2=$(EXTRAMODULE2)
  OBJS         += $(GRUB_DIR)/grub-core/$(EXTRAMODULE2DIR)/$(EXTRAMODULE2).o
endif
ifdef OBJS
  # http://scottmcpeak.com/autodepend/autodepend.html
  -include $(OBJS:.o=.d)
endif

# Set verbose or nonverbose output similarly to automake's silent rules.
# Default is nonverbose, but, just like with automake, it can be disabled
# with: 'make V=1'
ifneq ($(V),1)
  HIDE=@
  ECHO=echo
else
  HIDE=
  ECHO=true
endif

$(GNUEFI_LIB):
	$(MAKE) -C$(GNUEFI_DIR) CROSS_COMPILE=$(CROSS_COMPILE) ARCH=$(GNUEFI_ARCH) $(GNUEFI_LIBS)

.PHONY: driver clean.common clean.driver

driver: $(DRIVER).efi

$(DRIVER).efi: $(OBJS)
	@$(ECHO) "  LD       $(notdir $@)"
ifeq ($(CRT0_LIBS),)
	$(HIDE)$(CC) $(LDFLAGS) $(OBJS) -o $(DRIVER).efi $(LIBS)
else
	$(HIDE)$(CC) $(LDFLAGS) $(OBJS) -o $(DRIVER).elf $(LIBS)
	$(HIDE)$(OBJCOPY) -j .text -j .sdata -j .data -j .dynamic -j .dynsym -j .rel* \
	                  -j .rela* -j .reloc -j .eh_frame -O binary $(DRIVER).elf $@
	$(HIDE)rm -f $(DRIVER).elf
endif
	@chmod a-x $(DRIVER).efi

%.o: %.c
	@$(ECHO) "  CC       $(notdir $@)"
	$(HIDE)$(CC) $(CFLAGS) -ffreestanding -c $< -o $@
	$(HIDE)$(CC) -MM $(CFLAGS) $*.c > $*.d

clean.common:
	$(MAKE) -C$(GNUEFI_DIR) ARCH=$(GNUEFI_ARCH) clean
	$(shell find . | grep "\.d$$" | xargs rm -f 2>/dev/null)

clean.driver:
	rm -f $(GRUB_DIR)/grub-core/fs/*.o $(GRUB_DIR)/grub-core/fs/*.d $(GRUB_DIR)/grub-core/io/*.o $(GRUB_DIR)/grub-core/io/*.d \
	$(GRUB_DIR)/grub-core/fs/zfs/*.o $(GRUB_DIR)/grub-core/fs/zfs/*.d $(SRC_DIR)/*.o $(SRC_DIR)/*.d $(SRC_DIR)/*.so $(SRC_DIR)/*.efi