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# ============================================================================
# boot/Makefile - UEFI Loader Build
# Produces: $(RESULT_DIR)/BOOTX64.EFI (x86) or BOOTAA64.EFI(aarch64)
#
# Strategy: Compile with Clang targeting Windows PE32+, link with lld-link.
# This produces a native .efi (PE32+) directly - no objcopy needed.
# TODO: create PE header in the code, and get rid from clang dependency
# ============================================================================
include ../config.mk
-include ../config_generated.mk
COMMON_SRC := \
common/efi_loader.cpp \
common/efi_elf_parser.cpp
ARCH_SRC := \
$(ARCH)/entry.cpp
SRC := $(COMMON_SRC) $(ARCH_SRC)
OBJ := $(patsubst %.cpp,%.o,$(SRC))
# ── UEFI-specific flags ────────────────────────────────────────────────────
# Compile as PE/COFF using Clang's Windows target with -fshort-wchar.
ifeq ($(ARCH),x86_64)
EFI_TARGET := x86_64-unknown-windows
EFI_BINARY := BOOTX64.EFI
EFI_MFLAGS := -mno-red-zone #https://os.phil-opp.com/red-zone/#:~:text=Disable%20the%20Red%20Zone%20%7C%20Writing%20an%20OS%20in%20Rust
else ifeq ($(ARCH),aarch64)
EFI_TARGET := aarch64-unknown-windows
EFI_BINARY := BOOTAA64.EFI
EFI_MFLAGS :=
endif
EFI_CXXFLAGS := \
-target $(EFI_TARGET) \
-std=c++23 \
-ffreestanding \
-fno-exceptions \
-fno-rtti \
-fno-stack-protector \
-fno-threadsafe-statics \
-fno-use-cxa-atexit \
-fshort-wchar \
-nostdlib \
-Wall -Wextra \
-Werror=return-type \
-O2 -g \
$(EFI_MFLAGS) \
-I../include \
-include $(PROJECT_ROOT)/include/kernel/config.h \
-DEFI_ARCH_$(shell echo $(ARCH) | tr a-z A-Z)
EFI_LDFLAGS := \
-flavor link \
-subsystem:efi_application \
-entry:efi_main \
-nodefaultlib
# ── Targets ─────────────────────────────────────────────────────────────────
.PHONY: all clean
all: $(RESULT_DIR)/$(EFI_BINARY)
# Link directly to PE32+ .efi
$(RESULT_DIR)/$(EFI_BINARY): $(OBJ)
@mkdir -p $(dir $@)
@echo " LINK $@"
@lld-link $(EFI_LDFLAGS) $(OBJ) -out:$@
%.o: %.cpp
@echo " CXX $<"
@$(CXX) $(EFI_CXXFLAGS) -c $< -o $@
clean:
find . -name '*.o' -delete
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