153 lines
4.4 KiB
Makefile
153 lines
4.4 KiB
Makefile
# Makefile for UEFI Operating System
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# Architecture
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ARCH = x86_64
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# Compiler and tools
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CC = gcc
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LD = ld
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OBJCOPY = objcopy
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# Directories
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SRC_DIR = .
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BUILD_DIR = build
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EFI_DIR = $(BUILD_DIR)/EFI/BOOT
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IMAGE_DIR = $(BUILD_DIR)/image
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# GNU-EFI paths (common locations)
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EFI_INC = /usr/include/efi
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EFI_INCLUDES = -I$(EFI_INC) -I$(EFI_INC)/$(ARCH) -I$(EFI_INC)/protocol
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EFI_LDS = /usr/lib/elf_$(ARCH)_efi.lds
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EFI_CRT_OBJS = /usr/lib/crt0-efi-$(ARCH).o
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EFI_LIB_PATHS = -L/usr/lib
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# Compiler flags
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CFLAGS = -ffreestanding -fno-stack-protector -fpic \
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-fshort-wchar -mno-red-zone -Wall -Wextra \
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$(EFI_INCLUDES) -DEFI_FUNCTION_WRAPPER
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# Linker flags
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LDFLAGS = -nostdlib -znocombreloc -T $(EFI_LDS) -shared \
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-Bsymbolic $(EFI_LIB_PATHS) $(EFI_CRT_OBJS)
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# Libraries
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LIBS = -lefi -lgnuefi
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# Target
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TARGET = BOOTX64.EFI
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TARGET_SO = bootx64.so
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OBJ = $(BUILD_DIR)/main.o
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# QEMU settings
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QEMU = qemu-system-x86_64
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# Try to find OVMF firmware (different locations on different distros)
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OVMF_CODE := $(shell \
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if [ -f /usr/share/OVMF/OVMF_CODE_4M.fd ]; then \
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echo /usr/share/OVMF/OVMF_CODE_4M.fd; \
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elif [ -f /usr/share/OVMF/OVMF_CODE.fd ]; then \
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echo /usr/share/OVMF/OVMF_CODE.fd; \
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elif [ -f /usr/share/qemu/OVMF_CODE.fd ]; then \
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echo /usr/share/qemu/OVMF_CODE.fd; \
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elif [ -f /usr/share/edk2-ovmf/x64/OVMF_CODE.fd ]; then \
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echo /usr/share/edk2-ovmf/x64/OVMF_CODE.fd; \
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else \
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echo /usr/share/OVMF/OVMF_CODE.fd; \
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fi)
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OVMF_VARS_TEMPLATE := $(shell \
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if [ -f /usr/share/OVMF/OVMF_VARS_4M.fd ]; then \
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echo /usr/share/OVMF/OVMF_VARS_4M.fd; \
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elif [ -f /usr/share/OVMF/OVMF_VARS.fd ]; then \
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echo /usr/share/OVMF/OVMF_VARS.fd; \
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elif [ -f /usr/share/qemu/OVMF_VARS.fd ]; then \
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echo /usr/share/qemu/OVMF_VARS.fd; \
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elif [ -f /usr/share/edk2-ovmf/x64/OVMF_VARS.fd ]; then \
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echo /usr/share/edk2-ovmf/x64/OVMF_VARS.fd; \
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else \
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echo /usr/share/OVMF/OVMF_VARS.fd; \
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fi)
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QEMU_FLAGS = -machine q35 \
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-drive if=pflash,format=raw,readonly=on,file=$(OVMF_CODE) \
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-drive if=pflash,format=raw,file=$(BUILD_DIR)/OVMF_VARS.fd \
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-drive format=raw,file=fat:rw:$(BUILD_DIR) \
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-net none \
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-nographic
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# Phony targets
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.PHONY: all clean run setup install-deps
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# Default target
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all: setup $(EFI_DIR)/$(TARGET)
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# Create necessary directories
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setup:
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@mkdir -p $(BUILD_DIR)
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@mkdir -p $(EFI_DIR)
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@mkdir -p $(IMAGE_DIR)
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# Compile source files
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$(BUILD_DIR)/%.o: $(SRC_DIR)/%.c
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@echo "Compiling $<..."
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$(CC) $(CFLAGS) -c $< -o $@
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# Link to create shared object
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$(BUILD_DIR)/$(TARGET_SO): $(OBJ)
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@echo "Linking $@..."
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$(LD) $(LDFLAGS) $(OBJ) -o $@ $(LIBS)
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# Convert to EFI application
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$(EFI_DIR)/$(TARGET): $(BUILD_DIR)/$(TARGET_SO)
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@echo "Creating EFI application..."
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$(OBJCOPY) -j .text -j .sdata -j .data -j .dynamic \
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-j .dynsym -j .rel -j .rela -j .reloc \
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--target=efi-app-$(ARCH) $< $@
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@echo "Build complete: $@"
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# Run with QEMU
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run: all
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@echo "Starting QEMU..."
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@echo "Using OVMF firmware: $(OVMF_CODE)"
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@if [ ! -f $(BUILD_DIR)/OVMF_VARS.fd ]; then \
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echo "Creating OVMF_VARS.fd from template..."; \
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cp $(OVMF_VARS_TEMPLATE) $(BUILD_DIR)/OVMF_VARS.fd 2>/dev/null || \
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dd if=/dev/zero of=$(BUILD_DIR)/OVMF_VARS.fd bs=1M count=64 2>/dev/null; \
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fi
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@echo "================================================"
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@echo "QEMU is starting in nographic mode"
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@echo "To exit QEMU: Press Ctrl+A, then X"
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@echo "In the OS: Press 'q' to shutdown"
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@echo "================================================"
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$(QEMU) $(QEMU_FLAGS)
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# Clean build artifacts
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clean:
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@echo "Cleaning build directory..."
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rm -rf $(BUILD_DIR)
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@echo "Clean complete."
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# Install dependencies (for Debian/Ubuntu)
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install-deps:
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@echo "Installing dependencies..."
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sudo apt-get update
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sudo apt-get install -y gnu-efi qemu-system-x86 ovmf gcc binutils make
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@echo "Dependencies installed."
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# Help target
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help:
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@echo "UEFI Operating System Makefile"
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@echo ""
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@echo "Targets:"
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@echo " all - Build the UEFI application (default)"
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@echo " run - Build and run with QEMU"
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@echo " clean - Remove build artifacts"
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@echo " install-deps - Install required dependencies (Debian/Ubuntu)"
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@echo " help - Display this help message"
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@echo ""
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@echo "Usage:"
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@echo " make # Build the OS"
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@echo " make run # Build and run in QEMU"
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@echo " make clean # Clean build files"
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@echo " make install-deps # Install dependencies"
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