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55 lines
1.5 KiB
55 lines
1.5 KiB
BUILD_DIR ?= ./build
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SRC_DIRS ?= ./src
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BOOTLOADER_DIR ?= ./asm/boot
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SRCS := $(shell find $(SRC_DIRS) -name *.cpp -or -name *.c -or -name *.s)
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OBJS := $(SRCS:%=$(BUILD_DIR)/%.o)
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DEPS := $(OBJS:.o=.d)
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INC_DIRS := $(shell find $(SRC_DIRS) -type d)
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INC_FLAGS := $(addprefix -I,$(INC_DIRS))
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CPPFLAGS ?= $(INC_FLAGS) -MMD -MP -g -std=c++17 -Wall
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# Default makefile target
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all: os-image
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run: os-image
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qemu-system-x86_64 -hda build/os-image.bin
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# Builds a bootable x86 image that loads the kernel
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os-image: $(BUILD_DIR)/kernel.bin $(BUILD_DIR)/bootloader.bin
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cat $(BUILD_DIR)/bootloader.bin $(BUILD_DIR)/kernel.bin > build/os-image.bin
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# Builds the binary kernel image with the entry prefix
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$(BUILD_DIR)/kernel.bin: $(BUILD_DIR)/kernel_entry.o $(OBJS)
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ld -m elf_i386 -o $@ -Ttext 0x1000 --oformat binary $(BUILD_DIR)/kernel_entry.o $(OBJS)
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# Builds the x86 -> 32-bit bootloader
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$(BUILD_DIR)/bootloader.bin: $(BOOTLOADER_DIR)/main16.asm
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cd $(BOOTLOADER_DIR); nasm -f bin -o ../../build/bootloader.bin main16.asm
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# Builds the kernel entry object file
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$(BUILD_DIR)/kernel_entry.o: asm/kasm.asm
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$(MKDIR_P) $(dir $@)
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cd asm; nasm kasm.asm -f elf -o ../build/kernel_entry.o
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# Build C++ sources
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$(BUILD_DIR)/%.cpp.o: %.cpp
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$(MKDIR_P) $(dir $@)
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g++ $(CPPFLAGS) $(CXXFLAGS) -m32 -ffreestanding -c $< -o $@ -fno-pie
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# Build C sources
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$(BUILD_DIR)/%.c.o: %.c
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$(MKDIR_P) $(dir $@)
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gcc $(CFLAGS) $(CXXFLAGS) -m32 -ffreestanding -c $< -o $@ -fno-pie
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# Clean all build objects
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.PHONY: clean
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clean:
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$(RM) -rf $(BUILD_DIR)
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-include $(DEPS)
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MKDIR_P ?= mkdir -p
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