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|
.POSIX:
.SUFFIXES:
.PHONY: clean run
RPI_VERSION ?= 3
# Compiler.
AS := aarch64-elf-as
CC := aarch64-elf-gcc
LD := aarch64-elf-ld
OBJCOPY := aarch64-elf-objcopy
# Paths.
SRC_DIR := src
BUILD_DIR := build
# Output files.
ELF := $(BUILD_DIR)/kernel8.elf
IMG := $(BUILD_DIR)/kernel8.img
# Bootstrapping files.
OBJ_START = $(BUILD_DIR)/start.o
OBJ_MAIN = $(BUILD_DIR)/main.o
SRC_LINK = $(SRC_DIR)/linker.ld
CFLAGS := -Wall -ffreestanding -nostartfiles -O2 -nostdlib -lgcc -mgeneral-regs-only -fno-stack-protector
CFLAGS += -DRPI_VERSION=$(RPI_VERSION)
AFLAGS :=
LDFLAGS :=
default: $(IMG)
$(BUILD_DIR)/%.o: $(SRC_DIR)/%.s
$(AS) $(AFLAGS) -o $@ -c $<
$(BUILD_DIR)/%.o: $(SRC_DIR)/%.c
$(CC) $(CFLAGS) -o $@ -c $<
$(IMG): $(BUILD_DIR) $(ELF)
$(OBJCOPY) $(ELF) -O binary $(IMG)
$(ELF): $(OBJ_START) $(OBJ_MAIN)
$(LD) $(LDFLAGS) -T $(SRC_LINK) -o $(ELF) $(OBJ_START) $(OBJ_MAIN)
clean:
rm -rf $(BUILD_DIR)
$(BUILD_DIR):
mkdir -p $(BUILD_DIR)
run: $(IMG)
qemu-system-aarch64 -M raspi3 -kernel $(IMG) -serial null -serial stdio
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