CROSS = aarch64-none-elf-

CC = $(CROSS)gcc
AS = $(CROSS)as
LD = $(CROSS)ld
OBJCOPY = $(CROSS)objcopy

CFLAGS = -O2 -ffreestanding -nostdlib -Wall -Wextra -Iinclude include/
LDFLAGS = -T src/boot/linker.ld

SRC = src
BUILD = build

# List all C source files here (update as needed)
SOURCES_C = $(SRC)/renderer.c   $(SRC)/font_pack.c $(SRC)/main.c 

# List assembler source files
SOURCES_ASM = $(SRC)/boot/boot.s

# Object files (one per source file)
OBJ_C = $(patsubst $(SRC)/%.c,$(BUILD)/%.o,$(SOURCES_C))
OBJ_ASM = $(patsubst $(SRC)/%.s,$(BUILD)/%.o,$(SOURCES_ASM))

TARGET_ELF = $(BUILD)/kernel.elf
TARGET_IMG = $(BUILD)/kernel8.img

.PHONY: all clean run

all: $(TARGET_IMG)

# Create build directory if it does not exist
$(BUILD):
	mkdir -p $(BUILD)
	mkdir -p $(BUILD)/boot

# Assemble assembly sources
$(BUILD)/%.o: $(SRC)/%.s | $(BUILD)
	$(AS) $< -o $@

# Compile C sources
$(BUILD)/%.o: $(SRC)/%.c | $(BUILD)
	$(CC) $(CFLAGS) -c $< -o $@

# Link all object files into ELF kernel
$(TARGET_ELF): $(OBJ_ASM) $(OBJ_C)
	$(LD) $(LDFLAGS) $^ -o $@

# Convert ELF to raw binary image
$(TARGET_IMG): $(TARGET_ELF)
	$(OBJCOPY) $< -O binary $@

clean:
	rm -rf $(BUILD)

# Run QEMU emulator for Raspberry Pi 3 with serial output redirected to terminal
run: $(TARGET_IMG)
	qemu-system-aarch64 -M raspi3b -serial stdio -kernel $(TARGET_IMG)