CC = riscv64-unknown-elf-gcc
CFLAGS = -nostdlib -fno-builtin -mcmodel=medany -march=rv32ima -mabi=ilp32

OBJ = \
start.s \
sys.s \
lib.c \
timer.c \
task.c \
os.c \
user.c \
trap.c

QEMU = qemu-system-riscv32
QFLAGS = -nographic -smp 4 -machine virt -bios none

OBJDUMP = riscv64-unknown-elf-objdump

all: os.elf

os.elf: $(OBJ)
	$(CC) $(CFLAGS) -T os.ld -o os.elf $^

qemu: $(TARGET)
	@qemu-system-riscv32 -M ? | grep virt >/dev/null || exit
	@echo "Press Ctrl-A and then X to exit QEMU"
	$(QEMU) $(QFLAGS) -kernel os.elf

clean:
	rm -f *.elf