CROSS_COMPILE = arm-none-eabi-
AS = $(CROSS_COMPILE)as
CC = $(CROSS_COMPILE)gcc
LD = $(CROSS_COMPILE)ld
OBJCOPY = $(CROSS_COMPILE)objcopy

CFLAGS = -Wall -mcpu=arm926ej-s -nostdlib -ffreestanding -I.

.SUFFIXES: .s .o .c

%.o:    %.c
	$(CC) $(CFLAGS) -c $< -o $@

%.o:    %.s
	$(AS) -mcpu=arm926ej-s $< -o $@

ASM_S_FILES = $(wildcard system/asm/*.s)
ASM_O_FILES = $(ASM_S_FILES:.s=.o)

CFILES = $(wildcard devices/*.c) $(wildcard devices/*/*.c) $(wildcard system/*.c) $(wildcard system/*/*.c)
COFILES  = $(CFILES:.c=.o)
OFILES = $(ASM_O_FILES) $(COFILES)

all: kernel.bin

kernel.elf: ${OFILES}
	$(LD) -T boot.ld -o $@ $^

kernel.bin: kernel.elf
	$(OBJCOPY) -O binary $< $@

clean:
	rm -f *.o */*.o */*/*.o *.elf *.bin
	
run: kernel.bin
	qemu-system-arm -M versatilepb -m 128M -nographic -kernel kernel.bin