# environment vaiables read:
# BOARD = {ml402, denano}
# TLB = {no, yes}
# ENDIANESS = {eb, el}
BOARD ?= ml402
TLB ?= no
ENDIANESS ?= eb

		
ifeq ($(ENDIANESS),el)
  ENDIAN_FLAGS=-EL
else
  ENDIAN_FLAGS=-EB
endif
		  
CFLAGS=$(ENDIAN_FLAGS) -g -msoft-float -O2 -march=r3000 -I. -Iboards/$(BOARD) -D$(BOARD) -DWITH_ROM_GDBSTUB

ifeq ($(TLB),yes)
  CFLAGS+=-DSYS_IO_BASE=0xAC000000 -DSDRAM_BASE=0x80000000 -DFLASH_BASE_IO=0xA4000000 -DFLASH_BASE_MEM=0x88000000
else
  CFLAGS+=-DSYS_IO_BASE=0xA0000000 -DSDRAM_BASE=0x40000000 -DFLASH_BASE_IO=0xA4000000 -DFLASH_BASE_MEM=0x00000000
endif

BUILD_DIR=./build/$(BOARD)/$(ENDIANESS)

AS=mips-elf-as
AR=mips-elf-ar
CC=mips-elf-gcc
LD=mips-elf-ld
OBJDUMP=mips-elf-objdump
OBJCOPY=mips-elf-objcopy
FLASHGEN=flashgen

OBJS-ml402=$(addprefix $(BUILD_DIR)/, libsys.o xcpt.o syscalls.o cop0.o irq.o mips_dbg.o mips_dis.o mips_ps2.o mips_gfx.o console.o screen.o uart.o board.o gpio.o)
OBJS-denano=$(addprefix $(BUILD_DIR)/, libsys.o xcpt.o syscalls.o cop0.o irq.o mips_dbg.o mips_dis.o console.o uart.o board.o gdb_stub.o)

all: $(BUILD_DIR) $(BUILD_DIR)/libsys.a
	
$(BUILD_DIR)/%.o : %.c
	$(CC) $(CFLAGS) -G 0 -c -o $@ $<

$(BUILD_DIR)/%.o : %.S
	$(CC) $(CFLAGS) -G 0 -c -o $@ $<

$(BUILD_DIR)/board.o : boards/$(BOARD)/board.c
	$(CC) $(CFLAGS) -G 0 -c -o $@ $<

$(BUILD_DIR)/libsys.a: $(OBJS-$(BOARD))
	$(AR) -r $(BUILD_DIR)/libsys.a $(OBJS-$(BOARD))
	$(CC) $(CFLAGS) -G 0 -c -o $(BUILD_DIR)/startup.o startup.S
	$(CC) $(CFLAGS) -G 0 -c -o $(BUILD_DIR)/kernel.o kernel.S

$(BUILD_DIR):
	mkdir -p $(BUILD_DIR)

clean:
	rm -rf $(BUILD_DIR)/*.a $(BUILD_DIR)/*.o > /dev/null

mrproper:
	rm -rf $(BUILD_DIR)