DO		!= echo > deps.mk

CFLAGS		= -fno-pie -ggdb3 -ffreestanding -nostdlib
DEPFLAGS	= -MT $@ -MMD -MP -MF $@.d

all: apos.bin

ARCH		?= riscv
CROSS_COMPILE	?= riscv64-unknown-elf-

# Common programs
CC		:= gcc
AR		:= ar
CPP		:= cpp
OBJCOPY		?= objcopy
OBJCOPY_FLAGS	?= -Obinary

KERNEL_SOURCES	:=
INIT_SOURCES	:=
CLEANUP		:= build deps.mk kernel.* init.* apos.bin
CLEANUP_CMD	:=

include arch/$(ARCH)/source.mk

INCLUDE_FLAGS	:= -Iinclude -Iarch/$(ARCH)/include

COMPILE		= $(CROSS_COMPILE)$(CC) $(CFLAGS) $(DEPFLAGS) $(INCLUDE_FLAGS)
GENLINK		= $(CROSS_COMPILE)$(CPP) $(DEPFLAGS) $(INCLUDE_FLAGS)
STRIPLINK	= sed -n '/^[^\#]/p'

KERNEL_LINK	:= arch/$(ARCH)/conf/kernel-link
INIT_LINK	:= arch/$(ARCH)/conf/init-link

KERNEL_OBJECTS	!= ./scripts/gen-deps --kern "$(KERNEL_SOURCES)"
INIT_OBJECTS	!= ./scripts/gen-deps --init "$(INIT_SOURCES)"
KERNEL_LD	!= ./scripts/gen-deps --link "$(KERNEL_LINK).S"
INIT_LD		!= ./scripts/gen-deps --link "$(INIT_LINK).S"

include deps.mk

apos.bin: kernel.elf init.elf
	$(CROSS_COMPILE)$(OBJCOPY) $(OBJCOPY_FLAGS) kernel.elf kernel.bin
	$(CROSS_COMPILE)$(OBJCOPY) $(OBJCOPY_FLAGS) init.elf init.bin
	cat init.bin kernel.bin > $@

kernel.elf: $(KERNEL_OBJECTS) $(KERNEL_LD)
	$(COMPILE) -T$(KERNEL_LD) $(KERNEL_OBJECTS) -o $@

init.elf: $(INIT_OBJECTS) $(INIT_LD)
	$(COMPILE) -T$(INIT_LD) $(INIT_OBJECTS) -o $@

clean:
	$(CLEANUP_CMD)
	$(RM) -r $(CLEANUP)