TOPDIR =  $(shell pwd)
ARCH = x86
NAME = metalsvm
LWIPDIRS = lwip/src/api lwip/src/core lwip/src/core/ipv4 lwip/src/netif
DRIVERDIRS = drivers/net drivers/char
KERNDIRS = libkern kernel mm fs arch/$(ARCH)/kernel arch/$(ARCH)/mm arch/$(ARCH)/scc $(LWIPDIRS) $(DRIVERDIRS)
SUBDIRS = $(KERNDIRS)

CC_FOR_TARGET=i386-unknown-linux-gnu-gcc
CXX_FOR_TARGET=i386-unknown-linux-gnu-g++
GCC_FOR_TARGET=i386-unknown-linux-gnu-gcc
AR_FOR_TARGET=i386-unknown-linux-gnu-ar
AS_FOR_TARGET=i386-unknown-linux-gnu-as
LD_FOR_TARGET=i386-unknown-linux-gnu-ld
NM_FOR_TARGET=i386-unknown-linux-gnu-nm
OBJDUMP_FOR_TARGET=i386-unknown-linux-gnu-objdump
OBJCOPY_FOR_TARGET=i386-unknown-linux-gnu-objcopy
RANLIB_FOR_TARGET=i386-unknown-linux-gnu-ranlib
STRIP_FOR_TARGET=i386-unknown-linux-gnu-strip
READELF_FOR_TARGET=i386-unknown-linux-gnu-readelf
NASM = nasm
EMU=qemu
GDB=gdb

MAKE = make
NASMFLAGS = -felf32 -g
INCLUDE = -I$(TOPDIR)/include -I$(TOPDIR)/arch/$(ARCH)/include -I$(TOPDIR)/lwip/src/include -I$(TOPDIR)/lwip/src/include/ipv4 -I$(TOPDIR)/drivers
# Compiler options for final code
CFLAGS = -g -m32 -march=i586 -Wall -O2 -fno-zero-initialized-in-bss -fno-builtin -fstrength-reduce -fomit-frame-pointer -finline-functions -nostdinc $(INCLUDE) 
# Compiler options for debuuging
#CFLAGS = -g -O -m32 -march=i586 -Wall -fno-zero-initialized-in-bss -fno-builtin -DWITH_FRAME_POINTER -nostdinc $(INCLUDE) 
ARFLAGS = rsv
RM = rm -rf
LDFLAGS = -T link.ld -z max-page-size=4096 --defsym __BUILD_DATE=$(shell date +'%Y%m%d') --defsym __BUILD_TIME=$(shell date +'%H%M%S')
STRIP_DEBUG = --strip-debug
KEEP_DEBUG = --only-keep-debug

# Prettify output
V = 0
ifeq ($V,0)
	Q = @
	P = > /dev/null
endif

default: all
	
all: newlib tools $(NAME).elf
	
newlib:
	$(MAKE) ARCH=$(ARCH) LDFLAGS="-m32" CFLAGS="-m32 -O2 -march=i586 " NASMFLAGS="$(NASMFLAGS)" CC_FOR_TARGET=$(CC_FOR_TARGET) \
		CXX_FOR_TARGET=$(CXX_FOR_TARGET) \
		GCC_FOR_TARGET=$(GCC_FOR_TARGET) \
		AR_FOR_TARGET=$(AR_FOR_TARGET) \
		AS_FOR_TARGET=$(AS_FOR_TARGET) \
		LD_FOR_TARGET=$(LD_FOR_TARGET) \
		NM_FOR_TARGET=$(NM_FOR_TARGET) \
		OBJDUMP_FOR_TARGET=$(OBJDUMP_FOR_TARGET) \
		OBJCOPY_FOR_TARGET=$(OBJCOPY_FOR_TARGET) \
		RANLIB_FOR_TARGET=$(RANLIB_FOR_TARGET) \
		STRIP_FOR_TARGET=$(STRIP_FOR_TARGET) \
		READELF_FOR_TARGET=$(READELF_FOR_TARGET) -C newlib

tools:
	$(MAKE) -C tools

$(NAME).elf:
	$Q$(LD_FOR_TARGET) $(LDFLAGS) -o $(NAME).elf $^
	@echo [OBJCOPY] $(NAME).sym
	$Q$(OBJCOPY_FOR_TARGET) $(KEEP_DEBUG) $(NAME).elf $(NAME).sym
	@echo [OBJCOPY] $(NAME).elf
	$Q$(OBJCOPY_FOR_TARGET) $(STRIP_DEBUG) $(NAME).elf

qemu: newlib tools $(NAME).elf
	qemu -smp 2 -net nic,model=rtl8139 -net user,hostfwd=tcp::12345-:7 -net dump -kernel metalsvm.elf -initrd tools/initrd.img

qemudbg: newlib tools $(NAME).elf
	qemu -S -s -smp 2 -net nic,model=rtl8139 -net user,hostfwd=tcp::12345-:7 -net dump -kernel metalsvm.elf -initrd tools/initrd.img

gdb: $(NAME).elf
	make qemudbg > /dev/null &
	$(GDB) -x script.gdb

clean:
	$Q$(RM) $(NAME).elf $(NAME).sym *~
	$Q$(MAKE) -C tools clean
	@echo Cleaned.

veryclean: clean
	$Q$(MAKE) -C newlib veryclean
	@echo Very cleaned

#depend:
#	for i in $(SUBDIRS); do $(MAKE) -k -C $$i depend; done

%.o : %.c
	@echo [CC] $@
	$Q$(CC_FOR_TARGET) -c -D__KERNEL__ $(CFLAGS) -o $@ $<
	@echo [DEP] $*.dep
	$Q$(CC_FOR_TARGET) -MF $*.dep -MT $*.o -MM $(CFLAGS) $<


%.o : %.asm
	@echo [ASM] $@
	$Q$(NASM) $(NASMFLAGS) -o $@ $<

.PHONY: default all clean emu gdb newlib tools
 
include $(addsuffix /Makefile,$(SUBDIRS))