TOPDIR = $(shell pwd)
ARCH = x86
# For 64bit support, you have define BIT as 64
BIT=32
NAME = metalsvm
LWIPDIRS = lwip/src/arch lwip/src/api lwip/src/core lwip/src/core/ipv4 lwip/src/netif
DRIVERDIRS = drivers/net drivers/char
KERNDIRS = libkern kernel mm fs apps arch/$(ARCH)/kernel arch/$(ARCH)/mm arch/$(ARCH)/scc $(LWIPDIRS) $(DRIVERDIRS)
SUBDIRS = $(KERNDIRS)
STACKPROT = -fno-stack-protector

# Set your own cross compiler tool chain prefix here
CROSSCOMPREFIX =

# Uncomment both lines if compiling for the SCC!
#CROSSCOMPREFIX = i386-unknown-linux-gnu-
#STACKPROT =

CC_FOR_TARGET = $(CROSSCOMPREFIX)gcc
CXX_FOR_TARGET = $(CROSSCOMPREFIX)g++
GCC_FOR_TARGET = $(CROSSCOMPREFIX)gcc
CPP_FOR_TARGET = $(CROSSCOMPREFIX)cpp
AR_FOR_TARGET = $(CROSSCOMPREFIX)ar
AS_FOR_TARGET = $(CROSSCOMPREFIX)as
LD_FOR_TARGET = $(CROSSCOMPREFIX)ld
NM_FOR_TARGET = $(CROSSCOMPREFIX)nm
OBJDUMP_FOR_TARGET = $(CROSSCOMPREFIX)objdump
OBJCOPY_FOR_TARGET = $(CROSSCOMPREFIX)objcopy
RANLIB_FOR_TARGET = $(CROSSCOMPREFIX)ranlib
STRIP_FOR_TARGET = $(CROSSCOMPREFIX)strip
READELF_FOR_TARGET = $(CROSSCOMPREFIX)readelf

MAKE = make
RM = rm -rf
NASM = nasm
# For 64bit code, you have to use qemu-system-x86_64
QEMU = qemu-system-i386
GDB = gdb

# For 64bit support, you have to define -felf64 instead of -felf32
NASMFLAGS = -felf32 -g -i$(TOPDIR)/include/metalsvm/
INCLUDE = -I$(TOPDIR)/include -I$(TOPDIR)/arch/$(ARCH)/include -I$(TOPDIR)/lwip/src/include -I$(TOPDIR)/lwip/src/include/ipv4 -I$(TOPDIR)/drivers
# For 64bit support, you have to define "-m64 -mno-red-zone" instead of "-m32 -march=i586"
# Compiler options for final code
CFLAGS = -g -m32 -march=i586 -Wall -O2 -fstrength-reduce -fomit-frame-pointer -finline-functions -ffreestanding $(INCLUDE) $(STACKPROT)
# Compiler options for debuging
#CFLAGS = -g -O -m32 -march=i586 -Wall -fomit-frame-pointer -ffreestanding $(INCLUDE) $(STACKPROT)
ARFLAGS = rsv
LDFLAGS = -T link$(BIT).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
OUTPUT_FORMAT = -O elf32-i386
# For 64bit support, you have to define -m64 instead of "-m32 -march=i586"
CFLAGS_FOR_NEWLIB = -m32 -march=i586 -O2 $(STACKPROT)
# For 64bit support, you have to define -m64 instead of "-m32 -march=i586"
LDFLAGS_FOR_NEWLIB = -m32 -march=i586
# For 64bit support, you have to define -m64 instead of "-m32"
CFLAGS_FOR_TOOLS = -m32 -O2 -Wall
LDFLAGS_FOR_TOOLS =
# For 64bit support, you have to define -felf64 instead of -felf32
NASMFLAGS_FOR_NEWLIB = -felf32

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

default: all
	
all: newlib tools $(NAME).elf
	
newlib:
	$(MAKE) ARCH=$(ARCH) BIT=$(BIT) LDFLAGS="$(LDFLAGS_FOR_NEWLIB)" CFLAGS="$(CFLAGS_FOR_NEWLIB)" NASMFLAGS="$(NASMFLAGS_FOR_NEWLIB)" 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:
	$(MAKE) CFLAGS="$(CFLAGS_FOR_TOOLS)" LDFLAGS="$(LDFLAGS_FOR_TOOLS)" -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) $(OUTPUT_FORMAT) $(NAME).elf

qemu: newlib tools $(NAME).elf
	$(QEMU) -monitor stdio -smp 2 -net nic,model=rtl8139 -net user,hostfwd=tcp::12345-:4711 -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-:4711 -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
	$Q$(CPP_FOR_TARGET) -MF $*.dep -MT $*.o -MM -D__KERNEL__ $(CFLAGS) $<

include/metalsvm/config.inc: include/metalsvm/config.h
	@echo "; This file is generated automatically from the config.h file." > include/metalsvm/config.inc
	@echo "; Before editing this, you should consider editing config.h." >> include/metalsvm/config.inc
	@awk '/^#define MAX_CORES/{ print "%define MAX_CORES", $$3 }' include/metalsvm/config.h >> include/metalsvm/config.inc	
	@awk '/^#define KERNEL_STACK_SIZE/{ print "%define KERNEL_STACK_SIZE", $$3 }' include/metalsvm/config.h >> include/metalsvm/config.inc
	@awk '/^#define CONFIG_VGA/{ print "%define CONFIG_VGA", $$3 }' include/metalsvm/config.h >> include/metalsvm/config.inc

%.o : %.asm include/metalsvm/config.inc
	@echo [ASM] $@
	$Q$(NASM) $(NASMFLAGS) -o $@ $<

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