TOPDIR = $(shell pwd)
ARCH = x86
NAME = eduos
KERNDIRS = libkern kernel mm arch/$(ARCH)/kernel arch/$(ARCH)/mm
SUBDIRS = $(KERNDIRS)

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

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

NASM = nasm
GDB = gdb
QEMU = qemu-system-i386

NASMFLAGS = -felf32 -g -i$(TOPDIR)/include/eduos/
GDBFLAGS = -x debug.gdb
QEMUFLAGS = -smp 2 -monitor stdio \
	    -net nic,model=rtl8139 \
	    -net user,hostfwd=tcp::12345-:7 \
	    -serial tcp::12346,server,nowait

INCLUDE = -I$(TOPDIR)/include -I$(TOPDIR)/arch/$(ARCH)/include
# Compiler options for final code
CFLAGS = -g -m32 -march=i586 -Wall -O2 -fno-builtin -fstrength-reduce -fomit-frame-pointer -finline-functions -nostdinc $(INCLUDE) -fno-stack-protector
# Compiler options for debugging
#CFLAGS = -g -O -m32 -march=i586 -Wall -fno-builtin -DWITH_FRAME_POINTER -nostdinc $(INCLUDE) -fno-stack-protector
AR = ar
ARFLAGS = rsv
RM = rm -rf
LDFLAGS = -T link.ld -z max-page-size=4096 --defsym __BUILD_DATE=$(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: $(NAME).elf

$(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

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

veryclean: clean
	$Q$(RM) qemu-vlan0.pcap
	@echo Very cleaned

qemu: $(NAME).elf
	$(QEMU) $(QEMUFLAGS) -kernel $(NAME).elf

debug: $(NAME).elf
	$(TERM) -e $(GDB) $(GDBFLAGS) &
	$(QEMU) $(QEMUFLAGS) -s -S -kernel $(NAME).elf

doc:
	@echo Create documentation...
	@doxygen

%.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) $<

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

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

%.o : %.S
	@echo [GCC-ASM] $@
	$Q$(CC_FOR_TARGET) $(CFLAGS) -c -o $@ $<

.PHONY: default all clean emu gdb newlib tools

include $(addsuffix /Makefile,$(SUBDIRS))