#####################
    #			#
    # FoolOS Build Sys.	#
    #			#
    #####################


############ phony targets ############

.PHONY: all clean run stick new newrun


############ some constants ############

USB_STICK=/dev/sdf	#take care!

#here our kernel will be loaded by the bootloader.
KERNEL_START=0x100000

#use our cross compiler
CC=i686-elf-gcc

############ flags ############

CFLAGS=-ffreestanding -nostdlib -lgcc -std=gnu11
CFLAGS+= -I.
CFLAGS+= -Wno-implicit-function-declaration
#CFLAGS+= -O0
#CFLAGS+=-fdata-sections -ffunction-sections
#CFLAGS+= -Werror

############ source and object files ############

#kernel sources (asm and c)

SOURCES=$(wildcard ./kernel/*.c)
SOURCES+=$(wildcard ./lib/*/*.c)
SOURCES+=$(wildcard ./fs/*.c)

ASMSOURCES=$(wildcard ./asm/*.asm)

#kernel object files

OBJECTS=$(patsubst %.c, %.o, $(SOURCES))
ASMOBJECTS=$(patsubst %.asm, %.o, $(ASMSOURCES))
KERNEL_ENTRY=./boot/kernel_entry.o

#master boot record asm

MBR=./boot0/mbr.bin

#stage 2 bootloader
STAGE2=./boot/stage2.bin

#multiprocessor binary entry

MP_BIN=./boot/mp.bin


#some fillup data (zeros)

FILLUP=./data/fill.bin


############ final image (default target) ############

all: FoolOS.vdi

new: clean all
	
newrun: clean run

############ nasm assembling rules ############

%.o: %.asm
	nasm -f elf $^ -o $@

%.bin: %.asm
	nasm -f bin $^ -o $@


############ linking kernel binary ############

# the kernel_entry.o needs to be FIRST!!
kernel.bin: $(KERNEL_ENTRY) $(ASMOBJECTS) $(OBJECTS) 
	$(CC) $(CFLAGS) -o $@ -Wl,-Ttext,$(KERNEL_START),--oformat,binary $^ 
	#ld -o $@ -Ttext $(KERNEL_START) --oformat binary -melf_i386 $^ -O0 # --gc-sections --entry=kernel_main -v


############ fool-font ############

binfont.bin: data/binfont.src
	python tools/binarize.py $< $@


############ assembling of final image ############

# master boot record, kernel binary and fool-font 

FoolOS.img: $(MBR) $(STAGE2) kernel.bin $(FILLUP) FoolData.img
	cp $(FILLUP) $@
	dd if=$(MBR) of=$@ bs=512 seek=0 conv=notrunc
	dd if=$(STAGE2) of=$@ bs=512 seek=1 conv=notrunc
	dd if=kernel.bin of=$@ bs=512 seek=10 conv=notrunc #will end up at 0x100000 in ram (this is what the booloader starts loading secotr: 10)
	dd if=FoolData.img of=$@ bs=512 seek=842 conv=notrunc	#data starts at 0x168000

binfont.img:  binfont.bin
	cat $^ > $@

FoolData.img: binfont.bin $(MP_BIN) userspace/ext2.img
	dd if=$(MP_BIN) of=$@ bs=512 seek=0 conv=notrunc
	dd if=binfont.bin of=$@ bs=512 seek=1 conv=notrunc
	dd if=userspace/ext2.img of=$@ bs=512 seek=4 conv=notrunc #will end up at 0x80800 in ram

FoolOS.vdi: FoolOS.img
	VBoxManage convertfromraw FoolOS.img FoolOS.vdi  --uuid 2f11ca11-c35d-4240-b77e-79e37d32616c 

############ vm stuff ############

# run in our local bochs (we need cirrus support for our vesa mode)

run: all
	~/opt/bochs-2.6.6/bochs -q -f bochs/bochsrc -rc bochs/bochsdebug 


############ cleanup ############

clean_release:
	-rm *.bin FoolData.img binfont.img bochs.log $(KERNEL_ENTRY) $(ASMOBJECTS) $(OBJECTS) $(FILLUP) $(MBR) $(MP_BIN) bochs.out ne2k-tx.log ne2k-txdump.txt $(STAGE2)
	make -C userspace clean

clean: clean_release
	-rm FoolOS.img FoolOS.vdi

release: new
	-mv FoolOS.img release/
	make clean_release

userspace/ext2.img:
	make -C userspace

############ test stuff ############
stick:  FoolOS.img
	cat FoolOS.img > $(USB_STICK) && sync
	xxd $(USB_STICK)  | head -n 50