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


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

.PHONY: all clean run


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

#lets use the size of a 1.44 floppy for a start for our boot img
IMAGE_SIZE=1474560	#floppy

#ap bin :
MP_IMG_START=26112	#multiboot is initially at 0x6600

#font data starts here:
FONT_DATA_START=26624	#fool font initially at 0x6800


USB_STICK=/dev/sdd

KERNEL_START=0x10000


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

CFLAGS=-ffreestanding -std=gnu99 -m32 -fno-asynchronous-unwind-tables -O0 
CFLAGS+= -I.
#CFLAGS+=-fdata-sections -ffunction-sections
#CFLAGS+= -Werror


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

#kernel sources (asm and c)

SOURCES=$(wildcard ./kernel/*.c)
SOURCES+=$(wildcard ./lib/*/*.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=./boot/mbr.bin


#multiprocessor binary entry

MP_BIN=./boot/mp.bin


#some fillup data (zeros)

FILLUP=./data/fill.bin


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

all: FoolOS.img 


############ 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) 
	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_kernel_mp.img binfont.img $(FILLUP)
	cat $^ | head -c $(IMAGE_SIZE) > $@

mbr_kernel_mp.img: mbr_kernel.img $(MP_BIN) $(FILLUP)
	cat $^ | head -c $(FONT_DATA_START) > $@

mbr_kernel.img: $(MBR) kernel.bin $(FILLUP)
	cat $^ | head -c $(MP_IMG_START) > $@

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


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

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

run: FoolOS.img
	~/opt/bochs-2.6.6/bochs -q -rc bochsdebug


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

clean:
	-rm *.bin *.img bochs.log $(KERNEL_ENTRY) $(ASMOBJECTS) $(OBJECTS) $(FILLUP) $(MBR) $(MP_BIN) bochs.out ne2k-tx.log ne2k-txdump.txt

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



##### floppy operations #######
floppy_losetup_on:
	sudo losetup /dev/loop0 data/floppy.img
floppy_losetup_off:
	sudo losetup -d /dev/loop0 
floppy_init:
	sudo dd if=/dev/zero of=data/floppy.img count=2880 bs=512