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


.PHONY: all clean run

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

#font data starts at sector 50
FONT_DATA_START=25600

#data starts at 0x8000
#DATA_START=32768 

CFLAGS=-ffreestanding -std=gnu99 -m32 -fno-asynchronous-unwind-tables -O0

############ 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

#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 0x1000 --oformat binary -melf_i386 $^ -O0


############ 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: Fool.img FoolData.img $(FILLUP)
	cat $^ | head -c $(IMAGE_SIZE) > $@

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

FoolData.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


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

clean:
	-rm *.bin *.img bochs.log $(KERNEL_ENTRY) $(ASMOBJECTS) $(OBJECTS) $(FILLUP) $(MBR)