#####################
    #			#
    # FoolOS Makefile	#
    #			#
    #####################

#TODO: use implicit rules !!

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

#final image
all: FoolOS.img

#assembling of final image
FoolOS.img: mbr.bin kernel.bin fill.bin
	cat $^ | head -c $(IMAGE_SIZE) > $@

#some data just to fill up to the target image_size
fill.bin: boot/fill.asm
	nasm -f bin $^ -o $@

#this is the MASTER BOOT RECORD, where our bootloader lives
mbr.bin: boot/mbr.asm
	nasm -f bin $^ -o $@

kernel_entry.o: boot/kernel_entry.asm
	nasm -f elf $^ -o $@


kernel.o: kernel/kernel.c kernel/console.h
	gcc -ffreestanding -m32 -o $@ -c $< -fno-asynchronous-unwind-tables -O0

x86.o: kernel/x86.c 
	gcc -ffreestanding -m32 -o $@ -c $< -fno-asynchronous-unwind-tables -O0

floppy.o: kernel/floppy.c 
	gcc -ffreestanding -m32 -o $@ -c $< -fno-asynchronous-unwind-tables -O0

vmem.o: kernel/vmem.c 
	gcc -ffreestanding -m32 -o $@ -c $< -fno-asynchronous-unwind-tables -O0

mem.o: kernel/mem.c 
	gcc -ffreestanding -m32 -o $@ -c $< -fno-asynchronous-unwind-tables -O0

e1000.o: kernel/e1000.c
	gcc -ffreestanding -m32 -o $@ -c $< -fno-asynchronous-unwind-tables -O0
	
pci.o: kernel/pci.c
	gcc -ffreestanding -m32 -o $@ -c $< -fno-asynchronous-unwind-tables -O0

console.o: kernel/console.c kernel/console.h
	gcc -ffreestanding -m32 -o $@ -c $< -fno-asynchronous-unwind-tables -O0

interrupts.o: kernel/interrupts.c kernel/interrupts.h
	gcc -ffreestanding -m32 -o $@ -c $< -fno-asynchronous-unwind-tables -O0

keyboard.o: kernel/keyboard.c 
	gcc -ffreestanding -m32 -o $@ -c $< -fno-asynchronous-unwind-tables -O0

timer.o: kernel/timer.c
	gcc -ffreestanding -m32 -o $@ -c $< -fno-asynchronous-unwind-tables -O0
	
shell.o: kernel/shell.c
	gcc -ffreestanding -m32 -o $@ -c $< -fno-asynchronous-unwind-tables -O0

kernel.bin: kernel_entry.o kernel.o console.o interrupts.o keyboard.o timer.o floppy.o x86.o shell.o mem.o vmem.o pci.o e1000.o 
	ld -o $@ -Ttext 0x1000 --oformat binary -melf_i386 $^ -O0


# dump from vbox
dump: FoolOS.img
	vboxmanage debugvm FoolOs dumpguestcore --filename dump.elf
	xxd dump.elf > dump.xxd

run: FoolOS.img
	bochs

clean:
	-rm *.bin *.o *.img dump.elf dump.xxd bochs.log

.PHONY: all clean