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



# main phony targets

.PHONY: all new run newrun stick clean

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

#submodules
SUBDIRS=boot1 boot2 font userspace

FOOLOS=FoolOS.img
FOOLOS_VDI=FoolOS.vdi

#take care to set this properly!
USB_STICK=/dev/sdf	

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

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

############ compiler flags ############
CFLAGS=
CFLAGS+=-ffreestanding 
CFLAGS+=-nostdlib 
CFLAGS+=-std=gnu11
CFLAGS+= -I.
#CFLAGS+=-lgcc 
CFLAGS+=-Werror-implicit-function-declaration
#CFLAGS+= -O4
#CFLAGS+=-fdata-sections -ffunction-sections
#CFLAGS+= -Werror



############ source and object files and their deps ############

#kernel sources (asm and c)
SOURCES=
SOURCES+=$(wildcard ./kernel/*.c)
SOURCES+=$(wildcard ./video/*.c)
SOURCES+=$(wildcard ./lib/*/*.c)
SOURCES+=$(wildcard ./fs/*.c)

#derive kernel object files
OBJECTS=$(patsubst %.c, %.o, $(SOURCES))

#derive deps
DEPS=$(patsubst %.c, %.d, $(SOURCES))



####### ASM STUFF #####

ASM_SOURCES=$(wildcard ./asm/*.asm)
ASM_OBJECTS=$(patsubst %.asm, %.o, $(ASM_SOURCES))
KERNEL_ENTRY=./asm/kernel_entry.o



############ Final Targets ############

all: FoolOS.vdi FoolOS.img
new: clean all



########### INCLUDES ###################3

include Makefile.common
-include $(DEPS)


#### BINARIES AND SUBMODULES ########

BIN_KERNEL=kernel.bin
BIN_MBR=./boot1/mbr.bin
BIN_STAGE2=./boot2/stage2.bin
BIN_MP=./boot2/mp.bin
BIN_FOOLFONT=./font/binfont.bin

IMG_FILLUP=fill.img
IMG_USERSPACE=./userspace/ext2.img


######### RECURSIVE MAKES ########################


CLEANDIRS=$(SUBDIRS:%=clean-%)

.PHONY: $(SUBDIRS) $(CLEANDIRS)

$(SUBDIRS):
	$(MAKE) -C $@

$(CLEANDIRS):
	$(MAKE) -C $(@:clean-%=%) clean



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

# the kernel_entry.o needs to be FIRST!!
$(BIN_KERNEL): $(KERNEL_ENTRY) $(ASM_OBJECTS) $(OBJECTS) 
	$(CC) $(CFLAGS) -o $@ -Wl,-Ttext,$(KERNEL_START),--oformat,binary $^ 



######## generate empty image ~25MB ###############

$(IMG_FILLUP):
	dd if=/dev/zero of=$(IMG_FILLUP) bs=512 count=50000



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

# master boot record, kernel binary and fool-font 
$(FOOLOS): $(IMG_FILLUP)  $(BIN_KERNEL) $(SUBDIRS)
	cp $(IMG_FILLUP) $@
	dd if=$(BIN_MBR) of=$@ bs=512 seek=0 conv=notrunc
	dd if=$(BIN_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)
	#data starts at 0x168000
	dd if=$(BIN_MP) of=$@ bs=512 seek=842 conv=notrunc
	dd if=$(BIN_FOOLFONT) of=$@ bs=512 seek=843 conv=notrunc
	dd if=$(IMG_USERSPACE) of=$@ bs=512 seek=846 conv=notrunc 	#will end up at 0x80800 in ram


############ virtual machines stuff ############

# vdi image for VirtualBox
$(FOOLOS_VDI): $(FOOLOS)
	-rm FoolOS.vdi
	VBoxManage convertfromraw $< $@  --uuid 2f11ca11-c35d-4240-b77e-79e37d32616c 

# 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 

newrun: clean run



############ create bootable usb image ############

stick:  $(FOOLOS)
	cat $< > $(USB_STICK) && sync
	xxd $(USB_STICK)  | head -n 50



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

clean: $(CLEANDIRS)
	-rm *.bin $(FOOLOS) $(FOOLOS_VDI) $(KERNEL_ENTRY) $(ASM_OBJECTS) $(OBJECTS) $(IMG_FILLUP) $(BIN_MBR) $(BIN_MP) $(BIN_STAGE2) $(DEPS) bochs.out bochs.log ne2k-tx.log ne2k-txdump.txt