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



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

#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)



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

# master boot record
MBR=./boot1/mbr.bin
$(MBR):
	make -C boot1 mbr.bin

# stage 2 bootloader
STAGE2=./boot2/stage2.bin
$(STAGE2):
	make -C boot2 stage2.bin

# multiprocessor binary entry
MP_BIN=./boot2/mp.bin
$(MP_BIN):
	make -C boot2 mp.bin

# fonts
FOOLFONT=./font/binfont.bin
$(FOOLFONT):
	make -C font binfont.bin

# userspace
USERSPACE=./userspace/ext2.img
$(USERSPACE):
	make -C userspace ext2.img
	


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

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



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

FILLUP=fill.img
$(FILLUP):
	dd if=/dev/zero of=$(FILLUP) bs=512 count=50000



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

# master boot record, kernel binary and fool-font 
FoolOS.img: $(MBR) $(STAGE2) kernel.bin $(FILLUP) $(FOOLFONT) $(MP_BIN) $(USERSPACE)
	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)
	#data starts at 0x168000
	dd if=$(MP_BIN) of=$@ bs=512 seek=842 conv=notrunc
	dd if=$(FOOLFONT) of=$@ bs=512 seek=843 conv=notrunc
	dd if=$(USERSPACE) of=$@ bs=512 seek=846 conv=notrunc 	#will end up at 0x80800 in ram



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

# vdi image for VirtualBox
FoolOS.vdi: FoolOS.img
	-rm FoolOS.vdi
	VBoxManage convertfromraw FoolOS.img FoolOS.vdi  --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.img
	cat FoolOS.img > $(USB_STICK) && sync
	xxd $(USB_STICK)  | head -n 50



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

clean:
	-rm *.bin FoolData.img bochs.log $(KERNEL_ENTRY) $(ASMOBJECTS) $(OBJECTS) $(FILLUP) $(MBR) $(MP_BIN) bochs.out ne2k-tx.log ne2k-txdump.txt $(STAGE2) $(DEPS) $(ASM_OBJECTS)
	-rm FoolOS.img FoolOS.vdi
	make -C boot1 clean
	make -C boot2 clean
	make -C userspace clean
	make -C font clean