# Compiler/assembler settings

# C
CC			= gcc
CFLAGS 		= -fno-pie -m32 -Os -ffreestanding

# Rust
RC			= rustc
# WARN: target might not exist on your machine. Just swap it out to whatever 32bit target that you have.
RTARGET		= i686-unknown-linux-gnu
RFLAGS		= --emit=obj --target $(RTARGET)

# Assembly
AA			= nasm
AFLAGS		= 

# Linking
LD			= gcc
LDFLAGS		= -Wl,--oformat=binary -ffreestanding -nostdlib -shared -Ttext 0x1000 -m32

# VM/Debug settings
VM			= qemu-system-x86_64
VMFLAGS		= 

# Do not touch these.
C_SOURCES 	= $(wildcard kernel/*.c drivers/*.c lib/*.c)
HEADERS 	= $(wildcard kernel/*.h drivers/*.h lib/*.h)
R_SOURCES	= $(wildcard kernel/*.rs drivers/*.rs lib/*.rs)

OBJ 		= $(C_SOURCES:.c=.o)
ROBJ		= $(R_SOURCES:.rs=.o)

all: eos.iso

run: all
	$(VM) $(VMFLAGS) eos.iso

drun: clean run

grub: eos_grub.iso
	$(VM) $(VMFLAGS) eos_grub.iso

eos_grub.iso : kernel.bin grub/grub.cfg
	mkdir -p boot/grub
	cp $< boot/eOS.bin
	cp grub/grub.cfg boot/grub/grub.cfg
	grub-mkrescue -o eos_grub.iso ./

eos.iso: bootloader/bootloader.bin kernel.bin
	cat $^ > eos.iso

kernel.bin: kernel/kernel_entry.o kernel/enable_paging.o $(OBJ) $(ROBJ)
	$(LD) -o $@ $^ $(LDFLAGS) 

%.o : %.c ${HEADERS}
	$(CC) $(CFLAGS) -c $< -o $@

%.o : %.rs
	$(RC) $< -o $@ $(RFLAGS)

%.o : %.asm
	$(AA) $< -f elf -o $@ $(AFLAGS)

%.bin : %.asm
	$(AA) $< -f bin -o $@ $(AFLAGS)

clean:
	rm -rf *.bin *.dis *.o eos.iso *.map boot/ *.iso
	rm -rf kernel/*.o bootloader/*.bin drivers/*.o