KERNEL := hhhos.elf
ISO := hhhos.iso

CC = x86_64-elf-gcc
NASM = nasm

# User controllable CFLAGS.
CFLAGS = -Wall -Wextra -O2 -pipe
NASMFLAGS = -felf64
 
# Internal link flags that should not be changed by the user.
INTERNALLDFLAGS :=     \
	-fno-pic -fpie \
	-Wl,-static,-pie,--no-dynamic-linker,-ztext \
	-static-pie    \
	-nostdlib      \
	-Tlinker.ld    \
	-z max-page-size=0x1000
 
# Internal C flags that should not be changed by the user.
INTERNALCFLAGS  :=           \
	-Iinclude            \
	-std=gnu17           \
	-ffreestanding       \
	-fno-stack-protector \
	-fno-pic -fpie       \
	-mno-80387           \
	-mno-mmx             \
	-mno-3dnow           \
	-mno-sse             \
	-mno-sse2            \
	-mno-red-zone
 
# Use find to glob all *.c files in the directory and extract the object names.
CFILES := $(shell find ./arch -type f -name '*.c')
OBJ := $(CFILES:.c=.o)
OBJ += font.o

# Targets that do not actually build a file of the same name.
.PHONY: all clean run

run: $(ISO)
	qemu-system-x86_64 -cdrom $(ISO) -m 128M -serial file:serial.log \
		-drive id=disk,file=disk.img,if=none,format=raw \
		-device ide-hd,drive=disk,bus=ide.0

$(ISO): $(KERNEL)
	mkdir -p sysroot
	cp -v $(KERNEL) limine.cfg limine/limine.sys limine/limine-cd.bin limine/limine-eltorito-efi.bin sysroot/
	xorriso -as mkisofs -b limine-cd.bin -no-emul-boot -boot-load-size 4 -boot-info-table \
        --efi-boot limine-eltorito-efi.bin -efi-boot-part --efi-boot-image --protective-msdos-label \
        sysroot -o $(ISO)

# Default target.
all: $(KERNEL)

# Link rules for the final kernel executable.
$(KERNEL): $(OBJ)
	$(CC) $(OBJ) -o $@ $(INTERNALLDFLAGS)

# Compilation rules for *.c files.
%.o: %.c
	$(CC) $(CFLAGS) $(INTERNALCFLAGS) -c $< -o $@

font.o:
	objcopy -O elf64-x86-64 -B i386 -I binary font.psfu font.o

# Remove object files and the final executable.
clean:
	rm -rf $(KERNEL) $(OBJ) $(ISO)