CC_EXTRA_FLAGS = -O3 -Wall -Wextra
CC_FLAGS = -std=c23 -mno-sse -ffreestanding ${CC_EXTRA_FLAGS}

.PHONY: default
default: build/disk.iso

.PHONY: debug
debug: build/disk.iso
	gdb -x qemu.gdb

.PHONY: clean
clean:
	rm -rf build

# kernel

KERNEL_SOURCES = entry.c paging.asm paging.c

build/kernel/%.asm.o: kernel/src/%.asm
	@mkdir -p ${@D}
	nasm -f elf64 $^ -o $@

build/kernel/%.c.o: kernel/src/%.c
	@mkdir -p ${@D}
	cc -c ${CC_FLAGS} -I dependencies/limine -I kernel/include $^ -o $@

build/kernel/kernel.elf: ${KERNEL_SOURCES:%=build/kernel/%.o}
	ld -T kernel/link.ld $^ -o $@

# disk

build/disk.iso: build/kernel/kernel.elf
	rm -rf build/disk
	cp -r disk build/disk
	cp dependencies/limine/limine-uefi-cd.bin build/disk/limine/
	cp dependencies/limine/limine-bios-cd.bin build/disk/limine/
	cp dependencies/limine/limine-bios.sys build/disk/limine/
	mkdir -p build/disk/EFI/BOOT
	cp dependencies/limine/BOOTX64.EFI build/disk/EFI/BOOT/
	mkdir build/disk/calcite
	cp build/kernel/kernel.elf build/disk/calcite/
	xorriso \
	  -as mkisofs -R -r -J -b limine/limine-bios-cd.bin -no-emul-boot \
	  -boot-load-size 4 -boot-info-table -hfsplus -apm-block-size 2048 \
	  --efi-boot limine/limine-uefi-cd.bin -efi-boot-part --efi-boot-image \
	  --protective-msdos-label build/disk -o build/disk.iso
	dependencies/limine/limine bios-install build/disk.iso