Makefile

# Compiler and flags for Zig (using native build-obj)
ZIG            = zig build-obj
TARGET_FLAGS   = -target x86-freestanding -mcpu=i386
COMMON_FLAGS   = -fPIC
INCLUDE_FLAGS  = -I.
ZIG_EXTRA_FLAGS= -fno-stack-check -Drelease-fast -O ReleaseFast

# waiting on andrew kelly -> https://github.com/ziglang/zig/issues/8755
# Linker and flags
LD       = x86_64-elf-ld
LD_FLAGS = -m elf_i386 -T linker.ld -o kernel.bin

# GRUB rescue tool
GRUB_MKRESCUE = i686-elf-grub-mkrescue

# sources
ZIG_SRCS := $(wildcard *.zig)
ASM_SRCS := $(wildcard *.s)
C_SRCS := gdt.o

clean:
	rm -rf build
	rm -f *.o
	rm -f *.bin
	rm -f *.iso

%.o: %.s
	$(ZIG) $(TARGET_FLAGS) $< $(COMMON_FLAGS)

%.o: %.zig
	$(ZIG) $(TARGET_FLAGS) $(INCLUDE_FLAGS) $< $(ZIG_EXTRA_FLAGS) $(COMMON_FLAGS)

kernel.bin: clean $(ASM_SRCS:.s=.o) $(ZIG_SRCS:.zig=.o)
	$(LD) $(LD_FLAGS) $(ASM_SRCS:.s=.o) $(ZIG_SRCS:.zig=.o) -o kernel.bin

ziggy.iso: kernel.bin
	mkdir -p build/isofiles/boot/grub/
	cp boot/grub.cfg build/isofiles/boot/grub/grub.cfg
	cp kernel.bin build/isofiles/boot/
	$(GRUB_MKRESCUE) -o ziggy.iso build/isofiles


zqemu: ziggy.iso
	qemu-system-i386 -cdrom ziggy.iso -vga std -serial file:serial.log

zqemu-nox: ziggy.iso
	qemu-system-x86_64 -m 128 -cdrom ziggy.iso -vga std -no-reboot -nographic

etch: ziggy.iso
	@if (diskutil info /dev/disk4 | grep -q "Device Location: *External") && (diskutil info /dev/disk4 | grep -q "Protocol: *USB"); then \
		echo "/dev/disk4 is confirmed external."; \
		echo "Unmounting /dev/disk4..."; \
		diskutil unmountDisk /dev/disk4; \
		echo "Etching ziggy.iso to /dev/rdisk4..."; \
		sudo dd if=ziggy.iso of=/dev/rdisk4 bs=4m status=progress && sync; \
		echo "Ejecting /dev/disk4..."; \
		diskutil eject /dev/disk4; \
	else \
		echo "Error: /dev/disk4 is not external. Aborting."; \
		exit 1; \
	fi