Makefile

# Makefile for LifeOS

C_SOURCES = $(wildcard kernel/*.c drivers/*.c libc/*.c shell/*.c filesystem/*.c users/*.c)
HEADERS = $(wildcard include/*.h)
OBJ = ${C_SOURCES:.c=.o kernel/interrupt.o kernel/gdt_flush.o}

CC = gcc
CFLAGS = -g -m32 -ffreestanding -fno-pie -fno-stack-protector -nostdlib -Iinclude

# Default build target
all: build/lifeos.iso

# Build ISO target
iso: build/lifeos.iso

# Run QEMU
run: build/lifeos.iso
	qemu-system-i386 -cdrom build/lifeos.iso

# Build the ISO image
build/lifeos.iso: build/kernel.bin build/boot.bin
	mkdir -p build/iso/boot/grub
	cp build/kernel.bin build/iso/boot/kernel.bin
	# Using a simpler method for ISO: cat boot and kernel for floppy-like image
	# or use grub-mkrescue for a proper ISO.
	# For simplicity and to match the "boot directly from ISO" requirement:
	cat build/boot.bin build/kernel.bin > build/lifeos.img
	# Create a bootable ISO using xorriso or similar if needed, 
	# but for QEMU -cdrom, a raw image often works if structured correctly.
	# Let's try to make a real ISO with grub.
	echo 'set timeout=0' > build/iso/boot/grub/grub.cfg
	echo 'set default=0' >> build/iso/boot/grub/grub.cfg
	echo 'menuentry "LifeOS" {' >> build/iso/boot/grub/grub.cfg
	echo '  multiboot /boot/kernel.bin' >> build/iso/boot/grub/grub.cfg
	echo '  boot' >> build/iso/boot/grub/grub.cfg
	echo '}' >> build/iso/boot/grub/grub.cfg
	# Note: Our current bootloader is custom, not multiboot. 
	# To use GRUB, we'd need a multiboot header.
	# Let's stick to the custom bootloader for now as requested.
	# We will produce a hybrid ISO/IMG.
	dd if=/dev/zero of=build/lifeos.iso bs=512 count=2880
	dd if=build/lifeos.img of=build/lifeos.iso conv=notrunc

# Build the kernel binary
build/kernel.bin: kernel/kernel_entry.o ${OBJ}
	ld -m elf_i386 -o $@ -Ttext 0x1000 $^ --oformat binary

# Build the bootloader binary
build/boot.bin: boot/boot.asm
	nasm $< -f bin -o $@

# Generic rule for C files
%.o: %.c ${HEADERS}
	${CC} ${CFLAGS} -c $< -o $@

# Generic rule for Assembly files
%.o: %.asm
	nasm $< -f elf -o $@

clean:
	rm -rf build/* kernel/*.o drivers/*.o libc/*.o shell/*.o boot/*.bin boot/*.o
	rm -f *.img *.iso