Makefile

# =========================================================
#               Libra Kernel Build System
# =========================================================

# -------------------------
# Toolchain (CI + Local)
# -------------------------

ACTIONS ?= 0
DETECTED_OS := $(shell uname -s)
ifeq ($(ACTIONS),1)
    TOOLCHAIN_DIR := $(shell pwd)/toolchain
    CROSS_COMPILE := $(TOOLCHAIN_DIR)/
else
    CROSS_COMPILE ?= toolchain/
endif

CC := x86_64-elf-gcc
LD := x86_64-elf-ld
AR := x86_64-elf-ar
HCC = gcc
HCFLAGS      := -Wall -Wextra -O2
NCURSES_LIBS:= -lncursesw   # Required to link the terminal interface

AS := nasm
QEMU := qemu-system-x86_64
XORRISO := xorriso
export srctree := .
export SRCARCH := x86

# Directory references
SRC_DIR     := scripts/kbuild-standalone
BIN_DIR     := tools/bin

# Build targets for compiled configuration utilities
CONF_BIN    := $(BIN_DIR)/conf
MCONF_BIN   := $(BIN_DIR)/mconf

# -------------------------
# Flags
# -------------------------

CFLAGS := \
	-ffreestanding \
	-fno-stack-protector \
	-fno-pic \
	-mno-red-zone \
	-m64 \
	-march=x86-64 \
	-mcmodel=kernel \
	-O0 \
	-Wall -Wextra \
	-g \
	-I./inc -I. \
	-mno-sse -mno-mmx -mno-3dnow -fpermissive -Wno-error=int-conversion -Wno-error=incompatible-pointer-types -Wno-error=implicit-function-declaration

LDFLAGS := \
	-T linker.ld \
	-nostdlib \
	-z max-page-size=0x1000

ASFLAGS := -f elf64

# -------------------------
# Directories
# -------------------------

SRC_DIR := src
OBJ_DIR := objects
DEP_DIR := dependencies
ISO_DIR := iso

# -------------------------
# Sources
# -------------------------

SRCS_C   := $(shell find $(SRC_DIR) -type f -name '*.c')
SRCS_S   := $(shell find $(SRC_DIR) -type f -name '*.s')
SRCS_ASM := $(shell find $(SRC_DIR) -type f -name '*.asm')

OBJS_C   := $(patsubst $(SRC_DIR)/%.c, $(OBJ_DIR)/%.o, $(SRCS_C))
OBJS_S   := $(patsubst $(SRC_DIR)/%.s, $(OBJ_DIR)/%_s.o, $(SRCS_S))
OBJS_ASM := $(patsubst $(SRC_DIR)/%.asm, $(OBJ_DIR)/%_asm.o, $(SRCS_ASM))

OBJS := $(OBJS_C) $(OBJS_S) $(OBJS_ASM)

DEPS := $(patsubst $(SRC_DIR)/%.c, $(DEP_DIR)/%.d, $(SRCS_C))

# -------------------------
# Output
# -------------------------

KERNEL := $(ISO_DIR)/kernel.elf
ISO    := custom_os.iso
INITRAMFS := $(ISO_DIR)/initramfs.cpio

# -------------------------
# Targets
# -------------------------

.PHONY: all clean iso run dirs initramfs

all: $(KERNEL)

# -------------------------
# Link Kernel
# -------------------------

$(KERNEL): genconfig $(OBJS) linker.ld | dirs
	@echo "[LD] Linking kernel"
	@mkdir -p $(dir $@)
	@$(LD) $(LDFLAGS) $(OBJS) -o $@

# -------------------------
# Compile C
# -------------------------

$(OBJ_DIR)/%.o: $(SRC_DIR)/%.c | dirs
	@echo "[CC] $<"
	@mkdir -p $(dir $@)
	@$(CC) $(CFLAGS) -c $< -o $@

# -------------------------
# Assemble .s
# -------------------------

$(OBJ_DIR)/%_s.o: $(SRC_DIR)/%.s | dirs
	@echo "[AS] $<"
	@mkdir -p $(dir $@)
	@$(AS) $(ASFLAGS) $< -o $@

# -------------------------
# Assemble .asm
# -------------------------

$(OBJ_DIR)/%_asm.o: $(SRC_DIR)/%.asm | dirs
	@echo "[AS] $<"
	@mkdir -p $(dir $@)
	@$(AS) $(ASFLAGS) $< -o $@

# -------------------------
# Directories
# -------------------------

dirs:
	@mkdir -p $(OBJ_DIR) $(DEP_DIR) $(ISO_DIR)

# -------------------------
# ISO Build (UEFI)
# -------------------------

initramfs: | dirs
	@echo "[CPIO] Packing initramfs"
	@cd rootfs && find . -type f | cpio -o -H newc --quiet > ../$(INITRAMFS)

iso: $(KERNEL) initramfs
	@echo "[ISO] building..."

	@if [ ! -f $(ISO_DIR)/limine.conf ]; then \
		echo "ERROR: missing limine.conf"; exit 1; \
	fi

	@cp limine/limine-uefi-cd.bin $(ISO_DIR)/
	@mkdir -p $(ISO_DIR)/EFI/BOOT
	@cp limine/BOOTX64.EFI $(ISO_DIR)/EFI/BOOT/

	@$(XORRISO) -as mkisofs \
		-e limine-uefi-cd.bin \
		-no-emul-boot \
		-efi-boot-part \
		--efi-boot-image \
		--protective-msdos-label \
		$(ISO_DIR) -o $(ISO)

# -------------------------
# Run in QEMU
# -------------------------

run: iso
	@echo "[QEMU] booting..."
	@$(QEMU) \
		-bios ./prebuilt/OVMF.fd \
		-m 4G \
		-M q35 \
		-serial stdio \
		-D qemu.log \
		-d int \
		-drive id=disk0,file=my_disk.qcow2,if=none,format=qcow2 \
		-device ide-hd,drive=disk0,bus=ide.0 \
		-cdrom $(ISO) \
		-netdev user,id=net0 \
		-device rtl8139,netdev=net0 \
		-object filter-dump,id=f1,netdev=net0,file=packets.pcap \
		-audiodev alsa,id=snd0 -device AC97,audiodev=snd0 \
		-drive file=nvme.img,if=none,id=nvme0,format=raw \
		-device nvme,drive=nvme0,serial=deadbeef \
		-device qemu-xhci,id=xhci \
		-smp 4 -device virtio-gpu-pci,xres=1280,yres=720 \
		-trace "virtio_*" \
	    -trace "virtio_gpu_*" \
	    -trace "pci_*"
# -------------------------
# Python-based Kconfiglib Environment (PEP 668 Compliant)
# -------------------------
VENV_DIR      := .venv
VENV_ACTIVATE := $(VENV_DIR)/bin/activate
VENV_PIP      := $(VENV_DIR)/bin/pip
MENUCONFIG_PY := $(VENV_DIR)/bin/menuconfig
OLDCONFIG_PY  := $(VENV_DIR)/bin/oldconfig

# Virtual environment prerequisite target
$(VENV_ACTIVATE):
	@echo "[VENV] Creating localized Python environment..."
	@python3 -m venv $(VENV_DIR)
	@echo "[VENV] Installing kconfiglib package..."
	@$(VENV_PIP) install --upgrade pip > /dev/null
	@$(VENV_PIP) install kconfiglib > /dev/null

# Replaces compile_tools entirely
compile_tools: $(VENV_ACTIVATE)
	@mkdir -p $(BIN_DIR)
	@echo "[VENV] Python engine ready."

# Interactive visual configuration shell menu
# Interactive visual configuration shell menu (Dark Aqua Theme)
menuconfig: compile_tools
	@echo "[KCONFIG] Launching Python menuconfig with Dark Aqua Theme..."
	@export MENUCONFIG_STYLE="\
		body=fg:darkcyan bg:default;\
		main_frame=fg:cyan bg:default;\
		frame_title=fg:brightcyan bg:default bold;\
		cursor=fg:black bg:cyan bold;\
		selected_item=fg:brightcyan bg:default bold;\
		unselected_item=fg:white bg:default;\
		help=fg:darkcyan bg:default;\
		separator=fg:cyan bg:default;\
		shadow=fg:black bg:default;\
		menu=fg:white bg:default;\
		text=fg:white bg:default;\
		jumps=fg:brightcyan bg:default bold;\
		inputs=fg:white bg:darkcyan;\
		buttons=fg:black bg:cyan;\
		selected_button=fg:black bg:brightcyan bold;\
		unselected_button=fg:white bg:darkcyan"; \
	. $(VENV_ACTIVATE) && $(MENUCONFIG_PY) Kconfig

# Automatic header compiler generator 
genconfig: compile_tools
	@echo "[KCONFIG] Generating configuration header..."
	@mkdir -p inc
	@export srctree=.; \
	export SRCARCH=x86; \
	export KCONFIG_AUTOHEADER=inc/config.h; \
	. $(VENV_ACTIVATE) && python3 $(VENV_DIR)/bin/genconfig Kconfig

clean:
	@echo "[CLEAN]"
	@rm -rf $(OBJ_DIR) $(DEP_DIR) $(ISO) $(ISO_DIR)/kernel.elf
	@rm -rf inc/config.h
	@rm -rf $(BIN_DIR)/*
	@rm -rf qemu.log .config .config.old

-include $(DEPS)