MAKEFILE_DIR := $(dir $(abspath $(lastword $(MAKEFILE_LIST))))

BUILD_DIR ?= $(MAKEFILE_DIR)build
ARCH ?= x86_64
KERNEL_FILE_NAME ?= bzImage
INITRAMFS_FILE = $(BUILD_DIR)/linux/initramfs.cpio
KERNEL_FILE = $(BUILD_DIR)/linux/kernel/arch/$(ARCH)/boot/$(KERNEL_FILE_NAME)

export BUILD_DIR
export ARCH
export KERNEL_FILE_NAME

kernel: 
	$(MAKE) -C $(MAKEFILE_DIR)/linux kernel

initramfs:
	$(MAKE) -C $(MAKEFILE_DIR)/linux initramfs -B


kernel-config:
	$(MAKE) -C $(MAKEFILE_DIR)/linux kernel-config

qemu:
	qemu-system-x86_64 -kernel $(KERNEL_FILE) -initrd $(INITRAMFS_FILE) -append "rdinit=/usr/sbin/init console=ttyS0" -serial mon:stdio


clean:
	rm -rf $(BUILD_DIR)