dir_sys := $(patsubst %/,%,$(dir $(abspath $(lastword $(MAKEFILE_LIST)))))

c_files += $(dir_sys)/cpu.c \
           $(dir_sys)/multiboot.c \
           $(dir_sys)/serialdbg.c \
           $(dir_sys)/ioport.c \
           $(dir_sys)/isr1.c \
           $(dir_sys)/pic.c \
           $(dir_sys)/mm.c \
           $(dir_sys)/pit.c

S_files += $(dir_sys)/gdt_flush.S \
           $(dir_sys)/tss_flush.S \
           $(dir_sys)/idt_flush.S \
           $(dir_sys)/isr.S \
           $(dir_sys)/halt.S

o_files += $(dir_sys)/cpu.o \
           $(dir_sys)/multiboot.o \
           $(dir_sys)/gdt_flush.o \
           $(dir_sys)/tss_flush.o \
           $(dir_sys)/idt_flush.o \
           $(dir_sys)/isr.o \
           $(dir_sys)/serialdbg.o \
           $(dir_sys)/ioport.o \
           $(dir_sys)/isr1.o \
           $(dir_sys)/halt.o \
           $(dir_sys)/pic.o \
           $(dir_sys)/mm.o \
           $(dir_sys)/pit.o