interrupt descriptor table setup, but has no handlers yet

makefile

@@ -3,7 +3,8 @@ ASM=nasm
 LINK=ld
 ISO=genisoimage
 
-OBJECTS=kernel.o gdt_seg.o gdt.o interrupts.o loader.o serial.o framebuffer.o ports.o stlio.o tests.o
+OBJECTS=mem.o kernel.o gdt_seg.o gdt.o interrupts.o loader.o serial.o \
+		framebuffer.o ports.o stlio.o tests.o
 AFLAGS=-f elf32
 CFLAGS=-masm=intel -O2 -m32 -nostdlib -nostdinc -fno-builtin -fno-stack-protector -nostartfiles \
 		-nodefaultlibs -Wall -Wextra -Werror -c