diff --git a/asm.h b/asm.h
new file mode 100644
index 0000000..5986ec7
--- /dev/null
+++ b/asm.h
@@ -0,0 +1,14 @@
+#define SEG_NULL						\
+	.word 0, 0;						\
+	.byte 0, 0, 0, 0
+#define SEG(type,base,lim)					\
+	.word (((lim) >> 12) & 0xffff), ((base) & 0xffff);	\
+	.byte (((base) >> 16) & 0xff), (0x90 | (type)),		\
+		(0xC0 | (((lim) >> 28) & 0xf)), (((base) >> 24) & 0xff)
+
+#define STA_X		0x8	    // Executable segment
+#define STA_E		0x4	    // Expand down (non-executable segments)
+#define STA_C		0x4	    // Conforming code segment (executable only)
+#define STA_W		0x2	    // Writeable (non-executable segments)
+#define STA_R		0x2	    // Readable (executable segments)
+#define STA_A		0x1	    // Accessed
diff --git a/main.c b/main.c
index 0a43b85..5b17297 100644
--- a/main.c
+++ b/main.c
@@ -34,6 +34,8 @@ main()
   tinit(); // traps and interrupts
   pic_init();
 
+  while (1);
+
   // create fake process zero
   p = &proc[0];
   curproc = p;