diff --git a/vl.h b/vl.h
index 6bb131c..ebe715f 100644
--- a/vl.h
+++ b/vl.h
@@ -168,6 +168,15 @@
 void vm_stop(int reason);
 
 extern int audio_enabled;
+extern int ram_size;
+extern int bios_size;
+
+/* XXX: make it dynamic */
+#if defined (TARGET_PPC)
+#define BIOS_SIZE (512 * 1024)
+#else
+#define BIOS_SIZE 0
+#endif
 
 /* async I/O support */