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diff --git a/udelay.h b/udelay.h
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+/* $Id: udelay.h 1126 2010-07-13 03:25:44Z michael $
+ * $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/udelay.h $
+ *
+ * short delays 
+ *
+ * Copyright (C) 1999, 2000 Michael Reinelt <michael@reinelt.co.at>
+ * Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
+ *
+ * This file is part of LCD4Linux.
+ *
+ * LCD4Linux is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * LCD4Linux is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#ifndef _UDELAY_H_
+#define _UDELAY_H_
+
+/* stolen from linux/asm-i386/processor.h */
+/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
+static inline void rep_nop(void)
+{
+#if defined(__i386) || defined(__i386__) || defined(__AMD64__) || defined(__x86_64__) || defined(__amd64__)
+    /* intel or amd64 arch, the "rep" and "nop" opcodes are available */
+    __asm__ __volatile__("rep; nop");
+#else
+    /* other Arch, maybe add core cooldown code here, too. */
+    do {
+    } while (0);
+#endif
+}
+
+void udelay_init(void);
+unsigned long timing(const char *driver, const char *section, const char *name, const int defval, const char *unit);
+void ndelay(const unsigned long nsec);
+
+#define udelay(usec) ndelay(usec*1000)
+
+#endif