diff --git a/include/ia64/rse.h b/include/ia64/rse.h
index e69de29b..928f1a63 100644
--- a/include/ia64/rse.h
+++ b/include/ia64/rse.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 1998, 1999, 2002, 2003 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ *
+ * Register stack engine related helper functions.  This file may be
+ * used in applications, so be careful about the name-space and give
+ * some consideration to non-GNU C compilers (though __inline__ is
+ * fine).
+ */
+#ifndef RSE_H
+#define RSE_H
+
+#include "internal.h"
+
+#include <inttypes.h>
+
+static inline uint64_t
+ia64_rse_slot_num (uint64_t addr)
+{
+	return (addr >> 3) & 0x3f;
+}
+
+/*
+ * Return TRUE if ADDR is the address of an RNAT slot.
+ */
+static inline uint64_t
+ia64_rse_is_rnat_slot (uint64_t addr)
+{
+	return ia64_rse_slot_num (addr) == 0x3f;
+}
+
+/*
+ * Returns the address of the RNAT slot that covers the slot at
+ * address SLOT_ADDR.
+ */
+static inline uint64_t
+ia64_rse_rnat_addr (uint64_t slot_addr)
+{
+	return slot_addr | (0x3f << 3);
+}
+
+/*
+ * Calcuate the number of registers in the dirty partition starting at
+ * BSPSTORE and ending at BSP.  This isn't simply (BSP-BSPSTORE)/8
+ * because every 64th slot stores ar.rnat.
+ */
+static inline uint64_t
+ia64_rse_num_regs (uint64_t bspstore, uint64_t bsp)
+{
+	uint64_t slots = (bsp - bspstore) >> 3;
+
+	return slots - (ia64_rse_slot_num(bspstore) + slots)/0x40;
+}
+
+/*
+ * The inverse of the above: given bspstore and the number of
+ * registers, calculate ar.bsp.
+ */
+static inline uint64_t
+ia64_rse_skip_regs (uint64_t addr, long num_regs)
+{
+	long delta = ia64_rse_slot_num(addr) + num_regs;
+
+	if (num_regs < 0)
+		delta -= 0x3e;
+	return addr + ((num_regs + delta/0x3f) << 3);
+}
+
+#endif /* RSE_H */