--- /dev/null
+#ifndef __XEN_SYNCH_BITOPS_H__
+#define __XEN_SYNCH_BITOPS_H__
+
+/*
+ * Copyright 1992, Linus Torvalds.
+ * Heavily modified to provide guaranteed strong synchronisation
+ * when communicating with Xen or other guest OSes running on other CPUs.
+ */
+
+#define ADDR (*(volatile long *) addr)
+
+static __inline__ void synch_set_bit(int nr, volatile void * addr)
+{
+ set_bit(nr, addr);
+}
+
+static __inline__ void synch_clear_bit(int nr, volatile void * addr)
+{
+ clear_bit(nr, addr);
+}
+
+static __inline__ void synch_change_bit(int nr, volatile void * addr)
+{
+ change_bit(nr, addr);
+}
+
+static __inline__ int synch_test_and_set_bit(int nr, volatile void * addr)
+{
+ return test_and_set_bit(nr, addr);
+}
+
+static __inline__ int synch_test_and_clear_bit(int nr, volatile void * addr)
+{
+ return test_and_clear_bit(nr, addr);
+}
+
+static __inline__ int synch_test_and_change_bit(int nr, volatile void * addr)
+{
+ return test_and_change_bit(nr, addr);
+}
+
+static __inline__ int synch_const_test_bit(int nr, const volatile void * addr)
+{
+ return test_bit(nr, addr);
+}
+
+static __inline__ int synch_var_test_bit(int nr, volatile void * addr)
+{
+ return test_bit(nr, addr);
+}
+
+#define synch_cmpxchg ia64_cmpxchg4_acq
+
+#define synch_test_bit(nr,addr) \
+(__builtin_constant_p(nr) ? \
+ synch_const_test_bit((nr),(addr)) : \
+ synch_var_test_bit((nr),(addr)))
+
+#define synch_cmpxchg_subword synch_cmpxchg
+
+#endif /* __XEN_SYNCH_BITOPS_H__ */