1 #ifndef __XEN_SYNCH_BITOPS_H__
2 #define __XEN_SYNCH_BITOPS_H__
5 * Copyright 1992, Linus Torvalds.
6 * Heavily modified to provide guaranteed strong synchronisation
7 * when communicating with Xen or other guest OSes running on other CPUs.
10 #define ADDR (*(volatile long *) addr)
12 static __inline__ void synch_set_bit(int nr, volatile void * addr)
17 static __inline__ void synch_clear_bit(int nr, volatile void * addr)
22 static __inline__ void synch_change_bit(int nr, volatile void * addr)
27 static __inline__ int synch_test_and_set_bit(int nr, volatile void * addr)
29 return test_and_set_bit(nr, addr);
32 static __inline__ int synch_test_and_clear_bit(int nr, volatile void * addr)
34 return test_and_clear_bit(nr, addr);
37 static __inline__ int synch_test_and_change_bit(int nr, volatile void * addr)
39 return test_and_change_bit(nr, addr);
42 static __inline__ int synch_const_test_bit(int nr, const volatile void * addr)
44 return test_bit(nr, addr);
47 static __inline__ int synch_var_test_bit(int nr, volatile void * addr)
49 return test_bit(nr, addr);
52 #define synch_cmpxchg ia64_cmpxchg4_acq
54 #define synch_test_bit(nr,addr) \
55 (__builtin_constant_p(nr) ? \
56 synch_const_test_bit((nr),(addr)) : \
57 synch_var_test_bit((nr),(addr)))
59 #define synch_cmpxchg_subword synch_cmpxchg
61 #endif /* __XEN_SYNCH_BITOPS_H__ */