1#define a_ll a_ll
 2static inline int a_ll(volatile int *p)
 3{
 4	int v;
 5	__asm__ __volatile__ ("ldaxr %w0,%1" : "=r"(v) : "Q"(*p));
 6	return v;
 7}
 8
 9#define a_sc a_sc
10static inline int a_sc(volatile int *p, int v)
11{
12	int r;
13	__asm__ __volatile__ ("stlxr %w0,%w2,%1" : "=&r"(r), "=Q"(*p) : "r"(v) : "memory");
14	return !r;
15}
16
17#define a_barrier a_barrier
18static inline void a_barrier()
19{
20	__asm__ __volatile__ ("dmb ish" : : : "memory");
21}
22
23#define a_cas a_cas
24static inline int a_cas(volatile int *p, int t, int s)
25{
26	int old;
27	do {
28		old = a_ll(p);
29		if (old != t) {
30			a_barrier();
31			break;
32		}
33	} while (!a_sc(p, s));
34	return old;
35}
36
37#define a_ll_p a_ll_p
38static inline void *a_ll_p(volatile void *p)
39{
40	void *v;
41	__asm__ __volatile__ ("ldaxr %0, %1" : "=r"(v) : "Q"(*(void *volatile *)p));
42	return v;
43}
44
45#define a_sc_p a_sc_p
46static inline int a_sc_p(volatile int *p, void *v)
47{
48	int r;
49	__asm__ __volatile__ ("stlxr %w0,%2,%1" : "=&r"(r), "=Q"(*(void *volatile *)p) : "r"(v) : "memory");
50	return !r;
51}
52
53#define a_cas_p a_cas_p
54static inline void *a_cas_p(volatile void *p, void *t, void *s)
55{
56	void *old;
57	do {
58		old = a_ll_p(p);
59		if (old != t) {
60			a_barrier();
61			break;
62		}
63	} while (!a_sc_p(p, s));
64	return old;
65}
66
67#define a_ctz_64 a_ctz_64
68static inline int a_ctz_64(uint64_t x)
69{
70	__asm__(
71		"	rbit %0, %1\n"
72		"	clz %0, %0\n"
73		: "=r"(x) : "r"(x));
74	return x;
75}
76
77#define a_clz_64 a_clz_64
78static inline int a_clz_64(uint64_t x)
79{
80	__asm__("clz %0, %1" : "=r"(x) : "r"(x));
81	return x;
82}