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}