1 #define a_ll a_ll
a_ll(volatile int * p)2 static 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_ldar a_ldar
a_ldar(volatile int * p)10 static inline int a_ldar(volatile int *p)
11 {
12 int v;
13 __asm__ __volatile__ ("ldar %w0,%1" : "=r"(v) : "Q"(*p));
14 return v;
15 }
16
17 #define a_sc a_sc
a_sc(volatile int * p,int v)18 static inline int a_sc(volatile int *p, int v)
19 {
20 int r;
21 __asm__ __volatile__ ("stlxr %w0,%w2,%1" : "=&r"(r), "=Q"(*p) : "r"(v) : "memory");
22 return !r;
23 }
24
25 #define a_barrier a_barrier
a_barrier()26 static inline void a_barrier()
27 {
28 __asm__ __volatile__ ("dmb ish" : : : "memory");
29 }
30
31 #define a_cas a_cas
a_cas(volatile int * p,int t,int s)32 static inline int a_cas(volatile int *p, int t, int s)
33 {
34 int old;
35 do {
36 old = a_ll(p);
37 if (old != t) {
38 a_barrier();
39 break;
40 }
41 } while (!a_sc(p, s));
42 return old;
43 }
44
45 #define a_ll_p a_ll_p
a_ll_p(volatile void * p)46 static inline void *a_ll_p(volatile void *p)
47 {
48 void *v;
49 __asm__ __volatile__ ("ldaxr %0, %1" : "=r"(v) : "Q"(*(void *volatile *)p));
50 return v;
51 }
52
53 #define a_sc_p a_sc_p
a_sc_p(volatile int * p,void * v)54 static inline int a_sc_p(volatile int *p, void *v)
55 {
56 int r;
57 __asm__ __volatile__ ("stlxr %w0,%2,%1" : "=&r"(r), "=Q"(*(void *volatile *)p) : "r"(v) : "memory");
58 return !r;
59 }
60
61 #define a_cas_p a_cas_p
a_cas_p(volatile void * p,void * t,void * s)62 static inline void *a_cas_p(volatile void *p, void *t, void *s)
63 {
64 void *old;
65 do {
66 old = a_ll_p(p);
67 if (old != t) {
68 a_barrier();
69 break;
70 }
71 } while (!a_sc_p(p, s));
72 return old;
73 }
74
75 #define a_ctz_64 a_ctz_64
a_ctz_64(uint64_t x)76 static inline int a_ctz_64(uint64_t x)
77 {
78 __asm__(
79 " rbit %0, %1\n"
80 " clz %0, %0\n"
81 : "=r"(x) : "r"(x));
82 return x;
83 }
84
85 #define a_clz_64 a_clz_64
a_clz_64(uint64_t x)86 static inline int a_clz_64(uint64_t x)
87 {
88 __asm__("clz %0, %1" : "=r"(x) : "r"(x));
89 return x;
90 }
91