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_ldar a_ldar 10static 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 18static 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 26static inline void a_barrier() 27{ 28 __asm__ __volatile__ ("dmb ish" : : : "memory"); 29} 30 31#define a_cas a_cas 32static 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 46static 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 54static 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 62static 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 76static 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 86static inline int a_clz_64(uint64_t x) 87{ 88 __asm__("clz %0, %1" : "=r"(x) : "r"(x)); 89 return x; 90} 91