1 #ifndef _INTERNAL_ATOMIC_H
2 #define _INTERNAL_ATOMIC_H
6 static inline int a_ctz_l(unsigned long x)
8 static const char debruijn32[32] = {
9 0, 1, 23, 2, 29, 24, 19, 3, 30, 27, 25, 11, 20, 8, 4, 13,
10 31, 22, 28, 18, 26, 10, 7, 12, 21, 17, 9, 6, 16, 5, 15, 14
12 return debruijn32[(x&-x)*0x076be629 >> 27];
15 static inline int a_ctz_64(uint64_t x)
20 return 32 + a_ctz_l(y);
25 static inline int a_cas(volatile int *p, int t, int s)
27 __asm__("1: l.lwa %0, %1\n"
35 : "=&r"(t), "+m"(*p) : "r"(t), "r"(s) : "cc", "memory" );
39 static inline void *a_cas_p(volatile void *p, void *t, void *s)
41 return (void *)a_cas(p, (int)t, (int)s);
44 static inline int a_swap(volatile int *x, int v)
48 while (a_cas(x, old, v) != old);
52 static inline int a_fetch_add(volatile int *x, int v)
56 while (a_cas(x, old, old+v) != old);
60 static inline void a_inc(volatile int *x)
65 static inline void a_dec(volatile int *x)
70 static inline void a_store(volatile int *p, int x)
75 #define a_spin a_barrier
77 static inline void a_barrier()
79 a_cas(&(int){0}, 0, 0);
82 static inline void a_crash()
84 *(volatile char *)0=0;
87 static inline void a_and(volatile int *p, int v)
91 while (a_cas(p, old, old&v) != old);
94 static inline void a_or(volatile int *p, int v)
98 while (a_cas(p, old, old|v) != old);
101 static inline void a_or_l(volatile void *p, long v)
106 static inline void a_and_64(volatile uint64_t *p, uint64_t v)
108 union { uint64_t v; uint32_t r[2]; } u = { v };
109 a_and((int *)p, u.r[0]);
110 a_and((int *)p+1, u.r[1]);
113 static inline void a_or_64(volatile uint64_t *p, uint64_t v)
115 union { uint64_t v; uint32_t r[2]; } u = { v };
116 a_or((int *)p, u.r[0]);
117 a_or((int *)p+1, u.r[1]);