1 #ifndef _INTERNAL_ATOMIC_H
2 #define _INTERNAL_ATOMIC_H
7 static inline int a_ctz_l(unsigned long x)
9 static const char debruijn32[32] = {
10 0, 1, 23, 2, 29, 24, 19, 3, 30, 27, 25, 11, 20, 8, 4, 13,
11 31, 22, 28, 18, 26, 10, 7, 12, 21, 17, 9, 6, 16, 5, 15, 14
13 return debruijn32[(x&-x)*0x076be629 >> 27];
16 static inline int a_ctz_64(uint64_t x)
21 return 32 + a_ctz_l(y);
26 static inline int a_cas(volatile int *p, int t, int s)
30 "1: lwarx %0, 0, %4\n"
37 : "=&r"(t), "+m"(*p) : "r"(t), "r"(s), "r"(p) : "cc", "memory" );
41 static inline void *a_cas_p(volatile void *p, void *t, void *s)
43 return (void *)a_cas(p, (int)t, (int)s);
46 static inline int a_swap(volatile int *x, int v)
50 while (a_cas(x, old, v) != old);
54 static inline int a_fetch_add(volatile int *x, int v)
58 while (a_cas(x, old, old+v) != old);
62 static inline void a_inc(volatile int *x)
67 static inline void a_dec(volatile int *x)
72 static inline void a_store(volatile int *p, int x)
74 __asm__ __volatile__ ("\n"
78 : "=m"(*p) : "r"(x) : "memory" );
81 #define a_spin a_barrier
83 static inline void a_barrier()
85 a_cas(&(int){0}, 0, 0);
88 static inline void a_crash()
90 *(volatile char *)0=0;
93 static inline void a_and(volatile int *p, int v)
97 while (a_cas(p, old, old&v) != old);
100 static inline void a_or(volatile int *p, int v)
104 while (a_cas(p, old, old|v) != old);
107 static inline void a_or_l(volatile void *p, long v)
112 static inline void a_and_64(volatile uint64_t *p, uint64_t v)
114 union { uint64_t v; uint32_t r[2]; } u = { v };
115 a_and((int *)p, u.r[0]);
116 a_and((int *)p+1, u.r[1]);
119 static inline void a_or_64(volatile uint64_t *p, uint64_t v)
121 union { uint64_t v; uint32_t r[2]; } u = { v };
122 a_or((int *)p, u.r[0]);
123 a_or((int *)p+1, u.r[1]);