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)
28 __asm__("1: lwarx %0, 0, %1\n"
34 : "=&r"(t) : "r"(p), "r"(t), "r"(s) : "cc", "memory" );
38 static inline void *a_cas_p(volatile void *p, void *t, void *s)
40 return (void *)a_cas(p, (int)t, (int)s);
43 static inline long a_cas_l(volatile void *p, long t, long s)
45 return a_cas(p, t, s);
49 static inline int a_swap(volatile int *x, int v)
53 while (a_cas(x, old, v) != old);
57 static inline int a_fetch_add(volatile int *x, int v)
61 while (a_cas(x, old, old+v) != old);
65 static inline void a_inc(volatile int *x)
70 static inline void a_dec(volatile int *x)
75 static inline void a_store(volatile int *p, int x)
80 static inline void a_spin()
84 static inline void a_crash()
86 *(volatile char *)0=0;
89 static inline void a_and(volatile int *p, int v)
93 while (a_cas(p, old, old&v) != old);
96 static inline void a_or(volatile int *p, int v)
100 while (a_cas(p, old, old|v) != old);
103 static inline void a_or_l(volatile void *p, long v)
108 static inline void a_and_64(volatile uint64_t *p, uint64_t v)
110 union { uint64_t v; uint32_t r[2]; } u = { v };
111 a_and((int *)p, u.r[0]);
112 a_and((int *)p+1, u.r[1]);
115 static inline void a_or_64(volatile uint64_t *p, uint64_t v)
117 union { uint64_t v; uint32_t r[2]; } u = { v };
118 a_or((int *)p, u.r[0]);
119 a_or((int *)p+1, u.r[1]);