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)
29 __asm__( "1: lwarx 10, 0, %1\n"
33 : "=r"(t) : "r"(p), "r"(t), "r"(s) : "memory" );
37 static inline void *a_cas_p(volatile void *p, void *t, void *s)
39 return (void *)a_cas(p, (int)t, (int)s);
42 static inline long a_cas_l(volatile void *p, long t, long s)
44 return a_cas(p, t, s);
48 static inline int a_swap(volatile int *x, int v)
52 while (a_cas(x, old, v) != old);
56 static inline int a_fetch_add(volatile int *x, int v)
60 while (a_cas(x, old, old+v) != old);
64 static inline void a_inc(volatile int *x)
69 static inline void a_dec(volatile int *x)
74 static inline void a_store(volatile int *p, int x)
79 static inline void a_spin()
83 static inline void a_crash()
85 *(volatile char *)0=0;
88 static inline void a_and(volatile int *p, int v)
92 while (a_cas(p, old, old&v) != old);
95 static inline void a_or(volatile int *p, int v)
99 while (a_cas(p, old, old|v) != old);
102 static inline void a_and_64(volatile uint64_t *p, uint64_t v)
104 #if __BYTE_ORDER == __LITTLE_ENDIAN
106 a_and((int *)p+1, v>>32);
108 a_and((int *)p+1, v);
109 a_and((int *)p, v>>32);
113 static inline void a_or_64(volatile uint64_t *p, uint64_t v)
115 #if __BYTE_ORDER == __LITTLE_ENDIAN
117 a_or((int *)p+1, v>>32);
120 a_or((int *)p, v>>32);