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_1(volatile int *p, int t, int s)
29 __asm__ __volatile__ ("lwx %0, %1, r0"
30 : "=r"(tmp) : "r"(p) : "memory");
31 if (tmp != t) return tmp;
32 __asm__ __volatile__ ("swx %2, %1, r0 ; addic %0, r0, 0"
33 : "=r"(tmp) : "r"(p), "r"(s) : "cc", "memory");
38 static inline int a_cas(volatile int *p, int t, int s)
40 register int old, tmp;
41 __asm__ __volatile__ (
50 : "=&r"(old), "=&r"(tmp)
51 : "r"(p), "r"(t), "r"(s)
56 static inline void *a_cas_p(volatile void *p, void *t, void *s)
58 return (void *)a_cas(p, (int)t, (int)s);
61 static inline long a_cas_l(volatile void *p, long t, long s)
63 return a_cas(p, t, s);
66 static inline int a_swap(volatile int *x, int v)
68 register int old, tmp;
69 __asm__ __volatile__ (
76 : "=&r"(old), "=&r"(tmp)
82 static inline int a_fetch_add(volatile int *x, int v)
84 register int new, tmp;
85 __asm__ __volatile__ (
93 : "=&r"(new), "=&r"(tmp)
99 static inline void a_inc(volatile int *x)
104 static inline void a_dec(volatile int *x)
109 static inline void a_store(volatile int *p, int x)
114 static inline void a_spin()
118 static inline void a_crash()
120 *(volatile char *)0=0;
123 static inline void a_and(volatile int *p, int v)
127 while (a_cas(p, old, old&v) != old);
130 static inline void a_or(volatile int *p, int v)
134 while (a_cas(p, old, old|v) != old);
137 static inline void a_or_l(volatile void *p, long v)
142 static inline void a_and_64(volatile uint64_t *p, uint64_t v)
144 union { uint64_t v; uint32_t r[2]; } u = { v };
145 a_and((int *)p, u.r[0]);
146 a_and((int *)p+1, u.r[1]);
149 static inline void a_or_64(volatile uint64_t *p, uint64_t v)
151 union { uint64_t v; uint32_t r[2]; } u = { v };
152 a_or((int *)p, u.r[0]);
153 a_or((int *)p+1, u.r[1]);