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 #if __ARM_ARCH_7A__ || __ARM_ARCH_7R__ || __ARM_ARCH >= 7
27 static inline void a_barrier()
29 __asm__ __volatile__("dmb ish");
32 static inline int a_cas(volatile int *p, int t, int s)
46 : "r"(t), "r"(s), "Q"(*p)
51 static inline int a_swap(volatile int *x, int v)
61 : "=&r"(old), "=&r"(tmp)
67 static inline int a_fetch_add(volatile int *x, int v)
78 : "=&r"(old), "=&r"(tmp)
84 static inline void a_inc(volatile int *x)
95 : "=&r"(tmp), "=&r"(tmp2)
100 static inline void a_dec(volatile int *x)
103 __asm__ __volatile__(
111 : "=&r"(tmp), "=&r"(tmp2)
116 static inline void a_and(volatile int *x, int v)
119 __asm__ __volatile__(
127 : "=&r"(tmp), "=&r"(tmp2)
132 static inline void a_or(volatile int *x, int v)
135 __asm__ __volatile__(
143 : "=&r"(tmp), "=&r"(tmp2)
148 static inline void a_store(volatile int *p, int x)
150 __asm__ __volatile__(
161 int __a_cas(int, int, volatile int *) __attribute__((__visibility__("hidden")));
162 #define __k_cas __a_cas
164 static inline void a_barrier()
166 __asm__ __volatile__("bl __a_barrier"
167 : : : "memory", "cc", "ip", "lr" );
170 static inline int a_cas(volatile int *p, int t, int s)
174 if (!__k_cas(t, s, p))
181 static inline int a_swap(volatile int *x, int v)
185 while (__k_cas(old, v, x));
189 static inline int a_fetch_add(volatile int *x, int v)
193 while (__k_cas(old, old+v, x));
197 static inline void a_inc(volatile int *x)
202 static inline void a_dec(volatile int *x)
207 static inline void a_store(volatile int *p, int x)
214 static inline void a_and(volatile int *p, int v)
218 while (__k_cas(old, old&v, p));
221 static inline void a_or(volatile int *p, int v)
225 while (__k_cas(old, old|v, p));
230 static inline void *a_cas_p(volatile void *p, void *t, void *s)
232 return (void *)a_cas(p, (int)t, (int)s);
235 #define a_spin a_barrier
237 static inline void a_crash()
239 *(volatile char *)0=0;
242 static inline void a_or_l(volatile void *p, long v)
247 static inline void a_and_64(volatile uint64_t *p, uint64_t v)
249 union { uint64_t v; uint32_t r[2]; } u = { v };
250 a_and((int *)p, u.r[0]);
251 a_and((int *)p+1, u.r[1]);
254 static inline void a_or_64(volatile uint64_t *p, uint64_t v)
256 union { uint64_t v; uint32_t r[2]; } u = { v };
257 a_or((int *)p, u.r[0]);
258 a_or((int *)p+1, u.r[1]);