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_6__ || __ARM_ARCH_6K__ || __ARM_ARCH_6ZK__ \
26 || __ARM_ARCH_7A__ || __ARM_ARCH_7R__ \
29 #if __ARM_ARCH_7A__ || __ARM_ARCH_7R__ || __ARM_ARCH >= 7
30 #define MEM_BARRIER "dmb ish"
32 #define MEM_BARRIER "mcr p15,0,r0,c7,c10,5"
35 static inline int __k_cas(int t, int s, volatile int *p)
47 : "r"(t), "r"(s), "Q"(*p)
52 #define __k_cas ((int (*)(int, int, volatile int *))0xffff0fc0)
55 static inline int a_cas(volatile int *p, int t, int s)
59 if (!__k_cas(t, s, p))
66 static inline void *a_cas_p(volatile void *p, void *t, void *s)
68 return (void *)a_cas(p, (int)t, (int)s);
71 static inline long a_cas_l(volatile void *p, long t, long s)
73 return a_cas(p, t, s);
76 static inline int a_swap(volatile int *x, int v)
80 while (__k_cas(old, v, x));
84 static inline int a_fetch_add(volatile int *x, int v)
88 while (__k_cas(old, old+v, x));
92 static inline void a_inc(volatile int *x)
97 static inline void a_dec(volatile int *x)
102 static inline void a_store(volatile int *p, int x)
104 while (__k_cas(*p, x, p));
107 static inline void a_spin()
111 static inline void a_crash()
113 *(volatile char *)0=0;
116 static inline void a_and(volatile int *p, int v)
120 while (__k_cas(old, old&v, p));
123 static inline void a_or(volatile int *p, int v)
127 while (__k_cas(old, old|v, p));
130 static inline void a_or_l(volatile void *p, long v)
135 static inline void a_and_64(volatile uint64_t *p, uint64_t v)
137 union { uint64_t v; uint32_t r[2]; } u = { v };
138 a_and((int *)p, u.r[0]);
139 a_and((int *)p+1, u.r[1]);
142 static inline void a_or_64(volatile uint64_t *p, uint64_t v)
144 union { uint64_t v; uint32_t r[2]; } u = { v };
145 a_or((int *)p, u.r[0]);
146 a_or((int *)p+1, u.r[1]);