1 #ifndef _INTERNAL_ATOMIC_H 2 #define _INTERNAL_ATOMIC_H 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];
25 #if ((__ARM_ARCH_6__ || __ARM_ARCH_6K__ || __ARM_ARCH_6ZK__) && !__thumb__) \ 26 || __ARM_ARCH_7A__ || __ARM_ARCH_7R__ || __ARM_ARCH >= 7 28 #if __ARM_ARCH_7A__ || __ARM_ARCH_7R__ || __ARM_ARCH >= 7 29 #define MEM_BARRIER "dmb ish" 31 #define MEM_BARRIER "mcr p15,0,r0,c7,c10,5" 34 static inline int __k_cas(
int t,
int s,
volatile int *p)
49 :
"r"(t),
"r"(s),
"Q"(*p)
54 #define __k_cas ((int (*)(int, int, volatile int *))0xffff0fc0) 57 static inline int a_cas(
volatile int *p,
int t,
int s)
68 static inline void *
a_cas_p(
volatile void *p,
void *t,
void *s)
70 return (
void *)
a_cas(p, (
int)t, (
int)s);
73 static inline long a_cas_l(
volatile void *p,
long t,
long s)
75 return a_cas(p, t, s);
78 static inline int a_swap(
volatile int *
x,
int v)
94 static inline void a_inc(
volatile int *
x)
99 static inline void a_dec(
volatile int *
x)
115 *(
volatile char *)0=0;
118 static inline void a_and(
volatile int *p,
int v)
122 while (
__k_cas(old, old&v, p));
125 static inline void a_or(
volatile int *p,
int v)
129 while (
__k_cas(old, old|v, p));
132 static inline void a_or_l(
volatile void *p,
long v)
137 static inline void a_and_64(
volatile uint64_t *p, uint64_t v)
139 union { uint64_t v; uint32_t r[2]; } u = { v };
140 a_and((
int *)p, u.r[0]);
141 a_and((
int *)p+1, u.r[1]);
144 static inline void a_or_64(
volatile uint64_t *p, uint64_t v)
146 union { uint64_t v; uint32_t r[2]; } u = { v };
147 a_or((
int *)p, u.r[0]);
148 a_or((
int *)p+1, u.r[1]);
static void a_and(volatile int *p, int v)
static int a_fetch_add(volatile int *x, int v)
static void a_and_64(volatile uint64_t *p, uint64_t v)
static void a_inc(volatile int *x)
static void a_or(volatile int *p, int v)
static int a_ctz_64(uint64_t x)
static int a_ctz_l(unsigned long x)
static void a_store(volatile int *p, int x)
static void a_dec(volatile int *x)
static int a_swap(volatile int *x, int v)
static void a_or_l(volatile void *p, long v)
static void * a_cas_p(volatile void *p, void *t, void *s)
x
Return the smallest n such that 2^n >= _x.
static int a_cas(volatile int *p, int t, int s)
static long a_cas_l(volatile void *p, long t, long s)
static void a_or_64(volatile uint64_t *p, uint64_t v)