arch/sparc/include/asm/atomic_64.h

   1 /* atomic.h: Thankfully the V9 is at least reasonable for this
   2  *           stuff.
   3  *
   4  * Copyright (C) 1996, 1997, 2000, 2012 David S. Miller (davem@redhat.com)
   5  */
   6
   7 #ifndef __ARCH_SPARC64_ATOMIC__
   8 #define __ARCH_SPARC64_ATOMIC__
   9
  10 #include <linux/types.h>
  11 #include <asm/cmpxchg.h>
  12 #include <asm/barrier.h>
  13
  14 #define ATOMIC_INIT(i)          { (i) }
  15 #define ATOMIC64_INIT(i)        { (i) }
  16
  17 #define atomic_read(v)          READ_ONCE((v)->counter)
  18 #define atomic64_read(v)        READ_ONCE((v)->counter)
  19
  20 #define atomic_set(v, i)        WRITE_ONCE(((v)->counter), (i))
  21 #define atomic64_set(v, i)      WRITE_ONCE(((v)->counter), (i))
  22
  23 #define ATOMIC_OP(op)                                                   \
  24 void atomic_##op(int, atomic_t *);                                      \
  25 void atomic64_##op(long, atomic64_t *);
  26
  27 #define ATOMIC_OP_RETURN(op)                                            \
  28 int atomic_##op##_return(int, atomic_t *);                              \
  29 long atomic64_##op##_return(long, atomic64_t *);
  30
  31 #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op)
  32
  33 ATOMIC_OPS(add)
  34 ATOMIC_OPS(sub)
  35
  36 ATOMIC_OP(and)
  37 ATOMIC_OP(or)
  38 ATOMIC_OP(xor)
  39
  40 #undef ATOMIC_OPS
  41 #undef ATOMIC_OP_RETURN
  42 #undef ATOMIC_OP
  43
  44 #define atomic_dec_return(v)   atomic_sub_return(1, v)
  45 #define atomic64_dec_return(v) atomic64_sub_return(1, v)
  46
  47 #define atomic_inc_return(v)   atomic_add_return(1, v)
  48 #define atomic64_inc_return(v) atomic64_add_return(1, v)
  49
  50 /*
  51  * atomic_inc_and_test - increment and test
  52  * @v: pointer of type atomic_t
  53  *
  54  * Atomically increments @v by 1
  55  * and returns true if the result is zero, or false for all
  56  * other cases.
  57  */
  58 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
  59 #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
  60
  61 #define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
  62 #define atomic64_sub_and_test(i, v) (atomic64_sub_return(i, v) == 0)
  63
  64 #define atomic_dec_and_test(v) (atomic_sub_return(1, v) == 0)
  65 #define atomic64_dec_and_test(v) (atomic64_sub_return(1, v) == 0)
  66
  67 #define atomic_inc(v) atomic_add(1, v)
  68 #define atomic64_inc(v) atomic64_add(1, v)
  69
  70 #define atomic_dec(v) atomic_sub(1, v)
  71 #define atomic64_dec(v) atomic64_sub(1, v)
  72
  73 #define atomic_add_negative(i, v) (atomic_add_return(i, v) < 0)
  74 #define atomic64_add_negative(i, v) (atomic64_add_return(i, v) < 0)
  75
  76 #define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
  77 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
  78
  79 static inline int __atomic_add_unless(atomic_t *v, int a, int u)
  80 {
  81         int c, old;
  82         c = atomic_read(v);
  83         for (;;) {
  84                 if (unlikely(c == (u)))
  85                         break;
  86                 old = atomic_cmpxchg((v), c, c + (a));
  87                 if (likely(old == c))
  88                         break;
  89                 c = old;
  90         }
  91         return c;
  92 }
  93
  94 #define atomic64_cmpxchg(v, o, n) \
  95         ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
  96 #define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
  97
  98 static inline long atomic64_add_unless(atomic64_t *v, long a, long u)
  99 {
 100         long c, old;
 101         c = atomic64_read(v);
 102         for (;;) {
 103                 if (unlikely(c == (u)))
 104                         break;
 105                 old = atomic64_cmpxchg((v), c, c + (a));
 106                 if (likely(old == c))
 107                         break;
 108                 c = old;
 109         }
 110         return c != (u);
 111 }
 112
 113 #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
 114
 115 long atomic64_dec_if_positive(atomic64_t *v);
 116
 117 #endif /* !(__ARCH_SPARC64_ATOMIC__) */