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)          (*(volatile int *)&(v)->counter)
  18 #define atomic64_read(v)        (*(volatile long *)&(v)->counter)
  19
  20 #define atomic_set(v, i)        (((v)->counter) = i)
  21 #define atomic64_set(v, i)      (((v)->counter) = i)
  22
  23 void atomic_add(int, atomic_t *);
  24 void atomic64_add(long, atomic64_t *);
  25 void atomic_sub(int, atomic_t *);
  26 void atomic64_sub(long, atomic64_t *);
  27
  28 int atomic_add_ret(int, atomic_t *);
  29 long atomic64_add_ret(long, atomic64_t *);
  30 int atomic_sub_ret(int, atomic_t *);
  31 long atomic64_sub_ret(long, atomic64_t *);
  32
  33 #define atomic_dec_return(v) atomic_sub_ret(1, v)
  34 #define atomic64_dec_return(v) atomic64_sub_ret(1, v)
  35
  36 #define atomic_inc_return(v) atomic_add_ret(1, v)
  37 #define atomic64_inc_return(v) atomic64_add_ret(1, v)
  38
  39 #define atomic_sub_return(i, v) atomic_sub_ret(i, v)
  40 #define atomic64_sub_return(i, v) atomic64_sub_ret(i, v)
  41
  42 #define atomic_add_return(i, v) atomic_add_ret(i, v)
  43 #define atomic64_add_return(i, v) atomic64_add_ret(i, v)
  44
  45 /*
  46  * atomic_inc_and_test - increment and test
  47  * @v: pointer of type atomic_t
  48  *
  49  * Atomically increments @v by 1
  50  * and returns true if the result is zero, or false for all
  51  * other cases.
  52  */
  53 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
  54 #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
  55
  56 #define atomic_sub_and_test(i, v) (atomic_sub_ret(i, v) == 0)
  57 #define atomic64_sub_and_test(i, v) (atomic64_sub_ret(i, v) == 0)
  58
  59 #define atomic_dec_and_test(v) (atomic_sub_ret(1, v) == 0)
  60 #define atomic64_dec_and_test(v) (atomic64_sub_ret(1, v) == 0)
  61
  62 #define atomic_inc(v) atomic_add(1, v)
  63 #define atomic64_inc(v) atomic64_add(1, v)
  64
  65 #define atomic_dec(v) atomic_sub(1, v)
  66 #define atomic64_dec(v) atomic64_sub(1, v)
  67
  68 #define atomic_add_negative(i, v) (atomic_add_ret(i, v) < 0)
  69 #define atomic64_add_negative(i, v) (atomic64_add_ret(i, v) < 0)
  70
  71 #define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
  72 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
  73
  74 static inline int __atomic_add_unless(atomic_t *v, int a, int u)
  75 {
  76         int c, old;
  77         c = atomic_read(v);
  78         for (;;) {
  79                 if (unlikely(c == (u)))
  80                         break;
  81                 old = atomic_cmpxchg((v), c, c + (a));
  82                 if (likely(old == c))
  83                         break;
  84                 c = old;
  85         }
  86         return c;
  87 }
  88
  89 #define atomic64_cmpxchg(v, o, n) \
  90         ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
  91 #define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
  92
  93 static inline long atomic64_add_unless(atomic64_t *v, long a, long u)
  94 {
  95         long c, old;
  96         c = atomic64_read(v);
  97         for (;;) {
  98                 if (unlikely(c == (u)))
  99                         break;
 100                 old = atomic64_cmpxchg((v), c, c + (a));
 101                 if (likely(old == c))
 102                         break;
 103                 c = old;
 104         }
 105         return c != (u);
 106 }
 107
 108 #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
 109
 110 long atomic64_dec_if_positive(atomic64_t *v);
 111
 112 #endif /* !(__ARCH_SPARC64_ATOMIC__) */