arch/sparc/include/asm/atomic_32.h

   1 /* atomic.h: These still suck, but the I-cache hit rate is higher.
   2  *
   3  * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
   4  * Copyright (C) 2000 Anton Blanchard (anton@linuxcare.com.au)
   5  * Copyright (C) 2007 Kyle McMartin (kyle@parisc-linux.org)
   6  *
   7  * Additions by Keith M Wesolowski (wesolows@foobazco.org) based
   8  * on asm-parisc/atomic.h Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>.
   9  */
  10
  11 #ifndef __ARCH_SPARC_ATOMIC__
  12 #define __ARCH_SPARC_ATOMIC__
  13
  14 #include <linux/types.h>
  15
  16 #include <asm/cmpxchg.h>
  17 #include <asm/barrier.h>
  18 #include <asm-generic/atomic64.h>
  19
  20 #define ATOMIC_INIT(i)  { (i) }
  21
  22 int atomic_add_return(int, atomic_t *);
  23 int atomic_fetch_add(int, atomic_t *);
  24 int atomic_fetch_and(int, atomic_t *);
  25 int atomic_fetch_or(int, atomic_t *);
  26 int atomic_fetch_xor(int, atomic_t *);
  27 int atomic_cmpxchg(atomic_t *, int, int);
  28 int atomic_xchg(atomic_t *, int);
  29 int __atomic_add_unless(atomic_t *, int, int);
  30 void atomic_set(atomic_t *, int);
  31
  32 #define atomic_set_release(v, i)        atomic_set((v), (i))
  33
  34 #define atomic_read(v)          READ_ONCE((v)->counter)
  35
  36 #define atomic_add(i, v)        ((void)atomic_add_return( (int)(i), (v)))
  37 #define atomic_sub(i, v)        ((void)atomic_add_return(-(int)(i), (v)))
  38 #define atomic_inc(v)           ((void)atomic_add_return(        1, (v)))
  39 #define atomic_dec(v)           ((void)atomic_add_return(       -1, (v)))
  40
  41 #define atomic_and(i, v)        ((void)atomic_fetch_and((i), (v)))
  42 #define atomic_or(i, v)         ((void)atomic_fetch_or((i), (v)))
  43 #define atomic_xor(i, v)        ((void)atomic_fetch_xor((i), (v)))
  44
  45 #define atomic_sub_return(i, v) (atomic_add_return(-(int)(i), (v)))
  46 #define atomic_fetch_sub(i, v)  (atomic_fetch_add (-(int)(i), (v)))
  47
  48 #define atomic_inc_return(v)    (atomic_add_return(        1, (v)))
  49 #define atomic_dec_return(v)    (atomic_add_return(       -1, (v)))
  50
  51 #define atomic_add_negative(a, v)       (atomic_add_return((a), (v)) < 0)
  52
  53 /*
  54  * atomic_inc_and_test - increment and test
  55  * @v: pointer of type atomic_t
  56  *
  57  * Atomically increments @v by 1
  58  * and returns true if the result is zero, or false for all
  59  * other cases.
  60  */
  61 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
  62
  63 #define atomic_dec_and_test(v) (atomic_dec_return(v) == 0)
  64 #define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
  65
  66 #endif /* !(__ARCH_SPARC_ATOMIC__) */