LXR linux/arch/sparc/include/asm/atomic

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/* atomic.h: Thankfully the V9 is at least reasonable for this
   3 *           stuff.
   4 *
   5 * Copyright (C) 1996, 1997, 2000, 2012 David S. Miller (davem@redhat.com)
   6 */
   7
   8#ifndef __ARCH_SPARC64_ATOMIC__
   9#define __ARCH_SPARC64_ATOMIC__
  10
  11#include <linux/types.h>
  12#include <asm/cmpxchg.h>
  13#include <asm/barrier.h>
  14
  15#define ATOMIC_INIT(i)          { (i) }
  16#define ATOMIC64_INIT(i)        { (i) }
  17
  18#define atomic_read(v)          READ_ONCE((v)->counter)
  19#define atomic64_read(v)        READ_ONCE((v)->counter)
  20
  21#define atomic_set(v, i)        WRITE_ONCE(((v)->counter), (i))
  22#define atomic64_set(v, i)      WRITE_ONCE(((v)->counter), (i))
  23
  24#define ATOMIC_OP(op)                                                   \
  25void atomic_##op(int, atomic_t *);                                      \
  26void atomic64_##op(s64, atomic64_t *);
  27
  28#define ATOMIC_OP_RETURN(op)                                            \
  29int atomic_##op##_return(int, atomic_t *);                              \
  30s64 atomic64_##op##_return(s64, atomic64_t *);
  31
  32#define ATOMIC_FETCH_OP(op)                                             \
  33int atomic_fetch_##op(int, atomic_t *);                                 \
  34s64 atomic64_fetch_##op(s64, atomic64_t *);
  35
  36#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) ATOMIC_FETCH_OP(op)
  37
  38ATOMIC_OPS(add)
  39ATOMIC_OPS(sub)
  40
  41#undef ATOMIC_OPS
  42#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op)
  43
  44ATOMIC_OPS(and)
  45ATOMIC_OPS(or)
  46ATOMIC_OPS(xor)
  47
  48#undef ATOMIC_OPS
  49#undef ATOMIC_FETCH_OP
  50#undef ATOMIC_OP_RETURN
  51#undef ATOMIC_OP
  52
  53#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
  54
  55static inline int atomic_xchg(atomic_t *v, int new)
  56{
  57        return xchg(&v->counter, new);
  58}
  59
  60#define atomic64_cmpxchg(v, o, n) \
  61        ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
  62#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
  63
  64s64 atomic64_dec_if_positive(atomic64_t *v);
  65#define atomic64_dec_if_positive atomic64_dec_if_positive
  66
  67#endif /* !(__ARCH_SPARC64_ATOMIC__) */
  68