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  1. /*
  2.  * Generic implementation of 64-bit atomics using spinlocks,
  3.  * useful on processors that don't have 64-bit atomic instructions.
  4.  *
  5.  * Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
  6.  *
  7.  * This program is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU General Public License
  9.  * as published by the Free Software Foundation; either version
  10.  * 2 of the License, or (at your option) any later version.
  11.  */
  12. #ifndef _ASM_GENERIC_ATOMIC64_H
  13. #define _ASM_GENERIC_ATOMIC64_H
  14.  
  15. typedef struct {
  16.         long long counter;
  17. } atomic64_t;
  18.  
  19. #define ATOMIC64_INIT(i)        { (i) }
  20.  
  21. extern long long atomic64_read(const atomic64_t *v);
  22. extern void      atomic64_set(atomic64_t *v, long long i);
  23.  
  24. #define ATOMIC64_OP(op)                                                 \
  25. extern void      atomic64_##op(long long a, atomic64_t *v);
  26.  
  27. #define ATOMIC64_OP_RETURN(op)                                          \
  28. extern long long atomic64_##op##_return(long long a, atomic64_t *v);
  29.  
  30. #define ATOMIC64_OPS(op)        ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op)
  31.  
  32. ATOMIC64_OPS(add)
  33. ATOMIC64_OPS(sub)
  34.  
  35. ATOMIC64_OP(and)
  36. ATOMIC64_OP(or)
  37. ATOMIC64_OP(xor)
  38.  
  39. #undef ATOMIC64_OPS
  40. #undef ATOMIC64_OP_RETURN
  41. #undef ATOMIC64_OP
  42.  
  43. extern long long atomic64_dec_if_positive(atomic64_t *v);
  44. extern long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n);
  45. extern long long atomic64_xchg(atomic64_t *v, long long new);
  46. extern int       atomic64_add_unless(atomic64_t *v, long long a, long long u);
  47.  
  48. #define atomic64_add_negative(a, v)     (atomic64_add_return((a), (v)) < 0)
  49. #define atomic64_inc(v)                 atomic64_add(1LL, (v))
  50. #define atomic64_inc_return(v)          atomic64_add_return(1LL, (v))
  51. #define atomic64_inc_and_test(v)        (atomic64_inc_return(v) == 0)
  52. #define atomic64_sub_and_test(a, v)     (atomic64_sub_return((a), (v)) == 0)
  53. #define atomic64_dec(v)                 atomic64_sub(1LL, (v))
  54. #define atomic64_dec_return(v)          atomic64_sub_return(1LL, (v))
  55. #define atomic64_dec_and_test(v)        (atomic64_dec_return((v)) == 0)
  56. #define atomic64_inc_not_zero(v)        atomic64_add_unless((v), 1LL, 0LL)
  57.  
  58. #endif  /*  _ASM_GENERIC_ATOMIC64_H  */
  59.