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asm-generic
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atomic64.h

atomic64.h 2.5 KB
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  1. /* SPDX-License-Identifier: GPL-2.0-or-later */
    2. 

  2. /*
    3. 

  3.  * Generic implementation of 64-bit atomics using spinlocks,
    4. 

  4.  * useful on processors that don't have 64-bit atomic instructions.
    5. 

  5.  *
    6. 

  6.  * Copyright © 2009 Paul Mackerras, IBM Corp. <[email protected]>
    7. 

  7.  */
    8. 

  8. #ifndef _ASM_GENERIC_ATOMIC64_H
    9. 

  9. #define _ASM_GENERIC_ATOMIC64_H
    10. 

  10. #include <linux/types.h>
    11. 

  11. 

  12. typedef struct {
    13. 

  13. 	s64 counter;
    14. 

  14. } atomic64_t;
    15. 

  15. 

  16. #define ATOMIC64_INIT(i)	{ (i) }
    17. 

  17. 

  18. extern s64 generic_atomic64_read(const atomic64_t *v);
    19. 

  19. extern void generic_atomic64_set(atomic64_t *v, s64 i);
    20. 

  20. 

  21. #define ATOMIC64_OP(op)							\
    22. 

  22. extern void generic_atomic64_##op(s64 a, atomic64_t *v);
    23. 

  23. 

  24. #define ATOMIC64_OP_RETURN(op)						\
    25. 

  25. extern s64 generic_atomic64_##op##_return(s64 a, atomic64_t *v);
    26. 

  26. 

  27. #define ATOMIC64_FETCH_OP(op)						\
    28. 

  28. extern s64 generic_atomic64_fetch_##op(s64 a, atomic64_t *v);
    29. 

  29. 

  30. #define ATOMIC64_OPS(op)	ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op)
    31. 

  31. 

  32. ATOMIC64_OPS(add)
    33. 

  33. ATOMIC64_OPS(sub)
    34. 

  34. 

  35. #undef ATOMIC64_OPS
    36. 

  36. #define ATOMIC64_OPS(op)	ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op)
    37. 

  37. 

  38. ATOMIC64_OPS(and)
    39. 

  39. ATOMIC64_OPS(or)
    40. 

  40. ATOMIC64_OPS(xor)
    41. 

  41. 

  42. #undef ATOMIC64_OPS
    43. 

  43. #undef ATOMIC64_FETCH_OP
    44. 

  44. #undef ATOMIC64_OP_RETURN
    45. 

  45. #undef ATOMIC64_OP
    46. 

  46. 

  47. extern s64 generic_atomic64_dec_if_positive(atomic64_t *v);
    48. 

  48. extern s64 generic_atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n);
    49. 

  49. extern s64 generic_atomic64_xchg(atomic64_t *v, s64 new);
    50. 

  50. extern s64 generic_atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u);
    51. 

  51. 

  52. #define arch_atomic64_read		generic_atomic64_read
    53. 

  53. #define arch_atomic64_set		generic_atomic64_set
    54. 

  54. #define arch_atomic64_set_release	generic_atomic64_set
    55. 

  55. 

  56. #define arch_atomic64_add		generic_atomic64_add
    57. 

  57. #define arch_atomic64_add_return	generic_atomic64_add_return
    58. 

  58. #define arch_atomic64_fetch_add		generic_atomic64_fetch_add
    59. 

  59. #define arch_atomic64_sub		generic_atomic64_sub
    60. 

  60. #define arch_atomic64_sub_return	generic_atomic64_sub_return
    61. 

  61. #define arch_atomic64_fetch_sub		generic_atomic64_fetch_sub
    62. 

  62. 

  63. #define arch_atomic64_and		generic_atomic64_and
    64. 

  64. #define arch_atomic64_fetch_and		generic_atomic64_fetch_and
    65. 

  65. #define arch_atomic64_or		generic_atomic64_or
    66. 

  66. #define arch_atomic64_fetch_or		generic_atomic64_fetch_or
    67. 

  67. #define arch_atomic64_xor		generic_atomic64_xor
    68. 

  68. #define arch_atomic64_fetch_xor		generic_atomic64_fetch_xor
    69. 

  69. 

  70. #define arch_atomic64_dec_if_positive	generic_atomic64_dec_if_positive
    71. 

  71. #define arch_atomic64_cmpxchg		generic_atomic64_cmpxchg
    72. 

  72. #define arch_atomic64_xchg		generic_atomic64_xchg
    73. 

  73. #define arch_atomic64_fetch_add_unless	generic_atomic64_fetch_add_unless
    74. 

  74. 

  75. #endif  /*  _ASM_GENERIC_ATOMIC64_H  */
    76.