atomic64.h 1.6 KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556
  1. /* SPDX-License-Identifier: GPL-2.0-or-later */
  2. /*
  3. * Generic implementation of 64-bit atomics using spinlocks,
  4. * useful on processors that don't have 64-bit atomic instructions.
  5. *
  6. * Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
  7. */
  8. #ifndef _ASM_GENERIC_ATOMIC64_H
  9. #define _ASM_GENERIC_ATOMIC64_H
  10. #include <linux/types.h>
  11. typedef struct {
  12. s64 counter;
  13. } atomic64_t;
  14. #define ATOMIC64_INIT(i) { (i) }
  15. extern s64 atomic64_read(const atomic64_t *v);
  16. extern void atomic64_set(atomic64_t *v, s64 i);
  17. #define atomic64_set_release(v, i) atomic64_set((v), (i))
  18. #define ATOMIC64_OP(op) \
  19. extern void atomic64_##op(s64 a, atomic64_t *v);
  20. #define ATOMIC64_OP_RETURN(op) \
  21. extern s64 atomic64_##op##_return(s64 a, atomic64_t *v);
  22. #define ATOMIC64_FETCH_OP(op) \
  23. extern s64 atomic64_fetch_##op(s64 a, atomic64_t *v);
  24. #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op)
  25. ATOMIC64_OPS(add)
  26. ATOMIC64_OPS(sub)
  27. #undef ATOMIC64_OPS
  28. #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op)
  29. ATOMIC64_OPS(and)
  30. ATOMIC64_OPS(or)
  31. ATOMIC64_OPS(xor)
  32. #undef ATOMIC64_OPS
  33. #undef ATOMIC64_FETCH_OP
  34. #undef ATOMIC64_OP_RETURN
  35. #undef ATOMIC64_OP
  36. extern s64 atomic64_dec_if_positive(atomic64_t *v);
  37. #define atomic64_dec_if_positive atomic64_dec_if_positive
  38. extern s64 atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n);
  39. extern s64 atomic64_xchg(atomic64_t *v, s64 new);
  40. extern s64 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u);
  41. #define atomic64_fetch_add_unless atomic64_fetch_add_unless
  42. #endif /* _ASM_GENERIC_ATOMIC64_H */