include/asm-generic/atomic64.h

   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
  12 typedef struct {
  13         s64 counter;
  14 } atomic64_t;
  15
  16 #define ATOMIC64_INIT(i)        { (i) }
  17
  18 extern s64 generic_atomic64_read(const atomic64_t *v);
  19 extern void generic_atomic64_set(atomic64_t *v, s64 i);
  20
  21 #define ATOMIC64_OP(op)                                                 \
  22 extern void generic_atomic64_##op(s64 a, atomic64_t *v);
  23
  24 #define ATOMIC64_OP_RETURN(op)                                          \
  25 extern s64 generic_atomic64_##op##_return(s64 a, atomic64_t *v);
  26
  27 #define ATOMIC64_FETCH_OP(op)                                           \
  28 extern s64 generic_atomic64_fetch_##op(s64 a, atomic64_t *v);
  29
  30 #define ATOMIC64_OPS(op)        ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op)
  31
  32 ATOMIC64_OPS(add)
  33 ATOMIC64_OPS(sub)
  34
  35 #undef ATOMIC64_OPS
  36 #define ATOMIC64_OPS(op)        ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op)
  37
  38 ATOMIC64_OPS(and)
  39 ATOMIC64_OPS(or)
  40 ATOMIC64_OPS(xor)
  41
  42 #undef ATOMIC64_OPS
  43 #undef ATOMIC64_FETCH_OP
  44 #undef ATOMIC64_OP_RETURN
  45 #undef ATOMIC64_OP
  46
  47 extern s64 generic_atomic64_dec_if_positive(atomic64_t *v);
  48 extern s64 generic_atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n);
  49 extern s64 generic_atomic64_xchg(atomic64_t *v, s64 new);
  50 extern s64 generic_atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u);
  51
  52 #define arch_atomic64_read              generic_atomic64_read
  53 #define arch_atomic64_set               generic_atomic64_set
  54 #define arch_atomic64_set_release       generic_atomic64_set
  55
  56 #define arch_atomic64_add               generic_atomic64_add
  57 #define arch_atomic64_add_return        generic_atomic64_add_return
  58 #define arch_atomic64_fetch_add         generic_atomic64_fetch_add
  59 #define arch_atomic64_sub               generic_atomic64_sub
  60 #define arch_atomic64_sub_return        generic_atomic64_sub_return
  61 #define arch_atomic64_fetch_sub         generic_atomic64_fetch_sub
  62
  63 #define arch_atomic64_and               generic_atomic64_and
  64 #define arch_atomic64_fetch_and         generic_atomic64_fetch_and
  65 #define arch_atomic64_or                generic_atomic64_or
  66 #define arch_atomic64_fetch_or          generic_atomic64_fetch_or
  67 #define arch_atomic64_xor               generic_atomic64_xor
  68 #define arch_atomic64_fetch_xor         generic_atomic64_fetch_xor
  69
  70 #define arch_atomic64_dec_if_positive   generic_atomic64_dec_if_positive
  71 #define arch_atomic64_cmpxchg           generic_atomic64_cmpxchg
  72 #define arch_atomic64_xchg              generic_atomic64_xchg
  73 #define arch_atomic64_fetch_add_unless  generic_atomic64_fetch_add_unless
  74
  75 #endif  /*  _ASM_GENERIC_ATOMIC64_H  */