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| 2 | |
| 3 | * Generic implementation of 64-bit atomics using spinlocks,
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| 4 | * useful on processors that don't have 64-bit atomic instructions.
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| 5 | *
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| 6 | * Copyright © 2009 Paul Mackerras, IBM Corp. <[email protected]>
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| 7 |
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| 8 | #ifndef _ASM_GENERIC_ATOMIC64_H
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| 9 | #define _ASM_GENERIC_ATOMIC64_H
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| 10 | #include <linux/types.h>
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| 11 |
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| 12 | typedef struct {
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| 13 | s64 __aligned(sizeof(s64)) counter;
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| 14 | } atomic64_t;
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| 15 |
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| 16 | #define ATOMIC64_INIT(i) { (i) }
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| 17 |
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| 18 | extern s64 generic_atomic64_read(const atomic64_t *v);
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| 19 | extern void generic_atomic64_set(atomic64_t *v, s64 i);
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| 20 |
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| 21 | #define ATOMIC64_OP(op) \
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| 22 | extern void generic_atomic64_##op(s64 a, atomic64_t *v);
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| 23 |
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| 24 | #define ATOMIC64_OP_RETURN(op) \
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| 25 | extern s64 generic_atomic64_##op##_return(s64 a, atomic64_t *v);
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| 26 |
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| 27 | #define ATOMIC64_FETCH_OP(op) \
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| 28 | extern s64 generic_atomic64_fetch_##op(s64 a, atomic64_t *v);
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| 29 |
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| 30 | #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op)
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| 31 |
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| 32 | ATOMIC64_OPS(add)
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| 33 | ATOMIC64_OPS(sub)
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| 34 |
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| 35 | #undef ATOMIC64_OPS
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| 36 | #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op)
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| 37 |
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| 38 | ATOMIC64_OPS(and)
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| 39 | ATOMIC64_OPS(or)
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| 40 | ATOMIC64_OPS(xor)
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| 41 |
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| 42 | #undef ATOMIC64_OPS
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| 43 | #undef ATOMIC64_FETCH_OP
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| 44 | #undef ATOMIC64_OP_RETURN
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| 45 | #undef ATOMIC64_OP
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| 46 |
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| 47 | extern s64 generic_atomic64_dec_if_positive(atomic64_t *v);
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| 48 | extern s64 generic_atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n);
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| 49 | extern s64 generic_atomic64_xchg(atomic64_t *v, s64 new);
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| 50 | extern s64 generic_atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u);
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| 51 |
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| 52 | #define arch_atomic64_read generic_atomic64_read
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| 53 | #define arch_atomic64_set generic_atomic64_set
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| 54 | #define arch_atomic64_set_release generic_atomic64_set
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| 55 |
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| 56 | #define arch_atomic64_add generic_atomic64_add
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| 57 | #define arch_atomic64_add_return generic_atomic64_add_return
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| 58 | #define arch_atomic64_fetch_add generic_atomic64_fetch_add
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| 59 | #define arch_atomic64_sub generic_atomic64_sub
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| 60 | #define arch_atomic64_sub_return generic_atomic64_sub_return
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| 61 | #define arch_atomic64_fetch_sub generic_atomic64_fetch_sub
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| 62 |
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| 63 | #define arch_atomic64_and generic_atomic64_and
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| 64 | #define arch_atomic64_fetch_and generic_atomic64_fetch_and
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| 65 | #define arch_atomic64_or generic_atomic64_or
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| 66 | #define arch_atomic64_fetch_or generic_atomic64_fetch_or
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| 67 | #define arch_atomic64_xor generic_atomic64_xor
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| 68 | #define arch_atomic64_fetch_xor generic_atomic64_fetch_xor
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| 69 |
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| 70 | #define arch_atomic64_dec_if_positive generic_atomic64_dec_if_positive
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| 71 | #define arch_atomic64_cmpxchg generic_atomic64_cmpxchg
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| 72 | #define arch_atomic64_xchg generic_atomic64_xchg
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| 73 | #define arch_atomic64_fetch_add_unless generic_atomic64_fetch_add_unless
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| 74 |
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| 75 | #endif
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