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- /* SPDX-License-Identifier: GPL-2.0-or-later */
- /*
- * Generic implementation of 64-bit atomics using spinlocks,
- * useful on processors that don't have 64-bit atomic instructions.
- *
- * Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
- */
- #ifndef _ASM_GENERIC_ATOMIC64_H
- #define _ASM_GENERIC_ATOMIC64_H
- #include <linux/types.h>
- typedef struct {
- s64 counter;
- } atomic64_t;
- #define ATOMIC64_INIT(i) { (i) }
- extern s64 atomic64_read(const atomic64_t *v);
- extern void atomic64_set(atomic64_t *v, s64 i);
- #define atomic64_set_release(v, i) atomic64_set((v), (i))
- #define ATOMIC64_OP(op) \
- extern void atomic64_##op(s64 a, atomic64_t *v);
- #define ATOMIC64_OP_RETURN(op) \
- extern s64 atomic64_##op##_return(s64 a, atomic64_t *v);
- #define ATOMIC64_FETCH_OP(op) \
- extern s64 atomic64_fetch_##op(s64 a, atomic64_t *v);
- #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op)
- ATOMIC64_OPS(add)
- ATOMIC64_OPS(sub)
- #undef ATOMIC64_OPS
- #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op)
- ATOMIC64_OPS(and)
- ATOMIC64_OPS(or)
- ATOMIC64_OPS(xor)
- #undef ATOMIC64_OPS
- #undef ATOMIC64_FETCH_OP
- #undef ATOMIC64_OP_RETURN
- #undef ATOMIC64_OP
- extern s64 atomic64_dec_if_positive(atomic64_t *v);
- #define atomic64_dec_if_positive atomic64_dec_if_positive
- extern s64 atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n);
- extern s64 atomic64_xchg(atomic64_t *v, s64 new);
- extern s64 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u);
- #define atomic64_fetch_add_unless atomic64_fetch_add_unless
- #endif /* _ASM_GENERIC_ATOMIC64_H */
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