| /* |
| * 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> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| #ifndef _ASM_GENERIC_ATOMIC64_H |
| #define _ASM_GENERIC_ATOMIC64_H |
| #include <linux/types.h> |
| |
| typedef struct { |
| long long counter; |
| } atomic64_t; |
| |
| #define ATOMIC64_INIT(i) { (i) } |
| |
| extern long long atomic64_read(const atomic64_t *v); |
| extern void atomic64_set(atomic64_t *v, long long i); |
| |
| #define atomic64_set_release(v, i) atomic64_set((v), (i)) |
| |
| #define ATOMIC64_OP(op) \ |
| extern void atomic64_##op(long long a, atomic64_t *v); |
| |
| #define ATOMIC64_OP_RETURN(op) \ |
| extern long long atomic64_##op##_return(long long a, atomic64_t *v); |
| |
| #define ATOMIC64_FETCH_OP(op) \ |
| extern long long atomic64_fetch_##op(long long 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 long long atomic64_dec_if_positive(atomic64_t *v); |
| #define atomic64_dec_if_positive atomic64_dec_if_positive |
| extern long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n); |
| extern long long atomic64_xchg(atomic64_t *v, long long new); |
| extern long long atomic64_fetch_add_unless(atomic64_t *v, long long a, long long u); |
| #define atomic64_fetch_add_unless atomic64_fetch_add_unless |
| |
| #endif /* _ASM_GENERIC_ATOMIC64_H */ |