1 /* 2 * Generic implementation of 64-bit atomics using spinlocks, 3 * useful on processors that don't have 64-bit atomic instructions. 4 * 5 * Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 #ifndef _ASM_GENERIC_ATOMIC64_H 13 #define _ASM_GENERIC_ATOMIC64_H 14 #include <linux/types.h> 15 16 typedef struct { 17 long long counter; 18 } atomic64_t; 19 20 #define ATOMIC64_INIT(i) { (i) } 21 22 extern long long atomic64_read(const atomic64_t *v); 23 extern void atomic64_set(atomic64_t *v, long long i); 24 25 #define atomic64_set_release(v, i) atomic64_set((v), (i)) 26 27 #define ATOMIC64_OP(op) \ 28 extern void atomic64_##op(long long a, atomic64_t *v); 29 30 #define ATOMIC64_OP_RETURN(op) \ 31 extern long long atomic64_##op##_return(long long a, atomic64_t *v); 32 33 #define ATOMIC64_FETCH_OP(op) \ 34 extern long long atomic64_fetch_##op(long long a, atomic64_t *v); 35 36 #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op) 37 38 ATOMIC64_OPS(add) 39 ATOMIC64_OPS(sub) 40 41 #undef ATOMIC64_OPS 42 #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op) 43 44 ATOMIC64_OPS(and) 45 ATOMIC64_OPS(or) 46 ATOMIC64_OPS(xor) 47 48 #undef ATOMIC64_OPS 49 #undef ATOMIC64_FETCH_OP 50 #undef ATOMIC64_OP_RETURN 51 #undef ATOMIC64_OP 52 53 extern long long atomic64_dec_if_positive(atomic64_t *v); 54 #define atomic64_dec_if_positive atomic64_dec_if_positive 55 extern long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n); 56 extern long long atomic64_xchg(atomic64_t *v, long long new); 57 extern long long atomic64_fetch_add_unless(atomic64_t *v, long long a, long long u); 58 #define atomic64_fetch_add_unless atomic64_fetch_add_unless 59 60 #endif /* _ASM_GENERIC_ATOMIC64_H */ 61