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 atomic64_read(const atomic64_t *v); 19 extern void atomic64_set(atomic64_t *v, s64 i); 20 21 #define atomic64_set_release(v, i) atomic64_set((v), (i)) 22 23 #define ATOMIC64_OP(op) \ 24 extern void atomic64_##op(s64 a, atomic64_t *v); 25 26 #define ATOMIC64_OP_RETURN(op) \ 27 extern s64 atomic64_##op##_return(s64 a, atomic64_t *v); 28 29 #define ATOMIC64_FETCH_OP(op) \ 30 extern s64 atomic64_fetch_##op(s64 a, atomic64_t *v); 31 32 #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op) 33 34 ATOMIC64_OPS(add) 35 ATOMIC64_OPS(sub) 36 37 #undef ATOMIC64_OPS 38 #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op) 39 40 ATOMIC64_OPS(and) 41 ATOMIC64_OPS(or) 42 ATOMIC64_OPS(xor) 43 44 #undef ATOMIC64_OPS 45 #undef ATOMIC64_FETCH_OP 46 #undef ATOMIC64_OP_RETURN 47 #undef ATOMIC64_OP 48 49 extern s64 atomic64_dec_if_positive(atomic64_t *v); 50 #define atomic64_dec_if_positive atomic64_dec_if_positive 51 extern s64 atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n); 52 extern s64 atomic64_xchg(atomic64_t *v, s64 new); 53 extern s64 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u); 54 #define atomic64_fetch_add_unless atomic64_fetch_add_unless 55 56 #endif /* _ASM_GENERIC_ATOMIC64_H */ 57