atomic64.h (2549B)
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 12typedef struct { 13 s64 counter; 14} atomic64_t; 15 16#define ATOMIC64_INIT(i) { (i) } 17 18extern s64 generic_atomic64_read(const atomic64_t *v); 19extern void generic_atomic64_set(atomic64_t *v, s64 i); 20 21#define ATOMIC64_OP(op) \ 22extern void generic_atomic64_##op(s64 a, atomic64_t *v); 23 24#define ATOMIC64_OP_RETURN(op) \ 25extern s64 generic_atomic64_##op##_return(s64 a, atomic64_t *v); 26 27#define ATOMIC64_FETCH_OP(op) \ 28extern s64 generic_atomic64_fetch_##op(s64 a, atomic64_t *v); 29 30#define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op) 31 32ATOMIC64_OPS(add) 33ATOMIC64_OPS(sub) 34 35#undef ATOMIC64_OPS 36#define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op) 37 38ATOMIC64_OPS(and) 39ATOMIC64_OPS(or) 40ATOMIC64_OPS(xor) 41 42#undef ATOMIC64_OPS 43#undef ATOMIC64_FETCH_OP 44#undef ATOMIC64_OP_RETURN 45#undef ATOMIC64_OP 46 47extern s64 generic_atomic64_dec_if_positive(atomic64_t *v); 48extern s64 generic_atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n); 49extern s64 generic_atomic64_xchg(atomic64_t *v, s64 new); 50extern s64 generic_atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u); 51 52#define arch_atomic64_read generic_atomic64_read 53#define arch_atomic64_set generic_atomic64_set 54#define arch_atomic64_set_release generic_atomic64_set 55 56#define arch_atomic64_add generic_atomic64_add 57#define arch_atomic64_add_return generic_atomic64_add_return 58#define arch_atomic64_fetch_add generic_atomic64_fetch_add 59#define arch_atomic64_sub generic_atomic64_sub 60#define arch_atomic64_sub_return generic_atomic64_sub_return 61#define arch_atomic64_fetch_sub generic_atomic64_fetch_sub 62 63#define arch_atomic64_and generic_atomic64_and 64#define arch_atomic64_fetch_and generic_atomic64_fetch_and 65#define arch_atomic64_or generic_atomic64_or 66#define arch_atomic64_fetch_or generic_atomic64_fetch_or 67#define arch_atomic64_xor generic_atomic64_xor 68#define arch_atomic64_fetch_xor generic_atomic64_fetch_xor 69 70#define arch_atomic64_dec_if_positive generic_atomic64_dec_if_positive 71#define arch_atomic64_cmpxchg generic_atomic64_cmpxchg 72#define arch_atomic64_xchg generic_atomic64_xchg 73#define arch_atomic64_fetch_add_unless generic_atomic64_fetch_add_unless 74 75#endif /* _ASM_GENERIC_ATOMIC64_H */