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 generic_atomic64_read(const atomic64_t *v); 19 extern void generic_atomic64_set(atomic64_t *v, s64 i); 20 21 #define ATOMIC64_OP(op) \ 22 extern void generic_atomic64_##op(s64 a, atomic64_t *v); 23 24 #define ATOMIC64_OP_RETURN(op) \ 25 extern s64 generic_atomic64_##op##_return(s64 a, atomic64_t *v); 26 27 #define ATOMIC64_FETCH_OP(op) \ 28 extern 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 32 ATOMIC64_OPS(add) 33 ATOMIC64_OPS(sub) 34 35 #undef ATOMIC64_OPS 36 #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op) 37 38 ATOMIC64_OPS(and) 39 ATOMIC64_OPS(or) 40 ATOMIC64_OPS(xor) 41 42 #undef ATOMIC64_OPS 43 #undef ATOMIC64_FETCH_OP 44 #undef ATOMIC64_OP_RETURN 45 #undef ATOMIC64_OP 46 47 extern s64 generic_atomic64_dec_if_positive(atomic64_t *v); 48 extern s64 generic_atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n); 49 extern s64 generic_atomic64_xchg(atomic64_t *v, s64 new); 50 extern 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 */ 76