| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 */ |