projects / mirror_ubuntu-focal-kernel.git / blame
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| 2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 09d4e0ed PM |
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> | |
| 09d4e0ed PM |
7 | */ |
| 8 | #ifndef _ASM_GENERIC_ATOMIC64_H | |
| 9 | #define _ASM_GENERIC_ATOMIC64_H | |
| ade5ef92 | 10 | #include <linux/types.h> |
| 09d4e0ed PM |
11 | |
| 12 | typedef struct { | |
| 9255813d | 13 | s64 counter; |
| 09d4e0ed PM |
14 | } atomic64_t; |
| 15 | ||
| 16 | #define ATOMIC64_INIT(i) { (i) } | |
| 17 | ||
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18 | extern s64 atomic64_read(const atomic64_t *v); |
| 19 | extern void atomic64_set(atomic64_t *v, s64 i); | |
| 560cb12a | 20 | |
| 9d664c0a PZ |
21 | #define atomic64_set_release(v, i) atomic64_set((v), (i)) |
| 22 | ||
| 560cb12a | 23 | #define ATOMIC64_OP(op) \ |
| 9255813d | 24 | extern void atomic64_##op(s64 a, atomic64_t *v); |
| 560cb12a PZ |
25 | |
| 26 | #define ATOMIC64_OP_RETURN(op) \ | |
| 9255813d | 27 | extern s64 atomic64_##op##_return(s64 a, atomic64_t *v); |
| 560cb12a | 28 | |
| 28aa2bda | 29 | #define ATOMIC64_FETCH_OP(op) \ |
| 9255813d | 30 | extern s64 atomic64_fetch_##op(s64 a, atomic64_t *v); |
| 28aa2bda PZ |
31 | |
| 32 | #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op) | |
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33 | |
| 34 | ATOMIC64_OPS(add) | |
| 35 | ATOMIC64_OPS(sub) | |
| 36 | ||
| 28aa2bda PZ |
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) | |
| e6942b7d | 43 | |
| 560cb12a | 44 | #undef ATOMIC64_OPS |
| 28aa2bda | 45 | #undef ATOMIC64_FETCH_OP |
| 560cb12a PZ |
46 | #undef ATOMIC64_OP_RETURN |
| 47 | #undef ATOMIC64_OP | |
| 48 | ||
| 9255813d | 49 | extern s64 atomic64_dec_if_positive(atomic64_t *v); |
| b3a2a05f | 50 | #define atomic64_dec_if_positive atomic64_dec_if_positive |
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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); | |
| 00b808ab | 54 | #define atomic64_fetch_add_unless atomic64_fetch_add_unless |
| 09d4e0ed | 55 | |
| 09d4e0ed | 56 | #endif /* _ASM_GENERIC_ATOMIC64_H */ |