| Paul Mackerras | 09d4e0e | 2009-06-12 21:10:05 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Generic implementation of 64-bit atomics using spinlocks, |
| 3 | * useful on processors that don't have 64-bit atomic instructions. |
| 4 | * |
| 5 | * Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version |
| 10 | * 2 of the License, or (at your option) any later version. |
| 11 | */ |
| 12 | #ifndef _ASM_GENERIC_ATOMIC64_H |
| 13 | #define _ASM_GENERIC_ATOMIC64_H |
| 14 | |
| 15 | typedef struct { |
| 16 | long long counter; |
| 17 | } atomic64_t; |
| 18 | |
| 19 | #define ATOMIC64_INIT(i) { (i) } |
| 20 | |
| 21 | extern long long atomic64_read(const atomic64_t *v); |
| 22 | extern void atomic64_set(atomic64_t *v, long long i); |
| Peter Zijlstra | 560cb12 | 2014-04-23 16:12:30 +0200 | [diff] [blame] | 23 | |
| 24 | #define ATOMIC64_OP(op) \ |
| 25 | extern void atomic64_##op(long long a, atomic64_t *v); |
| 26 | |
| 27 | #define ATOMIC64_OP_RETURN(op) \ |
| 28 | extern long long atomic64_##op##_return(long long a, atomic64_t *v); |
| 29 | |
| Peter Zijlstra | 28aa2bd | 2016-04-18 00:54:38 +0200 | [diff] [blame] | 30 | #define ATOMIC64_FETCH_OP(op) \ |
| 31 | extern long long atomic64_fetch_##op(long long a, atomic64_t *v); |
| 32 | |
| 33 | #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op) |
| Peter Zijlstra | 560cb12 | 2014-04-23 16:12:30 +0200 | [diff] [blame] | 34 | |
| 35 | ATOMIC64_OPS(add) |
| 36 | ATOMIC64_OPS(sub) |
| 37 | |
| Peter Zijlstra | 28aa2bd | 2016-04-18 00:54:38 +0200 | [diff] [blame] | 38 | #undef ATOMIC64_OPS |
| 39 | #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op) |
| 40 | |
| 41 | ATOMIC64_OPS(and) |
| 42 | ATOMIC64_OPS(or) |
| 43 | ATOMIC64_OPS(xor) |
| Peter Zijlstra | e6942b7 | 2014-04-23 19:32:50 +0200 | [diff] [blame] | 44 | |
| Peter Zijlstra | 560cb12 | 2014-04-23 16:12:30 +0200 | [diff] [blame] | 45 | #undef ATOMIC64_OPS |
| Peter Zijlstra | 28aa2bd | 2016-04-18 00:54:38 +0200 | [diff] [blame] | 46 | #undef ATOMIC64_FETCH_OP |
| Peter Zijlstra | 560cb12 | 2014-04-23 16:12:30 +0200 | [diff] [blame] | 47 | #undef ATOMIC64_OP_RETURN |
| 48 | #undef ATOMIC64_OP |
| 49 | |
| Paul Mackerras | 09d4e0e | 2009-06-12 21:10:05 +0000 | [diff] [blame] | 50 | extern long long atomic64_dec_if_positive(atomic64_t *v); |
| 51 | extern long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n); |
| 52 | extern long long atomic64_xchg(atomic64_t *v, long long new); |
| 53 | extern int atomic64_add_unless(atomic64_t *v, long long a, long long u); |
| 54 | |
| 55 | #define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0) |
| 56 | #define atomic64_inc(v) atomic64_add(1LL, (v)) |
| 57 | #define atomic64_inc_return(v) atomic64_add_return(1LL, (v)) |
| 58 | #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) |
| 59 | #define atomic64_sub_and_test(a, v) (atomic64_sub_return((a), (v)) == 0) |
| 60 | #define atomic64_dec(v) atomic64_sub(1LL, (v)) |
| 61 | #define atomic64_dec_return(v) atomic64_sub_return(1LL, (v)) |
| 62 | #define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0) |
| 63 | #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1LL, 0LL) |
| 64 | |
| 65 | #endif /* _ASM_GENERIC_ATOMIC64_H */ |