1*2874c5fdSThomas Gleixner /* SPDX-License-Identifier: GPL-2.0-or-later */ 209d4e0edSPaul Mackerras /* 309d4e0edSPaul Mackerras * Generic implementation of 64-bit atomics using spinlocks, 409d4e0edSPaul Mackerras * useful on processors that don't have 64-bit atomic instructions. 509d4e0edSPaul Mackerras * 609d4e0edSPaul Mackerras * Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> 709d4e0edSPaul Mackerras */ 809d4e0edSPaul Mackerras #ifndef _ASM_GENERIC_ATOMIC64_H 909d4e0edSPaul Mackerras #define _ASM_GENERIC_ATOMIC64_H 10ade5ef92SMark Rutland #include <linux/types.h> 1109d4e0edSPaul Mackerras 1209d4e0edSPaul Mackerras typedef struct { 1309d4e0edSPaul Mackerras long long counter; 1409d4e0edSPaul Mackerras } atomic64_t; 1509d4e0edSPaul Mackerras 1609d4e0edSPaul Mackerras #define ATOMIC64_INIT(i) { (i) } 1709d4e0edSPaul Mackerras 1809d4e0edSPaul Mackerras extern long long atomic64_read(const atomic64_t *v); 1909d4e0edSPaul Mackerras extern void atomic64_set(atomic64_t *v, long long i); 20560cb12aSPeter Zijlstra 219d664c0aSPeter Zijlstra #define atomic64_set_release(v, i) atomic64_set((v), (i)) 229d664c0aSPeter Zijlstra 23560cb12aSPeter Zijlstra #define ATOMIC64_OP(op) \ 24560cb12aSPeter Zijlstra extern void atomic64_##op(long long a, atomic64_t *v); 25560cb12aSPeter Zijlstra 26560cb12aSPeter Zijlstra #define ATOMIC64_OP_RETURN(op) \ 27560cb12aSPeter Zijlstra extern long long atomic64_##op##_return(long long a, atomic64_t *v); 28560cb12aSPeter Zijlstra 2928aa2bdaSPeter Zijlstra #define ATOMIC64_FETCH_OP(op) \ 3028aa2bdaSPeter Zijlstra extern long long atomic64_fetch_##op(long long a, atomic64_t *v); 3128aa2bdaSPeter Zijlstra 3228aa2bdaSPeter Zijlstra #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op) 33560cb12aSPeter Zijlstra 34560cb12aSPeter Zijlstra ATOMIC64_OPS(add) 35560cb12aSPeter Zijlstra ATOMIC64_OPS(sub) 36560cb12aSPeter Zijlstra 3728aa2bdaSPeter Zijlstra #undef ATOMIC64_OPS 3828aa2bdaSPeter Zijlstra #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op) 3928aa2bdaSPeter Zijlstra 4028aa2bdaSPeter Zijlstra ATOMIC64_OPS(and) 4128aa2bdaSPeter Zijlstra ATOMIC64_OPS(or) 4228aa2bdaSPeter Zijlstra ATOMIC64_OPS(xor) 43e6942b7dSPeter Zijlstra 44560cb12aSPeter Zijlstra #undef ATOMIC64_OPS 4528aa2bdaSPeter Zijlstra #undef ATOMIC64_FETCH_OP 46560cb12aSPeter Zijlstra #undef ATOMIC64_OP_RETURN 47560cb12aSPeter Zijlstra #undef ATOMIC64_OP 48560cb12aSPeter Zijlstra 4909d4e0edSPaul Mackerras extern long long atomic64_dec_if_positive(atomic64_t *v); 50b3a2a05fSMark Rutland #define atomic64_dec_if_positive atomic64_dec_if_positive 5109d4e0edSPaul Mackerras extern long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n); 5209d4e0edSPaul Mackerras extern long long atomic64_xchg(atomic64_t *v, long long new); 5300b808abSMark Rutland extern long long atomic64_fetch_add_unless(atomic64_t *v, long long a, long long u); 5400b808abSMark Rutland #define atomic64_fetch_add_unless atomic64_fetch_add_unless 5509d4e0edSPaul Mackerras 5609d4e0edSPaul Mackerras #endif /* _ASM_GENERIC_ATOMIC64_H */ 57