1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-or-later */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Generic implementation of 64-bit atomics using spinlocks, 4*4882a593Smuzhiyun * useful on processors that don't have 64-bit atomic instructions. 5*4882a593Smuzhiyun * 6*4882a593Smuzhiyun * Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> 7*4882a593Smuzhiyun */ 8*4882a593Smuzhiyun #ifndef _ASM_GENERIC_ATOMIC64_H 9*4882a593Smuzhiyun #define _ASM_GENERIC_ATOMIC64_H 10*4882a593Smuzhiyun #include <linux/types.h> 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun typedef struct { 13*4882a593Smuzhiyun s64 counter; 14*4882a593Smuzhiyun } atomic64_t; 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun #define ATOMIC64_INIT(i) { (i) } 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun extern s64 atomic64_read(const atomic64_t *v); 19*4882a593Smuzhiyun extern void atomic64_set(atomic64_t *v, s64 i); 20*4882a593Smuzhiyun 21*4882a593Smuzhiyun #define atomic64_set_release(v, i) atomic64_set((v), (i)) 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun #define ATOMIC64_OP(op) \ 24*4882a593Smuzhiyun extern void atomic64_##op(s64 a, atomic64_t *v); 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun #define ATOMIC64_OP_RETURN(op) \ 27*4882a593Smuzhiyun extern s64 atomic64_##op##_return(s64 a, atomic64_t *v); 28*4882a593Smuzhiyun 29*4882a593Smuzhiyun #define ATOMIC64_FETCH_OP(op) \ 30*4882a593Smuzhiyun extern s64 atomic64_fetch_##op(s64 a, atomic64_t *v); 31*4882a593Smuzhiyun 32*4882a593Smuzhiyun #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op) 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun ATOMIC64_OPS(add) 35*4882a593Smuzhiyun ATOMIC64_OPS(sub) 36*4882a593Smuzhiyun 37*4882a593Smuzhiyun #undef ATOMIC64_OPS 38*4882a593Smuzhiyun #define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op) 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun ATOMIC64_OPS(and) 41*4882a593Smuzhiyun ATOMIC64_OPS(or) 42*4882a593Smuzhiyun ATOMIC64_OPS(xor) 43*4882a593Smuzhiyun 44*4882a593Smuzhiyun #undef ATOMIC64_OPS 45*4882a593Smuzhiyun #undef ATOMIC64_FETCH_OP 46*4882a593Smuzhiyun #undef ATOMIC64_OP_RETURN 47*4882a593Smuzhiyun #undef ATOMIC64_OP 48*4882a593Smuzhiyun 49*4882a593Smuzhiyun extern s64 atomic64_dec_if_positive(atomic64_t *v); 50*4882a593Smuzhiyun #define atomic64_dec_if_positive atomic64_dec_if_positive 51*4882a593Smuzhiyun extern s64 atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n); 52*4882a593Smuzhiyun extern s64 atomic64_xchg(atomic64_t *v, s64 new); 53*4882a593Smuzhiyun extern s64 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u); 54*4882a593Smuzhiyun #define atomic64_fetch_add_unless atomic64_fetch_add_unless 55*4882a593Smuzhiyun 56*4882a593Smuzhiyun #endif /* _ASM_GENERIC_ATOMIC64_H */ 57