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Diffstat (limited to 'include/asm-generic/atomic64.h')
| -rw-r--r-- | include/asm-generic/atomic64.h | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/include/asm-generic/atomic64.h b/include/asm-generic/atomic64.h new file mode 100644 index 000000000..370f01d44 --- /dev/null +++ b/include/asm-generic/atomic64.h @@ -0,0 +1,56 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Generic implementation of 64-bit atomics using spinlocks, + * useful on processors that don't have 64-bit atomic instructions. + * + * Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> + */ +#ifndef _ASM_GENERIC_ATOMIC64_H +#define _ASM_GENERIC_ATOMIC64_H +#include <linux/types.h> + +typedef struct { + s64 counter; +} atomic64_t; + +#define ATOMIC64_INIT(i) { (i) } + +extern s64 atomic64_read(const atomic64_t *v); +extern void atomic64_set(atomic64_t *v, s64 i); + +#define atomic64_set_release(v, i) atomic64_set((v), (i)) + +#define ATOMIC64_OP(op) \ +extern void atomic64_##op(s64 a, atomic64_t *v); + +#define ATOMIC64_OP_RETURN(op) \ +extern s64 atomic64_##op##_return(s64 a, atomic64_t *v); + +#define ATOMIC64_FETCH_OP(op) \ +extern s64 atomic64_fetch_##op(s64 a, atomic64_t *v); + +#define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op) + +ATOMIC64_OPS(add) +ATOMIC64_OPS(sub) + +#undef ATOMIC64_OPS +#define ATOMIC64_OPS(op) ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op) + +ATOMIC64_OPS(and) +ATOMIC64_OPS(or) +ATOMIC64_OPS(xor) + +#undef ATOMIC64_OPS +#undef ATOMIC64_FETCH_OP +#undef ATOMIC64_OP_RETURN +#undef ATOMIC64_OP + +extern s64 atomic64_dec_if_positive(atomic64_t *v); +#define atomic64_dec_if_positive atomic64_dec_if_positive +extern s64 atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n); +extern s64 atomic64_xchg(atomic64_t *v, s64 new); +extern s64 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u); +#define atomic64_fetch_add_unless atomic64_fetch_add_unless + +#endif /* _ASM_GENERIC_ATOMIC64_H */ |