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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/include/asm-generic/atomic64.h
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/* SPDX-License-Identifier: GPL-2.0-or-later */

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/*

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 * Generic implementation of 64-bit atomics using spinlocks,

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 * useful on processors that don't have 64-bit atomic instructions.

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 *

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 * Copyright © 2009 Paul Mackerras, IBM Corp. <[email protected]>

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 */

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#ifndef _ASM_GENERIC_ATOMIC64_H

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#define _ASM_GENERIC_ATOMIC64_H

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#include <linux/types.h>

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typedef struct {

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	s64 counter;

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} atomic64_t;

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#define ATOMIC64_INIT(i)	{ (i) }

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extern s64 generic_atomic64_read(const atomic64_t *v);

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extern void generic_atomic64_set(atomic64_t *v, s64 i);

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#define ATOMIC64_OP(op)							\

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extern void generic_atomic64_##op(s64 a, atomic64_t *v);

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#define ATOMIC64_OP_RETURN(op)						\

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extern s64 generic_atomic64_##op##_return(s64 a, atomic64_t *v);

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#define ATOMIC64_FETCH_OP(op)						\

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extern s64 generic_atomic64_fetch_##op(s64 a, atomic64_t *v);

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#define ATOMIC64_OPS(op)	ATOMIC64_OP(op) ATOMIC64_OP_RETURN(op) ATOMIC64_FETCH_OP(op)

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ATOMIC64_OPS(add)

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ATOMIC64_OPS(sub)

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#undef ATOMIC64_OPS

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#define ATOMIC64_OPS(op)	ATOMIC64_OP(op) ATOMIC64_FETCH_OP(op)

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ATOMIC64_OPS(and)

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ATOMIC64_OPS(or)

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ATOMIC64_OPS(xor)

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#undef ATOMIC64_OPS

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#undef ATOMIC64_FETCH_OP

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#undef ATOMIC64_OP_RETURN

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#undef ATOMIC64_OP

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extern s64 generic_atomic64_dec_if_positive(atomic64_t *v);

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extern s64 generic_atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n);

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extern s64 generic_atomic64_xchg(atomic64_t *v, s64 new);

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extern s64 generic_atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u);

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#define arch_atomic64_read		generic_atomic64_read

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#define arch_atomic64_set		generic_atomic64_set

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#define arch_atomic64_set_release	generic_atomic64_set

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#define arch_atomic64_add		generic_atomic64_add

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#define arch_atomic64_add_return	generic_atomic64_add_return

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#define arch_atomic64_fetch_add		generic_atomic64_fetch_add

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#define arch_atomic64_sub		generic_atomic64_sub

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#define arch_atomic64_sub_return	generic_atomic64_sub_return

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#define arch_atomic64_fetch_sub		generic_atomic64_fetch_sub

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#define arch_atomic64_and		generic_atomic64_and

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#define arch_atomic64_fetch_and		generic_atomic64_fetch_and

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#define arch_atomic64_or		generic_atomic64_or

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#define arch_atomic64_fetch_or		generic_atomic64_fetch_or

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#define arch_atomic64_xor		generic_atomic64_xor

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#define arch_atomic64_fetch_xor		generic_atomic64_fetch_xor

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#define arch_atomic64_dec_if_positive	generic_atomic64_dec_if_positive

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#define arch_atomic64_cmpxchg		generic_atomic64_cmpxchg

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#define arch_atomic64_xchg		generic_atomic64_xchg

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#define arch_atomic64_fetch_add_unless	generic_atomic64_fetch_add_unless

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#endif  /*  _ASM_GENERIC_ATOMIC64_H  */

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