arch/arm64/include/asm/atomic.h

Source file repositories/reference/linux-study-clean/arch/arm64/include/asm/atomic.h

File Facts

System
Linux kernel
Corpus path
arch/arm64/include/asm/atomic.h
Extension
.h
Size
7404 bytes
Lines
199
Domain
Architecture Layer
Bucket
arch/arm64
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef __ASM_ATOMIC_H
#define __ASM_ATOMIC_H

#include <linux/compiler.h>
#include <linux/types.h>

#include <asm/barrier.h>
#include <asm/cmpxchg.h>
#include <asm/lse.h>

#define ATOMIC_OP(op)							\
static __always_inline void arch_##op(int i, atomic_t *v)		\
{									\
	__lse_ll_sc_body(op, i, v);					\
}

ATOMIC_OP(atomic_andnot)
ATOMIC_OP(atomic_or)
ATOMIC_OP(atomic_xor)
ATOMIC_OP(atomic_add)
ATOMIC_OP(atomic_and)
ATOMIC_OP(atomic_sub)

#undef ATOMIC_OP

#define ATOMIC_FETCH_OP(name, op)					\
static __always_inline int arch_##op##name(int i, atomic_t *v)		\
{									\
	return __lse_ll_sc_body(op##name, i, v);			\
}

#define ATOMIC_FETCH_OPS(op)						\
	ATOMIC_FETCH_OP(_relaxed, op)					\
	ATOMIC_FETCH_OP(_acquire, op)					\
	ATOMIC_FETCH_OP(_release, op)					\
	ATOMIC_FETCH_OP(        , op)

ATOMIC_FETCH_OPS(atomic_fetch_andnot)
ATOMIC_FETCH_OPS(atomic_fetch_or)
ATOMIC_FETCH_OPS(atomic_fetch_xor)
ATOMIC_FETCH_OPS(atomic_fetch_add)
ATOMIC_FETCH_OPS(atomic_fetch_and)
ATOMIC_FETCH_OPS(atomic_fetch_sub)
ATOMIC_FETCH_OPS(atomic_add_return)
ATOMIC_FETCH_OPS(atomic_sub_return)

#undef ATOMIC_FETCH_OP
#undef ATOMIC_FETCH_OPS

#define ATOMIC64_OP(op)							\
static __always_inline void arch_##op(long i, atomic64_t *v)		\
{									\
	__lse_ll_sc_body(op, i, v);					\
}

ATOMIC64_OP(atomic64_andnot)
ATOMIC64_OP(atomic64_or)
ATOMIC64_OP(atomic64_xor)
ATOMIC64_OP(atomic64_add)
ATOMIC64_OP(atomic64_and)
ATOMIC64_OP(atomic64_sub)

#undef ATOMIC64_OP

#define ATOMIC64_FETCH_OP(name, op)					\
static __always_inline long arch_##op##name(long i, atomic64_t *v)	\
{									\
	return __lse_ll_sc_body(op##name, i, v);			\
}

#define ATOMIC64_FETCH_OPS(op)						\
	ATOMIC64_FETCH_OP(_relaxed, op)					\
	ATOMIC64_FETCH_OP(_acquire, op)					\
	ATOMIC64_FETCH_OP(_release, op)					\
	ATOMIC64_FETCH_OP(        , op)

ATOMIC64_FETCH_OPS(atomic64_fetch_andnot)
ATOMIC64_FETCH_OPS(atomic64_fetch_or)
ATOMIC64_FETCH_OPS(atomic64_fetch_xor)
ATOMIC64_FETCH_OPS(atomic64_fetch_add)
ATOMIC64_FETCH_OPS(atomic64_fetch_and)
ATOMIC64_FETCH_OPS(atomic64_fetch_sub)
ATOMIC64_FETCH_OPS(atomic64_add_return)
ATOMIC64_FETCH_OPS(atomic64_sub_return)

#undef ATOMIC64_FETCH_OP
#undef ATOMIC64_FETCH_OPS

static __always_inline long arch_atomic64_dec_if_positive(atomic64_t *v)
{

Annotation

Implementation Notes