Quelle  atomic-irq.h   Sprache: C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_SH_ATOMIC_IRQ_H
#define __ASM_SH_ATOMIC_IRQ_H

#include <linux/irqflags.h>

/*
 * To get proper branch prediction for the main line, we must branch
 * forward to code at the end of this object's .text section, then
 * branch back to restart the operation.
 */

#define ATOMIC_OP(op, c_op)      \
static inline void arch_atomic_##op(int i, atomic_t *v)   \
{         \
 unsigned long flags;      \
         \
 raw_local_irq_save(flags);     \
 v->counter c_op i;      \
 raw_local_irq_restore(flags);     \
}

#define ATOMIC_OP_RETURN(op, c_op)     \
static inline int arch_atomic_##op##_return(int i, atomic_t *v)  \
{         \
 unsigned long temp, flags;     \
         \
 raw_local_irq_save(flags);     \
 temp = v->counter;      \
 temp c_op i;       \
 v->counter = temp;      \
 raw_local_irq_restore(flags);     \
         \
 return temp;       \
}

#define ATOMIC_FETCH_OP(op, c_op)     \
static inline int arch_atomic_fetch_##op(int i, atomic_t *v)  \
{         \
 unsigned long temp, flags;     \
         \
 raw_local_irq_save(flags);     \
 temp = v->counter;      \
 v->counter c_op i;      \
 raw_local_irq_restore(flags);     \
         \
 return temp;       \
}

#define ATOMIC_OPS(op, c_op)      \
 ATOMIC_OP(op, c_op)      \
 ATOMIC_OP_RETURN(op, c_op)     \
 ATOMIC_FETCH_OP(op, c_op)

ATOMIC_OPS(add, +=)
ATOMIC_OPS(sub, -=)

#define arch_atomic_add_return arch_atomic_add_return
#define arch_atomic_sub_return arch_atomic_sub_return
#define arch_atomic_fetch_add arch_atomic_fetch_add
#define arch_atomic_fetch_sub arch_atomic_fetch_sub

#undef ATOMIC_OPS
#define ATOMIC_OPS(op, c_op)      \
 ATOMIC_OP(op, c_op)      \
 ATOMIC_FETCH_OP(op, c_op)

ATOMIC_OPS(and, &=)
ATOMIC_OPS(or, |=)
ATOMIC_OPS(xor, ^=)

#define arch_atomic_fetch_and arch_atomic_fetch_and
#define arch_atomic_fetch_or arch_atomic_fetch_or
#define arch_atomic_fetch_xor arch_atomic_fetch_xor

#undef ATOMIC_OPS
#undef ATOMIC_FETCH_OP
#undef ATOMIC_OP_RETURN
#undef ATOMIC_OP

#endif /* __ASM_SH_ATOMIC_IRQ_H */