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// SPDX-License-Identifier: GPL-2.0-only
/*
* based on linux/include/asm-arm/atomic.h
*
* Copyright (c) 1996 Russell King.
*/
#ifndef __ASM_GENERIC_ATOMIC_H
#define __ASM_GENERIC_ATOMIC_H
#ifdef CONFIG_SMP
#error SMP not supported
#endif
#define ATOMIC_INIT(i) { (i) }
#ifdef CONFIG_64BIT
typedef struct { s64 counter; } atomic64_t;
#define atomic64_read(v) ((v)->counter)
#define atomic64_set(v, i) (((v)->counter) = (i))
static inline void atomic64_add(s64 i, volatile atomic64_t *v)
{
v->counter += i;
}
static inline void atomic64_sub(s64 i, volatile atomic64_t *v)
{
v->counter -= i;
}
static inline void atomic64_inc(volatile atomic64_t *v)
{
v->counter += 1;
}
static inline void atomic64_dec(volatile atomic64_t *v)
{
v->counter -= 1;
}
static inline int atomic64_dec_and_test(volatile atomic64_t *v)
{
s64 val;
val = v->counter;
v->counter = val -= 1;
return val == 0;
}
static inline int atomic64_add_negative(s64 i, volatile atomic64_t *v)
{
s64 val;
val = v->counter;
v->counter = val += i;
return val < 0;
}
#else
typedef struct { volatile int counter; } atomic_t;
#define ATOMIC_INIT(i) { (i) }
#define atomic_read(v) ((v)->counter)
#define atomic_set(v,i) (((v)->counter) = (i))
static inline void atomic_add(int i, volatile atomic_t *v)
{
v->counter += i;
}
static inline void atomic_sub(int i, volatile atomic_t *v)
{
v->counter -= i;
}
static inline void atomic_inc(volatile atomic_t *v)
{
v->counter += 1;
}
static inline void atomic_dec(volatile atomic_t *v)
{
v->counter -= 1;
}
static inline int atomic_dec_and_test(volatile atomic_t *v)
{
int val;
val = v->counter;
v->counter = val -= 1;
return val == 0;
}
static inline int atomic_add_negative(int i, volatile atomic_t *v)
{
int val;
val = v->counter;
v->counter = val += i;
return val < 0;
}
static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
{
*addr &= ~mask;
}
#endif
/* Atomic operations are already serializing on ARM */
#define smp_mb__before_atomic_dec() barrier()
#define smp_mb__after_atomic_dec() barrier()
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
#endif
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