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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
* Copyright (C) 2006 Kyle McMartin <kyle@parisc-linux.org>
*/
#ifndef _ASM_PARISC_ATOMIC_H_
#define _ASM_PARISC_ATOMIC_H_
#include <linux/types.h>
#include <asm/cmpxchg.h>
#include <asm/barrier.h>
/*
* Atomic operations that C can't guarantee us. Useful for
* resource counting etc..
*
* And probably incredibly slow on parisc. OTOH, we don't
* have to write any serious assembly. prumpf
*/
#ifdef CONFIG_SMP
#include <asm/spinlock.h>
#include <asm/cache.h> /* we use L1_CACHE_BYTES */
/* Use an array of spinlocks for our atomic_ts.
* Hash function to index into a different SPINLOCK.
* Since "a" is usually an address, use one spinlock per cacheline.
*/
# define ATOMIC_HASH_SIZE 4
# define ATOMIC_HASH(a) (&(__atomic_hash[ (((unsigned long) (a))/L1_CACHE_BYTES) & (ATOMIC_HASH_SIZE-1) ]))
extern arch_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned;
/* Can't use raw_spin_lock_irq because of #include problems, so
* this is the substitute */
#define _atomic_spin_lock_irqsave(l,f) do { \
arch_spinlock_t *s = ATOMIC_HASH(l); \
local_irq_save(f); \
arch_spin_lock(s); \
} while(0)
#define _atomic_spin_unlock_irqrestore(l,f) do { \
arch_spinlock_t *s = ATOMIC_HASH(l); \
arch_spin_unlock(s); \
local_irq_restore(f); \
} while(0)
#else
# define _atomic_spin_lock_irqsave(l,f) do { local_irq_save(f); } while (0)
# define _atomic_spin_unlock_irqrestore(l,f) do { local_irq_restore(f); } while (0)
#endif
/*
* Note that we need not lock read accesses - aligned word writes/reads
* are atomic, so a reader never sees inconsistent values.
*/
static __inline__ void arch_atomic_set(atomic_t *v, int i)
{
unsigned long flags;
_atomic_spin_lock_irqsave(v, flags);
v->counter = i;
_atomic_spin_unlock_irqrestore(v, flags);
}
#define arch_atomic_set_release(v, i) arch_atomic_set((v), (i))
static __inline__ int arch_atomic_read(const atomic_t *v)
{
return READ_ONCE((v)->counter);
}
/* exported interface */
#define arch_atomic_cmpxchg(v, o, n) (arch_cmpxchg(&((v)->counter), (o), (n)))
#define arch_atomic_xchg(v, new) (arch_xchg(&((v)->counter), new))
#define ATOMIC_OP(op, c_op) \
static __inline__ void arch_atomic_##op(int i, atomic_t *v) \
{ \
unsigned long flags; \
\
_atomic_spin_lock_irqsave(v, flags); \
v->counter c_op i; \
_atomic_spin_unlock_irqrestore(v, flags); \
}
#define ATOMIC_OP_RETURN(op, c_op) \
static __inline__ int arch_atomic_##op##_return(int i, atomic_t *v) \
{ \
unsigned long flags; \
int ret; \
\
_atomic_spin_lock_irqsave(v, flags); \
ret = (v->counter c_op i); \
_atomic_spin_unlock_irqrestore(v, flags); \
\
return ret; \
}
#define ATOMIC_FETCH_OP(op, c_op) \
static __inline__ int arch_atomic_fetch_##op(int i, atomic_t *v) \
{ \
unsigned long flags; \
int ret; \
\
_atomic_spin_lock_irqsave(v, flags); \
ret = v->counter; \
v->counter c_op i; \
_atomic_spin_unlock_irqrestore(v, flags); \
\
return ret; \
}
#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, -=)
#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, ^=)
#undef ATOMIC_OPS
#undef ATOMIC_FETCH_OP
#undef ATOMIC_OP_RETURN
#undef ATOMIC_OP
#ifdef CONFIG_64BIT
#define ATOMIC64_INIT(i) { (i) }
#define ATOMIC64_OP(op, c_op) \
static __inline__ void arch_atomic64_##op(s64 i, atomic64_t *v) \
{ \
unsigned long flags; \
\
_atomic_spin_lock_irqsave(v, flags); \
v->counter c_op i; \
_atomic_spin_unlock_irqrestore(v, flags); \
}
#define ATOMIC64_OP_RETURN(op, c_op) \
static __inline__ s64 arch_atomic64_##op##_return(s64 i, atomic64_t *v) \
{ \
unsigned long flags; \
s64 ret; \
\
_atomic_spin_lock_irqsave(v, flags); \
ret = (v->counter c_op i); \
_atomic_spin_unlock_irqrestore(v, flags); \
\
return ret; \
}
#define ATOMIC64_FETCH_OP(op, c_op) \
static __inline__ s64 arch_atomic64_fetch_##op(s64 i, atomic64_t *v) \
{ \
unsigned long flags; \
s64 ret; \
\
_atomic_spin_lock_irqsave(v, flags); \
ret = v->counter; \
v->counter c_op i; \
_atomic_spin_unlock_irqrestore(v, flags); \
\
return ret; \
}
#define ATOMIC64_OPS(op, c_op) \
ATOMIC64_OP(op, c_op) \
ATOMIC64_OP_RETURN(op, c_op) \
ATOMIC64_FETCH_OP(op, c_op)
ATOMIC64_OPS(add, +=)
ATOMIC64_OPS(sub, -=)
#undef ATOMIC64_OPS
#define ATOMIC64_OPS(op, c_op) \
ATOMIC64_OP(op, c_op) \
ATOMIC64_FETCH_OP(op, c_op)
ATOMIC64_OPS(and, &=)
ATOMIC64_OPS(or, |=)
ATOMIC64_OPS(xor, ^=)
#undef ATOMIC64_OPS
#undef ATOMIC64_FETCH_OP
#undef ATOMIC64_OP_RETURN
#undef ATOMIC64_OP
static __inline__ void
arch_atomic64_set(atomic64_t *v, s64 i)
{
unsigned long flags;
_atomic_spin_lock_irqsave(v, flags);
v->counter = i;
_atomic_spin_unlock_irqrestore(v, flags);
}
#define arch_atomic64_set_release(v, i) arch_atomic64_set((v), (i))
static __inline__ s64
arch_atomic64_read(const atomic64_t *v)
{
return READ_ONCE((v)->counter);
}
/* exported interface */
#define arch_atomic64_cmpxchg(v, o, n) \
((__typeof__((v)->counter))arch_cmpxchg(&((v)->counter), (o), (n)))
#define arch_atomic64_xchg(v, new) (arch_xchg(&((v)->counter), new))
#endif /* !CONFIG_64BIT */
#endif /* _ASM_PARISC_ATOMIC_H_ */
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