193 lines
4.6 KiB
C
193 lines
4.6 KiB
C
/*
|
|
* Generic C implementation of atomic counter operations. Usable on
|
|
* UP systems only. Do not include in machine independent code.
|
|
*
|
|
* Originally implemented for MN10300.
|
|
*
|
|
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
#ifndef __ASM_GENERIC_ATOMIC_H
|
|
#define __ASM_GENERIC_ATOMIC_H
|
|
|
|
#include <asm/cmpxchg.h>
|
|
|
|
#ifdef CONFIG_SMP
|
|
/* Force people to define core atomics */
|
|
# if !defined(atomic_add_return) || !defined(atomic_sub_return) || \
|
|
!defined(atomic_clear_mask) || !defined(atomic_set_mask)
|
|
# error "SMP requires a little arch-specific magic"
|
|
# endif
|
|
#endif
|
|
|
|
/*
|
|
* Atomic operations that C can't guarantee us. Useful for
|
|
* resource counting etc..
|
|
*/
|
|
|
|
#define ATOMIC_INIT(i) { (i) }
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
/**
|
|
* atomic_read - read atomic variable
|
|
* @v: pointer of type atomic_t
|
|
*
|
|
* Atomically reads the value of @v.
|
|
*/
|
|
#ifndef atomic_read
|
|
#define atomic_read(v) (*(volatile int *)&(v)->counter)
|
|
#endif
|
|
|
|
/**
|
|
* atomic_set - set atomic variable
|
|
* @v: pointer of type atomic_t
|
|
* @i: required value
|
|
*
|
|
* Atomically sets the value of @v to @i.
|
|
*/
|
|
#define atomic_set(v, i) (((v)->counter) = (i))
|
|
|
|
#include <linux/irqflags.h>
|
|
|
|
/**
|
|
* atomic_add_return - add integer to atomic variable
|
|
* @i: integer value to add
|
|
* @v: pointer of type atomic_t
|
|
*
|
|
* Atomically adds @i to @v and returns the result
|
|
*/
|
|
#ifndef atomic_add_return
|
|
static inline int atomic_add_return(int i, atomic_t *v)
|
|
{
|
|
unsigned long flags;
|
|
int temp;
|
|
|
|
raw_local_irq_save(flags); /* Don't trace it in an irqsoff handler */
|
|
temp = v->counter;
|
|
temp += i;
|
|
v->counter = temp;
|
|
raw_local_irq_restore(flags);
|
|
|
|
return temp;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* atomic_sub_return - subtract integer from atomic variable
|
|
* @i: integer value to subtract
|
|
* @v: pointer of type atomic_t
|
|
*
|
|
* Atomically subtracts @i from @v and returns the result
|
|
*/
|
|
#ifndef atomic_sub_return
|
|
static inline int atomic_sub_return(int i, atomic_t *v)
|
|
{
|
|
unsigned long flags;
|
|
int temp;
|
|
|
|
raw_local_irq_save(flags); /* Don't trace it in an irqsoff handler */
|
|
temp = v->counter;
|
|
temp -= i;
|
|
v->counter = temp;
|
|
raw_local_irq_restore(flags);
|
|
|
|
return temp;
|
|
}
|
|
#endif
|
|
|
|
static inline int atomic_add_negative(int i, atomic_t *v)
|
|
{
|
|
return atomic_add_return(i, v) < 0;
|
|
}
|
|
|
|
static inline void atomic_add(int i, atomic_t *v)
|
|
{
|
|
atomic_add_return(i, v);
|
|
}
|
|
|
|
static inline void atomic_sub(int i, atomic_t *v)
|
|
{
|
|
atomic_sub_return(i, v);
|
|
}
|
|
|
|
static inline void atomic_inc(atomic_t *v)
|
|
{
|
|
atomic_add_return(1, v);
|
|
}
|
|
|
|
static inline void atomic_dec(atomic_t *v)
|
|
{
|
|
atomic_sub_return(1, v);
|
|
}
|
|
|
|
#define atomic_dec_return(v) atomic_sub_return(1, (v))
|
|
#define atomic_inc_return(v) atomic_add_return(1, (v))
|
|
|
|
#define atomic_sub_and_test(i, v) (atomic_sub_return((i), (v)) == 0)
|
|
#define atomic_dec_and_test(v) (atomic_dec_return(v) == 0)
|
|
#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
|
|
|
|
#define atomic_xchg(ptr, v) (xchg(&(ptr)->counter, (v)))
|
|
#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), (old), (new)))
|
|
|
|
static inline int __atomic_add_unless(atomic_t *v, int a, int u)
|
|
{
|
|
int c, old;
|
|
c = atomic_read(v);
|
|
while (c != u && (old = atomic_cmpxchg(v, c, c + a)) != c)
|
|
c = old;
|
|
return c;
|
|
}
|
|
|
|
/**
|
|
* atomic_clear_mask - Atomically clear bits in atomic variable
|
|
* @mask: Mask of the bits to be cleared
|
|
* @v: pointer of type atomic_t
|
|
*
|
|
* Atomically clears the bits set in @mask from @v
|
|
*/
|
|
#ifndef atomic_clear_mask
|
|
static inline void atomic_clear_mask(unsigned long mask, atomic_t *v)
|
|
{
|
|
unsigned long flags;
|
|
|
|
mask = ~mask;
|
|
raw_local_irq_save(flags); /* Don't trace it in a irqsoff handler */
|
|
v->counter &= mask;
|
|
raw_local_irq_restore(flags);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* atomic_set_mask - Atomically set bits in atomic variable
|
|
* @mask: Mask of the bits to be set
|
|
* @v: pointer of type atomic_t
|
|
*
|
|
* Atomically sets the bits set in @mask in @v
|
|
*/
|
|
#ifndef atomic_set_mask
|
|
static inline void atomic_set_mask(unsigned int mask, atomic_t *v)
|
|
{
|
|
unsigned long flags;
|
|
|
|
raw_local_irq_save(flags); /* Don't trace it in a irqsoff handler */
|
|
v->counter |= mask;
|
|
raw_local_irq_restore(flags);
|
|
}
|
|
#endif
|
|
|
|
/* Assume that atomic operations are already serializing */
|
|
#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 /* __KERNEL__ */
|
|
#endif /* __ASM_GENERIC_ATOMIC_H */
|