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caf50003
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(no author)
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/*
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* linux/include/asm-arm/atomic.h
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*
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* Copyright (C) 1996 Russell King.
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* Copyright (C) 2002 Deep Blue Solutions Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARM_ATOMIC_H
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#define __ASM_ARM_ATOMIC_H
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typedef struct { volatile int counter; } atomic_t;
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#define ATOMIC_INIT(i) { (i) }
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#define atomic_read(v) ((v)->counter)
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#include <asm/system.h>
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2fdc7663
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(no author)
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#include <asm/compiler.h>
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caf50003
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(no author)
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#define atomic_set(v,i) (((v)->counter) = (i))
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static inline int atomic_add_return(int i, atomic_t *v)
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{
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unsigned long flags;
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int val;
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local_irq_save(flags);
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val = v->counter;
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v->counter = val += i;
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local_irq_restore(flags);
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return val;
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}
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static inline int atomic_sub_return(int i, atomic_t *v)
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{
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unsigned long flags;
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int val;
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local_irq_save(flags);
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val = v->counter;
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v->counter = val -= i;
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local_irq_restore(flags);
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return val;
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}
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static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
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{
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int ret;
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unsigned long flags;
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local_irq_save(flags);
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ret = v->counter;
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if (likely(ret == old))
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v->counter = new;
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local_irq_restore(flags);
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return ret;
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}
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static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
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{
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unsigned long flags;
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local_irq_save(flags);
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*addr &= ~mask;
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local_irq_restore(flags);
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}
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#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
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static inline int atomic_add_unless(atomic_t *v, int a, int u)
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{
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int c, old;
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c = atomic_read(v);
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while (c != u && (old = atomic_cmpxchg((v), c, c + a)) != c)
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c = old;
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return c != u;
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}
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#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
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#define atomic_add(i, v) (void) atomic_add_return(i, v)
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#define atomic_inc(v) (void) atomic_add_return(1, v)
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#define atomic_sub(i, v) (void) atomic_sub_return(i, v)
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#define atomic_dec(v) (void) atomic_sub_return(1, v)
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#define atomic_inc_and_test(v) (atomic_add_return(1, v) == 0)
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#define atomic_dec_and_test(v) (atomic_sub_return(1, v) == 0)
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#define atomic_inc_return(v) (atomic_add_return(1, v))
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#define atomic_dec_return(v) (atomic_sub_return(1, v))
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#define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
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#define atomic_add_negative(i,v) (atomic_add_return(i, v) < 0)
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/* Atomic operations are already serializing on ARM */
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#define smp_mb__before_atomic_dec() barrier()
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#define smp_mb__after_atomic_dec() barrier()
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#define smp_mb__before_atomic_inc() barrier()
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#define smp_mb__after_atomic_inc() barrier()
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#endif
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