124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
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/*
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_MICROBLAZE_ATOMIC_H
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#define _ASM_MICROBLAZE_ATOMIC_H
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#include <linux/types.h>
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#include <linux/compiler.h> /* likely */
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#include <asm/system.h> /* local_irq_XXX and friends */
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#define ATOMIC_INIT(i) { (i) }
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#define atomic_read(v) ((v)->counter)
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#define atomic_set(v, i) (((v)->counter) = (i))
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#define atomic_inc(v) (atomic_add_return(1, (v)))
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#define atomic_dec(v) (atomic_sub_return(1, (v)))
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#define atomic_add(i, v) (atomic_add_return(i, (v)))
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#define atomic_sub(i, v) (atomic_sub_return(i, (v)))
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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_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_not_zero(v) (atomic_add_unless((v), 1, 0))
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#define atomic_sub_and_test(i, v) (atomic_sub_return((i), (v)) == 0)
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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 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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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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/**
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* atomic_add_return - add and return
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* @i: integer value to add
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* @v: pointer of type atomic_t
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*
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* Atomically adds @i to @v and returns @i + @v
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*/
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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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return atomic_add_return(-i, v);
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}
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/*
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* Atomically test *v and decrement if it is greater than 0.
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* The function returns the old value of *v minus 1.
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*/
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static inline int atomic_dec_if_positive(atomic_t *v)
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{
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unsigned long flags;
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int res;
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local_irq_save(flags);
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res = v->counter - 1;
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if (res >= 0)
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v->counter = res;
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local_irq_restore(flags);
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return res;
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}
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#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
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#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
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/* Atomic operations are already serializing */
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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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#include <asm-generic/atomic.h>
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#endif /* _ASM_MICROBLAZE_ATOMIC_H */
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