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112 jermar 1 
/*
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 * Copyright (c) 2005 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup ia64   
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 * @{
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 */
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/** @file
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 */
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#ifndef KERN_ia64_ATOMIC_H_
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#define KERN_ia64_ATOMIC_H_
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/** Atomic addition.
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 *
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 * @param val       Atomic value.
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 * @param imm       Value to add.
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 *
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 * @return      Value before addition.
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 */
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static inline long atomic_add(atomic_t *val, int imm)
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{
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    long v;
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    asm volatile ("fetchadd8.rel %0 = %1, %2\n" : "=r" (v),
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        "+m" (val->count) : "i" (imm));
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    return v;
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}
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static inline uint64_t test_and_set(atomic_t *val)
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{
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    uint64_t v;
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    asm volatile (
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        "movl %0 = 0x1;;\n"
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        "xchg8 %0 = %1, %0;;\n"
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        : "=r" (v), "+m" (val->count)
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    );
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    return v;
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}
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static inline void atomic_lock_arch(atomic_t *val)
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{
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    do {
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        while (val->count)
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            ;
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    } while (test_and_set(val));
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}
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static inline void atomic_inc(atomic_t *val)
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{
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    atomic_add(val, 1);
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}
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static inline void atomic_dec(atomic_t *val)
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{
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    atomic_add(val, -1);
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}
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static inline long atomic_preinc(atomic_t *val)
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{
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    return atomic_add(val, 1) + 1;
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}
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static inline long atomic_predec(atomic_t *val)
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{
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    return atomic_add(val, -1) - 1;
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}
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static inline long atomic_postinc(atomic_t *val)
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{
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    return atomic_add(val, 1);
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}
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static inline long atomic_postdec(atomic_t *val)
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{
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    return atomic_add(val, -1);
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}
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#endif
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/** @}
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 */