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1 jermar 1 
/*
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 * Copyright (c) 2005 Ondrej Palkovsky
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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 mips32 
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 * @{
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 */
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/** @file
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 */
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#ifndef KERN_mips32_ATOMIC_H_
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#define KERN_mips32_ATOMIC_H_
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#define atomic_inc(x)  ((void) atomic_add(x, 1))
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#define atomic_dec(x)  ((void) atomic_add(x, -1))
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#define atomic_postinc(x)  (atomic_add(x, 1) - 1)
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#define atomic_postdec(x)  (atomic_add(x, -1) + 1)
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#define atomic_preinc(x)  atomic_add(x, 1)
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#define atomic_predec(x)  atomic_add(x, -1)
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/* Atomic addition of immediate value.
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 *
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 * @param val Memory location to which will be the immediate value added.
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 * @param i Signed immediate that will be added to *val.
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 *
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 * @return Value after addition.
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 */
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static inline long atomic_add(atomic_t *val, int i)
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{
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    long tmp, v;
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    asm volatile (
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        "1:\n"
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        "   ll %0, %1\n"
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        "   addu %0, %0, %3\n"  /* same as addi, but never traps on overflow */
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        "   move %2, %0\n"
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        "   sc %0, %1\n"
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        "   beq %0, %4, 1b\n"   /* if the atomic operation failed, try again */
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        "   nop\n"
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        : "=&r" (tmp), "+m" (val->count), "=&r" (v)
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        : "r" (i), "i" (0)
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    );
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    return v;
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}
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static inline uint32_t test_and_set(atomic_t *val) {
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    uint32_t tmp, v;
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    asm volatile (
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        "1:\n"
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        "   ll %2, %1\n"
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        "   bnez %2, 2f\n"
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        "   li %0, %3\n"
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        "   sc %0, %1\n"
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        "   beqz %0, 1b\n"
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        "2:\n"
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        : "=&r" (tmp), "+m" (val->count), "=&r" (v)
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        : "i" (1)
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    );
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    return v;
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}
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#endif
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/** @}
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 */