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1 jermar 1 
/*
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 * Copyright (C) 2001-2004 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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#ifndef __ia32_ATOMIC_H__
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#define __ia32_ATOMIC_H__
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#include <arch/types.h>
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#include <arch/barrier.h>
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#include <preemption.h>
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#include <typedefs.h>
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static inline void atomic_inc(atomic_t *val) {
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#ifdef CONFIG_SMP
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    __asm__ volatile ("lock incl %0\n" : "=m" (val->count));
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#else
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    __asm__ volatile ("incl %0\n" : "=m" (val->count));
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#endif /* CONFIG_SMP */
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}
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static inline void atomic_dec(atomic_t *val) {
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#ifdef CONFIG_SMP
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    __asm__ volatile ("lock decl %0\n" : "=m" (val->count));
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#else
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    __asm__ volatile ("decl %0\n" : "=m" (val->count));
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#endif /* CONFIG_SMP */
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}
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static inline long atomic_postinc(atomic_t *val)
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{
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    long r = 1;
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    __asm__ volatile (
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        "lock xaddl %1, %0\n"
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        : "=m" (val->count), "+r" (r)
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    );
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    return r;
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}
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static inline long atomic_postdec(atomic_t *val)
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{
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    long r = -1;
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    __asm__ volatile (
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        "lock xaddl %1, %0\n"
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        : "=m" (val->count), "+r"(r)
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    );
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    return r;
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}
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#define atomic_preinc(val) (atomic_postinc(val)+1)
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#define atomic_predec(val) (atomic_postdec(val)-1)
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static inline __u32 test_and_set(atomic_t *val) {
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    __u32 v;
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    __asm__ volatile (
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        "movl $1, %0\n"
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        "xchgl %0, %1\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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/** ia32 specific fast spinlock */
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static inline void atomic_lock_arch(atomic_t *val)
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{
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    __u32 tmp;
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    preemption_disable();
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    __asm__ volatile (
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        "0:;"
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#ifdef CONFIG_HT
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        "pause;" /* Pentium 4's HT love this instruction */
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#endif
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        "mov %0, %1;"
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        "testl %1, %1;"
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        "jnz 0b;"       /* Lightweight looping on locked spinlock */
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        "incl %1;"      /* now use the atomic operation */
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        "xchgl %0, %1;"
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        "testl %1, %1;"
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        "jnz 0b;"
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                : "=m"(val->count),"=r"(tmp)
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        );
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    /*
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     * Prevent critical section code from bleeding out this way up.
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     */
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    CS_ENTER_BARRIER();
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}
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#endif