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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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1702 cejka 29 
 /** @addtogroup ia32
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 * @{
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 */
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/** @file
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 */
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11 jermar 35 
#ifndef __ia32_ATOMIC_H__
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#define __ia32_ATOMIC_H__
1 jermar 37 
 
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#include <arch/types.h>
1100 palkovsky 39 
#include <arch/barrier.h>
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#include <preemption.h>
1104 jermar 41 
#include <typedefs.h>
1 jermar 42 
 
475 jermar 43 
static inline void atomic_inc(atomic_t *val) {
458 decky 44 
#ifdef CONFIG_SMP
625 palkovsky 45 
	__asm__ volatile ("lock incl %0\n" : "=m" (val->count));
115 jermar 46 
#else
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	__asm__ volatile ("incl %0\n" : "=m" (val->count));
458 decky 48 
#endif /* CONFIG_SMP */
115 jermar 49 
}
1 jermar 50 
 
475 jermar 51 
static inline void atomic_dec(atomic_t *val) {
458 decky 52 
#ifdef CONFIG_SMP
625 palkovsky 53 
	__asm__ volatile ("lock decl %0\n" : "=m" (val->count));
115 jermar 54 
#else
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	__asm__ volatile ("decl %0\n" : "=m" (val->count));
458 decky 56 
#endif /* CONFIG_SMP */
115 jermar 57 
}
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1104 jermar 59 
static inline long atomic_postinc(atomic_t *val)
477 vana 60 
{
1691 palkovsky 61 
	long r = 1;
627 jermar 62 
 
477 vana 63 
	__asm__ volatile (
1691 palkovsky 64 
		"lock xaddl %1, %0\n"
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		: "=m" (val->count), "+r" (r)
477 vana 66 
	);
627 jermar 67 
 
477 vana 68 
	return r;
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}
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1104 jermar 71 
static inline long atomic_postdec(atomic_t *val)
477 vana 72 
{
1691 palkovsky 73 
	long r = -1;
627 jermar 74 
 
477 vana 75 
	__asm__ volatile (
1691 palkovsky 76 
		"lock xaddl %1, %0\n"
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		: "=m" (val->count), "+r"(r)
477 vana 78 
	);
627 jermar 79 
 
477 vana 80 
	return r;
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}
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1024 jermar 83 
#define atomic_preinc(val) (atomic_postinc(val)+1)
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#define atomic_predec(val) (atomic_postdec(val)-1)
477 vana 85 
 
1780 jermar 86 
static inline uint32_t test_and_set(atomic_t *val) {
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	uint32_t v;
115 jermar 88 
 
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	__asm__ volatile (
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		"movl $1, %0\n"
259 palkovsky 91 
		"xchgl %0, %1\n"
625 palkovsky 92 
		: "=r" (v),"=m" (val->count)
115 jermar 93 
	);
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	return v;
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}
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1104 jermar 98 
/** ia32 specific fast spinlock */
1100 palkovsky 99 
static inline void atomic_lock_arch(atomic_t *val)
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{
1780 jermar 101 
	uint32_t tmp;
115 jermar 102 
 
1100 palkovsky 103 
	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;"
1104 jermar 111 
		"jnz 0b;"       /* Lightweight looping on locked spinlock */
1100 palkovsky 112 
 
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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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}
1 jermar 124 
 
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#endif
1702 cejka 126 
 
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 /** @}
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 */
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