/*********************************************************************
 *                
 * Copyright (C) 1999-2010,  Karlsruhe University
 * Copyright (C) 2008-2009,  Volkmar Uhlig, IBM Corporation
 *                
 * File path:     l4/powerpc/specials.h
 * Description:   
 *                
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *                
 * $Id$
 *                
 ********************************************************************/
#ifndef __L4__POWERPC__SPECIALS_H__
#define __L4__POWERPC__SPECIALS_H__

/*
 * Architecture specific helper functions.
 */
L4_INLINE void __L4_Inc_Atomic (L4_Word_t *w)
{
    L4_Word_t dummy;
    __asm__ __volatile__(
        "/* l4_inc_atomic()	*/\n"
        "sync\n"
        "1:	lwarx	%0,0,%1\n"
        "	addic	%0,%0,1\n"
        "	stwcx.	%0,0,%1 \n"
        "	bne-	1b"
        "isync\n"
        : "=&r" (dummy)
        : "r" (w)
        : "cc");
}


L4_INLINE int __L4_Msb( L4_Word_t w ) __attribute__ ((const));

L4_INLINE int __L4_Msb( L4_Word_t w )
{
    int zeros;

    __asm__ __volatile__ ("cntlzw %0, %1" : "=r" (zeros) : "r" (w) );

    return 31-zeros;
}

L4_INLINE int __L4_Lsb( L4_Word_t w )
{
    return __L4_Msb(w & -w);
}

#if defined(__cplusplus)
L4_INLINE L4_Fpage_t L4_Fpage (L4_Fpage_t f)
{
        L4_Fpage_t out;
	    out.raw = f.raw;
	        return out;
}
#endif

#endif	/* __L4__POWERPC__SPECIALS_H__ */