oro_system.h

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/***************************************************************************
  tag: FMTC  Tue Mar 11 21:49:19 CET 2008  oro_system.h

                        oro_system.h -  description
                           -------------------
    begin                : Tue March 11 2008
    copyright            : (C) 2008 FMTC
    email                : peter.soetens@fmtc.be

 ***************************************************************************
 *   This library is free software; you can redistribute it and/or         *
 *   modify it under the terms of the GNU General Public                   *
 *   License as published by the Free Software Foundation;                 *
 *   version 2 of the License.                                             *
 *                                                                         *
 *   As a special exception, you may use this file as part of a free       *
 *   software library without restriction.  Specifically, if other files   *
 *   instantiate templates or use macros or inline functions from this     *
 *   file, or you compile this file and link it with other files to        *
 *   produce an executable, this file does not by itself cause the         *
 *   resulting executable to be covered by the GNU General Public          *
 *   License.  This exception does not however invalidate any other        *
 *   reasons why the executable file might be covered by the GNU General   *
 *   Public License.                                                       *
 *                                                                         *
 *   This library is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
 *   Lesser General Public License for more details.                       *
 *                                                                         *
 *   You should have received a copy of the GNU General Public             *
 *   License along with this library; if not, write to the Free Software   *
 *   Foundation, Inc., 59 Temple Place,                                    *
 *   Suite 330, Boston, MA  02111-1307  USA                                *
 *                                                                         *
 ***************************************************************************/


#include "oro_atomic.h"

#ifdef _cplusplus
extern "C"
{
#endif // _cplusplus

#define __HAVE_ARCH_CMPXCHG     1

static __inline__ unsigned long
__cmpxchg_u32(volatile unsigned int *p, unsigned long old, unsigned long newp)
{
        unsigned int prev;

        __asm__ __volatile__ (
        LWSYNC_ON_SMP
"1:     lwarx   %0,0,%2         # __cmpxchg_u32\n\
        cmpw    0,%0,%3\n\
        bne-    2f\n"
        PPC405_ERR77(0,%2)
"       stwcx.  %4,0,%2\n\
        bne-    1b"
        ISYNC_ON_SMP
        "\n\
2:"
        : "=&r" (prev), "=m" (*p)
        : "r" (p), "r" (old), "r" (newp), "m" (*p)
        : "cc", "memory");

        return prev;
}

  // KG did explicit cast to remove following error
  /*
  /kgad/orocos-port-branch/ports/ecos/arch/powerpc/boa5200/orecos-library/install/include/os/oro_powerpc/oro_system.h:
  In function `long unsigned int __oro_cmpxchg(volatile void*, long
  unsigned int, long unsigned int, unsigned int)':
  /kgad/orocos-port-branch/ports/ecos/arch/powerpc/boa5200/orecos-library/install/include/os/oro_powerpc/oro_system.h:52:
  error: invalid conversion from `volatile void*' to `volatile
  unsigned int*'
  /kgad/orocos-port-branch/ports/ecos/arch/powerpc/boa5200/orecos-library/install/include/os/oro_powerpc/oro_system.h:52:
  error:   initializing argument 1 of `long unsigned int
  __cmpxchg_u32(volatile unsigned int*, long unsigned int, long
  unsigned int)' */

static __inline__ unsigned long
__oro_cmpxchg(volatile void *ptr, unsigned long old, unsigned long newp, unsigned int size)
{
        switch (size) {
        case 4:
                return __cmpxchg_u32((volatile unsigned int *) ptr, old, newp);
        }
        return old;
}

#define oro_cmpxchg(ptr,o,n)                                             \
  ({                                                                     \
     __typeof__(*(ptr)) _o_ = (o);                                       \
     __typeof__(*(ptr)) _n_ = (n);                                       \
     (__typeof__(*(ptr))) __oro_cmpxchg((ptr), (unsigned long)_o_,               \
                                    (unsigned long)_n_, sizeof(*(ptr))); \
  })

#ifdef _cplusplus
} // end extern "C"
#endif // _cplusplus