oro_arch.h

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/***************************************************************************
 tag: Peter Soetens  Mon Jan 10 15:59:15 CET 2005  oro_atomic.h

 oro_atomic.h -  description
 -------------------
 begin                : Mon January 10 2005
 copyright            : (C) 2005 Peter Soetens
 email                : peter.soetens@mech.kuleuven.ac.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 "../../rtt-config.h"
#ifndef __ORO_ARCH_I386__
#define __ORO_ARCH_I386__

#ifndef CONFIG_FORCE_UP
#define ORO_LOCK "lock ; "
#else
#define ORO_LOCK ""
#endif

typedef struct
{
  volatile int counter;
} oro_atomic_t;

#define ORO_ATOMIC_SETUP        oro_atomic_set
#define ORO_ATOMIC_CLEANUP(v)

#define oro_atomic_read(v)              ((v)->counter)

#define oro_atomic_set(v,i)             (((v)->counter) = (i))

static __inline__ void oro_atomic_add(oro_atomic_t *v, int i)
{
  __asm__ __volatile__(
      ORO_LOCK "addl %1,%0"
      :"=m" (v->counter)
      :"ir" (i), "m" (v->counter));
}

static __inline__ void oro_atomic_sub(oro_atomic_t *v, int i)
{
  __asm__ __volatile__(
      ORO_LOCK "subl %1,%0"
      :"=m" (v->counter)
      :"ir" (i), "m" (v->counter));
}

static __inline__ void oro_atomic_inc(oro_atomic_t *v)
{
  __asm__ __volatile__(
      ORO_LOCK "incl %0"
      :"=m" (v->counter)
      :"m" (v->counter));
}

static __inline__ void oro_atomic_dec(oro_atomic_t *v)
{
  __asm__ __volatile__(
      ORO_LOCK "decl %0"
      :"=m" (v->counter)
      :"m" (v->counter));
}

static __inline__ int oro_atomic_dec_and_test(oro_atomic_t *v)
{
  unsigned char c;

  __asm__ __volatile__(
      ORO_LOCK "decl %0; sete %1"
      :"=m" (v->counter), "=qm" (c)
      :"m" (v->counter) : "memory");
  return c != 0;
}

static __inline__ int oro_atomic_inc_and_test(oro_atomic_t *v)
{
  unsigned char c;

  __asm__ __volatile__(
      ORO_LOCK "incl %0; sete %1"
      :"=m" (v->counter), "=qm" (c)
      :"m" (v->counter) : "memory");
  return c != 0;
}

#define smp_mb__before_oro_atomic_dec() barrier()
#define smp_mb__after_oro_atomic_dec()  barrier()
#define smp_mb__before_oro_atomic_inc() barrier()
#define smp_mb__after_oro_atomic_inc()  barrier()

#ifndef CONFIG_FORCE_UP
#define ORO_LOCK_PREFIX "lock ; "
#else
#define ORO_LOCK_PREFIX ""
#endif

struct oro__xchg_dummy
{
  unsigned long a[100];
};
#define oro__xg(x) ((struct oro__xchg_dummy *)(x))

static inline unsigned long __oro_cmpxchg(volatile void *ptr, unsigned long old, unsigned long _new, int size)
{
  unsigned long prev;
  switch (size)
  {
    case 1:
      __asm__ __volatile__(ORO_LOCK_PREFIX "cmpxchgb %b1,%2"
          : "=a"(prev)
          : "q"(_new), "m"(*oro__xg(ptr)), "0"(old)
          : "memory");
      return prev;
    case 2:
      __asm__ __volatile__(ORO_LOCK_PREFIX "cmpxchgw %w1,%2"
          : "=a"(prev)
          : "q"(_new), "m"(*oro__xg(ptr)), "0"(old)
          : "memory");
      return prev;
    case 4:
      __asm__ __volatile__(ORO_LOCK_PREFIX "cmpxchgl %1,%2"
          : "=a"(prev)
          : "q"(_new), "m"(*oro__xg(ptr)), "0"(old)
          : "memory");
      return prev;
  }
  return old;
}

#define oro_cmpxchg(ptr,o,n)\
    ((__typeof__(*(ptr)))__oro_cmpxchg((ptr),(unsigned long)(o),\
                    (unsigned long)(n),sizeof(*(ptr))))

#undef ORO_LOCK
#undef ORO_LOCK_PREFIX
#endif