spinlock.h

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/*
 *                               POK header
 * 
 * The following file is a part of the POK project. Any modification should
 * made according to the POK licence. You CANNOT use this file or a part of
 * this file is this part of a file for your own project
 *
 * For more information on the POK licence, please see our LICENCE FILE
 *
 * Please follow the coding guidelines described in doc/CODING_GUIDELINES
 *
 *                                      Copyright (c) 2007-2009 POK team 
 *
 * Created by julien on Thu Jan 15 23:34:13 2009 
 */


#ifndef __POK_SPINLOCK_H__
#define __POK_SPINLOCK_H__

typedef unsigned int pok_spinlock_t;

#define SPIN_UNLOCK(_spin_)                                     \
  (_spin_) = 0

#define SPIN_LOCK(_spin_)                                       \
  do {                                                          \
    unsigned int val;                                           \
    asm volatile ("\n"                                          \
                  "1:\n\t"                                      \
                  "lwarx    %0,0,%1       \n\t"                 \
                  "cmpwi    %0,0          \n\t"                 \
                  "bne      1b            \n\t"                 \
                  "stwcx.   %2,0,%1       \n\t"                 \
                  "bne      1b            \n\t"                 \
                  : "=&r"(val) : "r" (&_spin_), "r"(1));         \
  } while (0)

#endif /* !__POK_SPINLOCK_H__ */