locks.h

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/* Locks -- Operations to protect critical sections
    Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.
    Written by Stephane Carrez (stcarrez@nerim.fr)  
    Modified by Paul Harvey (csirac@users.sourceforge.net)
    for use with the BeeOS project 2004/03.
    
    This file was 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; either version 2, or (at your option) any
    later version.
    
    In addition to the permissions in the GNU General Public License, the
    Free Software Foundation gives you unlimited permission to link the
    compiled version of this file with other programs, and to distribute
    those programs without any restriction coming from the use of this
    file.  (The General Public License restrictions do apply in other
    respects; for example, they cover modification of the file, and
    distribution when not linked into another program.)
    
    This file 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
    General Public License for more details.
    
    You should have received a copy of the GNU General Public License
    along with this program; see the file COPYING.  If not, write to
    the Free Software Foundation, 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.
 */

#ifndef _M68HC11_LOCKS_H
#define _M68HC11_LOCKS_H

  
static __inline__ unsigned short
lock (void)
{
  unsigned short mask;

  __asm__ __volatile__ ("tpa\n\tsei" : "=d"(mask));
  return mask;
}

static __inline__ void
unlock (void)
{
  __asm__ __volatile__ ("cli");
}

static __inline__ void
restore (unsigned short mask)
{
  __asm__ __volatile__ ("tap" : : "d"(mask));
}

static __inline__ void
interruption_point (void)
{
  __asm__ __volatile__ ("cli\n\t"
                        "nop\n\t"
                        "sei");  
}

#endif

---