sys/arch/mips/include/mutex.h

   1 /*      $NetBSD: mutex.h,v 1.5 2008/01/04 21:53:00 ad Exp $     */
   2
   3 /*-
   4  * Copyright (c) 2002, 2007 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Jason R. Thorpe and Andrew Doran.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #ifndef _MIPS_MUTEX_H_
  33 #define _MIPS_MUTEX_H_
  34
  35 #ifndef __MUTEX_PRIVATE
  36
  37 struct kmutex {
  38         uintptr_t       mtx_pad1;
  39         uint32_t        mtx_pad2[2];
  40 };
  41
  42 #else   /* __MUTEX_PRIVATE */
  43
  44 #ifdef __MUTEX_PRIVATE
  45 #include <machine/lock.h>
  46 #endif
  47
  48 struct kmutex {
  49         volatile uintptr_t      mtx_owner;
  50         ipl_cookie_t            mtx_ipl;
  51         __cpu_simple_lock_t     mtx_lock;
  52 };
  53
  54 #define __HAVE_SIMPLE_MUTEXES           1
  55 #define __HAVE_MUTEX_STUBS              1
  56 #define __HAVE_SPIN_MUTEX_STUBS         1
  57
  58 #define MUTEX_RECEIVE(mtx)              membar_enter()
  59 #define MUTEX_GIVE(mtx)                 membar_exit()
  60
  61 #define MUTEX_CAS(p, o, n)              \
  62     (_atomic_cas_ulong((volatile unsigned long *)(p), (o), (n)) == (o))
  63
  64 unsigned long   _atomic_cas_ulong(volatile unsigned long *,
  65     unsigned long, unsigned long);
  66
  67 #endif  /* __MUTEX_PRIVATE */
  68
  69 #endif /* _MIPS_MUTEX_H_ */
  70