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bus_machdep.h revision 1.2 
      1 /*	$NetBSD: bus_machdep.h,v 1.2 2007/10/26 11:07:32 he Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996, 1997, 1998, 2001 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 of the Numerical Aerospace Simulation Facility,
      9  * NASA Ames Research Center.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the NetBSD
     22  *	Foundation, Inc. and its contributors.
     23  * 4. Neither the name of The NetBSD Foundation nor the names of its
     24  *    contributors may be used to endorse or promote products derived
     25  *    from this software without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     37  * POSSIBILITY OF SUCH DAMAGE.
     38  */
     39 
     40 #ifndef _HPCMIPS_BUS_MACHDEP_H_
     41 #define _HPCMIPS_BUS_MACHDEP_H_
     42 
     43 #ifdef BUS_SPACE_DEBUG
     44 #include <sys/systm.h> /* for printf() prototype */
     45 /*
     46  * Macros for checking the aligned-ness of pointers passed to bus
     47  * space ops.  Strict alignment is required by the MIPS architecture,
     48  * and a trap will occur if unaligned access is performed.  These
     49  * may aid in the debugging of a broken device driver by displaying
     50  * useful information about the problem.
     51  */
     52 #define	__BUS_SPACE_ALIGNED_ADDRESS(p, t)				\
     53 	((((u_long)(p)) & (sizeof(t)-1)) == 0)
     54 
     55 #define	__BUS_SPACE_ADDRESS_SANITY(p, t, d)				\
     56 ({									\
     57 	if (__BUS_SPACE_ALIGNED_ADDRESS((p), t) == 0) {			\
     58 		printf("%s 0x%lx not aligned to %d bytes %s:%d\n",	\
     59 		    d, (u_long)(p), sizeof(t), __FILE__, __LINE__);	\
     60 	}								\
     61 	(void) 0;							\
     62 })
     63 
     64 #define BUS_SPACE_ALIGNED_POINTER(p, t) __BUS_SPACE_ALIGNED_ADDRESS(p, t)
     65 #else
     66 #define	__BUS_SPACE_ADDRESS_SANITY(p,t,d)	(void) 0
     67 #define BUS_SPACE_ALIGNED_POINTER(p, t) ALIGNED_POINTER(p, t)
     68 #endif /* BUS_SPACE_DEBUG */
     69 
     70 #endif /* _HPCMIPS_BUS_MACHDEP_H_ */
     71