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      1 /*	$NetBSD: bus_machdep.h,v 1.3 2008/04/28 20:23:21 martin 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  *
     20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     30  * POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #ifndef _HPCMIPS_BUS_MACHDEP_H_
     34 #define _HPCMIPS_BUS_MACHDEP_H_
     35 
     36 #ifdef BUS_SPACE_DEBUG
     37 #include <sys/systm.h> /* for printf() prototype */
     38 /*
     39  * Macros for checking the aligned-ness of pointers passed to bus
     40  * space ops.  Strict alignment is required by the MIPS architecture,
     41  * and a trap will occur if unaligned access is performed.  These
     42  * may aid in the debugging of a broken device driver by displaying
     43  * useful information about the problem.
     44  */
     45 #define	__BUS_SPACE_ALIGNED_ADDRESS(p, t)				\
     46 	((((u_long)(p)) & (sizeof(t)-1)) == 0)
     47 
     48 #define	__BUS_SPACE_ADDRESS_SANITY(p, t, d)				\
     49 ({									\
     50 	if (__BUS_SPACE_ALIGNED_ADDRESS((p), t) == 0) {			\
     51 		printf("%s 0x%lx not aligned to %d bytes %s:%d\n",	\
     52 		    d, (u_long)(p), sizeof(t), __FILE__, __LINE__);	\
     53 	}								\
     54 	(void) 0;							\
     55 })
     56 
     57 #define BUS_SPACE_ALIGNED_POINTER(p, t) __BUS_SPACE_ALIGNED_ADDRESS(p, t)
     58 #else
     59 #define	__BUS_SPACE_ADDRESS_SANITY(p,t,d)	(void) 0
     60 #define BUS_SPACE_ALIGNED_POINTER(p, t) ALIGNED_POINTER(p, t)
     61 #endif /* BUS_SPACE_DEBUG */
     62 
     63 #endif /* _HPCMIPS_BUS_MACHDEP_H_ */
     64