FreeBSD/Linux Kernel Cross Reference
sys/osfmk/ppc/machparam.h

     /*
      * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
     * Version 2.0 (the 'License'). You may not use this file except in
     * compliance with the License. Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this
     * file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_LICENSE_HEADER_END@
     */
    /*
     * @OSF_COPYRIGHT@
     */
    /* 
     * Copyright (c) 1990, 1991 The University of Utah and
     * the Center for Software Science at the University of Utah (CSS).
     * All rights reserved.
     *
     * Permission to use, copy, modify and distribute this software is hereby
     * granted provided that (1) source code retains these copyright, permission,
     * and disclaimer notices, and (2) redistributions including binaries
     * reproduce the notices in supporting documentation, and (3) all advertising
     * materials mentioning features or use of this software display the following
     * acknowledgement: ``This product includes software developed by the Center
     * for Software Science at the University of Utah.''
     *
     * THE UNIVERSITY OF UTAH AND CSS ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
     * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSS DISCLAIM ANY LIABILITY OF
     * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     *
     * CSS requests users of this software to return to css-dist@cs.utah.edu any
     * improvements that they make and grant CSS redistribution rights.
     *
     *      Utah $Hdr: machparam.h 1.7 92/05/22$
     */
    
    #ifndef _PPC_MACHPARAM_H_
    #define _PPC_MACHPARAM_H_
    
    /*
     * Machine dependent constants for ppc. 
     * Added as needed (for device drivers).
     */
    #define NBPG    4096            /* bytes/page */
    #define PGSHIFT 12              /* LOG2(NBPG) */
    
    #define DEV_BSHIFT      10               /* log2(DEV_BSIZE) */
    
    /*
     * Disk devices do all IO in 1024-byte blocks.
     */
    #define DEV_BSIZE       1024
    
    #define btop(x) ((x)>>PGSHIFT)
    #define ptob(x) ((x)<<PGSHIFT)
    
    /* Clicks to disk blocks */
    #define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
    
    /* Disk blocks to clicks */
    #define       dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
    
    /* clicks to bytes */
    #define       ctob(x) ((x)<<PGSHIFT)
    
    /* bytes to clicks */
    #define       btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT)
    
    #endif /* _PPC_MACHPARAM_H_ */

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