The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/param.h

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    1 /*-
    2  * Copyright (c) 1990 The Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * William Jolitz.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by the University of
   19  *      California, Berkeley and its contributors.
   20  * 4. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      from: @(#)param.h       5.8 (Berkeley) 6/28/91
   37  * $FreeBSD: src/sys/i386/include/param.h,v 1.23.2.1 1999/09/05 08:11:56 peter Exp $
   38  */
   39 
   40 #ifndef _MACHINE_PARAM_H_
   41 #define _MACHINE_PARAM_H_
   42 
   43 /*
   44  * Machine dependent constants for Intel 386.
   45  */
   46 
   47 #define MACHINE         "i386"
   48 #define MID_MACHINE     MID_I386
   49 
   50 /*
   51  * Round p (pointer or byte index) up to a correctly-aligned value
   52  * for all data types (int, long, ...).   The result is unsigned int
   53  * and must be cast to any desired pointer type.
   54  */
   55 #define ALIGNBYTES      (sizeof(int) - 1)
   56 #define ALIGN(p)        (((unsigned)(p) + ALIGNBYTES) & ~ALIGNBYTES)
   57 
   58 #define PAGE_SHIFT      12              /* LOG2(PAGE_SIZE) */
   59 #define PAGE_SIZE       (1<<PAGE_SHIFT) /* bytes/page */
   60 #define PAGE_MASK       (PAGE_SIZE-1)
   61 #define NPTEPG          (PAGE_SIZE/(sizeof (pt_entry_t)))
   62 
   63 #define NPDEPG          (PAGE_SIZE/(sizeof (pd_entry_t)))
   64 #define PDRSHIFT        22              /* LOG2(NBPDR) */
   65 #define NBPDR           (1<<PDRSHIFT)   /* bytes/page dir */
   66 
   67 #define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
   68 #define DEV_BSIZE       (1<<DEV_BSHIFT)
   69 
   70 #define BLKDEV_IOSIZE   2048
   71 #define MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */
   72 
   73 #define UPAGES  2               /* pages of u-area */
   74 
   75 /*
   76  * Constants related to network buffer management.
   77  * MCLBYTES must be no larger than CLBYTES (the software page size), and,
   78  * on machines that exchange pages of input or output buffers with mbuf
   79  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
   80  * of the hardware page size.
   81  */
   82 #ifndef MSIZE
   83 #define MSIZE           128             /* size of an mbuf */
   84 #endif  /* MSIZE */
   85 
   86 #ifndef MCLSHIFT
   87 #define MCLSHIFT        11              /* convert bytes to m_buf clusters */
   88 #endif  /* MCLSHIFT */
   89 #define MCLBYTES        (1 << MCLSHIFT) /* size of an m_buf cluster */
   90 #define MCLOFSET        (MCLBYTES - 1)  /* offset within an m_buf cluster */
   91 
   92 /*
   93  * Some macros for units conversion
   94  */
   95 
   96 /* clicks to bytes */
   97 #define ctob(x) ((x)<<PAGE_SHIFT)
   98 
   99 /* bytes to clicks */
  100 #define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT)
  101 
  102 /*
  103  * btodb() is messy and perhaps slow because `bytes' may be an off_t.  We
  104  * want to shift an unsigned type to avoid sign extension and we don't
  105  * want to widen `bytes' unnecessarily.  Assume that the result fits in
  106  * a daddr_t.
  107  */
  108 #define btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
  109         (sizeof (bytes) > sizeof(long) \
  110          ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \
  111          : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))
  112 
  113 #define dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
  114         ((off_t)(db) << DEV_BSHIFT)
  115 
  116 /*
  117  * Mach derived conversion macros
  118  */
  119 #define trunc_page(x)           ((unsigned)(x) & ~PAGE_MASK)
  120 #define round_page(x)           ((((unsigned)(x)) + PAGE_MASK) & ~PAGE_MASK)
  121 
  122 #define atop(x)                 ((unsigned)(x) >> PAGE_SHIFT)
  123 #define ptoa(x)                 ((unsigned)(x) << PAGE_SHIFT)
  124 
  125 #define i386_btop(x)            ((unsigned)(x) >> PAGE_SHIFT)
  126 #define i386_ptob(x)            ((unsigned)(x) << PAGE_SHIFT)
  127 
  128 #endif /* !_MACHINE_PARAM_H_ */

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