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  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      from: @(#)param.h       5.8 (Berkeley) 6/28/91
   33  * $FreeBSD: releng/6.2/sys/i386/include/param.h 137914 2004-11-20 02:29:50Z das $
   34  */
   35 
   36 /*
   37  * Machine dependent constants for Intel 386.
   38  */
   39 
   40 /*
   41  * Round p (pointer or byte index) up to a correctly-aligned value
   42  * for all data types (int, long, ...).   The result is unsigned int
   43  * and must be cast to any desired pointer type.
   44  */
   45 #ifndef _ALIGNBYTES
   46 #define _ALIGNBYTES     (sizeof(int) - 1)
   47 #endif
   48 #ifndef _ALIGN
   49 #define _ALIGN(p)       (((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
   50 #endif
   51 
   52 #ifndef _MACHINE
   53 #define _MACHINE        i386
   54 #endif
   55 #ifndef _MACHINE_ARCH
   56 #define _MACHINE_ARCH   i386
   57 #endif
   58 
   59 #ifndef _NO_NAMESPACE_POLLUTION
   60 
   61 #ifndef _MACHINE_PARAM_H_
   62 #define _MACHINE_PARAM_H_
   63 
   64 #ifndef MACHINE
   65 #define MACHINE         "i386"
   66 #endif
   67 #ifndef MACHINE_ARCH
   68 #define MACHINE_ARCH    "i386"
   69 #endif
   70 #define MID_MACHINE     MID_I386
   71 
   72 #ifdef SMP
   73 #define MAXCPU          16
   74 #else
   75 #define MAXCPU          1
   76 #endif /* SMP */
   77 
   78 #define ALIGNBYTES      _ALIGNBYTES
   79 #define ALIGN(p)        _ALIGN(p)
   80 
   81 #define PAGE_SHIFT      12              /* LOG2(PAGE_SIZE) */
   82 #define PAGE_SIZE       (1<<PAGE_SHIFT) /* bytes/page */
   83 #define PAGE_MASK       (PAGE_SIZE-1)
   84 #define NPTEPG          (PAGE_SIZE/(sizeof (pt_entry_t)))
   85 
   86 #ifdef PAE
   87 #define NPGPTD          4
   88 #define PDRSHIFT        21              /* LOG2(NBPDR) */
   89 #else
   90 #define NPGPTD          1
   91 #define PDRSHIFT        22              /* LOG2(NBPDR) */
   92 #endif
   93 
   94 #define NBPTD           (NPGPTD<<PAGE_SHIFT)
   95 #define NPDEPTD         (NBPTD/(sizeof (pd_entry_t)))
   96 #define NPDEPG          (PAGE_SIZE/(sizeof (pd_entry_t)))
   97 #define NBPDR           (1<<PDRSHIFT)   /* bytes/page dir */
   98 #define PDRMASK         (NBPDR-1)
   99 
  100 #define IOPAGES 2               /* pages of i/o permission bitmap */
  101 
  102 #ifndef KSTACK_PAGES
  103 #define KSTACK_PAGES 2          /* Includes pcb! */
  104 #endif
  105 #define KSTACK_GUARD_PAGES 1    /* pages of kstack guard; 0 disables */
  106 
  107 /*
  108  * Ceiling on amount of swblock kva space, can be changed via
  109  * the kern.maxswzone /boot/loader.conf variable.
  110  */
  111 #ifndef VM_SWZONE_SIZE_MAX
  112 #define VM_SWZONE_SIZE_MAX      (32 * 1024 * 1024)
  113 #endif
  114 
  115 /*
  116  * Ceiling on size of buffer cache (really only effects write queueing,
  117  * the VM page cache is not effected), can be changed via
  118  * the kern.maxbcache /boot/loader.conf variable.
  119  */
  120 #ifndef VM_BCACHE_SIZE_MAX
  121 #define VM_BCACHE_SIZE_MAX      (200 * 1024 * 1024)
  122 #endif
  123 
  124 /*
  125  * Mach derived conversion macros
  126  */
  127 #define trunc_page(x)           ((x) & ~PAGE_MASK)
  128 #define round_page(x)           (((x) + PAGE_MASK) & ~PAGE_MASK)
  129 #define trunc_4mpage(x)         ((x) & ~PDRMASK)
  130 #define round_4mpage(x)         ((((x)) + PDRMASK) & ~PDRMASK)
  131 
  132 #define atop(x)                 ((x) >> PAGE_SHIFT)
  133 #define ptoa(x)                 ((x) << PAGE_SHIFT)
  134 
  135 #define i386_btop(x)            ((x) >> PAGE_SHIFT)
  136 #define i386_ptob(x)            ((x) << PAGE_SHIFT)
  137 
  138 #define pgtok(x)                ((x) * (PAGE_SIZE / 1024))
  139 
  140 #endif /* !_MACHINE_PARAM_H_ */
  141 #endif /* !_NO_NAMESPACE_POLLUTION */

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