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: releng/5.2/sys/i386/include/param.h 116355 2003-06-14 23:23:55Z alc $
   38  */
   39 
   40 /*
   41  * Machine dependent constants for Intel 386.
   42  */
   43 
   44 /*
   45  * Round p (pointer or byte index) up to a correctly-aligned value
   46  * for all data types (int, long, ...).   The result is unsigned int
   47  * and must be cast to any desired pointer type.
   48  */
   49 #ifndef _ALIGNBYTES
   50 #define _ALIGNBYTES     (sizeof(int) - 1)
   51 #endif
   52 #ifndef _ALIGN
   53 #define _ALIGN(p)       (((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
   54 #endif
   55 
   56 #ifndef _MACHINE
   57 #define _MACHINE        i386
   58 #endif
   59 #ifndef _MACHINE_ARCH
   60 #define _MACHINE_ARCH   i386
   61 #endif
   62 
   63 #ifndef _NO_NAMESPACE_POLLUTION
   64 
   65 #ifndef _MACHINE_PARAM_H_
   66 #define _MACHINE_PARAM_H_
   67 
   68 #ifndef MACHINE
   69 #define MACHINE         "i386"
   70 #endif
   71 #ifndef MACHINE_ARCH
   72 #define MACHINE_ARCH    "i386"
   73 #endif
   74 #define MID_MACHINE     MID_I386
   75 
   76 #ifdef SMP
   77 #define MAXCPU          16
   78 #else
   79 #define MAXCPU          1
   80 #endif /* SMP */
   81 
   82 #define ALIGNBYTES      _ALIGNBYTES
   83 #define ALIGN(p)        _ALIGN(p)
   84 
   85 #define PAGE_SHIFT      12              /* LOG2(PAGE_SIZE) */
   86 #define PAGE_SIZE       (1<<PAGE_SHIFT) /* bytes/page */
   87 #define PAGE_MASK       (PAGE_SIZE-1)
   88 #define NPTEPG          (PAGE_SIZE/(sizeof (pt_entry_t)))
   89 
   90 #ifdef PAE
   91 #define NPGPTD          4
   92 #define PDRSHIFT        21              /* LOG2(NBPDR) */
   93 #else
   94 #define NPGPTD          1
   95 #define PDRSHIFT        22              /* LOG2(NBPDR) */
   96 #endif
   97 
   98 #define NBPTD           (NPGPTD<<PAGE_SHIFT)
   99 #define NPDEPTD         (NBPTD/(sizeof (pd_entry_t)))
  100 #define NPDEPG          (PAGE_SIZE/(sizeof (pd_entry_t)))
  101 #define NBPDR           (1<<PDRSHIFT)   /* bytes/page dir */
  102 #define PDRMASK         (NBPDR-1)
  103 
  104 #define IOPAGES 2               /* pages of i/o permission bitmap */
  105 
  106 #ifndef KSTACK_PAGES
  107 #define KSTACK_PAGES 2          /* Includes pcb! */
  108 #endif
  109 #define KSTACK_GUARD_PAGES 1    /* pages of kstack guard; 0 disables */
  110 #define UAREA_PAGES 1           /* holds struct user WITHOUT PCB (see def.) */
  111 
  112 /*
  113  * Ceiling on amount of swblock kva space, can be changed via
  114  * the kern.maxswzone /boot/loader.conf variable.
  115  */
  116 #ifndef VM_SWZONE_SIZE_MAX
  117 #define VM_SWZONE_SIZE_MAX      (32 * 1024 * 1024)
  118 #endif
  119 
  120 /*
  121  * Ceiling on size of buffer cache (really only effects write queueing,
  122  * the VM page cache is not effected), can be changed via
  123  * the kern.maxbcache /boot/loader.conf variable.
  124  */
  125 #ifndef VM_BCACHE_SIZE_MAX
  126 #define VM_BCACHE_SIZE_MAX      (200 * 1024 * 1024)
  127 #endif
  128 
  129 /*
  130  * Mach derived conversion macros
  131  */
  132 #define trunc_page(x)           ((x) & ~PAGE_MASK)
  133 #define round_page(x)           (((x) + PAGE_MASK) & ~PAGE_MASK)
  134 #define trunc_4mpage(x)         ((x) & ~PDRMASK)
  135 #define round_4mpage(x)         ((((x)) + PDRMASK) & ~PDRMASK)
  136 
  137 #define atop(x)                 ((x) >> PAGE_SHIFT)
  138 #define ptoa(x)                 ((x) << PAGE_SHIFT)
  139 
  140 #define i386_btop(x)            ((x) >> PAGE_SHIFT)
  141 #define i386_ptob(x)            ((x) << PAGE_SHIFT)
  142 
  143 #define pgtok(x)                ((x) * (PAGE_SIZE / 1024))
  144 
  145 #endif /* !_MACHINE_PARAM_H_ */
  146 #endif /* !_NO_NAMESPACE_POLLUTION */

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