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/8.0/sys/i386/include/param.h 195376 2009-07-05 17:45:48Z sam $
   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 _NO_NAMESPACE_POLLUTION
   53 
   54 #define __HAVE_ACPI
   55 #define __PCI_REROUTE_INTERRUPT
   56 
   57 #ifndef _MACHINE_PARAM_H_
   58 #define _MACHINE_PARAM_H_
   59 
   60 #ifndef MACHINE
   61 #define MACHINE         "i386"
   62 #endif
   63 #ifndef MACHINE_ARCH
   64 #define MACHINE_ARCH    "i386"
   65 #endif
   66 #define MID_MACHINE     MID_I386
   67 
   68 #if defined(SMP) || defined(KLD_MODULE)
   69 #define MAXCPU          32
   70 #else
   71 #define MAXCPU          1
   72 #endif /* SMP || KLD_MODULE */
   73 
   74 #define ALIGNBYTES      _ALIGNBYTES
   75 #define ALIGN(p)        _ALIGN(p)
   76 /*
   77  * ALIGNED_POINTER is a boolean macro that checks whether an address
   78  * is valid to fetch data elements of type t from on this architecture.
   79  * This does not reflect the optimal alignment, just the possibility
   80  * (within reasonable limits). 
   81  */
   82 #define ALIGNED_POINTER(p, t)   1
   83 
   84 /*
   85  * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
   86  * architecture.  It should be used with appropriate caution.
   87  */
   88 #define CACHE_LINE_SHIFT        7
   89 #define CACHE_LINE_SIZE         (1 << CACHE_LINE_SHIFT)
   90 
   91 #define PAGE_SHIFT      12              /* LOG2(PAGE_SIZE) */
   92 #define PAGE_SIZE       (1<<PAGE_SHIFT) /* bytes/page */
   93 #define PAGE_MASK       (PAGE_SIZE-1)
   94 #define NPTEPG          (PAGE_SIZE/(sizeof (pt_entry_t)))
   95 
   96 #ifdef PAE
   97 #define NPGPTD          4
   98 #define PDRSHIFT        21              /* LOG2(NBPDR) */
   99 #define NPGPTD_SHIFT    9
  100 #else
  101 #define NPGPTD          1
  102 #define PDRSHIFT        22              /* LOG2(NBPDR) */
  103 #define NPGPTD_SHIFT    10
  104 #endif
  105 
  106 #define NBPTD           (NPGPTD<<PAGE_SHIFT)
  107 #define NPDEPTD         (NBPTD/(sizeof (pd_entry_t)))
  108 #define NPDEPG          (PAGE_SIZE/(sizeof (pd_entry_t)))
  109 #define NBPDR           (1<<PDRSHIFT)   /* bytes/page dir */
  110 #define PDRMASK         (NBPDR-1)
  111 
  112 #define IOPAGES 2               /* pages of i/o permission bitmap */
  113 
  114 #ifndef KSTACK_PAGES
  115 #define KSTACK_PAGES 2          /* Includes pcb! */
  116 #endif
  117 #define KSTACK_GUARD_PAGES 1    /* pages of kstack guard; 0 disables */
  118 
  119 /*
  120  * Ceiling on amount of swblock kva space, can be changed via
  121  * the kern.maxswzone /boot/loader.conf variable.
  122  */
  123 #ifndef VM_SWZONE_SIZE_MAX
  124 #define VM_SWZONE_SIZE_MAX      (32 * 1024 * 1024)
  125 #endif
  126 
  127 /*
  128  * Ceiling on size of buffer cache (really only effects write queueing,
  129  * the VM page cache is not effected), can be changed via
  130  * the kern.maxbcache /boot/loader.conf variable.
  131  */
  132 #ifndef VM_BCACHE_SIZE_MAX
  133 #define VM_BCACHE_SIZE_MAX      (200 * 1024 * 1024)
  134 #endif
  135 
  136 /*
  137  * Mach derived conversion macros
  138  */
  139 #define trunc_page(x)           ((x) & ~PAGE_MASK)
  140 #define round_page(x)           (((x) + PAGE_MASK) & ~PAGE_MASK)
  141 #define trunc_4mpage(x)         ((x) & ~PDRMASK)
  142 #define round_4mpage(x)         ((((x)) + PDRMASK) & ~PDRMASK)
  143 
  144 #define atop(x)                 ((x) >> PAGE_SHIFT)
  145 #define ptoa(x)                 ((x) << PAGE_SHIFT)
  146 
  147 #define i386_btop(x)            ((x) >> PAGE_SHIFT)
  148 #define i386_ptob(x)            ((x) << PAGE_SHIFT)
  149 
  150 #define pgtok(x)                ((x) * (PAGE_SIZE / 1024))
  151 
  152 #endif /* !_MACHINE_PARAM_H_ */
  153 #endif /* !_NO_NAMESPACE_POLLUTION */

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