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/9.0/sys/i386/include/param.h 224207 2011-07-19 00:37:24Z attilio $
   34  */
   35 
   36 #include <machine/_align.h>
   37 
   38 #ifndef _I386_INCLUDE_PARAM_H_
   39 #define _I386_INCLUDE_PARAM_H_
   40 
   41 /*
   42  * Machine dependent constants for Intel 386.
   43  */
   44 
   45 /*
   46  * Round p (pointer or byte index) up to a correctly-aligned value
   47  * for all data types (int, long, ...).   The result is unsigned int
   48  * and must be cast to any desired pointer type.
   49  */
   50 #ifndef _ALIGNBYTES
   51 #define _ALIGNBYTES     (sizeof(int) - 1)
   52 #endif
   53 #ifndef _ALIGN
   54 #define _ALIGN(p)       (((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
   55 #endif
   56 
   57 
   58 #define __HAVE_ACPI
   59 #define __HAVE_PIR
   60 #define __PCI_REROUTE_INTERRUPT
   61 
   62 #ifndef MACHINE
   63 #define MACHINE         "i386"
   64 #endif
   65 #ifndef MACHINE_ARCH
   66 #define MACHINE_ARCH    "i386"
   67 #endif
   68 #define MID_MACHINE     MID_I386
   69 
   70 #if defined(SMP) || defined(KLD_MODULE)
   71 #ifndef MAXCPU
   72 #define MAXCPU          32
   73 #endif
   74 #else
   75 #define MAXCPU          1
   76 #endif /* SMP || KLD_MODULE */
   77 
   78 #define ALIGNBYTES      _ALIGNBYTES
   79 #define ALIGN(p)        _ALIGN(p)
   80 /*
   81  * ALIGNED_POINTER is a boolean macro that checks whether an address
   82  * is valid to fetch data elements of type t from on this architecture.
   83  * This does not reflect the optimal alignment, just the possibility
   84  * (within reasonable limits). 
   85  */
   86 #define ALIGNED_POINTER(p, t)   1
   87 
   88 /*
   89  * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
   90  * architecture.  It should be used with appropriate caution.
   91  */
   92 #define CACHE_LINE_SHIFT        7
   93 #define CACHE_LINE_SIZE         (1 << CACHE_LINE_SHIFT)
   94 
   95 #define PAGE_SHIFT      12              /* LOG2(PAGE_SIZE) */
   96 #define PAGE_SIZE       (1<<PAGE_SHIFT) /* bytes/page */
   97 #define PAGE_MASK       (PAGE_SIZE-1)
   98 #define NPTEPG          (PAGE_SIZE/(sizeof (pt_entry_t)))
   99 
  100 #ifdef PAE
  101 #define NPGPTD          4
  102 #define PDRSHIFT        21              /* LOG2(NBPDR) */
  103 #define NPGPTD_SHIFT    9
  104 #else
  105 #define NPGPTD          1
  106 #define PDRSHIFT        22              /* LOG2(NBPDR) */
  107 #define NPGPTD_SHIFT    10
  108 #endif
  109 
  110 #define NBPTD           (NPGPTD<<PAGE_SHIFT)
  111 #define NPDEPTD         (NBPTD/(sizeof (pd_entry_t)))
  112 #define NPDEPG          (PAGE_SIZE/(sizeof (pd_entry_t)))
  113 #define NBPDR           (1<<PDRSHIFT)   /* bytes/page dir */
  114 #define PDRMASK         (NBPDR-1)
  115 
  116 #define MAXPAGESIZES    2       /* maximum number of supported page sizes */
  117 
  118 #define IOPAGES 2               /* pages of i/o permission bitmap */
  119 
  120 #ifndef KSTACK_PAGES
  121 #define KSTACK_PAGES 2          /* Includes pcb! */
  122 #endif
  123 #define KSTACK_GUARD_PAGES 1    /* pages of kstack guard; 0 disables */
  124 
  125 /*
  126  * Ceiling on amount of swblock kva space, can be changed via
  127  * the kern.maxswzone /boot/loader.conf variable.
  128  */
  129 #ifndef VM_SWZONE_SIZE_MAX
  130 #define VM_SWZONE_SIZE_MAX      (32 * 1024 * 1024)
  131 #endif
  132 
  133 /*
  134  * Ceiling on size of buffer cache (really only effects write queueing,
  135  * the VM page cache is not effected), can be changed via
  136  * the kern.maxbcache /boot/loader.conf variable.
  137  */
  138 #ifndef VM_BCACHE_SIZE_MAX
  139 #define VM_BCACHE_SIZE_MAX      (200 * 1024 * 1024)
  140 #endif
  141 
  142 /*
  143  * Mach derived conversion macros
  144  */
  145 #define trunc_page(x)           ((x) & ~PAGE_MASK)
  146 #define round_page(x)           (((x) + PAGE_MASK) & ~PAGE_MASK)
  147 #define trunc_4mpage(x)         ((x) & ~PDRMASK)
  148 #define round_4mpage(x)         ((((x)) + PDRMASK) & ~PDRMASK)
  149 
  150 #define atop(x)                 ((x) >> PAGE_SHIFT)
  151 #define ptoa(x)                 ((x) << PAGE_SHIFT)
  152 
  153 #define i386_btop(x)            ((x) >> PAGE_SHIFT)
  154 #define i386_ptob(x)            ((x) << PAGE_SHIFT)
  155 
  156 #define pgtok(x)                ((x) * (PAGE_SIZE / 1024))
  157 
  158 #endif /* !_I386_INCLUDE_PARAM_H_ */

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