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/10.0/sys/i386/include/param.h 250338 2013-05-07 22:46:24Z attilio $
   34  */
   35 
   36 
   37 #ifndef _I386_INCLUDE_PARAM_H_
   38 #define _I386_INCLUDE_PARAM_H_
   39 
   40 #include <machine/_align.h>
   41 
   42 /*
   43  * Machine dependent constants for Intel 386.
   44  */
   45 
   46 
   47 #define __HAVE_ACPI
   48 #define __HAVE_PIR
   49 #define __PCI_REROUTE_INTERRUPT
   50 
   51 #ifndef MACHINE
   52 #define MACHINE         "i386"
   53 #endif
   54 #ifndef MACHINE_ARCH
   55 #define MACHINE_ARCH    "i386"
   56 #endif
   57 #define MID_MACHINE     MID_I386
   58 
   59 #if defined(SMP) || defined(KLD_MODULE)
   60 #ifndef MAXCPU
   61 #define MAXCPU          32
   62 #endif
   63 #else
   64 #define MAXCPU          1
   65 #endif /* SMP || KLD_MODULE */
   66 
   67 #ifndef MAXMEMDOM
   68 #define MAXMEMDOM       1
   69 #endif
   70 
   71 #define ALIGNBYTES      _ALIGNBYTES
   72 #define ALIGN(p)        _ALIGN(p)
   73 /*
   74  * ALIGNED_POINTER is a boolean macro that checks whether an address
   75  * is valid to fetch data elements of type t from on this architecture.
   76  * This does not reflect the optimal alignment, just the possibility
   77  * (within reasonable limits). 
   78  */
   79 #define ALIGNED_POINTER(p, t)   1
   80 
   81 /*
   82  * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
   83  * architecture.  It should be used with appropriate caution.
   84  */
   85 #define CACHE_LINE_SHIFT        7
   86 #define CACHE_LINE_SIZE         (1 << CACHE_LINE_SHIFT)
   87 
   88 #define PAGE_SHIFT      12              /* LOG2(PAGE_SIZE) */
   89 #define PAGE_SIZE       (1<<PAGE_SHIFT) /* bytes/page */
   90 #define PAGE_MASK       (PAGE_SIZE-1)
   91 #define NPTEPG          (PAGE_SIZE/(sizeof (pt_entry_t)))
   92 
   93 #ifdef PAE
   94 #define NPGPTD          4
   95 #define PDRSHIFT        21              /* LOG2(NBPDR) */
   96 #define NPGPTD_SHIFT    9
   97 #else
   98 #define NPGPTD          1
   99 #define PDRSHIFT        22              /* LOG2(NBPDR) */
  100 #define NPGPTD_SHIFT    10
  101 #endif
  102 
  103 #define NBPTD           (NPGPTD<<PAGE_SHIFT)
  104 #define NPDEPTD         (NBPTD/(sizeof (pd_entry_t)))
  105 #define NPDEPG          (PAGE_SIZE/(sizeof (pd_entry_t)))
  106 #define NBPDR           (1<<PDRSHIFT)   /* bytes/page dir */
  107 #define PDRMASK         (NBPDR-1)
  108 
  109 #define MAXPAGESIZES    2       /* maximum number of supported page sizes */
  110 
  111 #define IOPAGES 2               /* pages of i/o permission bitmap */
  112 
  113 #ifndef KSTACK_PAGES
  114 #define KSTACK_PAGES 2          /* Includes pcb! */
  115 #endif
  116 #define KSTACK_GUARD_PAGES 1    /* pages of kstack guard; 0 disables */
  117 
  118 /*
  119  * Ceiling on amount of swblock kva space, can be changed via
  120  * the kern.maxswzone /boot/loader.conf variable.
  121  *
  122  * 276 is sizeof(struct swblock), but we do not always have a definition
  123  * in scope for struct swblock, so we have to hardcode it.  Each struct
  124  * swblock holds metadata for 32 pages, so in theory, this is enough for
  125  * 16 GB of swap.  In practice, however, the usable amount is considerably
  126  * lower due to fragmentation.
  127  */
  128 #ifndef VM_SWZONE_SIZE_MAX
  129 #define VM_SWZONE_SIZE_MAX      (276 * 128 * 1024)
  130 #endif
  131 
  132 /*
  133  * Ceiling on size of buffer cache (really only effects write queueing,
  134  * the VM page cache is not effected), can be changed via
  135  * the kern.maxbcache /boot/loader.conf variable.
  136  *
  137  * The value is equal to the size of the auto-tuned buffer map for
  138  * the machine with 4GB of RAM, see vfs_bio.c:kern_vfs_bio_buffer_alloc().
  139  */
  140 #ifndef VM_BCACHE_SIZE_MAX
  141 #define VM_BCACHE_SIZE_MAX      (7224 * 16 * 1024)
  142 #endif
  143 
  144 /*
  145  * Mach derived conversion macros
  146  */
  147 #define trunc_page(x)           ((x) & ~PAGE_MASK)
  148 #define round_page(x)           (((x) + PAGE_MASK) & ~PAGE_MASK)
  149 #define trunc_4mpage(x)         ((x) & ~PDRMASK)
  150 #define round_4mpage(x)         ((((x)) + PDRMASK) & ~PDRMASK)
  151 
  152 #define atop(x)                 ((x) >> PAGE_SHIFT)
  153 #define ptoa(x)                 ((x) << PAGE_SHIFT)
  154 
  155 #define i386_btop(x)            ((x) >> PAGE_SHIFT)
  156 #define i386_ptob(x)            ((x) << PAGE_SHIFT)
  157 
  158 #define pgtok(x)                ((x) * (PAGE_SIZE / 1024))
  159 
  160 #endif /* !_I386_INCLUDE_PARAM_H_ */

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