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/vm/vm_param.h

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    1 /*
    2  * Copyright (c) 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * The Mach Operating System project at Carnegie-Mellon University.
    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: @(#)vm_param.h    8.1 (Berkeley) 6/11/93
   37  *
   38  *
   39  * Copyright (c) 1987, 1990 Carnegie-Mellon University.
   40  * All rights reserved.
   41  *
   42  * Authors: Avadis Tevanian, Jr., Michael Wayne Young
   43  *
   44  * Permission to use, copy, modify and distribute this software and
   45  * its documentation is hereby granted, provided that both the copyright
   46  * notice and this permission notice appear in all copies of the
   47  * software, derivative works or modified versions, and any portions
   48  * thereof, and that both notices appear in supporting documentation.
   49  *
   50  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   51  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
   52  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   53  *
   54  * Carnegie Mellon requests users of this software to return to
   55  *
   56  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   57  *  School of Computer Science
   58  *  Carnegie Mellon University
   59  *  Pittsburgh PA 15213-3890
   60  *
   61  * any improvements or extensions that they make and grant Carnegie the
   62  * rights to redistribute these changes.
   63  *
   64  * $FreeBSD$
   65  */
   66 
   67 /*
   68  *      Machine independent virtual memory parameters.
   69  */
   70 
   71 #ifndef _VM_PARAM_
   72 #define _VM_PARAM_
   73 
   74 #include <machine/vmparam.h>
   75 
   76 /*
   77  *      The machine independent pages are refered to as PAGES.  A page
   78  *      is some number of hardware pages, depending on the target machine.
   79  */
   80 #define DEFAULT_PAGE_SIZE       4096
   81 
   82 #if 0
   83 
   84 /*
   85  *      All references to the size of a page should be done with PAGE_SIZE
   86  *      or PAGE_SHIFT.  The fact they are variables is hidden here so that
   87  *      we can easily make them constant if we so desire.
   88  */
   89 #ifndef PAGE_SIZE
   90 #define PAGE_SIZE       cnt.v_page_size /* size of page */
   91 #endif
   92 #ifndef PAGE_MASK
   93 #define PAGE_MASK       page_mask       /* size of page - 1 */
   94 #endif
   95 #ifndef PAGE_SHIFT
   96 #define PAGE_SHIFT      page_shift      /* bits to shift for pages */
   97 #endif
   98 
   99 #endif
  100 
  101 #ifdef KERNEL
  102 extern vm_size_t page_mask;
  103 extern int page_shift;
  104 
  105 #endif
  106 
  107 /*
  108  * CTL_VM identifiers
  109  */
  110 #define VM_METER                1       /* struct vmmeter */
  111 #define VM_LOADAVG              2       /* struct loadavg */
  112 #define VM_V_FREE_MIN           3       /* cnt.v_free_min */
  113 #define VM_V_FREE_TARGET        4       /* cnt.v_free_target */
  114 #define VM_V_FREE_RESERVED      5       /* cnt.v_free_reserved */
  115 #define VM_V_INACTIVE_TARGET    6       /* cnt.v_inactive_target */
  116 #define VM_V_CACHE_MIN          7       /* cnt.v_cache_max */
  117 #define VM_V_CACHE_MAX          8       /* cnt.v_cache_min */
  118 #define VM_V_PAGEOUT_FREE_MIN   9       /* cnt.v_pageout_free_min */
  119 #define VM_PAGEOUT_ALGORITHM    10      /* pageout algorithm */
  120 #define VM_SWAPPING_ENABLED     11      /* swapping enabled */
  121 #define VM_MAXID                12      /* number of valid vm ids */
  122 
  123 #define CTL_VM_NAMES { \
  124         { 0, 0 }, \
  125         { "vmmeter", CTLTYPE_STRUCT }, \
  126         { "loadavg", CTLTYPE_STRUCT }, \
  127         { "v_free_min", CTLTYPE_INT }, \
  128         { "v_free_target", CTLTYPE_INT }, \
  129         { "v_free_reserved", CTLTYPE_INT }, \
  130         { "v_inactive_target", CTLTYPE_INT }, \
  131         { "v_cache_min", CTLTYPE_INT }, \
  132         { "v_cache_max", CTLTYPE_INT }, \
  133         { "v_pageout_free_min", CTLTYPE_INT}, \
  134         { "pageout_algorithm", CTLTYPE_INT}, \
  135         { "swapping_enabled", CTLTYPE_INT},\
  136 }
  137 
  138 /*
  139  *      Return values from the VM routines.
  140  */
  141 #define KERN_SUCCESS            0
  142 #define KERN_INVALID_ADDRESS    1
  143 #define KERN_PROTECTION_FAILURE 2
  144 #define KERN_NO_SPACE           3
  145 #define KERN_INVALID_ARGUMENT   4
  146 #define KERN_FAILURE            5
  147 #define KERN_RESOURCE_SHORTAGE  6
  148 #define KERN_NOT_RECEIVER       7
  149 #define KERN_NO_ACCESS          8
  150 
  151 #ifndef ASSEMBLER
  152 #ifdef KERNEL
  153 #define num_pages(x) \
  154         ((vm_offset_t)((((vm_offset_t)(x)) + PAGE_MASK) >> PAGE_SHIFT))
  155 
  156 extern vm_size_t mem_size;      /* size of physical memory (bytes) */
  157 extern vm_offset_t first_addr;  /* first physical page */
  158 extern vm_offset_t last_addr;   /* last physical page */
  159 #endif                          /* KERNEL */
  160 #endif                          /* ASSEMBLER */
  161 #endif                          /* _VM_PARAM_ */

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