FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_param.h

     /*
      * Copyright (c) 1991, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * The Mach Operating System project at Carnegie-Mellon University.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      from: @(#)vm_param.h    8.1 (Berkeley) 6/11/93
     *
     *
     * Copyright (c) 1987, 1990 Carnegie-Mellon University.
     * All rights reserved.
     *
     * Authors: Avadis Tevanian, Jr., Michael Wayne Young
     *
     * Permission to use, copy, modify and distribute this software and
     * its documentation is hereby granted, provided that both the copyright
     * notice and this permission notice appear in all copies of the
     * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     *
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     *
     * Carnegie Mellon requests users of this software to return to
     *
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     *
     * any improvements or extensions that they make and grant Carnegie the
     * rights to redistribute these changes.
     *
     * $FreeBSD: src/sys/vm/vm_param.h,v 1.6.2.1 1999/09/05 08:24:40 peter Exp $
     */
    
    /*
     *      Machine independent virtual memory parameters.
     */
    
    #ifndef _VM_PARAM_
    #define _VM_PARAM_
    
    #include <machine/vmparam.h>
    
    /*
     *      The machine independent pages are refered to as PAGES.  A page
     *      is some number of hardware pages, depending on the target machine.
     */
    #define DEFAULT_PAGE_SIZE       4096
    
    #if 0
    
    /*
     *      All references to the size of a page should be done with PAGE_SIZE
     *      or PAGE_SHIFT.  The fact they are variables is hidden here so that
     *      we can easily make them constant if we so desire.
     */
    #ifndef PAGE_SIZE
    #define PAGE_SIZE       cnt.v_page_size /* size of page */
    #endif
    #ifndef PAGE_MASK
    #define PAGE_MASK       page_mask       /* size of page - 1 */
    #endif
    #ifndef PAGE_SHIFT
    #define PAGE_SHIFT      page_shift      /* bits to shift for pages */
    #endif
    
    #endif
   
   #ifdef KERNEL
   extern vm_size_t page_mask;
   extern int page_shift;
   
   #endif
   
   /*
    * CTL_VM identifiers
    */
   #define VM_METER                1       /* struct vmmeter */
   #define VM_LOADAVG              2       /* struct loadavg */
   #define VM_V_FREE_MIN           3       /* cnt.v_free_min */
   #define VM_V_FREE_TARGET        4       /* cnt.v_free_target */
   #define VM_V_FREE_RESERVED      5       /* cnt.v_free_reserved */
   #define VM_V_INACTIVE_TARGET    6       /* cnt.v_inactive_target */
   #define VM_V_CACHE_MIN          7       /* cnt.v_cache_max */
   #define VM_V_CACHE_MAX          8       /* cnt.v_cache_min */
   #define VM_V_PAGEOUT_FREE_MIN   9       /* cnt.v_pageout_free_min */
   #define VM_PAGEOUT_ALGORITHM    10      /* pageout algorithm */
   #define VM_SWAPPING_ENABLED     11      /* swapping enabled */
   #define VM_MAXID                12      /* number of valid vm ids */
   
   #define CTL_VM_NAMES { \
           { 0, 0 }, \
           { "vmmeter", CTLTYPE_STRUCT }, \
           { "loadavg", CTLTYPE_STRUCT }, \
           { "v_free_min", CTLTYPE_INT }, \
           { "v_free_target", CTLTYPE_INT }, \
           { "v_free_reserved", CTLTYPE_INT }, \
           { "v_inactive_target", CTLTYPE_INT }, \
           { "v_cache_min", CTLTYPE_INT }, \
           { "v_cache_max", CTLTYPE_INT }, \
           { "v_pageout_free_min", CTLTYPE_INT}, \
           { "pageout_algorithm", CTLTYPE_INT}, \
           { "swapping_enabled", CTLTYPE_INT},\
   }
   
   /*
    *      Return values from the VM routines.
    */
   #define KERN_SUCCESS            0
   #define KERN_INVALID_ADDRESS    1
   #define KERN_PROTECTION_FAILURE 2
   #define KERN_NO_SPACE           3
   #define KERN_INVALID_ARGUMENT   4
   #define KERN_FAILURE            5
   #define KERN_RESOURCE_SHORTAGE  6
   #define KERN_NOT_RECEIVER       7
   #define KERN_NO_ACCESS          8
   
   #ifndef ASSEMBLER
   /*
    *      Convert addresses to pages and vice versa.
    *      No rounding is used.
    */
   #ifdef KERNEL
   #define num_pages(x) \
           ((vm_offset_t)((((vm_offset_t)(x)) + PAGE_MASK) >> PAGE_SHIFT))
   
   extern vm_size_t mem_size;      /* size of physical memory (bytes) */
   extern vm_offset_t first_addr;  /* first physical page */
   extern vm_offset_t last_addr;   /* last physical page */
   #endif                          /* KERNEL */
   #endif                          /* ASSEMBLER */
   #endif                          /* _VM_PARAM_ */

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