sys/uvm/uvm_aobj.h

   1 /*      $NetBSD: uvm_aobj.h,v 1.23 2013/10/18 17:48:44 christos Exp $   */
   2
   3 /*
   4  * Copyright (c) 1998 Chuck Silvers, Charles D. Cranor and
   5  *                    Washington University.
   6  * All rights reserved.
   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  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * from: Id: uvm_aobj.h,v 1.1.2.4 1998/02/06 05:19:28 chs Exp
  29  */
  30 /*
  31  * uvm_aobj.h: anonymous memory uvm_object pager
  32  *
  33  * author: Chuck Silvers <chuq@chuq.com>
  34  * started: Jan-1998
  35  *
  36  * - design mostly from Chuck Cranor
  37  */
  38
  39 #ifndef _UVM_UVM_AOBJ_H_
  40 #define _UVM_UVM_AOBJ_H_
  41
  42 /*
  43  * Flags for uao_create: UAO_FLAG_KERNOBJ and UAO_FLAG_KERNSWAP are
  44  * used only once, to initialise UVM.
  45  */
  46 #define UAO_FLAG_KERNOBJ        0x1     /* create kernel object */
  47 #define UAO_FLAG_KERNSWAP       0x2     /* enable kernel swap */
  48 #define UAO_FLAG_NOSWAP         0x8     /* aobj may not swap */
  49
  50 #ifdef _KERNEL
  51 #if defined(_KERNEL_OPT)
  52 #include "opt_vmswap.h"
  53 #endif
  54
  55 void    uao_init(void);
  56 int     uao_set_swslot(struct uvm_object *, int, int);
  57
  58 #if     defined(VMSWAP)
  59 int     uao_find_swslot(struct uvm_object *, int);
  60 void    uao_dropswap(struct uvm_object *, int);
  61 bool    uao_swap_off(int, int);
  62 void    uao_dropswap_range(struct uvm_object *, voff_t, voff_t);
  63 #else
  64 #define uao_find_swslot(obj, off)       (__USE(off), 0)
  65 #define uao_dropswap(obj, off)          /* nothing */
  66 #define uao_dropswap_range(obj, lo, hi) /* nothing */
  67 #endif
  68
  69 #endif /* _KERNEL */
  70
  71 #endif /* _UVM_UVM_AOBJ_H_ */