sys/uvm/uvm_swap.h

   1 /*      $NetBSD: uvm_swap.h,v 1.22 2015/07/30 10:25:49 christos Exp $   */
   2
   3 /*
   4  * Copyright (c) 1997 Matthew R. Green
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * from: Id: uvm_swap.h,v 1.1.2.6 1997/12/15 05:39:31 mrg Exp
  29  */
  30
  31 #ifndef _UVM_UVM_SWAP_H_
  32 #define _UVM_UVM_SWAP_H_
  33
  34 #define SWSLOT_BAD      (-1)
  35
  36 #if defined(_KERNEL) || defined(_MODULE)
  37 #if defined(_KERNEL_OPT)
  38 #include "opt_vmswap.h"
  39 #endif
  40
  41 struct swapent;
  42 struct lwp;
  43
  44 #if defined(VMSWAP)
  45 int     uvm_swap_get(struct vm_page *, int, int);
  46 int     uvm_swap_put(int, struct vm_page **, int, int);
  47 int     uvm_swap_alloc(int *, bool);
  48 void    uvm_swap_free(int, int);
  49 void    uvm_swap_markbad(int, int);
  50 bool    uvm_swapisfull(void);
  51 void    swapsys_lock(krw_t);
  52 void    swapsys_unlock(void);
  53 void    uvm_swap_stats(int, struct swapent *, int, register_t *);
  54
  55 #else /* defined(VMSWAP) */
  56 #define uvm_swapisfull()        true
  57 #define uvm_swap_stats(c, sep, count, retval) { *retval = 0; }
  58 #endif /* defined(VMSWAP) */
  59 void    uvm_swap_shutdown(struct lwp *);
  60
  61 #endif /* _KERNEL || _MODULE */
  62
  63 #endif /* _UVM_UVM_SWAP_H_ */