sys/uvm/uvm_aobj.h

   1 /*      $NetBSD$        */
   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  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by Charles D. Cranor and
  19  *      Washington University.
  20  * 4. The name of the author may not be used to endorse or promote products
  21  *    derived from this software without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  *
  34  * from: Id: uvm_aobj.h,v 1.1.2.4 1998/02/06 05:19:28 chs Exp
  35  */
  36 /*
  37  * uvm_aobj.h: anonymous memory uvm_object pager
  38  *
  39  * author: Chuck Silvers <chuq@chuq.com>
  40  * started: Jan-1998
  41  *
  42  * - design mostly from Chuck Cranor
  43  */
  44
  45 #ifndef _UVM_UVM_AOBJ_H_
  46 #define _UVM_UVM_AOBJ_H_
  47
  48 /*
  49  * flags
  50  */
  51
  52 /* flags for uao_create: can only be used one time (at bootup) */
  53 #define UAO_FLAG_KERNOBJ        0x1     /* create kernel object */
  54 #define UAO_FLAG_KERNSWAP       0x2     /* enable kernel swap */
  55
  56 /* internal flags */
  57 #define UAO_FLAG_NOSWAP         0x8     /* aobj can't swap (kernel obj only!) */
  58
  59 #ifdef _KERNEL
  60 #if defined(_KERNEL_OPT)
  61 #include "opt_vmswap.h"
  62 #endif
  63
  64 /*
  65  * prototypes
  66  */
  67
  68 void uao_init(void);
  69 int uao_set_swslot(struct uvm_object *, int, int);
  70 #if defined(VMSWAP)
  71 int uao_find_swslot(struct uvm_object *, int);
  72 void uao_dropswap(struct uvm_object *, int);
  73 bool uao_swap_off(int, int);
  74 void uao_dropswap_range(struct uvm_object *, voff_t, voff_t);
  75 #else /* defined(VMSWAP) */
  76 #define uao_find_swslot(obj, off)       0
  77 #define uao_dropswap(obj, off)          /* nothing */
  78 #define uao_dropswap_range(obj, lo, hi) /* nothing */
  79 #endif /* defined(VMSWAP) */
  80
  81 #endif /* _KERNEL */
  82
  83 #endif /* _UVM_UVM_AOBJ_H_ */