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      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 (at) 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_ */
     72