Home | History | Annotate | Line # | Download | only in uvm
uvm_aobj.h revision 1.15 
      1 /*	$NetBSD: uvm_aobj.h,v 1.15 2005/09/13 22:00:05 yamt 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  * 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 (at) 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 #if 0 /* notyet */
     62 #include "opt_vmswap.h"
     63 #else
     64 #define	VMSWAP
     65 #endif
     66 #endif
     67 
     68 /*
     69  * prototypes
     70  */
     71 
     72 void uao_init(void);
     73 int uao_set_swslot(struct uvm_object *, int, int);
     74 #if defined(VMSWAP)
     75 int uao_find_swslot(struct uvm_object *, int);
     76 void uao_dropswap(struct uvm_object *, int);
     77 int uao_swap_off(int, int);
     78 #else /* defined(VMSWAP) */
     79 #define	uao_find_swslot(obj, off)	0
     80 #define	uao_dropswap(obj, off)		/* nothing */
     81 #endif /* defined(VMSWAP) */
     82 
     83 /*
     84  * globals
     85  */
     86 
     87 extern struct uvm_pagerops aobj_pager;
     88 
     89 #endif /* _KERNEL */
     90 
     91 #endif /* _UVM_UVM_AOBJ_H_ */
     92