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uvm_aobj.h revision 1.17 
      1 /*	$NetBSD: uvm_aobj.h,v 1.17 2005/11/08 23:02:22 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 #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 int 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 /*
     82  * globals
     83  */
     84 
     85 extern struct uvm_pagerops aobj_pager;
     86 
     87 #endif /* _KERNEL */
     88 
     89 #endif /* _UVM_UVM_AOBJ_H_ */
     90