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/* $NetBSD: uvm_pager.h,v 1.43 2012/04/29 22:54:01 chs Exp $ */
/*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* from: Id: uvm_pager.h,v 1.1.2.14 1998/01/13 19:00:50 chuck Exp
*/
/*
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)vm_pager.h 8.5 (Berkeley) 7/7/94
*/
/*
* Copyright (c) 1990 University of Utah.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)vm_pager.h 8.5 (Berkeley) 7/7/94
*/
#ifndef _UVM_UVM_PAGER_H_
#define _UVM_UVM_PAGER_H_
/*
* uvm_pager.h
*/
/*
* forward structure declarations
*/
struct uvm_faultinfo;
/*
* pager ops
*/
struct uvm_pagerops {
/* init pager */
void (*pgo_init)(void);
/* add reference to obj */
void (*pgo_reference)(struct uvm_object *);
/* drop reference to obj */
void (*pgo_detach)(struct uvm_object *);
/* special non-standard fault processing */
int (*pgo_fault)(struct uvm_faultinfo *, vaddr_t, struct vm_page **,
int, int, vm_prot_t, int);
/* get/read pages */
int (*pgo_get)(struct uvm_object *, voff_t, struct vm_page **,
int *, int, vm_prot_t, int, int);
/* put/write pages */
int (*pgo_put)(struct uvm_object *, voff_t, voff_t, int);
};
/* pager flags [mostly for flush] */
#define PGO_CLEANIT 0x001 /* write dirty pages to backing store */
#define PGO_SYNCIO 0x002 /* use sync I/O */
#define PGO_DEACTIVATE 0x004 /* deactivate flushed pages */
#define PGO_FREE 0x008 /* free flushed pages */
/* if PGO_FREE is not set then the pages stay where they are. */
#define PGO_ALLPAGES 0x010 /* flush whole object/get all pages */
#define PGO_JOURNALLOCKED 0x020 /* journal is already locked [put] */
#define PGO_LOCKED 0x040 /* fault data structures are locked [get] */
#define PGO_BUSYFAIL 0x080 /* fail if a page is busy [put] */
#define PGO_OVERWRITE 0x200 /* pages will be overwritten before unlocked */
#define PGO_PASTEOF 0x400 /* allow allocation of pages past EOF */
#define PGO_NOBLOCKALLOC 0x800 /* backing block allocation is not needed */
#define PGO_NOTIMESTAMP 0x1000 /* don't mark object accessed/modified */
#define PGO_RECLAIM 0x2000 /* object is being reclaimed */
#define PGO_GLOCKHELD 0x4000 /* genfs_node's lock is already held */
#define PGO_LAZY 0x8000 /* equivalent of MNT_LAZY / FSYNC_LAZY */
/* page we are not interested in getting */
#define PGO_DONTCARE ((struct vm_page *) -1L) /* [get only] */
#ifdef _KERNEL
/*
* prototypes
*/
void uvm_pager_init(void);
void uvm_pager_realloc_emerg(void);
struct vm_page *uvm_pageratop(vaddr_t);
vaddr_t uvm_pagermapin(struct vm_page **, int, int);
void uvm_pagermapout(vaddr_t, int);
extern size_t pager_map_size;
/* Flags to uvm_pagermapin() */
#define UVMPAGER_MAPIN_WAITOK 0x01 /* it's okay to wait */
#define UVMPAGER_MAPIN_READ 0x02 /* device -> host */
#define UVMPAGER_MAPIN_WRITE 0x00 /* host -> device (pseudo flag) */
#endif /* _KERNEL */
#endif /* _UVM_UVM_PAGER_H_ */
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