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/* $OpenBSD: uvm_pager.h,v 1.29 2014/07/11 16:35:40 jsg Exp $ */
/* $NetBSD: uvm_pager.h,v 1.20 2000/11/27 08:40:05 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) 1990 University of Utah.
* 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
*/
#ifndef _UVM_UVM_PAGER_H_
#define _UVM_UVM_PAGER_H_
#ifdef _KERNEL
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 nonstd fault fn */
int (*pgo_fault)(struct uvm_faultinfo *, vaddr_t,
vm_page_t *, int, int, vm_fault_t,
vm_prot_t, int);
/* flush pages out of obj */
boolean_t (*pgo_flush)(struct uvm_object *, voff_t,
voff_t, int);
/* get/read page */
int (*pgo_get)(struct uvm_object *, voff_t,
vm_page_t *, int *, int, vm_prot_t, int, int);
/* put/write page */
int (*pgo_put)(struct uvm_object *, vm_page_t *,
int, boolean_t);
/* return range of cluster */
void (*pgo_cluster)(struct uvm_object *, voff_t,
voff_t *, voff_t *);
/* make "put" cluster */
struct vm_page ** (*pgo_mk_pcluster)(struct uvm_object *,
struct vm_page **, int *, struct vm_page *,
int, voff_t, voff_t);
};
/* pager flags [mostly for flush] */
#define PGO_CLEANIT 0x001 /* write dirty pages to backing store */
#define PGO_SYNCIO 0x002 /* if PGO_CLEANIT: 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_DOACTCLUST 0x020 /* flag to mk_pcluster to include active */
#define PGO_LOCKED 0x040 /* fault data structures are locked [get] */
#define PGO_PDFREECLUST 0x080 /* daemon's free cluster flag [uvm_pager_put] */
#define PGO_REALLOCSWAP 0x100 /* reallocate swap area [pager_dropcluster] */
/* page we are not interested in getting */
#define PGO_DONTCARE ((struct vm_page *) -1L) /* [get only] */
/*
* prototypes
*/
void uvm_pager_dropcluster(struct uvm_object *, struct vm_page *,
struct vm_page **, int *, int);
void uvm_pager_init(void);
int uvm_pager_put(struct uvm_object *, struct vm_page *,
struct vm_page ***, int *, int, voff_t, voff_t);
vaddr_t uvm_pagermapin(struct vm_page **, int, int);
void uvm_pagermapout(vaddr_t, int);
struct vm_page **uvm_mk_pcluster(struct uvm_object *, struct vm_page **,
int *, struct vm_page *, int, voff_t, voff_t);
/* Flags to uvm_pagermapin() */
#define UVMPAGER_MAPIN_WAITOK 0x01 /* it's okay to wait */
#define UVMPAGER_MAPIN_READ 0x02 /* host <- device */
#define UVMPAGER_MAPIN_WRITE 0x00 /* device -> host (pseudo flag) */
/*
* get/put return values
* OK operation was successful
* BAD specified data was out of the accepted range
* FAIL specified data was in range, but doesn't exist
* PEND operations was initiated but not completed
* ERROR error while accessing data that is in range and exists
* AGAIN temporary resource shortage prevented operation from happening
* UNLOCK unlock the map and try again
* REFAULT [uvm_fault internal use only!] unable to relock data structures,
* thus the mapping needs to be reverified before we can procede
*/
#define VM_PAGER_OK 0
#define VM_PAGER_BAD 1
#define VM_PAGER_FAIL 2
#define VM_PAGER_PEND 3
#define VM_PAGER_ERROR 4
#define VM_PAGER_AGAIN 5
#define VM_PAGER_UNLOCK 6
#define VM_PAGER_REFAULT 7
/*
* XXX
* this is needed until the device strategy interface
* is changed to do physically-addressed i/o.
*/
#ifndef PAGER_MAP_SIZE
#define PAGER_MAP_SIZE (16 * 1024 * 1024)
#endif
#endif /* _KERNEL */
#endif /* _UVM_UVM_PAGER_H_ */
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