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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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