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