/*      $NetBSD: uvm_pager.h,v 1.49 2020/05/19 22:22:15 ad 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;
struct uvm_object;

/*
* 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);

       /* mark object dirty */
       void    (*pgo_markdirty)(struct uvm_object *);
};

/* 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 [put] */
#define PGO_JOURNALLOCKED 0x020 /* journal is already locked [get/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_ */

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.