FreeBSD/Linux Kernel Cross Reference
sys/uvm/uvm_pager.h

     /*      $NetBSD: uvm_pager.h,v 1.28 2004/03/24 07:55:01 junyoung 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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Charles D. Cranor and
     *      Washington University.
     * 4. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission.
     *
     * 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. 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_fault_t, 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   /* 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_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 */
   
   /* page we are not interested in getting */
   #define PGO_DONTCARE ((struct vm_page *) -1L)   /* [get only] */
   
   #ifdef _KERNEL
   
   /*
    * handle inline options
    */
   
   #ifdef UVM_PAGER_INLINE
   #define PAGER_INLINE static __inline
   #else
   #define PAGER_INLINE /* nothing */
   #endif /* UVM_PAGER_INLINE */
   
   /*
    * prototypes
    */
   
   void    uvm_pager_init(void);
   PAGER_INLINE struct vm_page *uvm_pageratop(vaddr_t);
   vaddr_t uvm_pagermapin(struct vm_page **, int, int);
   void    uvm_pagermapout(vaddr_t, int);
   
   /* 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) */
   
   /*
    * 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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