/* $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_ */