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/* $OpenBSD: uvm_pager.h,v 1.11 2001/08/12 21:36:48 mickey Exp $ */
/* $NetBSD: uvm_pager.h,v 1.15 2000/05/19 03:45:04 thorpej 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
*/
#ifndef _UVM_UVM_PAGER_H_
#define _UVM_UVM_PAGER_H_
/*
* uvm_pager.h
*/
/*
* async pager i/o descriptor structure
*/
TAILQ_HEAD(uvm_aiohead, uvm_aiodesc);
struct uvm_aiodesc {
void (*aiodone) __P((struct uvm_aiodesc *));
/* aio done function */
vaddr_t kva; /* KVA of mapped page(s) */
int npages; /* # of pages in I/O req */
void *pd_ptr; /* pager-dependent pointer */
TAILQ_ENTRY(uvm_aiodesc) aioq; /* linked list of aio's */
};
/*
* pager ops
*/
struct uvm_pagerops {
void (*pgo_init) __P((void));/* init pager */
void (*pgo_reference) /* add reference to obj */
__P((struct uvm_object *));
void (*pgo_detach) /* drop reference to obj */
__P((struct uvm_object *));
int (*pgo_fault) /* special nonstd fault fn */
__P((struct uvm_faultinfo *, vaddr_t,
vm_page_t *, int, int, vm_fault_t,
vm_prot_t, int));
boolean_t (*pgo_flush) /* flush pages out of obj */
__P((struct uvm_object *, voff_t, voff_t, int));
int (*pgo_get) /* get/read page */
__P((struct uvm_object *, voff_t,
vm_page_t *, int *, int, vm_prot_t, int, int));
int (*pgo_asyncget) /* start async get */
__P((struct uvm_object *, voff_t, int));
int (*pgo_put) /* put/write page */
__P((struct uvm_object *, vm_page_t *,
int, boolean_t));
void (*pgo_cluster) /* return range of cluster */
__P((struct uvm_object *, voff_t, voff_t *,
voff_t *));
struct vm_page ** (*pgo_mk_pcluster) /* make "put" cluster */
__P((struct uvm_object *, struct vm_page **,
int *, struct vm_page *, int, voff_t,
voff_t));
void (*pgo_aiodone) /* async iodone */
__P((struct uvm_aiodesc *));
boolean_t (*pgo_releasepg) /* release page */
__P((struct vm_page *, struct vm_page **));
};
/* pager flags [mostly for flush] */
#define PGO_CLEANIT 0x001 /* write dirty pages to backing store */
#define PGO_SYNCIO 0x002 /* if PGO_CLEAN: use sync I/O? */
/*
* obviously if neither PGO_INVALIDATE or PGO_FREE are set then the pages
* stay where they are.
*/
#define PGO_DEACTIVATE 0x004 /* deactivate flushed pages */
#define PGO_FREE 0x008 /* free flushed pages */
#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 *) -1) /* [get only] */
#ifdef _KERNEL
/*
* 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
/*
* 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_dropcluster __P((struct uvm_object *,
struct vm_page *, struct vm_page **,
int *, int));
void uvm_pager_init __P((void));
int uvm_pager_put __P((struct uvm_object *, struct vm_page *,
struct vm_page ***, int *, int,
voff_t, voff_t));
PAGER_INLINE struct vm_page *uvm_pageratop __P((vaddr_t));
vaddr_t uvm_pagermapin __P((struct vm_page **, int,
struct uvm_aiodesc **, int));
void uvm_pagermapout __P((vaddr_t, int));
struct vm_page **uvm_mk_pcluster __P((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) */
#endif /* _KERNEL */
#endif /* _UVM_UVM_PAGER_H_ */
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