157 lines
5.5 KiB
C
157 lines
5.5 KiB
C
/* $NetBSD: uvm_pager.h,v 1.15 2000/05/19 03:45:04 thorpej Exp $ */
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/*
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Charles D. Cranor and
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* Washington University.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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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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#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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* async pager i/o descriptor structure
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*/
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TAILQ_HEAD(uvm_aiohead, uvm_aiodesc);
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struct uvm_aiodesc {
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void (*aiodone) __P((struct uvm_aiodesc *));
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/* aio done function */
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vaddr_t kva; /* KVA of mapped page(s) */
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int npages; /* # of pages in I/O req */
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void *pd_ptr; /* pager-dependent pointer */
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TAILQ_ENTRY(uvm_aiodesc) aioq; /* linked list of aio's */
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};
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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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void (*pgo_init) __P((void));/* init pager */
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void (*pgo_reference) /* add reference to obj */
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__P((struct uvm_object *));
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void (*pgo_detach) /* drop reference to obj */
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__P((struct uvm_object *));
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int (*pgo_fault) /* special nonstd fault fn */
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__P((struct uvm_faultinfo *, vaddr_t,
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vm_page_t *, int, int, vm_fault_t,
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vm_prot_t, int));
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boolean_t (*pgo_flush) /* flush pages out of obj */
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__P((struct uvm_object *, voff_t, voff_t, int));
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int (*pgo_get) /* get/read page */
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__P((struct uvm_object *, voff_t,
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vm_page_t *, int *, int, vm_prot_t, int, int));
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int (*pgo_asyncget) /* start async get */
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__P((struct uvm_object *, voff_t, int));
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int (*pgo_put) /* put/write page */
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__P((struct uvm_object *, vm_page_t *,
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int, boolean_t));
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void (*pgo_cluster) /* return range of cluster */
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__P((struct uvm_object *, voff_t, voff_t *,
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voff_t *));
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struct vm_page ** (*pgo_mk_pcluster) /* make "put" cluster */
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__P((struct uvm_object *, struct vm_page **,
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int *, struct vm_page *, int, voff_t,
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voff_t));
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void (*pgo_aiodone) /* async iodone */
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__P((struct uvm_aiodesc *));
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boolean_t (*pgo_releasepg) /* release page */
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__P((struct vm_page *, struct vm_page **));
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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 /* if PGO_CLEAN: use sync I/O? */
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/*
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* obviously if neither PGO_INVALIDATE or PGO_FREE are set then the pages
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* stay where they are.
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*/
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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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#define PGO_ALLPAGES 0x010 /* flush whole object/get all pages */
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#define PGO_DOACTCLUST 0x020 /* flag to mk_pcluster to include active */
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#define PGO_LOCKED 0x040 /* fault data structures are locked [get] */
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#define PGO_PDFREECLUST 0x080 /* daemon's free cluster flag [uvm_pager_put] */
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#define PGO_REALLOCSWAP 0x100 /* reallocate swap area [pager_dropcluster] */
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/* page we are not interested in getting */
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#define PGO_DONTCARE ((struct vm_page *) -1) /* [get only] */
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#ifdef _KERNEL
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/*
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* handle inline options
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*/
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#ifdef UVM_PAGER_INLINE
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#define PAGER_INLINE static __inline
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#else
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#define PAGER_INLINE /* nothing */
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#endif /* UVM_PAGER_INLINE */
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/*
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* prototypes
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*/
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void uvm_pager_dropcluster __P((struct uvm_object *,
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struct vm_page *, struct vm_page **,
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int *, int));
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void uvm_pager_init __P((void));
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int uvm_pager_put __P((struct uvm_object *, struct vm_page *,
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struct vm_page ***, int *, int,
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voff_t, voff_t));
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PAGER_INLINE struct vm_page *uvm_pageratop __P((vaddr_t));
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vaddr_t uvm_pagermapin __P((struct vm_page **, int,
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struct uvm_aiodesc **, int));
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void uvm_pagermapout __P((vaddr_t, int));
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struct vm_page **uvm_mk_pcluster __P((struct uvm_object *, struct vm_page **,
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int *, struct vm_page *, int,
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voff_t, voff_t));
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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 /* host <- device */
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#define UVMPAGER_MAPIN_WRITE 0x00 /* device -> host (pseudo flag) */
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#endif /* _KERNEL */
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#endif /* _UVM_UVM_PAGER_H_ */
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