108 lines
3.9 KiB
C
108 lines
3.9 KiB
C
/*
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* Copyright (c) 1990 University of Utah.
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* Copyright (c) 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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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 the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)vm_pager.h 7.2 (Berkeley) 4/20/91
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* $Id: vm_pager.h,v 1.3 1993/05/20 03:59:43 cgd Exp $
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*/
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#ifndef _VM_VM_PAGER_H_
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#define _VM_VM_PAGER_H_
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/*
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* Pager routine interface definition.
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* For BSD we use a cleaner version of the internal pager interface.
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*/
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struct pager_struct {
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queue_head_t pg_list; /* links for list management */
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caddr_t pg_handle; /* external handle (vp, dev, fp) */
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int pg_type; /* type of pager */
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struct pagerops *pg_ops; /* pager operations */
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caddr_t pg_data; /* private pager data */
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};
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typedef struct pager_struct *vm_pager_t;
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/* pager types */
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#define PG_DFLT -1
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#define PG_SWAP 0
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#define PG_VNODE 1
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#define PG_DEVICE 2
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struct pagerops {
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void (*pgo_init)(); /* initialize pager */
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vm_pager_t (*pgo_alloc)(); /* allocate pager */
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void (*pgo_dealloc)(); /* disassociate */
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int (*pgo_getpage)(); /* get (read) page */
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int (*pgo_putpage)(); /* put (write) page */
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boolean_t (*pgo_haspage)(); /* does pager have page? */
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};
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/*
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* get/put return values
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* OK operation was successful
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* BAD specified data was out of the accepted range
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* FAIL specified data was in range, but doesn't exist
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* PEND operations was initiated but not completed
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*/
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#define VM_PAGER_OK 0
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#define VM_PAGER_BAD 1
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#define VM_PAGER_FAIL 2
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#define VM_PAGER_PEND 3
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#define VM_PAGER_ALLOC(h, s, p) (*(pg)->pg_ops->pgo_alloc)(h, s, p)
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#define VM_PAGER_DEALLOC(pg) (*(pg)->pg_ops->pgo_dealloc)(pg)
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#define VM_PAGER_GET(pg, m, s) (*(pg)->pg_ops->pgo_getpage)(pg, m, s)
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#define VM_PAGER_PUT(pg, m, s) (*(pg)->pg_ops->pgo_putpage)(pg, m, s)
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#define VM_PAGER_HASPAGE(pg, o) (*(pg)->pg_ops->pgo_haspage)(pg, o)
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#ifdef KERNEL
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vm_pager_t vm_pager_allocate();
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void vm_pager_deallocate();
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int vm_pager_get();
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int vm_pager_put();
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boolean_t vm_pager_has_page();
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vm_offset_t vm_pager_map_page();
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void vm_pager_unmap_page();
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vm_pager_t vm_pager_lookup();
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void vm_pager_sync();
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extern struct pagerops *dfltpagerops;
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#endif
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#endif /* !_VM_VM_PAGER_H_ */
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