80 lines
2.9 KiB
C
80 lines
2.9 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: @(#)device_pager.h 7.1 (Berkeley) 12/5/90
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* $Id: device_pager.h,v 1.3 1993/05/20 03:59:09 cgd Exp $
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*/
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#ifndef _VM_DEVICE_PAGER_H_
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#define _VM_DEVICE_PAGER_H_
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/*
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* Device pager private data.
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*/
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struct devpager {
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queue_head_t devp_list; /* list of managed devices */
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dev_t devp_dev; /* devno of device */
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vm_page_t devp_pages; /* page structs for device */
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int devp_npages; /* size of device in pages */
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int devp_count; /* reference count */
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vm_object_t devp_object; /* object representing this device */
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};
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typedef struct devpager *dev_pager_t;
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#define DEV_PAGER_NULL ((dev_pager_t)0)
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#ifdef KERNEL
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void dev_pager_init();
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vm_pager_t dev_pager_alloc();
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void dev_pager_dealloc();
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boolean_t dev_pager_getpage(), dev_pager_putpage();
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boolean_t dev_pager_haspage();
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struct pagerops devicepagerops = {
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dev_pager_init,
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dev_pager_alloc,
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dev_pager_dealloc,
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dev_pager_getpage,
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dev_pager_putpage,
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dev_pager_haspage
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};
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#endif
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#endif /* !_VM_DEVICE_PAGER_H_ */
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