NetBSD/sys/vm/device_pager.h

79 lines
2.9 KiB
C

/*
* Copyright (c) 1990 University of Utah.
* Copyright (c) 1991 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*
* @(#)device_pager.h 7.1 (Berkeley) 12/5/90
*/
#ifndef _VM_DEVICE_PAGER_H_
#define _VM_DEVICE_PAGER_H_
/*
* Device pager private data.
*/
struct devpager {
queue_head_t devp_list; /* list of managed devices */
dev_t devp_dev; /* devno of device */
vm_page_t devp_pages; /* page structs for device */
int devp_npages; /* size of device in pages */
int devp_count; /* reference count */
vm_object_t devp_object; /* object representing this device */
};
typedef struct devpager *dev_pager_t;
#define DEV_PAGER_NULL ((dev_pager_t)0)
#ifdef KERNEL
void dev_pager_init();
vm_pager_t dev_pager_alloc();
void dev_pager_dealloc();
boolean_t dev_pager_getpage(), dev_pager_putpage();
boolean_t dev_pager_haspage();
struct pagerops devicepagerops = {
dev_pager_init,
dev_pager_alloc,
dev_pager_dealloc,
dev_pager_getpage,
dev_pager_putpage,
dev_pager_haspage
};
#endif
#endif /* !_VM_DEVICE_PAGER_H_ */