/*
* 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.
*
* 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_device.h,v 1.1.2.2 1997/10/03 17:39:44 chuck Exp
*/
/*
* uvm_device.h
*
* device handle into the VM system.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <uvm/uvm_object.h>
/*
* the uvm_device structure. object is put at the top of the data structure.
* this allows:
* (struct uvm_device *) == (struct uvm_object *)
*/
struct uvm_device {
struct uvm_object u_obj; /* the actual VM object */
int u_flags; /* flags [LOCKED BY UDV_LOCK!] */
dev_t u_device; /* our device */
LIST_ENTRY(uvm_device) u_list; /* list of device objects */
};
/*
* u_flags values
*/
#define UVM_DEVICE_HOLD 0x1 /* someone has a "hold" on it */
#define UVM_DEVICE_WANTED 0x2 /* someone wants to put a "hold" on */
