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uvm_device.h revision 1.1 
      1 /*	$Id: uvm_device.h,v 1.1 1998/02/05 06:25:10 mrg Exp $	*/
      2 
      3 /*
      4  * XXXCDC: "ROUGH DRAFT" QUALITY UVM PRE-RELEASE FILE!
      5  *	   >>>USE AT YOUR OWN RISK, WORK IS NOT FINISHED<<<
      6  */
      7 /*
      8  *
      9  * Copyright (c) 1997 Charles D. Cranor and Washington University.
     10  * All rights reserved.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. All advertising materials mentioning features or use of this software
     21  *    must display the following acknowledgement:
     22  *      This product includes software developed by Charles D. Cranor and
     23  *      Washington University.
     24  * 4. The name of the author may not be used to endorse or promote products
     25  *    derived from this software without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     28  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     29  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     30  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     31  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     32  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     33  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     34  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     35  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     36  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /*
     40  * uvm_device.h
     41  *
     42  * device handle into the VM system.
     43  */
     44 
     45 #ifndef UVM_UVM_DEVICE_H
     46 #define UVM_UVM_DEVICE_H
     47 
     48 /*
     49  * the uvm_device structure.   object is put at the top of the data structure.
     50  * this allows:
     51  *   (struct uvm_device *) == (struct uvm_object *)
     52  */
     53 
     54 struct uvm_device {
     55   struct uvm_object u_obj;	/* the actual VM object */
     56   int u_flags;			/* flags [LOCKED BY UDV_LOCK!] */
     57   dev_t u_device;		/* our device */
     58   LIST_ENTRY(uvm_device) u_list; /* list of device objects */
     59 };
     60 
     61 /*
     62  * u_flags values
     63  */
     64 
     65 #define UVM_DEVICE_HOLD		0x1	/* someone has a "hold" on it */
     66 #define UVM_DEVICE_WANTED	0x2	/* someone wants to put a "hold" on */
     67 
     68 /*
     69  * prototypes
     70  */
     71 
     72 struct uvm_object *udv_attach __P((void *, vm_prot_t));
     73 
     74 #endif UVM_UVM_DEVICE_H
     75