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uvm_device.h revision 1.8 
      1 /*	$NetBSD: uvm_device.h,v 1.8 1999/06/21 17:25:11 thorpej Exp $	*/
      2 
      3 /*
      4  *
      5  * Copyright (c) 1997 Charles D. Cranor and Washington University.
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *      This product includes software developed by Charles D. Cranor and
     19  *      Washington University.
     20  * 4. The name of the author may not be used to endorse or promote products
     21  *    derived from this software without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     33  *
     34  * from: Id: uvm_device.h,v 1.1.2.2 1997/10/03 17:39:44 chuck Exp
     35  */
     36 
     37 #ifndef _UVM_UVM_DEVICE_H_
     38 #define _UVM_UVM_DEVICE_H_
     39 
     40 /*
     41  * uvm_device.h
     42  *
     43  * device handle into the VM system.
     44  */
     45 
     46 /*
     47  * the uvm_device structure.   object is put at the top of the data structure.
     48  * this allows:
     49  *   (struct uvm_device *) == (struct uvm_object *)
     50  */
     51 
     52 struct uvm_device {
     53 	struct uvm_object u_obj;	/* the actual VM object */
     54 	int u_flags;			/* flags [LOCKED BY UDV_LOCK!] */
     55 	dev_t u_device;		/* our device */
     56 	LIST_ENTRY(uvm_device) u_list; /* list of device objects */
     57 };
     58 
     59 /*
     60  * u_flags values
     61  */
     62 
     63 #define UVM_DEVICE_HOLD		0x1	/* someone has a "hold" on it */
     64 #define UVM_DEVICE_WANTED	0x2	/* someone wants to put a "hold" on */
     65 
     66 #ifdef _KERNEL
     67 
     68 /*
     69  * prototypes
     70  */
     71 
     72 struct uvm_object *udv_attach __P((void *, vm_prot_t, vaddr_t, vsize_t));
     73 
     74 #endif /* _KERNEL */
     75 
     76 #endif /* _UVM_UVM_DEVICE_H_ */
     77