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uvm_device.h revision 1.13 
      1 /*	$NetBSD: uvm_device.h,v 1.13 2014/12/14 23:48:58 chs Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997 Charles D. Cranor and Washington University.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  *
     27  * from: Id: uvm_device.h,v 1.1.2.2 1997/10/03 17:39:44 chuck Exp
     28  */
     29 
     30 #ifndef _UVM_UVM_DEVICE_H_
     31 #define _UVM_UVM_DEVICE_H_
     32 
     33 /*
     34  * uvm_device.h
     35  *
     36  * device handle into the VM system.
     37  */
     38 
     39 /*
     40  * the uvm_device structure.   object is put at the top of the data structure.
     41  * this allows:
     42  *   (struct uvm_device *) == (struct uvm_object *)
     43  */
     44 
     45 struct uvm_device {
     46 	struct uvm_object u_obj;	/* the actual VM object */
     47 	int u_flags;			/* flags [LOCKED BY UDV_LOCK!] */
     48 	dev_t u_device;		/* our device */
     49 	LIST_ENTRY(uvm_device) u_list; /* list of device objects */
     50 };
     51 
     52 /*
     53  * u_flags values
     54  */
     55 
     56 #define UVM_DEVICE_HOLD		0x1	/* someone has a "hold" on it */
     57 #define UVM_DEVICE_WANTED	0x2	/* someone wants to put a "hold" on */
     58 
     59 #ifdef _KERNEL
     60 
     61 /*
     62  * prototypes
     63  */
     64 
     65 struct uvm_object *udv_attach(dev_t, vm_prot_t, voff_t, vsize_t);
     66 
     67 #endif /* _KERNEL */
     68 
     69 #endif /* _UVM_UVM_DEVICE_H_ */
     70