sys/uvm/uvm_device.h

   1 /*      $NetBSD: uvm_device.h,v 1.9.26.3 2004/09/21 13:39:24 skrll 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(void *, vm_prot_t, voff_t, vsize_t);
  73
  74 #endif /* _KERNEL */
  75
  76 #endif /* _UVM_UVM_DEVICE_H_ */