sys/uvm/uvm_device.h

   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_ */