FreeBSD/Linux Kernel Cross Reference
sys/uvm/uvm_device.h

     /*      $OpenBSD: uvm_device.h,v 1.11 2014/07/11 16:35:40 jsg Exp $     */
     /*      $NetBSD: uvm_device.h,v 1.9 2000/05/28 10:21:55 drochner Exp $  */
     
     /*
      * Copyright (c) 1997 Charles D. Cranor and Washington University.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * from: Id: uvm_device.h,v 1.1.2.2 1997/10/03 17:39:44 chuck Exp
     */
    
    #ifndef _UVM_UVM_DEVICE_H_
    #define _UVM_UVM_DEVICE_H_
    
    /*
     * uvm_device.h
     *
     * device handle into the VM system.
     */
    
    /*
     * the uvm_device structure.   object is put at the top of the data structure.
     * this allows:
     *   (struct uvm_device *) == (struct uvm_object *)
     */
    
    struct uvm_device {
            struct uvm_object u_obj;        /* the actual VM object */
            int u_flags;                    /* flags [LOCKED BY UDV_LOCK!] */
            dev_t u_device;         /* our device */
            LIST_ENTRY(uvm_device) u_list; /* list of device objects */
    };
    
    /*
     * u_flags values
     */
    
    #define UVM_DEVICE_HOLD         0x1     /* someone has a "hold" on it */
    #define UVM_DEVICE_WANTED       0x2     /* someone wants to put a "hold" on */
    
    #ifdef _KERNEL
    
    /*
     * prototypes
     */
    
    struct uvm_object *udv_attach(dev_t, vm_prot_t, voff_t, vsize_t);
    struct uvm_object *udv_attach_drm(dev_t, vm_prot_t, voff_t, vsize_t);
    
    #endif /* _KERNEL */
    
    #endif /* _UVM_UVM_DEVICE_H_ */

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