root / lab4 / .minix-src / include / uvm / uvm_device.h @ 13
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/* $NetBSD: uvm_device.h,v 1.13 2014/12/14 23:48:58 chs Exp $ */
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/*
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* Copyright (c) 1997 Charles D. Cranor and Washington University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* from: Id: uvm_device.h,v 1.1.2.2 1997/10/03 17:39:44 chuck Exp
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*/
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#ifndef _UVM_UVM_DEVICE_H_
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#define _UVM_UVM_DEVICE_H_
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/*
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* uvm_device.h
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*
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* device handle into the VM system.
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*/
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/*
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* the uvm_device structure. object is put at the top of the data structure.
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* this allows:
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* (struct uvm_device *) == (struct uvm_object *)
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*/
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struct uvm_device {
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struct uvm_object u_obj; /* the actual VM object */ |
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int u_flags; /* flags [LOCKED BY UDV_LOCK!] */ |
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dev_t u_device; /* our device */
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LIST_ENTRY(uvm_device) u_list; /* list of device objects */
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}; |
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/*
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* u_flags values
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*/
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#define UVM_DEVICE_HOLD 0x1 /* someone has a "hold" on it */ |
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#define UVM_DEVICE_WANTED 0x2 /* someone wants to put a "hold" on */ |
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#ifdef _KERNEL
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/*
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* prototypes
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*/
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struct uvm_object *udv_attach(dev_t, vm_prot_t, voff_t, vsize_t);
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#endif /* _KERNEL */ |
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#endif /* _UVM_UVM_DEVICE_H_ */ |