root / lab4 / .minix-src / include / uvm / uvm_device.h @ 14
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| 1 | 13 | up20180614 | /* $NetBSD: uvm_device.h,v 1.13 2014/12/14 23:48:58 chs Exp $ */
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| 2 | |||
| 3 | /*
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| 4 | * Copyright (c) 1997 Charles D. Cranor and Washington University.
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| 5 | * All rights reserved.
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| 6 | *
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| 7 | * Redistribution and use in source and binary forms, with or without
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| 8 | * modification, are permitted provided that the following conditions
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| 9 | * are met:
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * 2. Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | *
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| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 19 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 21 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 22 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 23 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 25 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 26 | *
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| 27 | * from: Id: uvm_device.h,v 1.1.2.2 1997/10/03 17:39:44 chuck Exp
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| 28 | */
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| 29 | |||
| 30 | #ifndef _UVM_UVM_DEVICE_H_
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| 31 | #define _UVM_UVM_DEVICE_H_
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| 32 | |||
| 33 | /*
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| 34 | * uvm_device.h
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| 35 | *
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| 36 | * device handle into the VM system.
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| 37 | */
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| 38 | |||
| 39 | /*
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| 40 | * the uvm_device structure. object is put at the top of the data structure.
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| 41 | * this allows:
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| 42 | * (struct uvm_device *) == (struct uvm_object *)
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| 43 | */
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| 44 | |||
| 45 | struct uvm_device {
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| 46 | struct uvm_object u_obj; /* the actual VM object */ |
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| 47 | int u_flags; /* flags [LOCKED BY UDV_LOCK!] */ |
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| 48 | dev_t u_device; /* our device */
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| 49 | LIST_ENTRY(uvm_device) u_list; /* list of device objects */
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| 50 | }; |
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| 51 | |||
| 52 | /*
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| 53 | * u_flags values
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| 54 | */
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| 55 | |||
| 56 | #define UVM_DEVICE_HOLD 0x1 /* someone has a "hold" on it */ |
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| 57 | #define UVM_DEVICE_WANTED 0x2 /* someone wants to put a "hold" on */ |
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| 58 | |||
| 59 | #ifdef _KERNEL
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| 60 | |||
| 61 | /*
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| 62 | * prototypes
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| 63 | */
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| 64 | |||
| 65 | struct uvm_object *udv_attach(dev_t, vm_prot_t, voff_t, vsize_t);
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| 66 | |||
| 67 | #endif /* _KERNEL */ |
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| 68 | |||
| 69 | #endif /* _UVM_UVM_DEVICE_H_ */ |