-
Notifications
You must be signed in to change notification settings - Fork 246
/
attached_dataspace.h
98 lines (77 loc) · 2.08 KB
/
attached_dataspace.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
/*
* \brief Dataspace utility
* \author Norman Feske
* \date 2014-01-10
*/
/*
* Copyright (C) 2014 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__OS__ATTACHED_DATASPACE_H_
#define _INCLUDE__OS__ATTACHED_DATASPACE_H_
#include <dataspace/client.h>
#include <base/env.h>
namespace Genode { class Attached_dataspace; }
class Genode::Attached_dataspace : Noncopyable
{
public:
/**
* Exception type
*/
class Invalid_dataspace { };
private:
Dataspace_capability _ds;
size_t const _size = { Dataspace_client(_ds).size() };
void *_local_addr = { env()->rm_session()->attach(_ds) };
Dataspace_capability _check(Dataspace_capability ds)
{
if (ds.valid())
return ds;
throw Invalid_dataspace();
}
public:
/**
* Constructor
*
* \throw Rm_session::Attach_failed
* \throw Invalid_dataspace
*/
Attached_dataspace(Dataspace_capability ds) : _ds(_check(ds)) { }
/**
* Destructor
*/
~Attached_dataspace()
{
if (_local_addr)
env()->rm_session()->detach(_local_addr);
}
/**
* Return capability of the used dataspace
*/
Dataspace_capability cap() const { return _ds; }
/**
* Request local address
*
* This is a template to avoid inconvenient casts at the caller.
* A newly attached dataspace is untyped memory anyway.
*/
template <typename T>
T *local_addr() { return static_cast<T *>(_local_addr); }
/**
* Return size
*/
size_t size() const { return _size; }
/**
* Forget dataspace, thereby skipping the detachment on destruction
*
* This method can be called if the the dataspace is known to be
* physically destroyed, e.g., because the session where the dataspace
* originated from was closed. In this case, core will already have
* removed the memory mappings of the dataspace. So we have to omit the
* detach operation in '~Attached_dataspace'.
*/
void invalidate() { _local_addr = nullptr; }
};
#endif /* _INCLUDE__OS__ATTACHED_DATASPACE_H_ */