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bdfbe9f20e
The new Attached_dataspace complements the existing Attached_* utilities with a simple version that can be used with any kind of dataspaces. It may be even useful as a common base type for the other variants. For example, this patch simplifies Attached_rom_dataspace and removes the Terminal::Client::Io_buffer.
84 lines
1.6 KiB
C++
84 lines
1.6 KiB
C++
/*
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* \brief Dataspace utility
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* \author Norman Feske
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* \date 2014-01-10
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*/
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/*
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* Copyright (C) 2014 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _INCLUDE__OS__ATTACHED_DATASPACE_H_
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#define _INCLUDE__OS__ATTACHED_DATASPACE_H_
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#include <dataspace/client.h>
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#include <base/env.h>
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namespace Genode { class Attached_dataspace; }
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class Genode::Attached_dataspace : Noncopyable
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{
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public:
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/**
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* Exception type
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*/
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class Invalid_dataspace { };
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private:
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Dataspace_capability _ds;
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size_t const _size = { Dataspace_client(_ds).size() };
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void * const _local_addr = { env()->rm_session()->attach(_ds) };
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Dataspace_capability _check(Dataspace_capability ds)
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{
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if (ds.valid())
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return ds;
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throw Invalid_dataspace();
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}
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public:
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/**
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* Constructor
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*
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* \throw Rm_session::Attach_failed
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* \throw Invalid_dataspace
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*/
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Attached_dataspace(Dataspace_capability ds) : _ds(_check(ds)) { }
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/**
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* Destructor
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*/
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~Attached_dataspace() { env()->rm_session()->detach(_local_addr); }
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/**
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* Return capability of the used dataspace
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*/
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Dataspace_capability cap() const { return _ds; }
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/**
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* Request local address
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*
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* This is a template to avoid inconvenient casts at the caller.
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* A newly attached dataspace is untyped memory anyway.
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*/
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template <typename T>
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T *local_addr() { return static_cast<T *>(_local_addr); }
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/**
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* Return size
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*/
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size_t size() const { return _size; }
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};
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#endif /* _INCLUDE__OS__ATTACHED_DATASPACE_H_ */
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