110 lines
2.4 KiB
C++
110 lines
2.4 KiB
C++
/*
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* \brief Utility to attach a dataspace to the local address space
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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__BASE__ATTACHED_DATASPACE_H_
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#define _INCLUDE__BASE__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 * _local_addr = nullptr;
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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(Region_map &rm, Dataspace_capability ds)
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: _ds(_check(ds)), _local_addr(rm.attach(_ds)) { }
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/**
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* Constructor
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*
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* \noapi
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* \deprecated Use the constructor with 'Region_map &' as first
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* argument instead
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*/
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Attached_dataspace(Dataspace_capability ds)
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: _ds(_check(ds)), _local_addr(env()->rm_session()->attach(_ds)) { }
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/**
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* Destructor
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*/
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~Attached_dataspace()
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{
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if (_local_addr)
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env()->rm_session()->detach(_local_addr);
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}
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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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* Forget dataspace, thereby skipping the detachment on destruction
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*
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* This method can be called if the the dataspace is known to be
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* physically destroyed, e.g., because the session where the dataspace
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* originated from was closed. In this case, core will already have
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* removed the memory mappings of the dataspace. So we have to omit the
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* detach operation in '~Attached_dataspace'.
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*/
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void invalidate() { _local_addr = nullptr; }
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};
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#endif /* _INCLUDE__BASE__ATTACHED_DATASPACE_H_ */
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