Convenience helper for attached ROM dataspaces

In the line of the 'Attached_ram_dataspace' and
'Attached_io_mem_dataspace' classes, this new helper simplifies the
access to ROM dataspaces.
This commit is contained in:
Norman Feske 2012-01-09 21:44:36 +01:00
parent a6bac95fbd
commit 8495a5fc96

View File

@ -0,0 +1,78 @@
/*
* \brief ROM dataspace utility
* \author Norman Feske
* \date 2012-01-09
*/
/*
* Copyright (C) 2012 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_ROM_DATASPACE_H_
#define _INCLUDE__OS__ATTACHED_ROM_DATASPACE_H_
#include <rom_session/connection.h>
#include <dataspace/client.h>
#include <base/env.h>
namespace Genode {
class Attached_rom_dataspace
{
private:
Rom_connection _rom;
Rom_dataspace_capability _ds;
size_t _size;
void *_local_addr;
public:
/**
* Constructor
*
* \throw Rom_connection::Rom_session_failed
* \throw Rm_session::Attach_failed
*/
Attached_rom_dataspace(char const *name)
:
_rom(name),
_ds(_rom.dataspace()),
_size(Dataspace_client(_ds).size()),
_local_addr(env()->rm_session()->attach(_ds))
{ }
/**
* Destructor
*/
~Attached_rom_dataspace()
{
env()->rm_session()->detach(_local_addr);
}
/**
* Return capability of the used ROM dataspace
*/
Rom_dataspace_capability cap() const { return _ds; }
/**
* Request local address
*
* This is a template to avoid inconvenient casts at
* the caller. A newly allocated ROM 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; }
};
}
#endif /* _INCLUDE__OS__ATTACHED_ROM_DATASPACE_H_ */