115 lines
2.2 KiB
C++
115 lines
2.2 KiB
C++
/*
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* \brief Platform-specific capability type
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* \author Norman Feske
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* \date 2009-10-02
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*/
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/*
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* Copyright (C) 2009-2013 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__NATIVE_CAPABILITY_H_
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#define _INCLUDE__BASE__NATIVE_CAPABILITY_H_
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/* Fiasco includes */
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namespace Fiasco {
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#include <l4/sys/types.h>
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}
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/* Genode includes */
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#include <base/cap_map.h>
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namespace Genode {
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/**
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* Native_capability in Fiasco.OC is just a reference to a Cap_index.
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*
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* As Cap_index objects cannot be copied around, but Native_capability
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* have to, we have to use this indirection.
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*/
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class Native_capability
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{
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public:
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typedef Fiasco::l4_cap_idx_t Dst;
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struct Raw
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{
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long local_name;
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};
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private:
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Cap_index* _idx;
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protected:
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inline void _inc()
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{
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if (_idx)
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_idx->inc();
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}
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inline void _dec()
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{
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if (_idx && !_idx->dec()) {
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cap_map()->remove(_idx);
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}
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}
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public:
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/**
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* Default constructor creates an invalid capability
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*/
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Native_capability() : _idx(0) { }
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/**
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* Construct capability manually
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*/
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Native_capability(Cap_index* idx)
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: _idx(idx) { _inc(); }
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Native_capability(const Native_capability &o)
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: _idx(o._idx) { _inc(); }
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~Native_capability() { _dec(); }
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/**
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* Return Cap_index object referenced by this object
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*/
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Cap_index* idx() const { return _idx; }
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/**
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* Overloaded comparision operator
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*/
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bool operator==(const Native_capability &o) const {
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return _idx == o._idx; }
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Native_capability& operator=(const Native_capability &o){
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if (this == &o)
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return *this;
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_dec();
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_idx = o._idx;
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_inc();
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return *this;
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}
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/*******************************************
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** Interface provided by all platforms **
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*******************************************/
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long local_name() const { return _idx ? _idx->id() : 0; }
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Dst dst() const { return _idx ? Dst(_idx->kcap()) : Dst(); }
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bool valid() const { return (_idx != 0) && _idx->valid(); }
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Raw raw() const { return { local_name() }; }
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};
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}
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#endif /* _INCLUDE__BASE__NATIVE_CAPABILITY_H_ */
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