139 lines
3.6 KiB
C++
139 lines
3.6 KiB
C++
// vim:set ft=cpp: -*- Mode: C++ -*-
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/**
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* \file
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* L4::Cap related definitions.
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*
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* \author Alexander Warg <alexander.warg@os.inf.tu-dresden.de>
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*
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*/
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/*
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* (c) 2008-2009,2015 Author(s)
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* economic rights: Technische Universität Dresden (Germany)
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*
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* This file is part of TUD:OS and distributed under the terms of the
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* GNU General Public License 2.
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* Please see the COPYING-GPL-2 file for details.
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*/
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#pragma once
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#include <l4/sys/consts.h>
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#include <l4/sys/types.h>
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#include <l4/sys/kobject>
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#include <l4/sys/task.h>
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namespace L4
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{
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/* Forward declarations for our kernel object classes. */
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class Task;
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class Thread;
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class Factory;
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class Irq;
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class Log;
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class Vm;
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class Kobject;
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/**
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* Disable copy of a class.
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*
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* \param _class Name of the class that shall not have value copy semantics.
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*
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* The typical use of this is:
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* ~~~
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* class Non_value
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* {
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* L4_DISABLE_COPY(Non_value)
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*
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* ...
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* }
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* ~~~
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*/
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#if __cplusplus >= 201103L
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# define L4_DISABLE_COPY(_class) \
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public: \
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_class(_class const &) = delete; \
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_class operator = (_class const &) = delete; \
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private:
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#else
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# define L4_DISABLE_COPY(_class) \
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private: \
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_class(_class const &); \
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_class operator = (_class const &);
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#endif
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#define L4_KOBJECT_DISABLE_COPY(_class) \
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protected: \
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_class(); \
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L4_DISABLE_COPY(_class)
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#define L4_KOBJECT(_class) L4_KOBJECT_DISABLE_COPY(_class)
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inline l4_msgtag_t
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Cap_base::validate(Cap<Task> task, l4_utcb_t *u) const throw()
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{ return l4_task_cap_valid_u(task.cap(), _c, u); }
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inline l4_msgtag_t
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Cap_base::validate(l4_utcb_t *u) const throw()
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{ return l4_task_cap_valid_u(L4_BASE_TASK_CAP, _c, u); }
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}; // namespace L4
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#include <l4/sys/meta>
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namespace L4 {
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/**
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* `dynamic_cast` for capabilities.
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*
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* \tparam T The target type of the capability.
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* \tparam F The source type (is usually implicitly set).
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* \param c The source capability that shall be casted.
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*
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* \retval Cap<T> Capability of target interface `T`.
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* \retval L4_INVALID_CAP `c` does not support the target interface `T` or the
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* L4::Meta interface.
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*
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* The use of this cast operator is similar to the `dynamic_cast<>()` for
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* C++ pointers. It also induces overhead, because it uses the meta interface
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* (L4::Meta) to do runtime type checking.
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*
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* Example code:
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*
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* L4::Cap<L4::Kobject> obj = ... ;
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* L4::Cap<L4::Icu> icu = L4::cap_dynamic_cast<L4::Icu>(obj);
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*
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*/
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template< typename T, typename F >
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inline
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Cap<T> cap_dynamic_cast(Cap<F> const &c) throw()
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{
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if (!c.is_valid())
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return Cap<T>::Invalid;
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Cap<Meta> mc = cap_reinterpret_cast<Meta>(c);
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Type_info const *m = kobject_typeid<T>();
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if (m->proto() && l4_error(mc->supports(m->proto())) > 0)
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return Cap<T>(c.cap());
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// FIXME: use generic checker
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#if 0
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if (l4_error(mc->supports(T::kobject_proto())) > 0)
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return Cap<T>(c.cap());
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#endif
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return Cap<T>::Invalid;
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}
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}
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