capability

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// vim:set ft=cpp: -*- Mode: C++ -*-
/*
 * (c) 2008-2009,2015 Author(s)
 *     economic rights: Technische Universität Dresden (Germany)
 *
 * This file is part of TUD:OS and distributed under the terms of the
 * GNU General Public License 2.
 * Please see the COPYING-GPL-2 file for details.
 *
 * As a special exception, you may use this file as part of a free software
 * library without restriction.  Specifically, if other files instantiate
 * templates or use macros or inline functions from this file, or you compile
 * this file and link it with other files to produce an executable, this
 * file does not by itself cause the resulting executable to be covered by
 * the GNU General Public License.  This exception does not however
 * invalidate any other reasons why the executable file might be covered by
 * the GNU General Public License.
 */
#pragma once
 
#include <l4/sys/consts.h>
#include <l4/sys/types.h>
#include <l4/sys/kobject>
#include <l4/sys/task.h>
 
namespace L4
{
 
/* Forward declarations for our kernel object classes. */
class Task;
class Thread;
class Factory;
class Irq;
class Log;
class Vm;
class Vcpu_context;
class Kobject;
 
#if __cplusplus >= 201103L
#  define L4_DISABLE_COPY(_class)                \
  public:                                        \
    _class(_class const &) = delete;             \
    _class operator = (_class const &) = delete; \
  private:
#else
#  define L4_DISABLE_COPY(_class)       \
  private:                              \
    _class(_class const &);             \
    _class operator = (_class const &);
#endif
 
 
#define L4_KOBJECT_DISABLE_COPY(_class) \
  protected:                            \
    _class();                           \
  L4_DISABLE_COPY(_class)
 
 
#define L4_KOBJECT(_class) L4_KOBJECT_DISABLE_COPY(_class)
 
inline l4_msgtag_t
Cap_base::validate(Cap<Task> task, l4_utcb_t *u) const noexcept
{
  return is_valid() ? l4_task_cap_valid_u(task.cap(), _c, u)
                    : l4_msgtag(0, 0, 0, 0);
}
 
inline l4_msgtag_t
Cap_base::validate(l4_utcb_t *u) const noexcept
{
  return is_valid() ? l4_task_cap_valid_u(L4_BASE_TASK_CAP, _c, u)
                    : l4_msgtag(0, 0, 0, 0);
}
 
}; // namespace L4
 
#include <l4/sys/meta>
 
namespace L4 {
 
template< typename T, typename F >
inline
Cap<T> cap_dynamic_cast(Cap<F> const &c) noexcept
{
  if (!c.is_valid())
    return Cap<T>::Invalid;
 
  Cap<Meta> mc = cap_reinterpret_cast<Meta>(c);
  Type_info const *m = kobject_typeid<T>();
  if (m->proto() && l4_error(mc->supports(m->proto())) > 0)
    return Cap<T>(c.cap());
 
  // FIXME: use generic checker
#if 0
  if (l4_error(mc->supports(T::kobject_proto())) > 0)
    return Cap<T>(c.cap());
#endif
 
  return Cap<T>::Invalid;
}
 
}