/*
 * (c) 2008-2010 Alexander Warg <warg@os.inf.tu-dresden.de>
 *     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.
 */
#pragma once

#include <l4/re/util/cap_alloc>
#include <l4/sys/capability>
#include <l4/re/dataspace>
#include <l4/sys/types.h>
#include <l4/libloader/remote_mem>
#include <l4/re/rm>
#include <l4/re/error_helper>

class Stack_base
{
protected:
  L4Re::Util::Ref_cap<L4Re::Dataspace>::Cap _stack_ds;
  L4Re::Rm::Unique_region<char*> _vma;

  l4_addr_t _last_checked;

  Stack_base() : _last_checked(0) {}

  void check_access(char *addr, size_t sz)
  {
    if (_last_checked != l4_trunc_page(l4_addr_t(addr)))
      {
	l4_addr_t offs = l4_trunc_page(addr - _vma.get());
	l4_addr_t end = l4_round_page(addr + sz - _vma.get());
	L4Re::chksys(_stack_ds->allocate(offs, end - offs));
	_last_checked = l4_trunc_page(l4_addr_t(addr));
      }

  }
};

class Stack : public Ldr::Remote_stack<Stack_base>
{
public:
  explicit Stack() : Ldr::Remote_stack<Stack_base>(0) {}
  void set_stack(L4Re::Util::Ref_cap<L4Re::Dataspace>::Cap const &ds, unsigned size);
};