virtmem.h

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// See the end of this file for license information.

#ifndef TORSION_VIRTMEM_H
#define TORSION_VIRTMEM_H

#include "asm.h"
#include "slaballoc.h"
#include "physmem.h"
#include "pagealloc.h"

class Virtual_memory;
extern Virtual_memory* virtual_mem;


class Virtual_memory {
protected:
  static const unsigned MAX_PAGE_SPAN_ALIGNMENT = 16;
  Slab_allocator allocators[PAGE_ALIGNMENT];
  bool enabled;       

public:
  Page_allocator virtual_pages;   

  static Virtual_memory*
  create(unsigned& last_available_address, bool map_memory = false);

  void
  init(unsigned& last_available_address);

  void*
  alloc(Size request_size);

  void*
  resize(void* memory, Size new_size);

  void
  free(void* memory);
  
  inline void
  enable() {
    enabled = true;
  }

  inline bool
  is_enabled() {
    return enabled;
  }

  inline bool
  manages(void* virtual_page) {
    if (enabled && virtual_pages.manages(virtual_page))
      return true;
    return false;
  }

  void
  print();
};

void* operator
new(Size request_size);

void operator
delete(void* memory);

#endif

/* Torsion Operating System, Copyright (C) 2000-2004 Dan Helfman
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details (in the COPYING file).
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

---

Torsion Operating System, Copyright (C) 2000-2004 Dan Helfman