/*

 * Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

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 */

#ifndef SHARE_GC_Z_ZPHYSICALMEMORY_HPP

#define SHARE_GC_Z_ZPHYSICALMEMORY_HPP

#include "memory/allocation.hpp"

#include OS_CPU_HEADER(gc/z/zPhysicalMemoryBacking)

class ZPhysicalMemorySegment {

private:

  uintptr_t _start;

  uintptr_t _end;

public:

  ZPhysicalMemorySegment(uintptr_t start, size_t size);

  uintptr_t start() const;

  uintptr_t end() const;

  size_t size() const;

  void expand(size_t size);

  ZPhysicalMemorySegment split(size_t size);

};

class ZPhysicalMemory {

private:

  size_t                  _nsegments;

  ZPhysicalMemorySegment* _segments;

public:

  ZPhysicalMemory();

  ZPhysicalMemory(size_t size);

  ZPhysicalMemory(const ZPhysicalMemorySegment& segment);

  bool is_null() const;

  size_t size() const;

  size_t nsegments() const;

  ZPhysicalMemorySegment segment(size_t index) const;

  void add_segment(ZPhysicalMemorySegment segment);

  ZPhysicalMemory split(size_t size);

  void clear();

};

class ZPhysicalMemoryManager {

  friend class VMStructs;

private:

  ZPhysicalMemoryBacking _backing;

  const size_t           _max_capacity;

  size_t                 _current_max_capacity;

  size_t                 _capacity;

  size_t                 _used;

  void nmt_commit(ZPhysicalMemory pmem, uintptr_t offset);

  void nmt_uncommit(ZPhysicalMemory pmem, uintptr_t offset);

public:

  ZPhysicalMemoryManager(size_t max_capacity);

  bool is_initialized() const;

  size_t max_capacity() const;

  size_t current_max_capacity() const;

  size_t capacity() const;

  size_t unused_capacity() const;

  void try_ensure_unused_capacity(size_t size);

  ZPhysicalMemory alloc(size_t size);

  void free(ZPhysicalMemory pmem);

  void map(ZPhysicalMemory pmem, uintptr_t offset);

  void unmap(ZPhysicalMemory pmem, uintptr_t offset);

};

#endif // SHARE_GC_Z_ZPHYSICALMEMORY_HPP