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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/FixedArray.h>
#include <AK/InlineLinkedList.h>
#include <AK/RefCounted.h>
#include <AK/RefPtr.h>
#include <AK/Weakable.h>
#include <Kernel/Lock.h>
class Inode;
class PhysicalPage;
class VMObject : public RefCounted<VMObject>
, public Weakable<VMObject>
, public InlineLinkedListNode<VMObject> {
friend class MemoryManager;
friend class Region;
public:
virtual ~VMObject();
virtual NonnullRefPtr<VMObject> clone() = 0;
virtual bool is_anonymous() const { return false; }
virtual bool is_purgeable() const { return false; }
virtual bool is_inode() const { return false; }
size_t page_count() const { return m_physical_pages.size(); }
const FixedArray<RefPtr<PhysicalPage>>& physical_pages() const { return m_physical_pages; }
FixedArray<RefPtr<PhysicalPage>>& physical_pages() { return m_physical_pages; }
size_t size() const { return m_physical_pages.size() * PAGE_SIZE; }
// For InlineLinkedListNode
VMObject* m_next { nullptr };
VMObject* m_prev { nullptr };
protected:
explicit VMObject(size_t);
explicit VMObject(const VMObject&);
template<typename Callback>
void for_each_region(Callback);
FixedArray<RefPtr<PhysicalPage>> m_physical_pages;
Lock m_paging_lock { "VMObject" };
private:
VMObject& operator=(const VMObject&) = delete;
VMObject& operator=(VMObject&&) = delete;
VMObject(VMObject&&) = delete;
};
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