/*
 * 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.
 */

#include <Kernel/VM/MemoryManager.h>
#include <Kernel/VM/VMObject.h>

namespace Kernel {

VMObject::VMObject(const VMObject& other)
    : m_physical_pages(other.m_physical_pages)
{
    MM.register_vmobject(*this);
}

VMObject::VMObject()
{
    MM.register_vmobject(*this);
}

VMObject::VMObject(size_t size)
{
    m_physical_pages.resize(ceil_div(size, static_cast<size_t>(PAGE_SIZE)));
    MM.register_vmobject(*this);
}

VMObject::~VMObject()
{
    {
        ScopedSpinLock lock(m_on_deleted_lock);
        for (auto& it : m_on_deleted)
            it->vmobject_deleted(*this);
        m_on_deleted.clear();
    }

    MM.unregister_vmobject(*this);
    VERIFY(m_regions_count.load(AK::MemoryOrder::memory_order_relaxed) == 0);
}

}