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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.
*/
#include <Kernel/VM/MemoryManager.h>
#include <Kernel/VM/PhysicalPage.h>
#include <Kernel/VM/PurgeableVMObject.h>
namespace Kernel {
NonnullRefPtr<PurgeableVMObject> PurgeableVMObject::create_with_size(size_t size)
{
return adopt(*new PurgeableVMObject(size));
}
PurgeableVMObject::PurgeableVMObject(size_t size)
: AnonymousVMObject(size)
{
}
PurgeableVMObject::PurgeableVMObject(const PurgeableVMObject& other)
: AnonymousVMObject(other)
{
}
PurgeableVMObject::~PurgeableVMObject()
{
}
NonnullRefPtr<VMObject> PurgeableVMObject::clone()
{
return adopt(*new PurgeableVMObject(*this));
}
int PurgeableVMObject::purge()
{
LOCKER(m_paging_lock);
return purge_impl();
}
int PurgeableVMObject::purge_with_interrupts_disabled(Badge<MemoryManager>)
{
ASSERT_INTERRUPTS_DISABLED();
if (m_paging_lock.is_locked())
return 0;
return purge_impl();
}
int PurgeableVMObject::purge_impl()
{
if (!m_volatile)
return 0;
int purged_page_count = 0;
for (size_t i = 0; i < m_physical_pages.size(); ++i) {
if (m_physical_pages[i])
++purged_page_count;
m_physical_pages[i] = MM.shared_zero_page();
}
m_was_purged = true;
for_each_region([&](auto& region) {
region.remap();
});
return purged_page_count;
}
}
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