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c2792212f4
Instead of each PhysicalPage knowing whether it comes from the supervisor pages or from the user pages, we can just check in both sets when freeing a page. It's just a handful of pointer range checks, nothing expensive.
40 lines
1,017 B
C++
40 lines
1,017 B
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Heap/kmalloc.h>
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#include <Kernel/VM/MemoryManager.h>
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#include <Kernel/VM/PhysicalPage.h>
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namespace Kernel {
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NonnullRefPtr<PhysicalPage> PhysicalPage::create(PhysicalAddress paddr, bool may_return_to_freelist)
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{
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auto& physical_page_entry = MM.get_physical_page_entry(paddr);
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return adopt_ref(*new (&physical_page_entry.physical_page) PhysicalPage(may_return_to_freelist));
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}
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PhysicalPage::PhysicalPage(bool may_return_to_freelist)
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: m_may_return_to_freelist(may_return_to_freelist)
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{
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}
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PhysicalAddress PhysicalPage::paddr() const
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{
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return MM.get_physical_address(*this);
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}
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void PhysicalPage::free_this()
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{
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if (m_may_return_to_freelist) {
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auto paddr = MM.get_physical_address(*this);
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this->~PhysicalPage(); // delete in place
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MM.deallocate_physical_page(paddr);
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} else {
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this->~PhysicalPage(); // delete in place
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}
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}
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}
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