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87dc4c3d2c
By moving the PhysicalPage classes out of the kernel heap into a static array, one for each physical page, we can avoid the added overhead and easily find them by indexing into an array. This also wraps the PhysicalPage into a PhysicalPageEntry, which allows us to re-use each slot with information where to find the next free page.
40 lines
1 KiB
C++
40 lines
1 KiB
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 supervisor, 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(supervisor, may_return_to_freelist));
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}
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PhysicalPage::PhysicalPage(bool supervisor, bool may_return_to_freelist)
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: m_may_return_to_freelist(may_return_to_freelist)
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, m_supervisor(supervisor)
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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::return_to_freelist() const
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{
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VERIFY((paddr().get() & ~PAGE_MASK) == 0);
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if (m_supervisor)
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MM.deallocate_supervisor_physical_page(*this);
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else
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MM.deallocate_user_physical_page(*this);
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}
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}
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