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SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
62 lines
1.4 KiB
C++
62 lines
1.4 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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#pragma once
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#include <AK/NonnullRefPtr.h>
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#include <Kernel/Arch/x86/CPU.h>
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#include <Kernel/Assertions.h>
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#include <Kernel/Heap/SlabAllocator.h>
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#include <Kernel/PhysicalAddress.h>
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namespace Kernel {
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class PhysicalPage {
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friend class MemoryManager;
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friend class PageDirectory;
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friend class VMObject;
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MAKE_SLAB_ALLOCATED(PhysicalPage);
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AK_MAKE_NONMOVABLE(PhysicalPage);
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public:
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PhysicalAddress paddr() const { return m_paddr; }
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void ref()
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{
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m_ref_count.fetch_add(1, AK::memory_order_acq_rel);
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}
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void unref()
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{
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if (m_ref_count.fetch_sub(1, AK::memory_order_acq_rel) == 1) {
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if (m_may_return_to_freelist)
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return_to_freelist();
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delete this;
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}
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}
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static NonnullRefPtr<PhysicalPage> create(PhysicalAddress, bool supervisor, bool may_return_to_freelist = true);
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u32 ref_count() const { return m_ref_count.load(AK::memory_order_consume); }
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bool is_shared_zero_page() const;
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bool is_lazy_committed_page() const;
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private:
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PhysicalPage(PhysicalAddress paddr, bool supervisor, bool may_return_to_freelist = true);
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~PhysicalPage() = default;
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void return_to_freelist() const;
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Atomic<u32> m_ref_count { 1 };
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bool m_may_return_to_freelist { true };
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bool m_supervisor { false };
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PhysicalAddress m_paddr;
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};
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}
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