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71 lines
2 KiB
C++
71 lines
2 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/HashMap.h>
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#include <AK/IntrusiveRedBlackTree.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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#include <Kernel/Forward.h>
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#include <Kernel/Memory/PhysicalPage.h>
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#include <Kernel/Memory/VirtualRangeAllocator.h>
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namespace Kernel::Memory {
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class PageDirectory : public RefCounted<PageDirectory> {
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friend class MemoryManager;
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public:
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static KResultOr<NonnullRefPtr<PageDirectory>> try_create_for_userspace(VirtualRangeAllocator const* parent_range_allocator = nullptr);
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static NonnullRefPtr<PageDirectory> must_create_kernel_page_directory();
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static RefPtr<PageDirectory> find_by_cr3(FlatPtr);
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~PageDirectory();
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void allocate_kernel_directory();
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FlatPtr cr3() const
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{
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#if ARCH(X86_64)
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return m_pml4t->paddr().get();
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#else
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return m_directory_table->paddr().get();
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#endif
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}
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VirtualRangeAllocator& range_allocator() { return m_range_allocator; }
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VirtualRangeAllocator const& range_allocator() const { return m_range_allocator; }
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AddressSpace* address_space() { return m_space; }
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const AddressSpace* address_space() const { return m_space; }
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void set_space(Badge<AddressSpace>, AddressSpace& space) { m_space = &space; }
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RecursiveSpinlock& get_lock() { return m_lock; }
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// This has to be public to let the global singleton access the member pointer
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IntrusiveRedBlackTreeNode<FlatPtr, PageDirectory, RawPtr<PageDirectory>> m_tree_node;
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private:
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PageDirectory();
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AddressSpace* m_space { nullptr };
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VirtualRangeAllocator m_range_allocator;
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#if ARCH(X86_64)
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RefPtr<PhysicalPage> m_pml4t;
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#endif
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RefPtr<PhysicalPage> m_directory_table;
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#if ARCH(X86_64)
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RefPtr<PhysicalPage> m_directory_pages[512];
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#else
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RefPtr<PhysicalPage> m_directory_pages[4];
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#endif
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HashMap<FlatPtr, NonnullRefPtr<PhysicalPage>> m_page_tables;
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RecursiveSpinlock m_lock;
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};
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}
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