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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
72 lines
2 KiB
C++
72 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 ErrorOr<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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