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a6a439243f
This step would ideally not have been necessary (increases amount of refactoring and templates necessary, which in turn increases build times), but it gives us a couple of nice properties: - SpinlockProtected inside Singleton (a very common combination) can now obtain any lock rank just via the template parameter. It was not previously possible to do this with SingletonInstanceCreator magic. - SpinlockProtected's lock rank is now mandatory; this is the majority of cases and allows us to see where we're still missing proper ranks. - The type already informs us what lock rank a lock has, which aids code readability and (possibly, if gdb cooperates) lock mismatch debugging. - The rank of a lock can no longer be dynamic, which is not something we wanted in the first place (or made use of). Locks randomly changing their rank sounds like a disaster waiting to happen. - In some places, we might be able to statically check that locks are taken in the right order (with the right lock rank checking implementation) as rank information is fully statically known. This refactoring even more exposes the fact that Mutex has no lock rank capabilites, which is not fixed here.
82 lines
2.1 KiB
C++
82 lines
2.1 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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#pragma once
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#include <AK/AtomicRefCounted.h>
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#include <AK/Badge.h>
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#include <AK/HashMap.h>
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#include <AK/IntrusiveRedBlackTree.h>
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#include <AK/RefPtr.h>
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#include <Kernel/Forward.h>
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#include <Kernel/Locking/Spinlock.h>
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#include <Kernel/Memory/PhysicalPage.h>
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namespace Kernel::Memory {
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class PageDirectory final : public AtomicRefCounted<PageDirectory> {
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friend class MemoryManager;
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public:
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static ErrorOr<NonnullLockRefPtr<PageDirectory>> try_create_for_userspace();
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static NonnullLockRefPtr<PageDirectory> must_create_kernel_page_directory();
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static LockRefPtr<PageDirectory> find_current();
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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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bool is_cr3_initialized() const
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{
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#if ARCH(X86_64)
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return m_pml4t;
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#else
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return m_directory_table;
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#endif
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}
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AddressSpace* address_space() { return m_space; }
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AddressSpace const* 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<LockRank::None>& 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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static void register_page_directory(PageDirectory* directory);
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static void deregister_page_directory(PageDirectory* directory);
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AddressSpace* m_space { nullptr };
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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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RecursiveSpinlock<LockRank::None> m_lock {};
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};
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void activate_kernel_page_directory(PageDirectory const& pgd);
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void activate_page_directory(PageDirectory const& pgd, Thread* current_thread);
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}
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