mirror of
https://github.com/RGBCube/serenity
synced 2025-10-28 21:42:06 +00:00
d2b41010c5
We now can create a cacheable Region, so when map() is called, if a Region is cacheable then all the virtual memory space being allocated to it will be marked as not cache disabled. In addition to that, OS components can create a Region that will be mapped to a specific physical address by using the appropriate helper method.
41 lines
1.4 KiB
C++
41 lines
1.4 KiB
C++
#pragma once
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#include <AK/HashMap.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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#include <Kernel/VM/PhysicalPage.h>
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#include <Kernel/VM/RangeAllocator.h>
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class Process;
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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 NonnullRefPtr<PageDirectory> create_for_userspace(Process& process, const RangeAllocator* parent_range_allocator = nullptr)
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{
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return adopt(*new PageDirectory(process, parent_range_allocator));
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}
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static NonnullRefPtr<PageDirectory> create_at_fixed_address(PhysicalAddress paddr) { return adopt(*new PageDirectory(paddr)); }
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static RefPtr<PageDirectory> find_by_cr3(u32);
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~PageDirectory();
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u32 cr3() const { return m_directory_table->paddr().get(); }
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PageDirectoryPointerTable& table() { return *reinterpret_cast<PageDirectoryPointerTable*>(cr3()); }
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RangeAllocator& range_allocator() { return m_range_allocator; }
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Process* process() { return m_process; }
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const Process* process() const { return m_process; }
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private:
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PageDirectory(Process&, const RangeAllocator* parent_range_allocator);
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explicit PageDirectory(PhysicalAddress);
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Process* m_process { nullptr };
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RangeAllocator m_range_allocator;
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RefPtr<PhysicalPage> m_directory_table;
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RefPtr<PhysicalPage> m_directory_pages[4];
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HashMap<unsigned, RefPtr<PhysicalPage>> m_physical_pages;
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};
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