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Kernel: Move PhysicalPage classes out of the heap into an array
By moving the PhysicalPage classes out of the kernel heap into a static array, one for each physical page, we can avoid the added overhead and easily find them by indexing into an array. This also wraps the PhysicalPage into a PhysicalPageEntry, which allows us to re-use each slot with information where to find the next free page.
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11 changed files with 285 additions and 43 deletions
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@ -31,6 +31,8 @@ public:
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unsigned free() const { return m_pages - m_used + m_recently_returned.size(); }
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bool contains(const PhysicalPage& page) const { return page.paddr() >= m_lower && page.paddr() <= m_upper; }
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NonnullRefPtr<PhysicalRegion> take_pages_from_beginning(unsigned);
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RefPtr<PhysicalPage> take_free_page(bool supervisor);
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NonnullRefPtrVector<PhysicalPage> take_contiguous_free_pages(size_t count, bool supervisor, size_t physical_alignment = PAGE_SIZE);
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void return_page(const PhysicalPage& page);
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