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Kernel: Tidy up the lowest part of the address space
After MemoryManager initialization, we now only leave the lowest 1MB of memory identity-mapped. The very first (null) page is not present. All other pages are RW but not X. Supervisor only.
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2 changed files with 38 additions and 8 deletions
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@ -122,6 +122,7 @@ private:
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void detect_cpu_features();
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void initialize_paging();
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void setup_low_1mb();
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void parse_memory_map();
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void flush_entire_tlb();
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void flush_tlb(VirtualAddress);
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@ -147,7 +148,7 @@ private:
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PageTableEntry& ensure_pte(PageDirectory&, VirtualAddress);
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RefPtr<PageDirectory> m_kernel_page_directory;
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PageTableEntry* m_low_page_tables[4] { nullptr };
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RefPtr<PhysicalPage> m_low_page_table;
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VirtualAddress m_quickmap_addr;
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