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Give each task its own page directory.
This isn't finished but I'll commit as I go. We need to get to where context switching only needs to change CR3 and everything's ready to go. My basic idea is: - The first 4 kB is off-limits. This catches null dereferences. - Up to the 4 MB mark is identity-mapped and kernel-only. - The rest is available to everyone! While the first 4 MB is only available to the kernel, it's still mapped in every process, for convenience when entering the kernel.
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7 changed files with 47 additions and 15 deletions
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@ -65,6 +65,8 @@ public:
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void registerZone(Zone&);
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void unregisterZone(Zone&);
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void populatePageDirectory(Task&);
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private:
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MemoryManager();
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~MemoryManager();
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@ -158,7 +160,7 @@ private:
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dword* m_pte;
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};
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PageTableEntry ensurePTE(LinearAddress);
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PageTableEntry ensurePTE(dword* pageDirectory, LinearAddress);
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dword* m_pageDirectory;
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dword* m_pageTableZero;
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