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MM: Allocate page tables from a separate set of physical pages.
The old approach only worked because of an overpermissive accident. There's now a concept of supervisor physical pages that can be allocated. They all sit in the low 4 MB of physical memory and are identity mapped, shared between all processes, and only ring 0 can access them.
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5 changed files with 65 additions and 105 deletions
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@ -88,6 +88,7 @@ public:
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bool operator>(const LinearAddress& other) const { return m_address > other.m_address; }
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bool operator<(const LinearAddress& other) const { return m_address < other.m_address; }
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bool operator==(const LinearAddress& other) const { return m_address == other.m_address; }
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bool operator!=(const LinearAddress& other) const { return m_address != other.m_address; }
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byte* asPtr() { return reinterpret_cast<byte*>(m_address); }
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const byte* asPtr() const { return reinterpret_cast<const byte*>(m_address); }
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