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Kernel: Add mechanism to identity map the lowest 2MB

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Tom 2020-06-01 22:55:09 -06:00 • committed by Andreas Kling
parent 19190267a6
commit 841364b609
7 changed files with 40 additions and 12 deletions
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6
Kernel/VM/Region.h
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@ -95,6 +95,9 @@ public:
bool is_user_accessible() const { return m_user_accessible; }
void set_user_accessible(bool b) { m_user_accessible = b; }
bool is_kernel() const { return m_kernel || vaddr().get() >= 0xc0000000; }
void set_kernel(bool kernel) { m_kernel = kernel; }
PageFaultResponse handle_fault(const PageFault&);
NonnullOwnPtr<Region> clone();
@ -178,7 +181,7 @@ public:
Region* m_prev { nullptr };
// NOTE: These are public so we can make<> them.
Region(const Range&, NonnullRefPtr<VMObject>, size_t offset_in_vmobject, const String&, u8 access, bool cacheable);
Region(const Range&, NonnullRefPtr<VMObject>, size_t offset_in_vmobject, const String&, u8 access, bool cacheable, bool kernel);
void set_inherit_mode(InheritMode inherit_mode) { m_inherit_mode = inherit_mode; }
@ -211,6 +214,7 @@ private:
bool m_cacheable : 1 { false };
bool m_stack : 1 { false };
bool m_mmap : 1 { false };
bool m_kernel : 1 { false };
mutable OwnPtr<Bitmap> m_cow_map;
};