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Kernel: Release page tables when no longer needed

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When unmapping regions, check if page tables can be freed.

This is a follow-up change for #3254.
This commit is contained in:
Tom 2020-08-27 21:29:17 -06:00 • committed by Andreas Kling
parent 88319b188e
commit 67dbb56444
5 changed files with 50 additions and 7 deletions
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2
Kernel/Arch/i386/CPU.h
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@ -140,6 +140,7 @@ public:
m_raw |= value & 0xfffff000;
}
bool is_null() const { return m_raw == 0; }
void clear() { m_raw = 0; }
u64 raw() const { return m_raw; }
@ -234,6 +235,7 @@ public:
bool is_execute_disabled() const { return raw() & NoExecute; }
void set_execute_disabled(bool b) { set_bit(NoExecute, b); }
bool is_null() const { return m_raw == 0; }
void clear() { m_raw = 0; }
void set_bit(u64 bit, bool value)