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Kernel: Support partial munmap()

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You can now munmap() a part of a region. The kernel will then create
one or two new regions around the "hole" and re-map them using the same
physical pages as before.

This goes towards fixing #175, but not all the way since we don't yet
do munmap() across multiple mappings.
This commit is contained in:
Andreas Kling 2019-08-29 20:57:02 +02:00
parent 0e53b1d1ad
commit d720388acf
2 changed files with 62 additions and 16 deletions
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5
Kernel/Process.h
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@ -275,6 +275,8 @@ public:
Region* allocate_region(VirtualAddress, size_t, const String& name, int prot = PROT_READ | PROT_WRITE, bool commit = true);
bool deallocate_region(Region& region);
Region& allocate_split_region(const Region& source_region, const Range&);
void set_being_inspected(bool b) { m_being_inspected = b; }
bool is_being_inspected() const { return m_being_inspected; }
@ -348,7 +350,8 @@ private:
TTY* m_tty { nullptr };
Region* region_from_range(VirtualAddress, size_t);
Region* region_from_range(const Range&);
Region* region_containing(const Range&);
NonnullRefPtrVector<Region> m_regions;