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Kernel: Make Region single-owner instead of ref-counted

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This simplifies the ownership model and makes Region easier to reason
about. Userspace Regions are now primarily kept by Process::m_regions.

Kernel Regions are kept in various OwnPtr<Regions>'s.

Regions now only ever get unmapped when they are destroyed.
This commit is contained in:
Andreas Kling 2019-09-27 14:19:07 +02:00
parent 7a7f6a24e9
commit 7f9a33dba1
9 changed files with 44 additions and 41 deletions
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4
Kernel/VM/MemoryManager.h
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@ -71,8 +71,8 @@ public:
void map_for_kernel(VirtualAddress, PhysicalAddress);
RefPtr<Region> allocate_kernel_region(size_t, const StringView& name, bool user_accessible = false, bool should_commit = true);
RefPtr<Region> allocate_user_accessible_kernel_region(size_t, const StringView& name);
OwnPtr<Region> allocate_kernel_region(size_t, const StringView& name, bool user_accessible = false, bool should_commit = true);
OwnPtr<Region> allocate_user_accessible_kernel_region(size_t, const StringView& name);
void map_region_at_address(PageDirectory&, Region&, VirtualAddress);
unsigned user_physical_pages() const { return m_user_physical_pages; }