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Kernel: Add Memory::RegionTree to share code between AddressSpace and MM

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RegionTree holds an IntrusiveRedBlackTree of Region objects and vends a
set of APIs for allocating memory ranges.

It's used by AddressSpace at the moment, and will be used by MM soon.
This commit is contained in:
Andreas Kling 2022-04-02 21:12:05 +02:00
parent 02a95a196f
commit ffe2e77eba
8 changed files with 219 additions and 154 deletions
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16
Kernel/Memory/AddressSpace.h
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@ -13,6 +13,7 @@
#include <Kernel/Memory/AllocationStrategy.h>
#include <Kernel/Memory/PageDirectory.h>
#include <Kernel/Memory/Region.h>
#include <Kernel/Memory/RegionTree.h>
#include <Kernel/UnixTypes.h>
namespace Kernel::Memory {
@ -27,10 +28,10 @@ public:
ErrorOr<Region*> add_region(NonnullOwnPtr<Region>);
size_t region_count() const { return m_regions.size(); }
size_t region_count() const { return m_region_tree.regions().size(); }
auto& regions() { return m_regions; }
auto const& regions() const { return m_regions; }
auto& regions() { return m_region_tree.regions(); }
auto const& regions() const { return m_region_tree.regions(); }
void dump_regions();
@ -66,21 +67,16 @@ public:
size_t amount_purgeable_volatile() const;
size_t amount_purgeable_nonvolatile() const;
ErrorOr<VirtualRange> try_allocate_anywhere(size_t size, size_t alignment);
ErrorOr<VirtualRange> try_allocate_specific(VirtualAddress base, size_t size);
ErrorOr<VirtualRange> try_allocate_randomized(size_t size, size_t alignment);
auto& region_tree() { return m_region_tree; }
private:
AddressSpace(NonnullRefPtr<PageDirectory>, VirtualRange total_range);
void delete_all_regions_assuming_they_are_unmapped();
mutable RecursiveSpinlock m_lock;
RefPtr<PageDirectory> m_page_directory;
IntrusiveRedBlackTree<&Region::m_tree_node> m_regions;
VirtualRange const m_total_range;
RegionTree m_region_tree;
bool m_enforces_syscall_regions { false };
};