Kernel: Make VM allocation atomic for userspace regions

This patch move AddressSpace (the per-process memory manager) to using
the new atomic "place" APIs in RegionTree as well, just like we did for
MemoryManager in the previous commit.

This required updating quite a few places where VM allocation and
actually committing a Region object to the AddressSpace were separated
by other code.

All you have to do now is call into AddressSpace once and it'll take
care of everything for you.

1 files changed, 2 insertions, 0 deletions

diff --git a/Kernel/Memory/RegionTree.h b/Kernel/Memory/RegionTree.h
index 560a4f2aa0..ec1aa82ee0 100644
--- a/Kernel/Memory/RegionTree.h
+++ b/Kernel/Memory/RegionTree.h
@@ -37,6 +37,8 @@ public:
     ErrorOr<void> place_anywhere(Region&, size_t size, size_t alignment = PAGE_SIZE);
     ErrorOr<void> place_specifically(Region&, VirtualRange const&);
 
+    ErrorOr<NonnullOwnPtr<Memory::Region>> create_identity_mapped_region(PhysicalAddress, size_t);
+
     ErrorOr<VirtualRange> try_allocate_anywhere(size_t size, size_t alignment = PAGE_SIZE);
     ErrorOr<VirtualRange> try_allocate_specific(VirtualAddress base, size_t size);
     ErrorOr<VirtualRange> try_allocate_randomized(size_t size, size_t alignment = PAGE_SIZE);