mirror of
https://github.com/RGBCube/serenity
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e852a69a06
Instead of first allocating the VM range, and then inserting a region
with that range into the MM region tree, we now do both things in a
single atomic operation:
- RegionTree::place_anywhere(Region&, size, alignment)
- RegionTree::place_specifically(Region&, address, size)
To reduce the number of things we do while locking the region tree,
we also require callers to provide a constructed Region object.
53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
/*
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* Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Error.h>
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#include <AK/IntrusiveRedBlackTree.h>
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#include <Kernel/Locking/Spinlock.h>
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#include <Kernel/Memory/Region.h>
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#include <Kernel/Memory/VirtualRange.h>
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#include <Kernel/VirtualAddress.h>
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namespace Kernel::Memory {
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class RegionTree {
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AK_MAKE_NONCOPYABLE(RegionTree);
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AK_MAKE_NONMOVABLE(RegionTree);
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public:
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explicit RegionTree(VirtualRange total_range)
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: m_total_range(total_range)
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{
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}
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~RegionTree();
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auto& regions() { return m_regions; }
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auto const& regions() const { return m_regions; }
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VirtualRange total_range() const { return m_total_range; }
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ErrorOr<NonnullOwnPtr<Region>> allocate_unbacked_anywhere(size_t size, size_t alignment = PAGE_SIZE);
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ErrorOr<void> place_anywhere(Region&, size_t size, size_t alignment = PAGE_SIZE);
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ErrorOr<void> place_specifically(Region&, VirtualRange const&);
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ErrorOr<VirtualRange> try_allocate_anywhere(size_t size, size_t alignment = PAGE_SIZE);
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ErrorOr<VirtualRange> try_allocate_specific(VirtualAddress base, size_t size);
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ErrorOr<VirtualRange> try_allocate_randomized(size_t size, size_t alignment = PAGE_SIZE);
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void delete_all_regions_assuming_they_are_unmapped();
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private:
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Spinlock m_lock;
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IntrusiveRedBlackTree<&Region::m_tree_node> m_regions;
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VirtualRange const m_total_range;
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};
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}
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