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

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

View file

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/*
* Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Error.h>
#include <AK/IntrusiveRedBlackTree.h>
#include <Kernel/Memory/Region.h>
#include <Kernel/Memory/VirtualRange.h>
#include <Kernel/VirtualAddress.h>
namespace Kernel::Memory {
class RegionTree {
AK_MAKE_NONCOPYABLE(RegionTree);
AK_MAKE_NONMOVABLE(RegionTree);
public:
explicit RegionTree(VirtualRange total_range)
: m_total_range(total_range)
{
}
~RegionTree();
auto& regions() { return m_regions; }
auto const& regions() const { return m_regions; }
VirtualRange total_range() const { return m_total_range; }
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);
void delete_all_regions_assuming_they_are_unmapped();
private:
IntrusiveRedBlackTree<&Region::m_tree_node> m_regions;
VirtualRange const m_total_range;
};
}