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cf16b2c8e6
This forces anyone who wants to look into and/or manipulate an address space to lock it. And this replaces the previous, more flimsy, manual spinlock use. Note that pointers *into* the address space are not safe to use after you unlock the space. We've got many issues like this, and we'll have to track those down as wlel.
63 lines
1.8 KiB
C++
63 lines
1.8 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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enum class RandomizeVirtualAddress {
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No,
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Yes,
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};
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// RegionTree represents a virtual address space.
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// It is used by MemoryManager for kernel VM and by AddressSpace for user VM.
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// Regions are stored in an intrusive data structure and there are no allocations when interacting with it.
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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<void> place_anywhere(Region&, RandomizeVirtualAddress, size_t size, size_t alignment = PAGE_SIZE);
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ErrorOr<void> place_specifically(Region&, VirtualRange const&);
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void delete_all_regions_assuming_they_are_unmapped();
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bool remove(Region&);
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Region* find_region_containing(VirtualAddress);
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Region* find_region_containing(VirtualRange);
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private:
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ErrorOr<VirtualRange> allocate_range_anywhere(size_t size, size_t alignment = PAGE_SIZE);
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ErrorOr<VirtualRange> allocate_range_specific(VirtualAddress base, size_t size);
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ErrorOr<VirtualRange> allocate_range_randomized(size_t size, size_t alignment = PAGE_SIZE);
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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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