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e8f543c390
This patch ports MemoryManager to RegionTree as well. The biggest difference between this and the userspace code is that kernel regions are owned by extant OwnPtr<Region> objects spread around the kernel, while userspace regions are owned by the AddressSpace itself. For kernelspace, there are a couple of situations where we need to make large VM reservations that never get backed by regular VMObjects (for example the kernel image reservation, or the big kmalloc range.) Since we can't make a VM reservation without a Region object anymore, this patch adds a way to create unbacked Region objects that can be used for this exact purpose. They have no internal VMObject.)
69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, Leon Albrecht <leon2002.la@gmail.com>
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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 <Kernel/VirtualAddress.h>
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namespace Kernel::Memory {
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class VirtualRange {
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public:
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VirtualRange() = delete;
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VirtualRange(VirtualAddress base, size_t size)
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: m_base(base)
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, m_size(size)
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{
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}
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VirtualAddress base() const { return m_base; }
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size_t size() const { return m_size; }
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bool is_valid() const { return !m_base.is_null(); }
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bool contains(VirtualAddress vaddr) const { return vaddr >= base() && vaddr < end(); }
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VirtualAddress end() const { return m_base.offset(m_size); }
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bool operator==(VirtualRange const& other) const
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{
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return m_base == other.m_base && m_size == other.m_size;
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}
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bool contains(VirtualAddress base, size_t size) const
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{
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if (base.offset(size) < base)
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return false;
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return base >= m_base && base.offset(size) <= end();
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}
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bool contains(VirtualRange const& other) const
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{
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return contains(other.base(), other.size());
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}
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Vector<VirtualRange, 2> carve(VirtualRange const&) const;
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VirtualRange intersect(VirtualRange const&) const;
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bool intersects(VirtualRange const&) const;
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static ErrorOr<VirtualRange> expand_to_page_boundaries(FlatPtr address, size_t size);
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private:
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VirtualAddress m_base;
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size_t m_size { 0 };
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};
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}
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template<>
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struct AK::Formatter<Kernel::Memory::VirtualRange> : Formatter<FormatString> {
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ErrorOr<void> format(FormatBuilder& builder, Kernel::Memory::VirtualRange value)
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{
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return Formatter<FormatString>::format(builder, "{} - {} (size {:p})", value.base().as_ptr(), value.base().offset(value.size() - 1).as_ptr(), value.size());
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}
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};
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