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https://github.com/RGBCube/serenity
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e3e40cca65
Since it's possible to determine where the small zones will start to occur for each PhysicalRegion, we can use arithmetic so that the call time for both large and small zones is identical.
60 lines
1.5 KiB
C++
60 lines
1.5 KiB
C++
/*
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* Copyright (c) 2018-2021, 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/OwnPtr.h>
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#include <Kernel/Memory/PhysicalPage.h>
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#include <Kernel/Memory/PhysicalZone.h>
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namespace Kernel::Memory {
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class PhysicalRegion {
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AK_MAKE_ETERNAL;
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AK_MAKE_NONCOPYABLE(PhysicalRegion);
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AK_MAKE_NONMOVABLE(PhysicalRegion);
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public:
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static OwnPtr<PhysicalRegion> try_create(PhysicalAddress lower, PhysicalAddress upper)
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{
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return adopt_own_if_nonnull(new PhysicalRegion { lower, upper });
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}
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~PhysicalRegion();
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void initialize_zones();
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PhysicalAddress lower() const { return m_lower; }
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PhysicalAddress upper() const { return m_upper; }
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unsigned size() const { return m_pages; }
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bool contains(PhysicalAddress paddr) const { return paddr >= m_lower && paddr < m_upper; }
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OwnPtr<PhysicalRegion> try_take_pages_from_beginning(unsigned);
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RefPtr<PhysicalPage> take_free_page();
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NonnullRefPtrVector<PhysicalPage> take_contiguous_free_pages(size_t count);
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void return_page(PhysicalAddress);
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private:
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PhysicalRegion(PhysicalAddress lower, PhysicalAddress upper);
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static constexpr size_t large_zone_size = 16 * MiB;
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static constexpr size_t small_zone_size = 1 * MiB;
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NonnullOwnPtrVector<PhysicalZone> m_zones;
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size_t m_large_zones;
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size_t m_small_zones;
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PhysicalZone::List m_usable_zones;
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PhysicalZone::List m_full_zones;
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PhysicalAddress m_lower;
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PhysicalAddress m_upper;
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unsigned m_pages { 0 };
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};
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}
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