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d6e122fd3a
For that, we have a new type of VMObject, called ContiguousVMObject, that is responsible for allocating contiguous physical pages.
74 lines
2.8 KiB
C++
74 lines
2.8 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Bitmap.h>
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#include <AK/NonnullRefPtr.h>
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#include <AK/Optional.h>
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#include <AK/RefCounted.h>
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#include <Kernel/VM/PhysicalPage.h>
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namespace Kernel {
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class PhysicalRegion : public RefCounted<PhysicalRegion> {
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AK_MAKE_ETERNAL
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public:
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static NonnullRefPtr<PhysicalRegion> create(PhysicalAddress lower, PhysicalAddress upper);
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~PhysicalRegion() {}
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void expand(PhysicalAddress lower, PhysicalAddress upper);
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unsigned finalize_capacity();
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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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unsigned used() const { return m_used; }
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unsigned free() const { return m_pages - m_used; }
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bool contains(PhysicalPage& page) const { return page.paddr() >= m_lower && page.paddr() <= m_upper; }
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RefPtr<PhysicalPage> take_free_page(bool supervisor);
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Vector<RefPtr<PhysicalPage>> take_contiguous_free_pages(size_t count, bool supervisor);
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void return_page_at(PhysicalAddress addr);
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void return_page(PhysicalPage&& page) { return_page_at(page.paddr()); }
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private:
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unsigned find_contiguous_free_pages(size_t count);
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Optional<unsigned> find_and_allocate_contiguous_range(size_t count);
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PhysicalRegion(PhysicalAddress lower, PhysicalAddress upper);
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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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unsigned m_used { 0 };
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unsigned m_last { 0 };
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Bitmap m_bitmap;
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};
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}
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