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121 lines
3.5 KiB
C++
121 lines
3.5 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/String.h>
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#include <AK/Traits.h>
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#include <AK/Vector.h>
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#include <Kernel/SpinLock.h>
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#include <Kernel/VirtualAddress.h>
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namespace Kernel {
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class Range {
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friend class RangeAllocator;
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public:
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Range() { }
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Range(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==(const Range& 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(const Range& 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<Range, 2> carve(const Range&);
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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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class RangeAllocator {
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public:
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RangeAllocator();
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~RangeAllocator();
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void initialize_with_range(VirtualAddress, size_t);
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void initialize_from_parent(const RangeAllocator&);
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Range allocate_anywhere(size_t, size_t alignment = PAGE_SIZE);
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Range allocate_specific(VirtualAddress, size_t);
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void deallocate(Range);
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void dump() const;
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bool contains(const Range& range) const
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{
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ScopedSpinLock lock(m_lock);
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return m_total_range.contains(range);
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}
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private:
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void carve_at_index(int, const Range&);
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Vector<Range> m_available_ranges;
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Range m_total_range;
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mutable SpinLock<u8> m_lock;
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};
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inline const LogStream& operator<<(const LogStream& stream, const Range& value)
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{
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return stream << String::format("Range(%x-%x)", value.base().get(), value.end().get() - 1);
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}
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}
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namespace AK {
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template<>
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struct Traits<Kernel::Range> : public GenericTraits<Kernel::Range> {
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static constexpr bool is_trivial() { return true; }
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};
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}
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