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https://github.com/RGBCube/serenity
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89483a9408
This patch brings Kernel::RangeAllocator to UserspaceEmulator in a slightly simplified form. It supports the basic three allocation types needed by virt$mmap(): allocate_anywhere, allocate_specific, and allocate_randomized. Porting virt$mmap() and virt$munmap() to use the allocator makes UE work correctly once again. :^)
57 lines
2.1 KiB
C++
57 lines
2.1 KiB
C++
/*
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* Copyright (c) 2018-2021, 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 "Range.h"
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#include <AK/Vector.h>
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namespace UserspaceEmulator {
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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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Optional<Range> allocate_anywhere(size_t, size_t alignment = PAGE_SIZE);
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Optional<Range> allocate_specific(VirtualAddress, size_t);
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Optional<Range> allocate_randomized(size_t, size_t alignment);
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void deallocate(const Range&);
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void dump() const;
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bool contains(const Range& range) const { return m_total_range.contains(range); }
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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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};
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}
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