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d5c46cf528
This Emulator sub-object will keep track of all active memory regions and handle memory read/write operations from the CPU. A memory region is currently represented by a virtual Region object that can implement arbitrary behavior by overriding read/write ops.
71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
/*
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* Copyright (c) 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/NonnullOwnPtrVector.h>
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#include <AK/Types.h>
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namespace UserspaceEmulator {
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class SoftMMU {
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public:
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class Region {
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public:
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virtual ~Region() { }
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u32 base() const { return m_base; }
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u32 size() const { return m_size; }
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u32 end() const { return m_base + m_size; }
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bool contains(u32 address) const { return address >= base() && address < end(); }
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virtual void write32(u32 offset, u32 value) = 0;
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virtual u32 read32(u32 offset) = 0;
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protected:
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Region(u32 base, u32 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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private:
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u32 m_base { 0 };
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u32 m_size { 0 };
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};
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u32 read32(u32 address);
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void write32(u32 address, u32 value);
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Region* find_region(u32 address);
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void add_region(NonnullOwnPtr<Region>);
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private:
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NonnullOwnPtrVector<Region> m_regions;
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};
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}
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