mirror of https://github.com/pyrollo/vinace.git
99 lines
2.2 KiB
C++
99 lines
2.2 KiB
C++
/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
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/*
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* vinace
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* Copyright (C) P.Y. Rollo 2009 <dev@pyrollo.com>
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*
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* vinace is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* vinace is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _C_MEMORY_HPP_
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#define _C_MEMORY_HPP_
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#include "types.h"
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//
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// CMemory : Abstract memory class
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//
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class CMemory
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{
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public:
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virtual BYTE read(WORD) = 0;
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virtual void write(WORD, BYTE) {};
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};
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//
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// CDummyMemory : A dummy memory that does not remember anything
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//
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class CDummyMemory : public CMemory
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{
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public:
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BYTE read(WORD) { return dummy_byte(); };
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void write(WORD, BYTE) {};
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};
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//
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// CMemoryProxy : A subpart of a memory with addresses translation
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//
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class CMemoryProxy: public CMemory
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{
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public:
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CMemoryProxy(CMemoryProxy *proxy, WORD start);
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CMemoryProxy(CMemory *memory, WORD start);
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BYTE read(WORD addr) { return memory->read(addr + start); }
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void write(WORD addr, BYTE byte) { memory->write(addr + start, byte); }
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// These methods are used when pipelining several proxies
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int get_start();
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CMemory *get_memory();
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protected:
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int start;
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CMemory *memory;
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};
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//
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// CRamMemory : Read / Write standard memory
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//
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class CRamMemory: public CMemory
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{
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public:
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CRamMemory(int size);
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BYTE read(WORD addr) { return (addr < size)?buffer[addr]:dummy_byte(); };
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void write(WORD addr, BYTE byte) { if (addr < size) buffer[addr] = byte; };
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BYTE *get_buffer() { return buffer; }
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int get_size() { return size; }
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protected:
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int size;
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BYTE *buffer;
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};
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//
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// CRomMemory : Read only memory
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//
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class CRomMemory: public CRamMemory
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{
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public:
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CRomMemory(int size):CRamMemory(size) { };
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void write(WORD addr, BYTE byte) { };
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};
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#endif // _C_MEMORY_HPP_
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