mirror of
https://github.com/RetroDECK/Supermodel.git
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110 lines
2.8 KiB
C++
110 lines
2.8 KiB
C++
/**
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** Supermodel
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** A Sega Model 3 Arcade Emulator.
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** Copyright 2011 Bart Trzynadlowski
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**
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** This file is part of Supermodel.
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**
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** Supermodel is free software: you can redistribute it and/or modify it under
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** the terms of the GNU General Public License as published by the Free
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** Software Foundation, either version 3 of the License, or (at your option)
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** any later version.
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**
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** Supermodel is distributed in the hope that it will be useful, but WITHOUT
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** ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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** FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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** 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 Supermodel. If not, see <http://www.gnu.org/licenses/>.
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**/
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/*
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* Bus.h
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*
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* Header file for the CBus abstract base class.
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*/
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#ifndef INCLUDED_BUS_H
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#define INCLUDED_BUS_H
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/*
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* CBus:
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*
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* An abstract base class for an address bus. Defines handlers for 8-, 16-,
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* 32-, and 64-bit random access. Endianness should depend on the application.
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*
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* Two buses are supported: a memory bus and an IO bus. All addresses are 32
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* bits.
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*/
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class CBus
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{
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public:
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/*
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* Read8(addr):
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* Read16(addr):
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* Read32(addr):
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* Read64(addr):
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*
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* Read handlers.
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*
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* Parameters:
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* addr Address (caller should ensure it is aligned to the correct
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* boundary, corresponding to the size).
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*
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* Returns:
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* Data of the appropriate size (8, 16, 32, or 64 bits).
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*/
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virtual UINT8 Read8(UINT32 addr) { return 0xFF; }
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virtual UINT16 Read16(UINT32 addr) { return 0xFFFF; }
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virtual UINT32 Read32(UINT32 addr) { return 0xFFFFFFFF; }
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virtual UINT64 Read64(UINT32 addr) { return 0xFFFFFFFFFFFFFFFFULL; }
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/*
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* Write8(addr, data):
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* Write16(addr, data):
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* Write32(addr, data):
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* Write64(addr, data):
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*
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* Write handlers.
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*
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* Parameters:
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* addr Address (caller should ensure it is aligned to the correct
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* boundary, corresponding to the size).
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* data Data to write.
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*/
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virtual void Write8(UINT32 addr, UINT8 data) {}
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virtual void Write16(UINT32 addr, UINT16 data) {}
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virtual void Write32(UINT32 addr, UINT32 data) {}
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virtual void Write64(UINT32 addr, UINT64 data) {}
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/*
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* IORead8(addr):
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*
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* Read handler for the IO bus. Only 8-bit data supported for now. Add more
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* as needed.
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*
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* Parameters:
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* addr Address.
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*
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* Returns:
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* Data.
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*/
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virtual UINT8 IORead8(UINT32 addr) { return 0xFF; }
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/*
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* IOWrite8(addr, data):
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*
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* Write handler for the IO bus.
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*
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* Parameters:
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* addr Address.
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* data Data to write.
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*/
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virtual void IOWrite8(UINT32 addr, UINT8 data) {}
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};
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#endif // INCLUDED_BUS_H
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