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75 lines
2.5 KiB
C++
75 lines
2.5 KiB
C++
//
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// 6502Selector.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 28/09/2020.
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// Copyright © 2020 Thomas Harte. All rights reserved.
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//
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#pragma once
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#include "6502Esque.hpp"
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#include "../6502/6502.hpp"
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#include "../65816/65816.hpp"
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namespace CPU::MOS6502Esque {
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enum class Type {
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TNES6502, // the NES's 6502, which is like a 6502 but lacks decimal mode (though it retains the decimal flag)
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T6502, // the original [NMOS] 6502, replete with various undocumented instructions
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TSynertek65C02, // a 6502 extended with BRA, P[H/L][X/Y], STZ, TRB, TSB and the (zp) addressing mode and a few other additions
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TRockwell65C02, // like the Synertek, but with BBR, BBS, RMB and SMB
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TWDC65C02, // like the Rockwell, but with STP and WAI
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TWDC65816, // the slightly 16-bit follow-up to the 6502
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};
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/*
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Machines that can use either a 6502 or a 65816 can use CPU::MOS6502Esque::Processor in order to select the proper
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class in much the same way that a raw user of CPU::MOS6502::Processor would set the personality. Just provide one
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of the type enums as above as the appropriate template parameter.
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*/
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template <Type processor_type, typename BusHandler, bool uses_ready_line> class Processor:
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public CPU::MOS6502::Processor<CPU::MOS6502::Personality(processor_type), BusHandler, uses_ready_line> {
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using CPU::MOS6502::Processor<CPU::MOS6502::Personality(processor_type), BusHandler, uses_ready_line>::Processor;
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};
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template <typename BusHandler, bool uses_ready_line> class Processor<Type::TWDC65816, BusHandler, uses_ready_line>:
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public CPU::WDC65816::Processor<BusHandler, uses_ready_line> {
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using CPU::WDC65816::Processor<BusHandler, uses_ready_line>::Processor;
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};
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/*
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Using BusHandlerT allows bus size to be defaulted by processor type.
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*/
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template <Type processor_type> class BusHandlerT: public BusHandler<uint16_t> {};
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template <> class BusHandlerT<Type::TWDC65816>: public BusHandler<uint32_t> {};
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/*
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Query for implemented registers.
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*/
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constexpr bool has(Type processor_type, Register r) {
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switch(r) {
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case Register::LastOperationAddress:
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case Register::ProgramCounter:
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case Register::StackPointer:
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case Register::Flags:
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case Register::A:
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case Register::X:
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case Register::Y:
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return true;
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case Register::EmulationFlag:
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case Register::DataBank:
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case Register::ProgramBank:
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case Register::Direct:
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return processor_type == Type::TWDC65816;
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}
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}
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constexpr bool has_extended_bus_output(Type processor_type) {
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return processor_type == Type::TWDC65816;
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}
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}
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