mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-23 03:32:32 +00:00
75 lines
2.5 KiB
C++
75 lines
2.5 KiB
C++
//
|
|
// 6502Selector.hpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 28/09/2020.
|
|
// Copyright © 2020 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#pragma once
|
|
|
|
#include "6502Esque.hpp"
|
|
#include "../6502/6502.hpp"
|
|
#include "../65816/65816.hpp"
|
|
|
|
namespace CPU::MOS6502Esque {
|
|
|
|
enum class Type {
|
|
TNES6502, // the NES's 6502, which is like a 6502 but lacks decimal mode (though it retains the decimal flag)
|
|
T6502, // the original [NMOS] 6502, replete with various undocumented instructions
|
|
TSynertek65C02, // a 6502 extended with BRA, P[H/L][X/Y], STZ, TRB, TSB and the (zp) addressing mode and a few other additions
|
|
TRockwell65C02, // like the Synertek, but with BBR, BBS, RMB and SMB
|
|
TWDC65C02, // like the Rockwell, but with STP and WAI
|
|
TWDC65816, // the slightly 16-bit follow-up to the 6502
|
|
};
|
|
|
|
/*
|
|
Machines that can use either a 6502 or a 65816 can use CPU::MOS6502Esque::Processor in order to select the proper
|
|
class in much the same way that a raw user of CPU::MOS6502::Processor would set the personality. Just provide one
|
|
of the type enums as above as the appropriate template parameter.
|
|
*/
|
|
|
|
template <Type processor_type, typename BusHandler, bool uses_ready_line> class Processor:
|
|
public CPU::MOS6502::Processor<CPU::MOS6502::Personality(processor_type), BusHandler, uses_ready_line> {
|
|
using CPU::MOS6502::Processor<CPU::MOS6502::Personality(processor_type), BusHandler, uses_ready_line>::Processor;
|
|
};
|
|
|
|
template <typename BusHandler, bool uses_ready_line> class Processor<Type::TWDC65816, BusHandler, uses_ready_line>:
|
|
public CPU::WDC65816::Processor<BusHandler, uses_ready_line> {
|
|
using CPU::WDC65816::Processor<BusHandler, uses_ready_line>::Processor;
|
|
};
|
|
|
|
/*
|
|
Using BusHandlerT allows bus size to be defaulted by processor type.
|
|
*/
|
|
template <Type processor_type> class BusHandlerT: public BusHandler<uint16_t> {};
|
|
template <> class BusHandlerT<Type::TWDC65816>: public BusHandler<uint32_t> {};
|
|
|
|
/*
|
|
Query for implemented registers.
|
|
*/
|
|
constexpr bool has(Type processor_type, Register r) {
|
|
switch(r) {
|
|
case Register::LastOperationAddress:
|
|
case Register::ProgramCounter:
|
|
case Register::StackPointer:
|
|
case Register::Flags:
|
|
case Register::A:
|
|
case Register::X:
|
|
case Register::Y:
|
|
return true;
|
|
|
|
case Register::EmulationFlag:
|
|
case Register::DataBank:
|
|
case Register::ProgramBank:
|
|
case Register::Direct:
|
|
return processor_type == Type::TWDC65816;
|
|
}
|
|
}
|
|
|
|
constexpr bool has_extended_bus_output(Type processor_type) {
|
|
return processor_type == Type::TWDC65816;
|
|
}
|
|
|
|
}
|