EightBit/inc/Processor.h
2020-02-09 11:51:58 +00:00

106 lines
2.5 KiB
C++

#pragma once
#include <cstdint>
#include "ClockedChip.h"
#include "Bus.h"
#include "Register.h"
#include "EventArgs.h"
#include "Signal.h"
#include "EightBitCompilerDefinitions.h"
namespace EightBit {
class Processor : public ClockedChip {
public:
// b: number of bits representing the number in x
// x: sign extend this b-bit number to r
[[nodiscard]] static int8_t signExtend(int b, uint8_t x);
~Processor() {};
[[nodiscard]] auto& PC() noexcept { return m_pc; }
int run(int limit);
virtual int step() = 0;
virtual int execute() = 0;
int execute(uint8_t value);
[[nodiscard]] virtual register16_t peekWord(register16_t address) = 0;
virtual void pokeWord(register16_t address, register16_t value) = 0;
DECLARE_PIN_INPUT(RESET)
DECLARE_PIN_INPUT(INT)
protected:
Processor(Bus& memory);
[[nodiscard]] auto& opcode() noexcept { return m_opcode; }
[[nodiscard]] auto& BUS() noexcept { return m_bus; }
virtual void handleRESET();
virtual void handleINT();
void memoryWrite(register16_t address, uint8_t data);
void memoryWrite(uint8_t data);
virtual void memoryWrite();
virtual void busWrite();
uint8_t memoryRead(register16_t address);
virtual uint8_t memoryRead();
virtual uint8_t busRead();
auto getBytePaged(const uint8_t page, const uint8_t offset) {
return memoryRead(register16_t(offset, page));
}
void setBytePaged(const uint8_t page, const uint8_t offset, const uint8_t value) {
memoryWrite(register16_t(offset, page), value);
}
auto fetchByte() {
return memoryRead(PC()++);
}
[[nodiscard]] virtual register16_t getWord() = 0;
virtual void setWord(register16_t value) = 0;
[[nodiscard]] virtual register16_t getWordPaged(uint8_t page, uint8_t offset) = 0;
virtual void setWordPaged(uint8_t page, uint8_t offset, register16_t value) = 0;
[[nodiscard]] virtual register16_t fetchWord() = 0;
virtual void push(uint8_t value) = 0;
[[nodiscard]] virtual uint8_t pop() = 0;
virtual void pushWord(register16_t value) = 0;
[[nodiscard]] virtual register16_t popWord() = 0;
[[nodiscard]] auto getWord(const register16_t address) {
BUS().ADDRESS() = address;
return getWord();
}
void setWord(const register16_t address, const register16_t value) {
BUS().ADDRESS() = address;
setWord(value);
}
void jump(const register16_t destination) noexcept {
PC() = destination;
}
virtual void call(const register16_t destination) {
pushWord(PC());
jump(destination);
}
virtual void ret();
private:
Bus& m_bus;
uint8_t m_opcode = Mask8;
register16_t m_pc;
};
}