mirror of
https://github.com/JorjBauer/aiie.git
synced 2024-09-10 10:54:27 +00:00
198 lines
2.2 KiB
C++
198 lines
2.2 KiB
C++
#ifndef __CPU_H
|
|
#define __CPU_H
|
|
|
|
#include <stdlib.h>
|
|
#include <stdint.h>
|
|
|
|
class MMU;
|
|
|
|
enum addrmode {
|
|
A_ILLEGAL,
|
|
A_IMM,
|
|
A_ABS,
|
|
A_ZER,
|
|
A_IMP,
|
|
A_ACC,
|
|
A_REL,
|
|
A_ABI,
|
|
A_ZEX,
|
|
A_ZEY,
|
|
A_ZIND,
|
|
A_ABX,
|
|
A_ABXI,
|
|
A_ABY,
|
|
A_INX,
|
|
A_INY,
|
|
A_ZPREL
|
|
};
|
|
|
|
enum optype {
|
|
O_ILLEGAL,
|
|
O_ADC,
|
|
O_AND,
|
|
O_ASL,
|
|
O_ASL_ACC,
|
|
O_BCC,
|
|
O_BCS,
|
|
O_BEQ,
|
|
O_BIT,
|
|
O_BMI,
|
|
O_BNE,
|
|
O_BPL,
|
|
O_BRA,
|
|
O_BRK,
|
|
O_BVC,
|
|
O_BVS,
|
|
O_CLC,
|
|
O_CLD,
|
|
O_CLI,
|
|
O_CLV,
|
|
O_CMP,
|
|
O_CPX,
|
|
O_CPY,
|
|
O_DEC,
|
|
O_DEC_ACC,
|
|
O_DEX,
|
|
O_DEY,
|
|
O_EOR,
|
|
O_INC,
|
|
O_INC_ACC,
|
|
O_INX,
|
|
O_INY,
|
|
O_JMP,
|
|
O_JSR,
|
|
O_LDA,
|
|
O_LDX,
|
|
O_LDY,
|
|
O_LSR,
|
|
O_LSR_ACC,
|
|
O_NOP,
|
|
O_ORA,
|
|
O_PHA,
|
|
O_PHP,
|
|
O_PHX,
|
|
O_PHY,
|
|
O_PLA,
|
|
O_PLP,
|
|
O_PLX,
|
|
O_PLY,
|
|
O_ROL,
|
|
O_ROL_ACC,
|
|
O_ROR,
|
|
O_ROR_ACC,
|
|
O_RTI,
|
|
O_RTS,
|
|
O_SBC,
|
|
O_SEC,
|
|
O_SED,
|
|
O_SEI,
|
|
O_STA,
|
|
O_STX,
|
|
O_STY,
|
|
O_STZ,
|
|
O_TAX,
|
|
O_TAY,
|
|
O_TRB,
|
|
O_TSB,
|
|
O_TSX,
|
|
O_TXA,
|
|
O_TXS,
|
|
O_TYA,
|
|
|
|
O_BBR,
|
|
O_BBS,
|
|
O_RMB,
|
|
O_SMB,
|
|
|
|
O_WAI,
|
|
|
|
// and the "illegal" opcodes (those that don't officially exist for
|
|
// the 65c02, but have repeatable results)
|
|
O_DCP
|
|
};
|
|
|
|
typedef struct {
|
|
optype op;
|
|
addrmode mode;
|
|
uint8_t cycles;
|
|
} optype_t;
|
|
|
|
extern optype_t opcodes[256];
|
|
|
|
// Flags (P) register bit definitions.
|
|
// Negative
|
|
#define F_N (1<<7)
|
|
// Overflow
|
|
#define F_V (1<<6)
|
|
#define F_UNK (1<<5) // What the heck is this?
|
|
// Break
|
|
#define F_B (1<<4)
|
|
// Decimal
|
|
#define F_D (1<<3)
|
|
// Interrupt Disable
|
|
#define F_I (1<<2)
|
|
// Zero
|
|
#define F_Z (1<<1)
|
|
// Carry
|
|
#define F_C (1<<0)
|
|
|
|
class Cpu {
|
|
public:
|
|
Cpu();
|
|
~Cpu();
|
|
|
|
bool Serialize(int8_t fh);
|
|
bool Deserialize(int8_t fh);
|
|
|
|
void Reset();
|
|
|
|
void nmi();
|
|
void rst();
|
|
void brk();
|
|
void irq();
|
|
|
|
uint8_t Run(uint8_t numSteps);
|
|
uint8_t step();
|
|
|
|
uint8_t X();
|
|
uint8_t Y();
|
|
uint8_t A();
|
|
uint16_t PC();
|
|
uint8_t SP();
|
|
uint8_t P();
|
|
|
|
void stageIRQ();
|
|
|
|
protected:
|
|
// Stack manipulation
|
|
void pushS8(uint8_t b);
|
|
void pushS16(uint16_t w);
|
|
uint8_t popS8();
|
|
uint16_t popS16();
|
|
|
|
public:
|
|
void SetMMU(MMU *mmu) { this->mmu = mmu; }
|
|
|
|
void realtime();
|
|
|
|
public:
|
|
uint16_t pc;
|
|
uint8_t sp;
|
|
uint8_t a;
|
|
uint8_t x;
|
|
uint8_t y;
|
|
uint8_t flags;
|
|
|
|
uint32_t cycles;
|
|
|
|
bool irqPending;
|
|
|
|
MMU *mmu;
|
|
|
|
bool realtimeProcessing;
|
|
};
|
|
|
|
|
|
|
|
#endif
|