AppleWin/source/CPU.h

64 lines
1.7 KiB
C

#pragma once
#include "Common.h"
struct regsrec
{
BYTE a; // accumulator
BYTE x; // index X
BYTE y; // index Y
BYTE ps; // processor status
WORD pc; // program counter
WORD sp; // stack pointer
BYTE bJammed; // CPU has crashed (NMOS 6502 only)
};
// 6502 Processor Status flags
enum {
AF_SIGN = 0x80,
AF_OVERFLOW = 0x40,
AF_RESERVED = 0x20,
AF_BREAK = 0x10,
AF_DECIMAL = 0x08,
AF_INTERRUPT = 0x04,
AF_ZERO = 0x02,
AF_CARRY = 0x01
};
extern regsrec regs;
extern unsigned __int64 g_nCumulativeCycles;
void CpuDestroy ();
void CpuCalcCycles(ULONG nExecutedCycles);
DWORD CpuExecute(const DWORD uCycles, const bool bVideoUpdate);
ULONG CpuGetCyclesThisVideoFrame(ULONG nExecutedCycles);
void CpuCreateCriticalSection(void);
void CpuInitialize(void);
void CpuSetupBenchmark ();
void CpuIrqReset();
void CpuIrqAssert(eIRQSRC Device);
void CpuIrqDeassert(eIRQSRC Device);
void CpuNmiReset();
void CpuNmiAssert(eIRQSRC Device);
void CpuNmiDeassert(eIRQSRC Device);
void CpuReset ();
void CpuSaveSnapshot(class YamlSaveHelper& yamlSaveHelper);
void CpuLoadSnapshot(class YamlLoadHelper& yamlLoadHelper, UINT version);
BYTE CpuRead(USHORT addr, ULONG uExecutedCycles);
void CpuWrite(USHORT addr, BYTE value, ULONG uExecutedCycles);
enum eCpuType {CPU_UNKNOWN=0, CPU_6502=1, CPU_65C02, CPU_Z80}; // Don't change! Persisted to Registry
eCpuType GetMainCpu(void);
void SetMainCpu(eCpuType cpu);
eCpuType ProbeMainCpuDefault(eApple2Type apple2Type);
void SetMainCpuDefault(eApple2Type apple2Type);
eCpuType GetActiveCpu(void);
void SetActiveCpu(eCpuType cpu);
bool IsIrqAsserted(void);
bool Is6502InterruptEnabled(void);
void ResetCyclesExecutedForDebugger(void);
bool IsInterruptInLastExecution(void);