snes9x/cpu.cpp
2023-03-07 13:58:21 -06:00

171 lines
3.6 KiB
C++

/*****************************************************************************\
Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
This file is licensed under the Snes9x License.
For further information, consult the LICENSE file in the root directory.
\*****************************************************************************/
#include "snes9x.h"
#include "memmap.h"
#include "dma.h"
#include "apu/apu.h"
#include "fxemu.h"
#include "sdd1.h"
#include "srtc.h"
#include "snapshot.h"
#include "cheats.h"
#ifdef DEBUGGER
#include "debug.h"
#endif
static void S9xResetCPU (void);
static void S9xSoftResetCPU (void);
static void S9xResetCPU (void)
{
S9xSoftResetCPU();
Registers.SL = 0xff;
Registers.P.W = 0;
Registers.A.W = 0;
Registers.X.W = 0;
Registers.Y.W = 0;
SetFlags(MemoryFlag | IndexFlag | IRQ | Emulation);
ClearFlags(Decimal);
}
static void S9xSoftResetCPU (void)
{
CPU.Cycles = 182; // Or 188. This is the cycle count just after the jump to the Reset Vector.
CPU.PrevCycles = CPU.Cycles;
CPU.V_Counter = 0;
CPU.Flags = CPU.Flags & (DEBUG_MODE_FLAG | TRACE_FLAG);
CPU.PCBase = NULL;
CPU.NMIPending = FALSE;
CPU.IRQLine = FALSE;
CPU.IRQTransition = FALSE;
CPU.IRQExternal = FALSE;
CPU.MemSpeed = SLOW_ONE_CYCLE;
CPU.MemSpeedx2 = SLOW_ONE_CYCLE * 2;
CPU.FastROMSpeed = SLOW_ONE_CYCLE;
CPU.InDMA = FALSE;
CPU.InHDMA = FALSE;
CPU.InDMAorHDMA = FALSE;
CPU.InWRAMDMAorHDMA = FALSE;
CPU.HDMARanInDMA = 0;
CPU.CurrentDMAorHDMAChannel = -1;
CPU.WhichEvent = HC_RENDER_EVENT;
CPU.NextEvent = Timings.RenderPos;
CPU.WaitingForInterrupt = FALSE;
CPU.AutoSaveTimer = 0;
CPU.SRAMModified = FALSE;
Registers.PBPC = 0;
Registers.PB = 0;
Registers.PCw = S9xGetWord(0xfffc);
OpenBus = Registers.PCh;
Registers.D.W = 0;
Registers.DB = 0;
Registers.SH = 1;
Registers.SL -= 3;
Registers.XH = 0;
Registers.YH = 0;
ICPU.ShiftedPB = 0;
ICPU.ShiftedDB = 0;
SetFlags(MemoryFlag | IndexFlag | IRQ | Emulation);
ClearFlags(Decimal);
Timings.InterlaceField = FALSE;
Timings.H_Max = Timings.H_Max_Master;
Timings.V_Max = Timings.V_Max_Master;
Timings.NMITriggerPos = 0xffff;
Timings.NextIRQTimer = 0x0fffffff;
Timings.IRQFlagChanging = IRQ_NONE;
if (Model->_5A22 == 2)
Timings.WRAMRefreshPos = SNES_WRAM_REFRESH_HC_v2;
else
Timings.WRAMRefreshPos = SNES_WRAM_REFRESH_HC_v1;
S9xSetPCBase(Registers.PBPC);
ICPU.S9xOpcodes = S9xOpcodesE1;
ICPU.S9xOpLengths = S9xOpLengthsM1X1;
S9xUnpackStatus();
}
void S9xReset (void)
{
S9xResetSaveTimer(FALSE);
memset(Memory.RAM, 0x55, sizeof(Memory.RAM));
memset(Memory.VRAM, 0x00, sizeof(Memory.VRAM));
memset(Memory.FillRAM, 0, 0x8000);
S9xResetBSX();
S9xResetCPU();
S9xResetPPU();
S9xResetDMA();
S9xResetAPU();
S9xResetMSU();
if (Settings.DSP)
S9xResetDSP();
if (Settings.SuperFX)
S9xResetSuperFX();
if (Settings.SA1)
S9xSA1Init();
if (Settings.SDD1)
S9xResetSDD1();
if (Settings.SPC7110)
S9xResetSPC7110();
if (Settings.C4)
S9xInitC4();
if (Settings.OBC1)
S9xResetOBC1();
if (Settings.SRTC)
S9xResetSRTC();
if (Settings.MSU1)
S9xMSU1Init();
S9xInitCheatData();
}
void S9xSoftReset (void)
{
S9xResetSaveTimer(FALSE);
memset(Memory.FillRAM, 0, 0x8000);
if (Settings.BS)
S9xResetBSX();
S9xSoftResetCPU();
S9xSoftResetPPU();
S9xResetDMA();
S9xSoftResetAPU();
S9xResetMSU();
if (Settings.DSP)
S9xResetDSP();
if (Settings.SuperFX)
S9xResetSuperFX();
if (Settings.SA1)
S9xSA1Init();
if (Settings.SDD1)
S9xResetSDD1();
if (Settings.SPC7110)
S9xResetSPC7110();
if (Settings.C4)
S9xInitC4();
if (Settings.OBC1)
S9xResetOBC1();
if (Settings.SRTC)
S9xResetSRTC();
if (Settings.MSU1)
S9xMSU1Init();
S9xInitCheatData();
}