forked from snes9xgit/snes9x
-
Notifications
You must be signed in to change notification settings - Fork 0
/
cpu.cpp
357 lines (286 loc) · 9.82 KB
/
cpu.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
/***********************************************************************************
Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
(c) Copyright 1996 - 2002 Gary Henderson (gary.henderson@ntlworld.com),
Jerremy Koot (jkoot@snes9x.com)
(c) Copyright 2002 - 2004 Matthew Kendora
(c) Copyright 2002 - 2005 Peter Bortas (peter@bortas.org)
(c) Copyright 2004 - 2005 Joel Yliluoma (http://iki.fi/bisqwit/)
(c) Copyright 2001 - 2006 John Weidman (jweidman@slip.net)
(c) Copyright 2002 - 2006 funkyass (funkyass@spam.shaw.ca),
Kris Bleakley (codeviolation@hotmail.com)
(c) Copyright 2002 - 2010 Brad Jorsch (anomie@users.sourceforge.net),
Nach (n-a-c-h@users.sourceforge.net),
(c) Copyright 2002 - 2011 zones (kasumitokoduck@yahoo.com)
(c) Copyright 2006 - 2007 nitsuja
(c) Copyright 2009 - 2017 BearOso,
OV2
(c) Copyright 2017 qwertymodo
(c) Copyright 2011 - 2017 Hans-Kristian Arntzen,
Daniel De Matteis
(Under no circumstances will commercial rights be given)
BS-X C emulator code
(c) Copyright 2005 - 2006 Dreamer Nom,
zones
C4 x86 assembler and some C emulation code
(c) Copyright 2000 - 2003 _Demo_ (_demo_@zsnes.com),
Nach,
zsKnight (zsknight@zsnes.com)
C4 C++ code
(c) Copyright 2003 - 2006 Brad Jorsch,
Nach
DSP-1 emulator code
(c) Copyright 1998 - 2006 _Demo_,
Andreas Naive (andreasnaive@gmail.com),
Gary Henderson,
Ivar (ivar@snes9x.com),
John Weidman,
Kris Bleakley,
Matthew Kendora,
Nach,
neviksti (neviksti@hotmail.com)
DSP-2 emulator code
(c) Copyright 2003 John Weidman,
Kris Bleakley,
Lord Nightmare (lord_nightmare@users.sourceforge.net),
Matthew Kendora,
neviksti
DSP-3 emulator code
(c) Copyright 2003 - 2006 John Weidman,
Kris Bleakley,
Lancer,
z80 gaiden
DSP-4 emulator code
(c) Copyright 2004 - 2006 Dreamer Nom,
John Weidman,
Kris Bleakley,
Nach,
z80 gaiden
OBC1 emulator code
(c) Copyright 2001 - 2004 zsKnight,
pagefault (pagefault@zsnes.com),
Kris Bleakley
Ported from x86 assembler to C by sanmaiwashi
SPC7110 and RTC C++ emulator code used in 1.39-1.51
(c) Copyright 2002 Matthew Kendora with research by
zsKnight,
John Weidman,
Dark Force
SPC7110 and RTC C++ emulator code used in 1.52+
(c) Copyright 2009 byuu,
neviksti
S-DD1 C emulator code
(c) Copyright 2003 Brad Jorsch with research by
Andreas Naive,
John Weidman
S-RTC C emulator code
(c) Copyright 2001 - 2006 byuu,
John Weidman
ST010 C++ emulator code
(c) Copyright 2003 Feather,
John Weidman,
Kris Bleakley,
Matthew Kendora
Super FX x86 assembler emulator code
(c) Copyright 1998 - 2003 _Demo_,
pagefault,
zsKnight
Super FX C emulator code
(c) Copyright 1997 - 1999 Ivar,
Gary Henderson,
John Weidman
Sound emulator code used in 1.5-1.51
(c) Copyright 1998 - 2003 Brad Martin
(c) Copyright 1998 - 2006 Charles Bilyue'
Sound emulator code used in 1.52+
(c) Copyright 2004 - 2007 Shay Green (gblargg@gmail.com)
S-SMP emulator code used in 1.54+
(c) Copyright 2016 byuu
SH assembler code partly based on x86 assembler code
(c) Copyright 2002 - 2004 Marcus Comstedt (marcus@mc.pp.se)
2xSaI filter
(c) Copyright 1999 - 2001 Derek Liauw Kie Fa
HQ2x, HQ3x, HQ4x filters
(c) Copyright 2003 Maxim Stepin (maxim@hiend3d.com)
NTSC filter
(c) Copyright 2006 - 2007 Shay Green
GTK+ GUI code
(c) Copyright 2004 - 2017 BearOso
Win32 GUI code
(c) Copyright 2003 - 2006 blip,
funkyass,
Matthew Kendora,
Nach,
nitsuja
(c) Copyright 2009 - 2017 OV2
Mac OS GUI code
(c) Copyright 1998 - 2001 John Stiles
(c) Copyright 2001 - 2011 zones
Libretro port
(c) Copyright 2011 - 2017 Hans-Kristian Arntzen,
Daniel De Matteis
(Under no circumstances will commercial rights be given)
Specific ports contains the works of other authors. See headers in
individual files.
Snes9x homepage: http://www.snes9x.com/
Permission to use, copy, modify and/or distribute Snes9x in both binary
and source form, for non-commercial purposes, is hereby granted without
fee, providing that this license information and copyright notice appear
with all copies and any derived work.
This software is provided 'as-is', without any express or implied
warranty. In no event shall the authors be held liable for any damages
arising from the use of this software or it's derivatives.
Snes9x is freeware for PERSONAL USE only. Commercial users should
seek permission of the copyright holders first. Commercial use includes,
but is not limited to, charging money for Snes9x or software derived from
Snes9x, including Snes9x or derivatives in commercial game bundles, and/or
using Snes9x as a promotion for your commercial product.
The copyright holders request that bug fixes and improvements to the code
should be forwarded to them so everyone can benefit from the modifications
in future versions.
Super NES and Super Nintendo Entertainment System are trademarks of
Nintendo Co., Limited and its subsidiary companies.
***********************************************************************************/
#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"
#include "logger.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.NMILine = FALSE;
CPU.IRQLine = FALSE;
CPU.IRQTransition = FALSE;
CPU.IRQLastState = FALSE;
CPU.IRQExternal = FALSE;
CPU.IRQPending = Timings.IRQPendCount;
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;
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);
S9xResetLogger();
memset(Memory.RAM, 0x55, 0x20000);
memset(Memory.VRAM, 0x00, 0x10000);
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();
}