From d40ae99422e118188a7f48055dc340c6aca022aa Mon Sep 17 00:00:00 2001 From: Kitty Draper Date: Sat, 5 Mar 2011 21:39:25 -0500 Subject: first commit --- source/cpuexec.h | 226 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 226 insertions(+) create mode 100644 source/cpuexec.h (limited to 'source/cpuexec.h') diff --git a/source/cpuexec.h b/source/cpuexec.h new file mode 100644 index 0000000..9a26081 --- /dev/null +++ b/source/cpuexec.h @@ -0,0 +1,226 @@ +/******************************************************************************* + Snes9x - Portable Super Nintendo Entertainment System (TM) emulator. + + (c) Copyright 1996 - 2002 Gary Henderson (gary.henderson@ntlworld.com) and + Jerremy Koot (jkoot@snes9x.com) + + (c) Copyright 2001 - 2004 John Weidman (jweidman@slip.net) + + (c) Copyright 2002 - 2004 Brad Jorsch (anomie@users.sourceforge.net), + funkyass (funkyass@spam.shaw.ca), + Joel Yliluoma (http://iki.fi/bisqwit/) + Kris Bleakley (codeviolation@hotmail.com), + Matthew Kendora, + Nach (n-a-c-h@users.sourceforge.net), + Peter Bortas (peter@bortas.org) and + zones (kasumitokoduck@yahoo.com) + + C4 x86 assembler and some C emulation code + (c) Copyright 2000 - 2003 zsKnight (zsknight@zsnes.com), + _Demo_ (_demo_@zsnes.com), and Nach + + C4 C++ code + (c) Copyright 2003 Brad Jorsch + + DSP-1 emulator code + (c) Copyright 1998 - 2004 Ivar (ivar@snes9x.com), _Demo_, Gary Henderson, + John Weidman, neviksti (neviksti@hotmail.com), + Kris Bleakley, Andreas Naive + + DSP-2 emulator code + (c) Copyright 2003 Kris Bleakley, John Weidman, neviksti, Matthew Kendora, and + Lord Nightmare (lord_nightmare@users.sourceforge.net + + OBC1 emulator code + (c) Copyright 2001 - 2004 zsKnight, pagefault (pagefault@zsnes.com) and + Kris Bleakley + Ported from x86 assembler to C by sanmaiwashi + + SPC7110 and RTC C++ emulator code + (c) Copyright 2002 Matthew Kendora with research by + zsKnight, John Weidman, and Dark Force + + S-DD1 C emulator code + (c) Copyright 2003 Brad Jorsch with research by + Andreas Naive and John Weidman + + S-RTC C emulator code + (c) Copyright 2001 John Weidman + + ST010 C++ emulator code + (c) Copyright 2003 Feather, Kris Bleakley, John Weidman and Matthew Kendora + + Super FX x86 assembler emulator code + (c) Copyright 1998 - 2003 zsKnight, _Demo_, and pagefault + + Super FX C emulator code + (c) Copyright 1997 - 1999 Ivar, Gary Henderson and John Weidman + + + SH assembler code partly based on x86 assembler code + (c) Copyright 2002 - 2004 Marcus Comstedt (marcus@mc.pp.se) + + + 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 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. + + Snes9x is freeware for PERSONAL USE only. Commercial users should + seek permission of the copyright holders first. Commercial use includes + charging money for Snes9x or software derived from Snes9x. + + 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. +*******************************************************************************/ + +#ifndef _CPUEXEC_H_ +#define _CPUEXEC_H_ +#include "ppu.h" +#include "memmap.h" +#include "65c816.h" + +#define DO_HBLANK_CHECK() \ + if (CPU.Cycles >= CPU.NextEvent) \ + S9xDoHBlankProcessing (); + +struct SOpcodes { +#ifdef __WIN32__ + void (__cdecl *S9xOpcode)( void); +#else + void (*S9xOpcode)( void); +#endif +}; + +struct SICPU +{ + uint8 *Speed; + struct SOpcodes *S9xOpcodes; + uint8 _Carry; + uint8 _Zero; + uint8 _Negative; + uint8 _Overflow; + bool8 CPUExecuting; + uint32 ShiftedPB; + uint32 ShiftedDB; + uint32 Frame; + uint32 Scanline; + uint32 FrameAdvanceCount; +}; + +START_EXTERN_C +void S9xMainLoop (void); +void S9xReset (void); +void S9xSoftReset (void); +void S9xDoHBlankProcessing (); +void S9xClearIRQ (uint32); +void S9xSetIRQ (uint32); + +extern struct SOpcodes S9xOpcodesE1 [256]; +extern struct SOpcodes S9xOpcodesM1X1 [256]; +extern struct SOpcodes S9xOpcodesM1X0 [256]; +extern struct SOpcodes S9xOpcodesM0X1 [256]; +extern struct SOpcodes S9xOpcodesM0X0 [256]; + +extern struct SICPU ICPU; +END_EXTERN_C + +STATIC inline void S9xUnpackStatus() +{ + ICPU._Zero = (Registers.PL & Zero) == 0; + ICPU._Negative = (Registers.PL & Negative); + ICPU._Carry = (Registers.PL & Carry); + ICPU._Overflow = (Registers.PL & Overflow) >> 6; +} + +STATIC inline void S9xPackStatus() +{ + Registers.PL &= ~(Zero | Negative | Carry | Overflow); + Registers.PL |= ICPU._Carry | ((ICPU._Zero == 0) << 1) | + (ICPU._Negative & 0x80) | (ICPU._Overflow << 6); +} + +STATIC inline void CLEAR_IRQ_SOURCE (uint32 M) +{ + CPU.IRQActive &= ~M; + if (!CPU.IRQActive) + CPU.Flags &= ~IRQ_PENDING_FLAG; +} + +STATIC inline void S9xFixCycles () +{ + if (CheckEmulation ()) + { + ICPU.S9xOpcodes = S9xOpcodesE1; + } + else + if (CheckMemory ()) + { + if (CheckIndex ()) + { + ICPU.S9xOpcodes = S9xOpcodesM1X1; + } + else + { + ICPU.S9xOpcodes = S9xOpcodesM1X0; + } + } + else + { + if (CheckIndex ()) + { + ICPU.S9xOpcodes = S9xOpcodesM0X1; + } + else + { + ICPU.S9xOpcodes = S9xOpcodesM0X0; + } + } +} + +STATIC inline void S9xReschedule () +{ + uint8 which; + long max; + + if (CPU.WhichEvent == HBLANK_START_EVENT || + CPU.WhichEvent == HTIMER_AFTER_EVENT) + { + which = HBLANK_END_EVENT; + max = Settings.H_Max; + } + else + { + which = HBLANK_START_EVENT; + max = Settings.HBlankStart; + } + + if (PPU.HTimerEnabled && + (long) PPU.HTimerPosition < max && + (long) PPU.HTimerPosition > CPU.NextEvent && + (!PPU.VTimerEnabled || + (PPU.VTimerEnabled && CPU.V_Counter == PPU.IRQVBeamPos))) + { + which = (long) PPU.HTimerPosition < Settings.HBlankStart ? + HTIMER_BEFORE_EVENT : HTIMER_AFTER_EVENT; + max = PPU.HTimerPosition; + } + CPU.NextEvent = max; + CPU.WhichEvent = which; +} + +#endif + -- cgit v1.2.3