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system.h
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//
// Copyright (c) 2004 K. Wilkins
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from
// the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
// be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
//////////////////////////////////////////////////////////////////////////////
// Handy - An Atari Lynx Emulator //
// Copyright (c) 1996,1997 //
// K. Wilkins //
//////////////////////////////////////////////////////////////////////////////
// System object header file //
//////////////////////////////////////////////////////////////////////////////
// //
// This header file provides the interface definition and inline code for //
// the system object, this object if what binds together all of the Handy //
// hardware enmulation objects, its the glue that holds the system together //
// //
// K. Wilkins //
// August 1997 //
// //
//////////////////////////////////////////////////////////////////////////////
// Revision History: //
// ----------------- //
// //
// 01Aug1997 KW Document header added & class documented. //
// //
//////////////////////////////////////////////////////////////////////////////
#ifndef SYSTEM_H
#define SYSTEM_H
#include "machine.h"
#include <string>
#include <algorithm>
#define HANDY_SYSTEM_FREQ 16000000
#define HANDY_TIMER_FREQ 20
#define HANDY_FILETYPE_LNX 0
#define HANDY_FILETYPE_HOMEBREW 1
#define HANDY_FILETYPE_SNAPSHOT 2
#define HANDY_FILETYPE_ILLEGAL 3
#define HANDY_SCREEN_WIDTH 160
#define HANDY_SCREEN_HEIGHT 102
//
// Define the global variable list
//
/*
#ifdef SYSTEM_CPP
uint32 gSuzieDoneTime = 0;
uint32 gSystemCycleCount=0;
uint32 gNextTimerEvent=0;
uint32 gCPUBootAddress=0;
uint32 gSystemIRQ=FALSE;
uint32 gSystemNMI=FALSE;
uint32 gSystemCPUSleep=FALSE;
uint32 gSystemHalt=FALSE;
#else
extern uint32 gSystemCycleCount;
extern uint32 gSuzieDoneTime;
extern uint32 gNextTimerEvent;
extern uint32 gCPUBootAddress;
extern uint32 gSystemIRQ;
extern uint32 gSystemNMI;
extern uint32 gSystemCPUSleep;
extern uint32 gSystemHalt;
#endif
*/
//
// Define the interfaces before we start pulling in the classes
// as many classes look for articles from the interfaces to
// allow compilation
#include "sysbase.h"
class CSystem;
//
// Now pull in the parts that build the system
//
#include "lynxbase.h"
#include "ram.h"
#include "rom.h"
#include "memmap.h"
#include "cart.h"
#include "susie.h"
#include "mikie.h"
#include "c65c02.h"
#define TOP_START 0xfc00
#define TOP_MASK 0x03ff
#define TOP_SIZE 0x400
#define SYSTEM_SIZE 65536
class CSystem : public CSystemBase
{
public:
CSystem(const uint8 *, uint32, const uint8*, uint32, int, int, bool) MDFN_COLD;
~CSystem() MDFN_COLD;
public:
void Reset() MDFN_COLD;
inline void Update(uint32 targetclock)
{
// Only update if there is a predicted timer event
if(gSystemCycleCount >= gNextTimerEvent)
{
mMikie->Update();
}
// Step the processor through 1 instruction
mCpu->Update();
// If the CPU is asleep then skip to the next timer event
if(gSystemCPUSleep)
{
gSystemCycleCount = std::min(gNextTimerEvent, targetclock);
}
}
void Blit(const uint32 *src);
bool Advance(int buttons, uint32 *vbuff, int16 *sbuff, int &sbuffsize);
bool GetSaveRamPtr(int &size, uint8 *&data) { return mCart->GetSaveRamPtr(size, data); }
void GetReadOnlyCartPtrs(int &s0, uint8 *&p0, int &s1, uint8 *&p1) { mCart->GetReadOnlyPtrs(s0, p0, s1, p1); }
//
// We MUST have separate CPU & RAM peek & poke handlers as all CPU accesses must
// go thru the address generator at $FFF9
//
// BUT, Mikie video refresh & Susie see the whole system as RAM
//
// Complete and utter wankers, its taken me 1 week to find the 2 lines
// in all the documentation that mention this fact, the mother of all
// bugs has been found and FIXED.......
// CPU
inline void Poke_CPU(uint32 addr, uint8 data) { mMemoryHandlers[addr]->Poke(addr,data);};
inline uint8 Peek_CPU(uint32 addr) { return mMemoryHandlers[addr]->Peek(addr);};
inline void PokeW_CPU(uint32 addr,uint16 data) { mMemoryHandlers[addr]->Poke(addr,data&0xff);addr++;mMemoryHandlers[addr]->Poke(addr,data>>8);};
inline uint16 PeekW_CPU(uint32 addr) {return ((mMemoryHandlers[addr]->Peek(addr))+(mMemoryHandlers[addr]->Peek(addr+1)<<8));};
// RAM
inline void Poke_RAM(uint32 addr, uint8 data) { mRam->Poke(addr,data);};
inline uint8 Peek_RAM(uint32 addr) { return mRam->Peek(addr);};
inline void PokeW_RAM(uint32 addr,uint16 data) { mRam->Poke(addr,data&0xff);addr++;mRam->Poke(addr,data>>8);};
inline uint16 PeekW_RAM(uint32 addr) {return ((mRam->Peek(addr))+(mRam->Peek(addr+1)<<8));};
// High level cart access for debug etc
inline void Poke_CART(uint32 addr, uint8 data) {mCart->Poke(addr,data);};
inline uint8 Peek_CART(uint32 addr) {return mCart->Peek(addr);};
inline void CartBank(EMMODE bank) {mCart->BankSelect(bank);};
inline uint32 CartSize() {return mCart->ObjectSize();};
// Low level cart access for Suzy, Mikey
inline void Poke_CARTB0(uint8 data) {mCart->Poke0(data);};
inline void Poke_CARTB1(uint8 data) {mCart->Poke1(data);};
inline uint8 Peek_CARTB0() {return mCart->Peek0();}
inline uint8 Peek_CARTB1() {return mCart->Peek1();}
inline void CartAddressStrobe(bool strobe) {mCart->CartAddressStrobe(strobe);};
inline void CartAddressData(bool data) {mCart->CartAddressData(data);};
// Low level CPU access
void SetRegs(C6502_REGS ®s) {mCpu->SetRegs(regs);};
void GetRegs(C6502_REGS ®s) {mCpu->GetRegs(regs);};
// Mikey system interfacing
void ComLynxCable(int status) { mMikie->ComLynxCable(status); };
void ComLynxRxData(int data) { mMikie->ComLynxRxData(data); };
void ComLynxTxCallback(void (*function)(int data,uint32 objref),uint32 objref) { mMikie->ComLynxTxCallback(function,objref); };
// Suzy system interfacing
uint32 PaintSprites() {return mSusie->PaintSprites();};
// Miscellaneous
void SetButtonData(uint32 data);
// uint32 GetButtonData() {return mSusie->GetButtonData();};
uint8* GetRamPointer() {return mRam->GetRamPointer();};
public:
CLynxBase *mMemoryHandlers[SYSTEM_SIZE];
CCart *mCart;
CRom *mRom;
CMemMap *mMemMap;
CRam *mRam;
C65C02 *mCpu;
CMikie *mMikie;
CSusie *mSusie;
// old globals
uint32 gSuzieDoneTime;
uint32 gSystemCycleCount;
uint32 gNextTimerEvent;
uint32 gSystemIRQ;
uint32 gSystemNMI;
uint32 gSystemCPUSleep;
uint32 gSystemHalt; // this is set in various places, but never tested, anywhere?
// frame overflow detection
int frameoverflow;
// rotation of the device
int rotate;
// video dest
uint32 *videobuffer;
template<bool isReader>void SyncState(NewState *ns);
};
#endif