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e0a34d4066
frodo-wii/Src/C64.cpp
simon.kagstrom e0a34d4066 All changes so far
2008-12-31 16:20:47 +00:00

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/*
* C64.cpp - Put the pieces together
*
* Frodo (C) 1994-1997,2002 Christian Bauer
*/
#include "sysdeps.h"
#include "C64.h"
#include "CPUC64.h"
#include "CPU1541.h"
#include "VIC.h"
#include "SID.h"
#include "CIA.h"
#include "REU.h"
#include "IEC.h"
#include "1541job.h"
#include "Display.h"
#include "Prefs.h"
#if defined(__unix) && !defined(__svgalib__) && !defined(HAVE_SDL)
#include "CmdPipe.h"
#endif
#ifdef FRODO_SC
bool IsFrodoSC = true;
#else
bool IsFrodoSC = false;
#endif
/*
* Constructor: Allocate objects and memory
*/
C64::C64()
{
int i,j;
uint8 *p;
// The thread is not yet running
thread_running = false;
quit_thyself = false;
have_a_break = false;
// System-dependent things
c64_ctor1();
// Open display
TheDisplay = new C64Display(this);
// Allocate RAM/ROM memory
RAM = new uint8[0x10000];
Basic = new uint8[0x2000];
Kernal = new uint8[0x2000];
Char = new uint8[0x1000];
Color = new uint8[0x0400];
RAM1541 = new uint8[0x0800];
ROM1541 = new uint8[0x4000];
// Create the chips
TheCPU = new MOS6510(this, RAM, Basic, Kernal, Char, Color);
TheJob1541 = new Job1541(RAM1541);
TheCPU1541 = new MOS6502_1541(this, TheJob1541, TheDisplay, RAM1541, ROM1541);
TheVIC = TheCPU->TheVIC = new MOS6569(this, TheDisplay, TheCPU, RAM, Char, Color);
TheSID = TheCPU->TheSID = new MOS6581(this);
TheCIA1 = TheCPU->TheCIA1 = new MOS6526_1(TheCPU, TheVIC);
TheCIA2 = TheCPU->TheCIA2 = TheCPU1541->TheCIA2 = new MOS6526_2(TheCPU, TheVIC, TheCPU1541);
TheIEC = TheCPU->TheIEC = new IEC(TheDisplay);
TheREU = TheCPU->TheREU = new REU(TheCPU);
// Initialize RAM with powerup pattern
for (i=0, p=RAM; i<512; i++) {
for (j=0; j<64; j++)
*p++ = 0;
for (j=0; j<64; j++)
*p++ = 0xff;
}
// Initialize color RAM with random values
for (i=0, p=Color; i<1024; i++)
*p++ = rand() & 0x0f;
// Clear 1541 RAM
memset(RAM1541, 0, 0x800);
// Open joystick drivers if required
open_close_joysticks(false, false, ThePrefs.Joystick1On, ThePrefs.Joystick2On);
joykey = 0xff;
#ifdef FRODO_SC
CycleCounter = 0;
#endif
// System-dependent things
c64_ctor2();
}
/*
* Destructor: Delete all objects
*/
C64::~C64()
{
open_close_joysticks(ThePrefs.Joystick1On, ThePrefs.Joystick2On, false, false);
delete TheJob1541;
delete TheREU;
delete TheIEC;
delete TheCIA2;
delete TheCIA1;
delete TheSID;
delete TheVIC;
delete TheCPU1541;
delete TheCPU;
delete TheDisplay;
delete[] RAM;
delete[] Basic;
delete[] Kernal;
delete[] Char;
delete[] Color;
delete[] RAM1541;
delete[] ROM1541;
c64_dtor();
}
/*
* Reset C64
*/
void C64::Reset(void)
{
TheCPU->AsyncReset();
TheCPU1541->AsyncReset();
TheSID->Reset();
TheCIA1->Reset();
TheCIA2->Reset();
TheIEC->Reset();
}
/*
* NMI C64
*/
void C64::NMI(void)
{
TheCPU->AsyncNMI();
}
/*
* The preferences have changed. prefs is a pointer to the new
* preferences, ThePrefs still holds the previous ones.
* The emulation must be in the paused state!
*/
void C64::NewPrefs(Prefs *prefs)
{
open_close_joysticks(ThePrefs.Joystick1On, ThePrefs.Joystick2On, prefs->Joystick1On, prefs->Joystick2On);
PatchKernal(prefs->FastReset, prefs->Emul1541Proc);
TheDisplay->NewPrefs(prefs);
#ifdef __riscos__
// Changed order of calls. If 1541 mode hasn't changed the order is insignificant.
if (prefs->Emul1541Proc) {
// New prefs have 1541 enabled ==> if old prefs had disabled free drives FIRST
TheIEC->NewPrefs(prefs);
TheJob1541->NewPrefs(prefs);
} else {
// New prefs has 1541 disabled ==> if old prefs had enabled free job FIRST
TheJob1541->NewPrefs(prefs);
TheIEC->NewPrefs(prefs);
}
#else
TheIEC->NewPrefs(prefs);
TheJob1541->NewPrefs(prefs);
#endif
TheREU->NewPrefs(prefs);
TheSID->NewPrefs(prefs);
// Reset 1541 processor if turned on
if (!ThePrefs.Emul1541Proc && prefs->Emul1541Proc)
TheCPU1541->AsyncReset();
}
/*
* Patch kernal IEC routines
*/
void C64::PatchKernal(bool fast_reset, bool emul_1541_proc)
{
if (fast_reset) {
Kernal[0x1d84] = 0xa0;
Kernal[0x1d85] = 0x00;
} else {
Kernal[0x1d84] = orig_kernal_1d84;
Kernal[0x1d85] = orig_kernal_1d85;
}
if (emul_1541_proc) {
Kernal[0x0d40] = 0x78;
Kernal[0x0d41] = 0x20;
Kernal[0x0d23] = 0x78;
Kernal[0x0d24] = 0x20;
Kernal[0x0d36] = 0x78;
Kernal[0x0d37] = 0x20;
Kernal[0x0e13] = 0x78;
Kernal[0x0e14] = 0xa9;
Kernal[0x0def] = 0x78;
Kernal[0x0df0] = 0x20;
Kernal[0x0dbe] = 0xad;
Kernal[0x0dbf] = 0x00;
Kernal[0x0dcc] = 0x78;
Kernal[0x0dcd] = 0x20;
Kernal[0x0e03] = 0x20;
Kernal[0x0e04] = 0xbe;
} else {
Kernal[0x0d40] = 0xf2; // IECOut
Kernal[0x0d41] = 0x00;
Kernal[0x0d23] = 0xf2; // IECOutATN
Kernal[0x0d24] = 0x01;
Kernal[0x0d36] = 0xf2; // IECOutSec
Kernal[0x0d37] = 0x02;
Kernal[0x0e13] = 0xf2; // IECIn
Kernal[0x0e14] = 0x03;
Kernal[0x0def] = 0xf2; // IECSetATN
Kernal[0x0df0] = 0x04;
Kernal[0x0dbe] = 0xf2; // IECRelATN
Kernal[0x0dbf] = 0x05;
Kernal[0x0dcc] = 0xf2; // IECTurnaround
Kernal[0x0dcd] = 0x06;
Kernal[0x0e03] = 0xf2; // IECRelease
Kernal[0x0e04] = 0x07;
}
// 1541
ROM1541[0x2ae4] = 0xea; // Don't check ROM checksum
ROM1541[0x2ae5] = 0xea;
ROM1541[0x2ae8] = 0xea;
ROM1541[0x2ae9] = 0xea;
ROM1541[0x2c9b] = 0xf2; // DOS idle loop
ROM1541[0x2c9c] = 0x00;
ROM1541[0x3594] = 0x20; // Write sector
ROM1541[0x3595] = 0xf2;
ROM1541[0x3596] = 0xf5;
ROM1541[0x3597] = 0xf2;
ROM1541[0x3598] = 0x01;
ROM1541[0x3b0c] = 0xf2; // Format track
ROM1541[0x3b0d] = 0x02;
}
/*
* Save RAM contents
*/
void C64::SaveRAM(char *filename)
{
FILE *f;
if ((f = fopen(filename, "wb")) == NULL)
ShowRequester("RAM save failed.", "OK", NULL);
else {
fwrite((void*)RAM, 1, 0x10000, f);
fwrite((void*)Color, 1, 0x400, f);
if (ThePrefs.Emul1541Proc)
fwrite((void*)RAM1541, 1, 0x800, f);
fclose(f);
}
}
/*
* Save CPU state to snapshot
*
* 0: Error
* 1: OK
* -1: Instruction not completed
*/
int C64::SaveCPUState(FILE *f)
{
MOS6510State state;
TheCPU->GetState(&state);
if (!state.instruction_complete)
return -1;
int i = fwrite(RAM, 0x10000, 1, f);
i += fwrite(Color, 0x400, 1, f);
i += fwrite((void*)&state, sizeof(state), 1, f);
return i == 3;
}
/*
* Load CPU state from snapshot
*/
bool C64::LoadCPUState(FILE *f)
{
MOS6510State state;
int i = fread(RAM, 0x10000, 1, f);
i += fread(Color, 0x400, 1, f);
i += fread((void*)&state, sizeof(state), 1, f);
if (i == 3) {
TheCPU->SetState(&state);
return true;
} else
return false;
}
/*
* Save 1541 state to snapshot
*
* 0: Error
* 1: OK
* -1: Instruction not completed
*/
int C64::Save1541State(FILE *f)
{
MOS6502State state;
TheCPU1541->GetState(&state);
if (!state.idle && !state.instruction_complete)
return -1;
int i = fwrite(RAM1541, 0x800, 1, f);
i += fwrite((void*)&state, sizeof(state), 1, f);
return i == 2;
}
/*
* Load 1541 state from snapshot
*/
bool C64::Load1541State(FILE *f)
{
MOS6502State state;
int i = fread(RAM1541, 0x800, 1, f);
i += fread((void*)&state, sizeof(state), 1, f);
if (i == 2) {
TheCPU1541->SetState(&state);
return true;
} else
return false;
}
/*
* Save VIC state to snapshot
*/
bool C64::SaveVICState(FILE *f)
{
MOS6569State state;
TheVIC->GetState(&state);
return fwrite((void*)&state, sizeof(state), 1, f) == 1;
}
/*
* Load VIC state from snapshot
*/
bool C64::LoadVICState(FILE *f)
{
MOS6569State state;
if (fread((void*)&state, sizeof(state), 1, f) == 1) {
TheVIC->SetState(&state);
return true;
} else
return false;
}
/*
* Save SID state to snapshot
*/
bool C64::SaveSIDState(FILE *f)
{
MOS6581State state;
TheSID->GetState(&state);
return fwrite((void*)&state, sizeof(state), 1, f) == 1;
}
/*
* Load SID state from snapshot
*/
bool C64::LoadSIDState(FILE *f)
{
MOS6581State state;
if (fread((void*)&state, sizeof(state), 1, f) == 1) {
TheSID->SetState(&state);
return true;
} else
return false;
}
/*
* Save CIA states to snapshot
*/
bool C64::SaveCIAState(FILE *f)
{
MOS6526State state;
TheCIA1->GetState(&state);
if (fwrite((void*)&state, sizeof(state), 1, f) == 1) {
TheCIA2->GetState(&state);
return fwrite((void*)&state, sizeof(state), 1, f) == 1;
} else
return false;
}
/*
* Load CIA states from snapshot
*/
bool C64::LoadCIAState(FILE *f)
{
MOS6526State state;
if (fread((void*)&state, sizeof(state), 1, f) == 1) {
TheCIA1->SetState(&state);
if (fread((void*)&state, sizeof(state), 1, f) == 1) {
TheCIA2->SetState(&state);
return true;
} else
return false;
} else
return false;
}
/*
* Save 1541 GCR state to snapshot
*/
bool C64::Save1541JobState(FILE *f)
{
Job1541State state;
TheJob1541->GetState(&state);
return fwrite((void*)&state, sizeof(state), 1, f) == 1;
}
/*
* Load 1541 GCR state from snapshot
*/
bool C64::Load1541JobState(FILE *f)
{
Job1541State state;
if (fread((void*)&state, sizeof(state), 1, f) == 1) {
TheJob1541->SetState(&state);
return true;
} else
return false;
}
#define SNAPSHOT_HEADER "FrodoSnapshot"
#define SNAPSHOT_1541 1
#define ADVANCE_CYCLES \
TheVIC->EmulateCycle(); \
TheCIA1->EmulateCycle(); \
TheCIA2->EmulateCycle(); \
TheCPU->EmulateCycle(); \
if (ThePrefs.Emul1541Proc) { \
TheCPU1541->CountVIATimers(1); \
if (!TheCPU1541->Idle) \
TheCPU1541->EmulateCycle(); \
}
/*
* Save snapshot (emulation must be paused and in VBlank)
*
* To be able to use SC snapshots with SL, SC snapshots are made thus that no
* partially dealt with instructions are saved. Instead all devices are advanced
* cycle by cycle until the current instruction has been finished. The number of
* cycles this takes is saved in the snapshot and will be reconstructed if the
* snapshot is loaded into FrodoSC again.
*/
void C64::SaveSnapshot(char *filename)
{
FILE *f;
uint8 flags;
uint8 delay;
int stat;
if ((f = fopen(filename, "wb")) == NULL) {
ShowRequester("Unable to open snapshot file", "OK", NULL);
return;
}
fprintf(f, "%s%c", SNAPSHOT_HEADER, 10);
fputc(0, f); // Version number 0
flags = 0;
if (ThePrefs.Emul1541Proc)
flags |= SNAPSHOT_1541;
fputc(flags, f);
SaveVICState(f);
SaveSIDState(f);
SaveCIAState(f);
#ifdef FRODO_SC
delay = 0;
do {
if ((stat = SaveCPUState(f)) == -1) { // -1 -> Instruction not finished yet
ADVANCE_CYCLES; // Advance everything by one cycle
delay++;
}
} while (stat == -1);
fputc(delay, f); // Number of cycles the saved CPUC64 lags behind the previous chips
#else
SaveCPUState(f);
fputc(0, f); // No delay
#endif
if (ThePrefs.Emul1541Proc) {
fwrite(ThePrefs.DrivePath[0], 256, 1, f);
#ifdef FRODO_SC
delay = 0;
do {
if ((stat = Save1541State(f)) == -1) {
ADVANCE_CYCLES;
delay++;
}
} while (stat == -1);
fputc(delay, f);
#else
Save1541State(f);
fputc(0, f); // No delay
#endif
Save1541JobState(f);
}
fclose(f);
#ifdef __riscos__
TheWIMP->SnapshotSaved(true);
#endif
}
/*
* Load snapshot (emulation must be paused and in VBlank)
*/
bool C64::LoadSnapshot(char *filename)
{
FILE *f;
if ((f = fopen(filename, "rb")) != NULL) {
char Header[] = SNAPSHOT_HEADER;
char *b = Header, c = 0;
uint8 delay, i;
// For some reason memcmp()/strcmp() and so forth utterly fail here.
while (*b > 32) {
if ((c = fgetc(f)) != *b++) {
b = NULL;
break;
}
}
if (b != NULL) {
uint8 flags;
bool error = false;
#ifndef FRODO_SC
long vicptr; // File offset of VIC data
#endif
while (c != 10)
c = fgetc(f); // Shouldn't be necessary
if (fgetc(f) != 0) {
ShowRequester("Unknown snapshot format", "OK", NULL);
fclose(f);
return false;
}
flags = fgetc(f);
#ifndef FRODO_SC
vicptr = ftell(f);
#endif
error |= !LoadVICState(f);
error |= !LoadSIDState(f);
error |= !LoadCIAState(f);
error |= !LoadCPUState(f);
delay = fgetc(f); // Number of cycles the 6510 is ahead of the previous chips
#ifdef FRODO_SC
// Make the other chips "catch up" with the 6510
for (i=0; i<delay; i++) {
TheVIC->EmulateCycle();
TheCIA1->EmulateCycle();
TheCIA2->EmulateCycle();
}
#endif
if ((flags & SNAPSHOT_1541) != 0) {
Prefs *prefs = new Prefs(ThePrefs);
// First switch on emulation
error |= (fread(prefs->DrivePath[0], 256, 1, f) != 1);
prefs->Emul1541Proc = true;
NewPrefs(prefs);
ThePrefs = *prefs;
delete prefs;
// Then read the context
error |= !Load1541State(f);
delay = fgetc(f); // Number of cycles the 6502 is ahead of the previous chips
#ifdef FRODO_SC
// Make the other chips "catch up" with the 6502
for (i=0; i<delay; i++) {
TheVIC->EmulateCycle();
TheCIA1->EmulateCycle();
TheCIA2->EmulateCycle();
TheCPU->EmulateCycle();
}
#endif
Load1541JobState(f);
#ifdef __riscos__
TheWIMP->ThePrefsToWindow();
#endif
} else if (ThePrefs.Emul1541Proc) { // No emulation in snapshot, but currently active?
Prefs *prefs = new Prefs(ThePrefs);
prefs->Emul1541Proc = false;
NewPrefs(prefs);
ThePrefs = *prefs;
delete prefs;
#ifdef __riscos__
TheWIMP->ThePrefsToWindow();
#endif
}
#ifndef FRODO_SC
fseek(f, vicptr, SEEK_SET);
LoadVICState(f); // Load VIC data twice in SL (is REALLY necessary sometimes!)
#endif
fclose(f);
if (error) {
ShowRequester("Error reading snapshot file", "OK", NULL);
Reset();
return false;
} else
return true;
} else {
fclose(f);
ShowRequester("Not a Frodo snapshot file", "OK", NULL);
return false;
}
} else {
ShowRequester("Can't open snapshot file", "OK", NULL);
return false;
}
}
#ifdef __BEOS__
#include "C64_Be.i"
#endif
#ifdef AMIGA
#include "C64_Amiga.i"
#endif
#ifdef HAVE_SDL
#include "C64_SDL.i"
#endif
#ifdef __mac__
#include "C64_mac.i"
#endif
#ifdef WIN32
#include "C64_WIN32.i"
#endif
#ifdef __riscos__
#include "C64_Acorn.i"
#endif
#ifdef GEKKO
#include "C64_wii.i"
#endif
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