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Supermodel/Src/CPU/PowerPC/ppc603.c
Nik Henson 183dca563d Committing various small updates that have been hanging around in my source tree for a while now: 
- Added 'crosshairs' command line and config option.
- Added 'vsync' command line and config option (so far only tested on NVidia cards on Windows 7 - other graphics drivers, O/Ss or driver settings may simply chose to ignore this).
- Added fullscreen toggle within game using Alt+Enter key combination.
- Added framework for lamp outputs and 'outputs' command line and config option.  So far only the lamps for driving games are hooked up in the emulator (others to be added later).
- Added an initial outputs implementation for Windows that sends MAMEHooker compatible messages (-outputs=win to enable)
- Fixed fps calculation in Main.cpp that was producing incorrect results and so giving the impression that frame throttling wasn't working properly when in fact it was.
- Fixed palette indexed colours as the index was always off by one, causing incorrect colours in various games, eg drivers' suits and flashing Start sign in Daytona 2.
- Altered caching of models so that models with palette indexed colours use the dynamic cache rather than the static one.  This is so that changes in palette indexed colours appear on screen, eg the flashing Start sign on the advanced course of Daytona 2 (although currently the START message itself is not visible due to other problems with texture decoding).
- Fixed small bug in TileGen.cpp which meant both palettes were being completely recomputed pretty much with every frame.  This was a significant performance hit, particularly as palette recomputation is currently being done in SyncSnapshots (it should be moved out of here at some point, although for now it's no big deal).
- Made sure all OpenGL objects and resources are deleted in Render2D/3D destructors, in particular the deleting of the VBO buffer in DestroyModelCache.
- Made sure that GLSL uniforms are always checked to see if they are bound before using them in order to stop unecessary (but harmless) GL errors.
- Altered the default texture sheet handling to use a single large GL texture holding multiple Model3 texture sheets rather than multiple GL textures as before (if required, the old behaviour can still be selected with the mulisheet fragment shader).  I believe this fixes the disappearing crosshairs/corrupt GL state problem which the multisheet fragment shader seemed to be triggering somehow.
- Fixed a bug in debugger which meant memory watches were not triggering properly
2012-07-15 21:04:46 +00:00

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/**
** Supermodel
** A Sega Model 3 Arcade Emulator.
** Copyright 2011 Bart Trzynadlowski, Nik Henson
**
** This file is part of Supermodel.
**
** Supermodel is free software: you can redistribute it and/or modify it under
** the terms of the GNU General Public License as published by the Free
** Software Foundation, either version 3 of the License, or (at your option)
** any later version.
**
** Supermodel is distributed in the hope that it will be useful, but WITHOUT
** ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
** FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
** more details.
**
** You should have received a copy of the GNU General Public License along
** with Supermodel. If not, see <http://www.gnu.org/licenses/>.
**/
/*
* ppc603.c
*
* PowerPC 603e functions. Included from ppc.cpp; do not compile separately.
*/
void ppc603_exception(int exception)
{
#ifdef SUPERMODEL_DEBUGGER
if (PPCDebug != NULL)
PPCDebug->CPUException(exception);
#endif
switch( exception )
{
case EXCEPTION_IRQ: /* External Interrupt */
if( ppc_get_msr() & MSR_EE ) {
UINT32 msr = ppc_get_msr();
SRR0 = ppc.npc;
SRR1 = msr & 0xff73;
msr &= ~(MSR_POW | MSR_EE | MSR_PR | MSR_FP | MSR_FE0 | MSR_SE | MSR_BE | MSR_FE1 | MSR_IR | MSR_DR | MSR_RI);
if( msr & MSR_ILE )
msr |= MSR_LE;
else
msr &= ~MSR_LE;
ppc_set_msr(msr);
if( msr & MSR_IP )
ppc.npc = 0xfff00000 | 0x0500;
else
ppc.npc = 0x00000000 | 0x0500;
ppc.interrupt_pending &= ~0x1;
ppc_change_pc(ppc.npc);
}
break;
case EXCEPTION_DECREMENTER: /* Decrementer overflow exception */
if( ppc_get_msr() & MSR_EE ) {
UINT32 msr = ppc_get_msr();
SRR0 = ppc.npc;
SRR1 = msr & 0xff73;
msr &= ~(MSR_POW | MSR_EE | MSR_PR | MSR_FP | MSR_FE0 | MSR_SE | MSR_BE | MSR_FE1 | MSR_IR | MSR_DR | MSR_RI);
if( msr & MSR_ILE )
msr |= MSR_LE;
else
msr &= ~MSR_LE;
ppc_set_msr(msr);
if( msr & MSR_IP )
ppc.npc = 0xfff00000 | 0x0900;
else
ppc.npc = 0x00000000 | 0x0900;
ppc.interrupt_pending &= ~0x2;
ppc_change_pc(ppc.npc);
}
break;
case EXCEPTION_TRAP: /* Program exception / Trap */
{
UINT32 msr = ppc_get_msr();
SRR0 = ppc.pc;
SRR1 = (msr & 0xff73) | 0x20000; /* 0x20000 = TRAP bit */
msr &= ~(MSR_POW | MSR_EE | MSR_PR | MSR_FP | MSR_FE0 | MSR_SE | MSR_BE | MSR_FE1 | MSR_IR | MSR_DR | MSR_RI);
if( msr & MSR_ILE )
msr |= MSR_LE;
else
msr &= ~MSR_LE;
ppc_set_msr(msr);
if( msr & MSR_IP )
ppc.npc = 0xfff00000 | 0x0700;
else
ppc.npc = 0x00000000 | 0x0700;
ppc_change_pc(ppc.npc);
}
break;
case EXCEPTION_SYSTEM_CALL: /* System call */
{
UINT32 msr = ppc_get_msr();
SRR0 = ppc.npc;
SRR1 = (msr & 0xff73);
msr &= ~(MSR_POW | MSR_EE | MSR_PR | MSR_FP | MSR_FE0 | MSR_SE | MSR_BE | MSR_FE1 | MSR_IR | MSR_DR | MSR_RI);
if( msr & MSR_ILE )
msr |= MSR_LE;
else
msr &= ~MSR_LE;
ppc_set_msr(msr);
if( msr & MSR_IP )
ppc.npc = 0xfff00000 | 0x0c00;
else
ppc.npc = 0x00000000 | 0x0c00;
ppc_change_pc(ppc.npc);
}
break;
case EXCEPTION_SMI:
if( ppc_get_msr() & MSR_EE ) {
UINT32 msr = ppc_get_msr();
SRR0 = ppc.npc;
SRR1 = msr & 0xff73;
msr &= ~(MSR_POW | MSR_EE | MSR_PR | MSR_FP | MSR_FE0 | MSR_SE | MSR_BE | MSR_FE1 | MSR_IR | MSR_DR | MSR_RI);
if( msr & MSR_ILE )
msr |= MSR_LE;
else
msr &= ~MSR_LE;
ppc_set_msr(msr);
if( msr & MSR_IP )
ppc.npc = 0xfff00000 | 0x1400;
else
ppc.npc = 0x00000000 | 0x1400;
ppc.interrupt_pending &= ~0x4;
ppc_change_pc(ppc.npc);
}
break;
case EXCEPTION_DSI:
{
UINT32 msr = ppc_get_msr();
SRR0 = ppc.npc;
SRR1 = msr & 0xff73;
msr &= ~(MSR_POW | MSR_EE | MSR_PR | MSR_FP | MSR_FE0 | MSR_SE | MSR_BE | MSR_FE1 | MSR_IR | MSR_DR | MSR_RI);
if( msr & MSR_ILE )
msr |= MSR_LE;
else
msr &= ~MSR_LE;
ppc_set_msr(msr);
if( msr & MSR_IP )
ppc.npc = 0xfff00000 | 0x0300;
else
ppc.npc = 0x00000000 | 0x0300;
ppc.interrupt_pending &= ~0x4;
ppc_change_pc(ppc.npc);
}
break;
case EXCEPTION_ISI:
{
UINT32 msr = ppc_get_msr();
SRR0 = ppc.npc;
SRR1 = msr & 0xff73;
msr &= ~(MSR_POW | MSR_EE | MSR_PR | MSR_FP | MSR_FE0 | MSR_SE | MSR_BE | MSR_FE1 | MSR_IR | MSR_DR | MSR_RI);
if( msr & MSR_ILE )
msr |= MSR_LE;
else
msr &= ~MSR_LE;
ppc_set_msr(msr);
if( msr & MSR_IP )
ppc.npc = 0xfff00000 | 0x0400;
else
ppc.npc = 0x00000000 | 0x0400;
ppc.interrupt_pending &= ~0x4;
ppc_change_pc(ppc.npc);
}
break;
default:
ErrorLog("PowerPC triggered an unknown exception. Emulation halted until reset.");
DebugLog("PowerPC triggered an unknown exception (%d).\n", exception);
ppc.fatalError = true;
break;
}
}
static void ppc603_set_smi_line(int state)
{
if( state ) {
ppc.interrupt_pending |= 0x4;
}
}
static void ppc603_check_interrupts(void)
{
if (MSR & MSR_EE)
{
if (ppc.interrupt_pending != 0)
{
if (ppc.interrupt_pending & 0x1)
{
ppc603_exception(EXCEPTION_IRQ);
}
else if (ppc.interrupt_pending & 0x2)
{
ppc603_exception(EXCEPTION_DECREMENTER);
}
else if (ppc.interrupt_pending & 0x4)
{
ppc603_exception(EXCEPTION_SMI);
}
}
}
}
void ppc_reset(void)
{
ppc.fatalError = false; // reset the fatal error flag
ppc.pc = ppc.npc = 0xfff00100;
ppc_set_msr(0x40);
ppc_change_pc(ppc.pc);
ppc.hid0 = 1;
ppc.interrupt_pending = 0;
ppc.tb = 0;
ppc.timer_frac = 0;
DEC = 0xffffffff;
ppc.total_cycles = 0;
ppc.cur_cycles = 0;
ppc.icount = 0;
}
int ppc_execute(int cycles)
{
UINT32 opcode;
ppc.cur_cycles = cycles;
ppc.icount = cycles;
ppc.tb_base_icount = cycles + ppc.timer_frac;
ppc.dec_base_icount = cycles + ppc.timer_frac;
// Check if decrementer exception occurs during execution (exception occurs after decrementer
// has passed through zero)
if ((UINT32)(ppc.dec_base_icount / ppc.timer_ratio) > DEC)
ppc.dec_trigger_cycle = ppc.dec_base_icount - ((1 + DEC) * ppc.timer_ratio);
else
ppc.dec_trigger_cycle = 0x7fffffff;
ppc_change_pc(ppc.npc);
/*{
char string1[200];
char string2[200];
opcode = BSWAP32(*ppc.op);
DisassemblePowerPC(opcode, ppc.npc, string1, string2, true);
printf("%08X: %s %s\n", ppc.npc, string1, string2);
}*/
ppc603_check_interrupts();
#ifdef SUPERMODEL_DEBUGGER
if (PPCDebug != NULL)
PPCDebug->CPUActive();
#endif // SUPERMODEL_DEBUGGER
while( ppc.icount > 0 && !ppc.fatalError)
{
ppc.pc = ppc.npc;
// Debug breakpoints
/*
if (ppc.pc == 0x9d40)
{
printf("%X R3=%08X R4=%08X\n", ppc.pc, REG(3), REG(4));
}
*/
opcode = *ppc.op++; // Supermodel byte reverses each aligned word (converting them to little endian) so they can be fetched directly
ppc.npc = ppc.pc + 4;
#ifdef SUPERMODEL_DEBUGGER
if (PPCDebug != NULL)
{
while (PPCDebug->CPUExecute(ppc.pc, opcode, (PPCDebug->instrCount > 0 ? 1 : 0)))
opcode = *ppc.op++;
}
#endif // SUPERMODEL_DEBUGGER
switch(opcode >> 26)
{
case 19: optable19[(opcode >> 1) & 0x3ff](opcode); break;
case 31: optable31[(opcode >> 1) & 0x3ff](opcode); break;
case 59: optable59[(opcode >> 1) & 0x3ff](opcode); break;
case 63: optable63[(opcode >> 1) & 0x3ff](opcode); break;
default: optable[opcode >> 26](opcode); break;
}
ppc.icount--;
if (ppc.icount == ppc.dec_trigger_cycle)
{
ppc.interrupt_pending |= 0x2;
ppc603_check_interrupts();
}
//ppc603_check_interrupts();
}
#ifdef SUPERMODEL_DEBUGGER
if (PPCDebug != NULL)
PPCDebug->CPUInactive();
#endif // SUPERMODEL_DEBUGGER
// Update timebase and decrementer. Both are updated at same rate as specified by timer_ratio.
ppc.timer_frac = ((ppc.tb_base_icount - ppc.icount) % ppc.timer_ratio);
ppc.tb += ((ppc.tb_base_icount - ppc.icount) / ppc.timer_ratio);
DEC -= ((ppc.dec_base_icount - ppc.icount) / ppc.timer_ratio);
/*
{
char string1[200];
char string2[200];
opcode = BSWAP32(*ppc.op);
DisassemblePowerPC(opcode, ppc.npc, string1, string2, true);
printf("%08X: %s %s\n", ppc.npc, string1, string2);
}
*/
int executed = cycles - ppc.icount;
ppc.total_cycles += executed;
ppc.cur_cycles = 0;
ppc.icount = 0;
ppc.tb_base_icount = 0;
ppc.dec_base_icount = 0;
return executed;
}
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