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emulate DMA timings.

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keeps games from overflowing the GXFIFO... when they aren't fucking dumb.
This commit is contained in:
StapleButter
2017-02-17 05:33:37 +01:00
parent abd2cb444b
commit cca0a71d81
7 changed files with 176 additions and 34 deletions
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58
NDS.cpp
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@ -54,6 +54,8 @@ s32 ARM7Offset;
SchedEvent SchedList[Event_MAX];
u32 SchedListMask;
u32 CPUStop;
u8 ARM9BIOS[0x1000];
u8 ARM7BIOS[0x4000];
@ -278,6 +280,8 @@ void Reset()
ARM7->Reset();
CP15::Reset();
CPUStop = 0;
memset(Timers, 0, 8*sizeof(Timer));
for (i = 0; i < 8; i++) DMAs[i]->Reset();
@ -307,7 +311,7 @@ void Reset()
// test
//LoadROM();
//LoadFirmware();
if (NDSCart::LoadROM("rom/nsmb.nds"))
if (NDSCart::LoadROM("rom/raving.nds"))
Running = true; // hax
}
@ -364,17 +368,45 @@ void RunFrame()
while (Running && framecycles>0)
{
CalcIterationCycles();
ARM9->CyclesToRun = CurIterationCycles << 1;
ARM9->Execute();
s32 ndscyclestorun = ARM9->Cycles >> 1;
s32 ndscyclestorun;
s32 ndscycles = 0;
ARM7->CyclesToRun = ndscyclestorun - ARM7Offset;
ARM7->Execute();
ARM7Offset = ARM7->Cycles - ARM7->CyclesToRun;
CalcIterationCycles();
if (CPUStop & 0x1)
{
s32 cycles = CurIterationCycles;
cycles = DMAs[0]->Run(cycles);
if (cycles > 0) cycles = DMAs[1]->Run(cycles);
if (cycles > 0) cycles = DMAs[2]->Run(cycles);
if (cycles > 0) cycles = DMAs[3]->Run(cycles);
ndscyclestorun = CurIterationCycles - cycles;
// TODO: run other timing critical shit, like timers
GPU3D::Run(ndscyclestorun);
}
else
{
ARM9->CyclesToRun = CurIterationCycles << 1;
ARM9->Execute();
ndscyclestorun = ARM9->Cycles >> 1;
}
if (CPUStop & 0x2)
{
s32 cycles = ndscyclestorun - ARM7Offset;
cycles = DMAs[4]->Run(cycles);
if (cycles > 0) cycles = DMAs[5]->Run(cycles);
if (cycles > 0) cycles = DMAs[6]->Run(cycles);
if (cycles > 0) cycles = DMAs[7]->Run(cycles);
ARM7Offset = cycles;
}
else
{
ARM7->CyclesToRun = ndscyclestorun - ARM7Offset;
ARM7->Execute();
ARM7Offset = ARM7->Cycles - ARM7->CyclesToRun;
}
RunSystem(ndscyclestorun);
//GPU3D::Run(ndscyclestorun);
@ -520,6 +552,12 @@ bool HaltInterrupted(u32 cpu)
return false;
}
void StopCPU(u32 cpu, bool stop)
{
if (stop) CPUStop |= (1<<cpu);
else CPUStop &= ~(1<<cpu);
}
void CheckDMAs(u32 cpu, u32 mode)