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melonDS
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well yeah that's what I thought 

GXFIFO stalls don't stall the ARM7
This commit is contained in:
StapleButter 2018-11-24 05:23:35 +01:00
parent 391c8d43b0
commit 46d5a31275
1 changed files with 29 additions and 14 deletions
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43
src/NDS.cpp
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@ -597,7 +597,7 @@ void RunSystem(s32 cycles)
}
}
}
int stallcnt=0, stallcycle=0;
u32 RunFrame()
{
if (!Running) return 263; // dorp
@ -615,7 +615,7 @@ u32 RunFrame()
// we just run the GPU and the timers.
// the rest of the hardware is driven by the event scheduler.
s32 cycles = GPU3D::CyclesToRunFor();stallcycle+=cycles;
s32 cycles = GPU3D::CyclesToRunFor();
GPU3D::Run(cycles);
u32 timermask = TimerCheckMask[0];
@ -623,21 +623,36 @@ u32 RunFrame()
if (timermask & 0x2) RunTimer(1, cycles);
if (timermask & 0x4) RunTimer(2, cycles);
if (timermask & 0x8) RunTimer(3, cycles);
timermask = TimerCheckMask[1];
if (timermask & 0x1) RunTimer(4, cycles);
if (timermask & 0x2) RunTimer(5, cycles);
if (timermask & 0x4) RunTimer(6, cycles);
if (timermask & 0x8) RunTimer(7, cycles);
// run system peripherals, step by step
// run ARM7 and system peripherals, step by step
// as to give the finer-grained ones a chance to reschedule properly
// in case we end up running a large chunk of GXFIFO commands
s32 syscyclesran = 0;
s32 ndscyclesran = 0;
s32 ndscyclestorun;
for (;;)
{
RunSystem(CurIterationCycles);
syscyclesran += CurIterationCycles;
if (syscyclesran >= cycles) break;
ndscyclestorun = std::min(CurIterationCycles, cycles);
if (CPUStop & 0x0FFF0000)
{
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;
CurCPU = 2; ARM7->Execute(); CurCPU = 0;
ARM7Offset = ARM7->Cycles - ARM7->CyclesToRun;
}
RunSystem(ndscyclestorun);
ndscyclesran += ndscyclestorun;
if (ndscyclesran >= cycles) break;
CalcIterationCycles();
}
}
@ -680,7 +695,7 @@ u32 RunFrame()
RunSystem(ndscyclestorun);
}
}
//printf("frame stallcnt: %d, %d cycles\n", stallcnt, stallcycle); stallcnt = 0; stallcycle = 0;
return GPU::TotalScanlines;
}
@ -849,7 +864,7 @@ void ResumeCPU(u32 cpu, u32 mask)
void GXFIFOStall()
{
if (CPUStop & 0x80000000) return;
stallcnt++;
CPUStop |= 0x80000000;
if (CurCPU == 1) ARM9->Halt(2);