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handle 'bad' dma better

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This commit is contained in:
notaz 2017-10-21 00:02:38 +03:00
parent ee5d41a1ed
commit eef77d7a8b
2 changed files with 11 additions and 8 deletions
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14
pico/videoport.c
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@ -100,7 +100,7 @@ static void DmaSlow(int len, unsigned int source)
Pico.video.type, source, a, len, inc, (Pico.video.status&8)||!(Pico.video.reg[1]&0x40),
SekCyclesDone(), SekPc);
Pico.m.dma_xfers += len;
Pico.m.dma_xfers = len;
if (Pico.m.dma_xfers < len) // lame 16bit var
Pico.m.dma_xfers = ~0;
SekCyclesBurnRun(CheckDMA());
@ -225,10 +225,10 @@ static void DmaCopy(int len)
int source;
elprintf(EL_VDPDMA, "DmaCopy len %i [%u]", len, SekCyclesDone());
Pico.m.dma_xfers += len;
Pico.m.dma_xfers = len;
if (Pico.m.dma_xfers < len)
Pico.m.dma_xfers = ~0;
Pico.video.status |= 2; // dma busy
Pico.video.status |= SR_DMA;
source =Pico.video.reg[0x15];
source|=Pico.video.reg[0x16]<<8;
@ -256,10 +256,10 @@ static NOINLINE void DmaFill(int data)
len = GetDmaLength();
elprintf(EL_VDPDMA, "DmaFill len %i inc %i [%u]", len, inc, SekCyclesDone());
Pico.m.dma_xfers += len;
Pico.m.dma_xfers = len;
if (Pico.m.dma_xfers < len) // lame 16bit var
Pico.m.dma_xfers = ~0;
Pico.video.status |= 2; // dma busy
Pico.video.status |= SR_DMA;
switch (Pico.video.type)
{
@ -306,6 +306,10 @@ static NOINLINE void CommandDma(void)
if ((pvid->reg[1]&0x10)==0) return; // DMA not enabled
if (Pico.m.dma_xfers)
elprintf(EL_VDPDMA|EL_ANOMALY, "Dma overlap, left=%d @ %06x",
Pico.m.dma_xfers, SekPc);
len = GetDmaLength();
source =Pico.video.reg[0x15];
source|=Pico.video.reg[0x16] << 8;