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some attempt at cart support

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This commit is contained in:
StapleButter
2017-01-22 20:34:59 +01:00
parent 62ed28d5c8
commit ac8936539e
9 changed files with 642 additions and 168 deletions
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16
DMA.cpp
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@ -19,6 +19,7 @@
#include <stdio.h>
#include "NDS.h"
#include "DMA.h"
#include "NDSCart.h"
// NOTES ON DMA SHIT
@ -82,7 +83,7 @@ void DMA::WriteCnt(u32 val)
if (CPU == 0)
StartMode = (Cnt >> 27) & 0x7;
else
StartMode = ((Cnt >> 28) & 0x3) | 0x8;
StartMode = ((Cnt >> 28) & 0x3) | 0x10;
if ((StartMode & 0x7) == 0)
Start();
@ -106,6 +107,19 @@ void DMA::Start()
if ((Cnt & 0x00060000) == 0x00060000)
CurDstAddr = DstAddr;
// special path for cart DMA. this is a gross hack.
// emulating it properly requires emulating cart transfer delays, so uh... TODO
if (CurSrcAddr==0x04100010 && RemCount==1 && (Cnt & 0x07E00000)==0x07000000 &&
((CPU==0 && StartMode==0x06) || (CPU==1 && StartMode==0x12)))
{
printf("CART DMA %08X\n", CurDstAddr);
NDSCart::DMA(CurDstAddr);
Cnt &= ~0x80000000;
if (Cnt & 0x40000000)
NDS::TriggerIRQ(CPU, NDS::IRQ_DMA0 + Num);
return;
}
//printf("ARM%d DMA%d %08X %08X->%08X %d bytes %dbit\n", CPU?7:9, Num, Cnt, CurSrcAddr, CurDstAddr, RemCount*((Cnt&0x04000000)?4:2), (Cnt&0x04000000)?32:16);
// TODO: NOT MAKE THE DMA INSTANT!!