melonDS/src/DMA.h
2024-06-15 17:01:19 +02:00

108 lines
2.2 KiB
C++

/*
Copyright 2016-2024 melonDS team
This file is part of melonDS.
melonDS 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.
melonDS 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 melonDS. If not, see http://www.gnu.org/licenses/.
*/
#ifndef DMA_H
#define DMA_H
#include <array>
#include "types.h"
namespace melonDS
{
class NDS;
class Savestate;
class DMA
{
public:
DMA(u32 cpu, u32 num, NDS& nds);
~DMA() = default;
void Reset();
void DoSavestate(Savestate* file);
void WriteCnt(u32 val);
void Start();
u32 UnitTimings9_16(bool burststart);
u32 UnitTimings9_32(bool burststart);
u32 UnitTimings7_16(bool burststart);
u32 UnitTimings7_32(bool burststart);
void Run();
void Run9();
void Run7();
bool IsInMode(u32 mode) const noexcept
{
return ((mode == StartMode) && (Cnt & 0x80000000));
}
bool IsRunning() const noexcept { return Running!=0; }
void StartIfNeeded(u32 mode)
{
if ((mode == StartMode) && (Cnt & 0x80000000))
Start();
}
void StopIfNeeded(u32 mode)
{
if (mode == StartMode)
Cnt &= ~0x80000000;
}
void StallIfRunning()
{
if (Executing) Stall = true;
}
u32 SrcAddr {};
u32 DstAddr {};
u32 Cnt {};
private:
melonDS::NDS& NDS;
u32 CPU {};
u32 Num {};
u32 StartMode {};
u32 CurSrcAddr {};
u32 CurDstAddr {};
u32 RemCount {};
u32 IterCount {};
s32 SrcAddrInc {};
s32 DstAddrInc {};
u32 CountMask {};
u32 Running {};
bool InProgress {};
bool Executing {};
bool Stall {};
bool IsGXFIFODMA {};
u32 MRAMBurstCount {};
std::array<u8, 256> MRAMBurstTable;
};
}
#endif