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DMA: Properly handle infinite linked lists, add cycle stealing

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Fixes Tekken 2, Hot Wheels Turbo Racing, probably others.
This commit is contained in:
Connor McLaughlin
2020-04-29 16:52:15 +10:00
parent 07e8ddcae2
commit 9d1eb321ec
5 changed files with 118 additions and 26 deletions
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16
src/core/dma.h
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@ -66,15 +66,19 @@ private:
// is everything enabled for a channel to operate?
bool CanTransferChannel(Channel channel) const;
bool IsTransferHalted() const;
void UpdateIRQ();
void TransferChannel(Channel channel);
// returns false if the DMA should now be halted
bool TransferChannel(Channel channel);
void HaltTransfer(TickCount duration);
void UnhaltTransfer(TickCount ticks);
// from device -> memory
void TransferDeviceToMemory(Channel channel, u32 address, u32 increment, u32 word_count);
TickCount TransferDeviceToMemory(Channel channel, u32 address, u32 increment, u32 word_count);
// from memory -> device
void TransferMemoryToDevice(Channel channel, u32 address, u32 increment, u32 word_count);
TickCount TransferMemoryToDevice(Channel channel, u32 address, u32 increment, u32 word_count);
System* m_system = nullptr;
Bus* m_bus = nullptr;
@ -84,7 +88,13 @@ private:
SPU* m_spu = nullptr;
MDEC* m_mdec = nullptr;
// configuration
TickCount m_max_slice_ticks = 1000;
TickCount m_halt_ticks = 100;
std::vector<u32> m_transfer_buffer;
std::unique_ptr<TimingEvent> m_unhalt_event;
TickCount m_halt_ticks_remaining = 0;
struct ChannelState
{