project64/Source/Project64/N64 System/Mips/Dma.cpp

/****************************************************************************
*                                                                           *
* Project 64 - A Nintendo 64 emulator.                                      *
* http://www.pj64-emu.com/                                                  *
* Copyright (C) 2012 Project64. All rights reserved.                        *
*                                                                           *
* License:                                                                  *
* GNU/GPLv2 http://www.gnu.org/licenses/gpl-2.0.html                        *
*                                                                           *
****************************************************************************/
#include "stdafx.h"

CDMA::CDMA(CFlashram & FlashRam, CSram & Sram) :
	m_FlashRam(FlashRam),
	m_Sram(Sram)
{
	
}

void CDMA::OnFirstDMA()
{
	switch (g_Rom->CicChipID())
	{
	case CIC_NUS_6101: *(DWORD *)&((g_MMU->Rdram())[0x318]) = g_MMU->RdramSize(); break;
	case CIC_NUS_8303: *(DWORD *)&((g_MMU->Rdram())[0x318]) = g_MMU->RdramSize(); break;
	case CIC_UNKNOWN:
	case CIC_NUS_6102: *(DWORD *)&((g_MMU->Rdram())[0x318]) = g_MMU->RdramSize(); break;
	case CIC_NUS_6103: *(DWORD *)&((g_MMU->Rdram())[0x318]) = g_MMU->RdramSize(); break;
	case CIC_NUS_6105: *(DWORD *)&((g_MMU->Rdram())[0x3F0]) = g_MMU->RdramSize(); break;
	case CIC_NUS_6106: *(DWORD *)&((g_MMU->Rdram())[0x318]) = g_MMU->RdramSize(); break;
	default: g_Notify->DisplayError(L"Unhandled CicChip(%d) in first DMA",g_Rom->CicChipID());
	}
}

void CDMA::PI_DMA_READ()
{
//	PI_STATUS_REG |= PI_STATUS_DMA_BUSY;

	if ( g_Reg->PI_DRAM_ADDR_REG + g_Reg->PI_RD_LEN_REG + 1 > g_MMU->RdramSize()) 
	{
		if (bHaveDebugger())
		{
			g_Notify->DisplayError(L"PI_DMA_READ not in Memory");
		}
		g_Reg->PI_STATUS_REG &= ~PI_STATUS_DMA_BUSY;
		g_Reg->MI_INTR_REG |= MI_INTR_PI;
		g_Reg->CheckInterrupts();
		return;
	}

	if (g_Reg->PI_CART_ADDR_REG >= 0x10000000 && g_Reg->PI_CART_ADDR_REG <= 0x1FBFFFFF && g_Settings->LoadBool(Game_AllowROMWrites))
	{
		DWORD i;
		BYTE * ROM = g_Rom->GetRomAddress();
		BYTE * RDRAM = g_MMU->Rdram();

		DWORD OldProtect;
		VirtualProtect(ROM, g_Rom->GetRomSize(), PAGE_READWRITE, &OldProtect);

		g_Reg->PI_CART_ADDR_REG -= 0x10000000;
		if (g_Reg->PI_CART_ADDR_REG + g_Reg->PI_RD_LEN_REG < g_Rom->GetRomSize())
		{
			for (i = 0; i < g_Reg->PI_RD_LEN_REG; i++)
			{
				*(ROM + ((g_Reg->PI_CART_ADDR_REG + i) ^ 3)) = *(RDRAM + ((g_Reg->PI_DRAM_ADDR_REG + i) ^ 3));
			}
		}
		else
		{
			DWORD Len;
			Len = g_Rom->GetRomSize() - g_Reg->PI_CART_ADDR_REG;
			for (i = 0; i < Len; i++)
			{
				*(ROM + ((g_Reg->PI_CART_ADDR_REG + i) ^ 3)) = *(RDRAM + ((g_Reg->PI_DRAM_ADDR_REG + i) ^ 3));
			}
		}
		g_Reg->PI_CART_ADDR_REG += 0x10000000;

		if (!g_System->DmaUsed())
		{
			g_System->SetDmaUsed(true);
			OnFirstDMA();
		}
		if (g_Recompiler && g_System->bSMM_PIDMA())
		{
			g_Recompiler->ClearRecompCode_Phys(g_Reg->PI_DRAM_ADDR_REG, g_Reg->PI_WR_LEN_REG, CRecompiler::Remove_DMA);
		}

		VirtualProtect(ROM, g_Rom->GetRomSize(), PAGE_READONLY, &OldProtect);
	}

	if ( g_Reg->PI_CART_ADDR_REG >= 0x08000000 && g_Reg->PI_CART_ADDR_REG <= 0x08010000)
	{
		if (g_System->m_SaveUsing == SaveChip_Auto)
		{
			g_System->m_SaveUsing = SaveChip_Sram;
		}
		if (g_System->m_SaveUsing == SaveChip_Sram)
		{
			m_Sram.DmaToSram(
				g_MMU->Rdram() + g_Reg->PI_DRAM_ADDR_REG,
				g_Reg->PI_CART_ADDR_REG - 0x08000000,
				g_Reg->PI_RD_LEN_REG + 1
			);
			g_Reg->PI_STATUS_REG &= ~PI_STATUS_DMA_BUSY;
			g_Reg->MI_INTR_REG |= MI_INTR_PI;
			g_Reg->CheckInterrupts();
			return;
		}
		if (g_System->m_SaveUsing == SaveChip_FlashRam)
		{
			m_FlashRam.DmaToFlashram(
				g_MMU->Rdram()+g_Reg->PI_DRAM_ADDR_REG,
				g_Reg->PI_CART_ADDR_REG - 0x08000000,
				g_Reg->PI_RD_LEN_REG + 1
			);
			g_Reg->PI_STATUS_REG &= ~PI_STATUS_DMA_BUSY;
			g_Reg->MI_INTR_REG |= MI_INTR_PI;
			g_Reg->CheckInterrupts();
			return;
		}
	}
	if (g_System->m_SaveUsing == SaveChip_FlashRam) 
	{
		g_Notify->DisplayError(L"**** FLashRam DMA Read address %X *****",g_Reg->PI_CART_ADDR_REG);
		g_Reg->PI_STATUS_REG &= ~PI_STATUS_DMA_BUSY;
		g_Reg->MI_INTR_REG |= MI_INTR_PI;
		g_Reg->CheckInterrupts();
		return;
	}
	if (bHaveDebugger()) 
	{ 
		g_Notify->DisplayError(L"PI_DMA_READ where are you dmaing to ?");
	}
	g_Reg->PI_STATUS_REG &= ~PI_STATUS_DMA_BUSY;
	g_Reg->MI_INTR_REG |= MI_INTR_PI;
	g_Reg->CheckInterrupts();
	return;
}

void CDMA::PI_DMA_WRITE()
{
	DWORD PI_WR_LEN_REG = ((g_Reg->PI_WR_LEN_REG) & 0x00FFFFFFul) + 1;

	if ((PI_WR_LEN_REG & 1) != 0)
	{
		PI_WR_LEN_REG += 1; /* fixes AI Shougi 3, Doraemon 3, etc. */
	}

	g_Reg->PI_STATUS_REG |= PI_STATUS_DMA_BUSY;
	if ( g_Reg->PI_DRAM_ADDR_REG + PI_WR_LEN_REG > g_MMU->RdramSize()) 
	{
		if (g_Settings->LoadBool(Debugger_ShowUnhandledMemory)) { g_Notify->DisplayError(L"PI_DMA_WRITE not in Memory"); }
		g_Reg->PI_STATUS_REG &= ~PI_STATUS_DMA_BUSY;
		g_Reg->MI_INTR_REG |= MI_INTR_PI;
		g_Reg->CheckInterrupts();
		return;
	}

	if ( g_Reg->PI_CART_ADDR_REG >= 0x08000000 && g_Reg->PI_CART_ADDR_REG <= 0x08010000)
	{
		if (g_System->m_SaveUsing == SaveChip_Auto)
		{
			g_System->m_SaveUsing = SaveChip_Sram;
		}
		if (g_System->m_SaveUsing == SaveChip_Sram)
		{
			m_Sram.DmaFromSram(
				g_MMU->Rdram()+g_Reg->PI_DRAM_ADDR_REG,
				g_Reg->PI_CART_ADDR_REG - 0x08000000,
				PI_WR_LEN_REG
			);
			g_Reg->PI_STATUS_REG &= ~PI_STATUS_DMA_BUSY;
			g_Reg->MI_INTR_REG |= MI_INTR_PI;
			g_Reg->CheckInterrupts();
			return;
		}
		if (g_System->m_SaveUsing == SaveChip_FlashRam)
		{
			m_FlashRam.DmaFromFlashram(
				g_MMU->Rdram()+g_Reg->PI_DRAM_ADDR_REG,
				g_Reg->PI_CART_ADDR_REG - 0x08000000,
				PI_WR_LEN_REG
			);
			g_Reg->PI_STATUS_REG &= ~PI_STATUS_DMA_BUSY;
			g_Reg->MI_INTR_REG |= MI_INTR_PI;
			g_Reg->CheckInterrupts();
		}
		return;
	}

	if ( g_Reg->PI_CART_ADDR_REG >= 0x10000000 && g_Reg->PI_CART_ADDR_REG <= 0x1FBFFFFF) 
	{
	DWORD i;	

#ifdef tofix
#ifdef ROM_IN_MAPSPACE
		if (WrittenToRom)
		{ 
			DWORD OldProtect;
			VirtualProtect(ROM,m_RomFileSize,PAGE_READONLY, &OldProtect);
		}
#endif
#endif

		BYTE * ROM   = g_Rom->GetRomAddress();
		BYTE * RDRAM = g_MMU->Rdram();
		g_Reg->PI_CART_ADDR_REG -= 0x10000000;
		if (g_Reg->PI_CART_ADDR_REG + PI_WR_LEN_REG < g_Rom->GetRomSize())
		{
			for (i = 0; i < PI_WR_LEN_REG; i ++)
			{
				*(RDRAM+((g_Reg->PI_DRAM_ADDR_REG + i) ^ 3)) =  *(ROM+((g_Reg->PI_CART_ADDR_REG + i) ^ 3));
			}
		}
		else
		{
			DWORD Len;
			Len = g_Rom->GetRomSize() - g_Reg->PI_CART_ADDR_REG;
			for (i = 0; i < Len; i ++)
			{
				*(RDRAM+((g_Reg->PI_DRAM_ADDR_REG + i) ^ 3)) =  *(ROM+((g_Reg->PI_CART_ADDR_REG + i) ^ 3));
			}
			for (i = Len; i < PI_WR_LEN_REG - Len; i ++)
			{
				*(RDRAM+((g_Reg->PI_DRAM_ADDR_REG + i) ^ 3)) =  0;
			}
		}
		g_Reg->PI_CART_ADDR_REG += 0x10000000;

		if (!g_System->DmaUsed())
		{
			g_System->SetDmaUsed(true);
			OnFirstDMA(); 
		}
		if (g_Recompiler && g_System->bSMM_PIDMA())
		{
			g_Recompiler->ClearRecompCode_Phys(g_Reg->PI_DRAM_ADDR_REG, g_Reg->PI_WR_LEN_REG,CRecompiler::Remove_DMA);
		}
		g_Reg->PI_STATUS_REG &= ~PI_STATUS_DMA_BUSY;
		g_Reg->MI_INTR_REG |= MI_INTR_PI;
		g_Reg->CheckInterrupts();
		//ChangeTimer(PiTimer,(int)(PI_WR_LEN_REG * 8.9) + 50);
		//ChangeTimer(PiTimer,(int)(PI_WR_LEN_REG * 8.9));
		return;
	}
	
	if (g_Settings->LoadBool(Debugger_ShowUnhandledMemory)) { g_Notify->DisplayError(L"PI_DMA_WRITE not in ROM"); }
	g_Reg->PI_STATUS_REG &= ~PI_STATUS_DMA_BUSY;
	g_Reg->MI_INTR_REG |= MI_INTR_PI;
	g_Reg->CheckInterrupts();

}

void CDMA::SP_DMA_READ()
{ 
	g_Reg->SP_DRAM_ADDR_REG &= 0x1FFFFFFF;

	if (g_Reg->SP_DRAM_ADDR_REG > g_MMU->RdramSize()) 
	{
		if (bHaveDebugger()) 
		{ 
			g_Notify->DisplayError(__FUNCTIONW__ L"\nSP_DRAM_ADDR_REG not in RDRam space");
		}
		g_Reg->SP_DMA_BUSY_REG = 0;
		g_Reg->SP_STATUS_REG  &= ~SP_STATUS_DMA_BUSY;
		return;
	}
	
	if (g_Reg->SP_RD_LEN_REG + 1  + (g_Reg->SP_MEM_ADDR_REG & 0xFFF) > 0x1000) 
	{
		if (bHaveDebugger()) 
		{ 
			g_Notify->DisplayError(__FUNCTIONW__ L"\ncould not fit copy in memory segement");
		}
		return;		
	}
	
	if ((g_Reg->SP_MEM_ADDR_REG & 3) != 0)
	{
		g_Notify->BreakPoint(__FILEW__,__LINE__); 
	}
	if ((g_Reg->SP_DRAM_ADDR_REG & 3) != 0)
	{
		g_Notify->BreakPoint(__FILEW__,__LINE__); 
	}
	if (((g_Reg->SP_RD_LEN_REG + 1) & 3) != 0)
	{
		g_Notify->BreakPoint(__FILEW__,__LINE__); 
	}

	memcpy( g_MMU->Dmem() + (g_Reg->SP_MEM_ADDR_REG & 0x1FFF), g_MMU->Rdram() + g_Reg->SP_DRAM_ADDR_REG,
		g_Reg->SP_RD_LEN_REG + 1 );
		
	g_Reg->SP_DMA_BUSY_REG = 0;
	g_Reg->SP_STATUS_REG  &= ~SP_STATUS_DMA_BUSY;
}

void CDMA::SP_DMA_WRITE() 
{ 
	if (g_Reg->SP_DRAM_ADDR_REG > g_MMU->RdramSize()) 
	{
		if (bHaveDebugger()) 
		{ 
			g_Notify->DisplayError(L"SP DMA WRITE\nSP_DRAM_ADDR_REG not in RDRam space");
		}
		return;
	}
	
	if (g_Reg->SP_WR_LEN_REG + 1 + (g_Reg->SP_MEM_ADDR_REG & 0xFFF) > 0x1000) 
	{
		if (bHaveDebugger()) 
		{ 
			g_Notify->DisplayError(L"SP DMA WRITE\ncould not fit copy in memory segement");
		}
		return;		
	}

	if ((g_Reg->SP_MEM_ADDR_REG & 3) != 0)
	{
		g_Notify->BreakPoint(__FILEW__,__LINE__); 
	}
	
	if ((g_Reg->SP_DRAM_ADDR_REG & 3) != 0)
	{
		g_Notify->BreakPoint(__FILEW__,__LINE__); 
	}
	if (((g_Reg->SP_WR_LEN_REG + 1) & 3) != 0)
	{
		g_Notify->BreakPoint(__FILEW__,__LINE__); 
	}

	memcpy( g_MMU->Rdram() + g_Reg->SP_DRAM_ADDR_REG, g_MMU->Dmem() + (g_Reg->SP_MEM_ADDR_REG & 0x1FFF),
		g_Reg->SP_WR_LEN_REG + 1);
		
	g_Reg->SP_DMA_BUSY_REG = 0;
	g_Reg->SP_STATUS_REG  &= ~SP_STATUS_DMA_BUSY;
}