project64/Source/RSP/dma.c

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/*
* RSP Compiler plug in for Project 64 (A Nintendo 64 emulator).
*
* (c) Copyright 2001 jabo (jabo@emulation64.com) and
* zilmar (zilmar@emulation64.com)
*
* pj64 homepage: www.pj64.net
*
* Permission to use, copy, modify and distribute Project64 in both binary and
* source form, for non-commercial purposes, is hereby granted without fee,
* providing that this license information and copyright notice appear with
* all copies and any derived work.
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event shall the authors be held liable for any damages
* arising from the use of this software.
*
* Project64 is freeware for PERSONAL USE only. Commercial users should
* seek permission of the copyright holders first. Commercial use includes
* charging money for Project64 or software derived from Project64.
*
* The copyright holders request that bug fixes and improvements to the code
* should be forwarded to them so if they want them.
*
*/
#include <Windows.h>
#include <stdio.h>
#include "RSP.h"
#include "RSP Registers.h"
#include "memory.h"
// #define RSP_SAFE_DMA /* unoptimized dma transfers */
void SP_DMA_READ (void)
{
DWORD i, j, Length, Skip, Count, End, addr;
BYTE *Dest, *Source;
addr = (*RSPInfo.SP_DRAM_ADDR_REG) & 0x00FFFFFF;
if (addr > 0x800000)
{
MessageBox(NULL,"SP DMA READ\nSP_DRAM_ADDR_REG not in RDRam space","Error",MB_OK);
return;
}
if ((*RSPInfo.SP_RD_LEN_REG & 0xFFF) + 1 + (*RSPInfo.SP_MEM_ADDR_REG & 0xFFF) > 0x1000)
{
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MessageBox(NULL,"SP DMA READ\ncould not fit copy in memory segment","Error",MB_OK);
return;
}
Length = ((*RSPInfo.SP_RD_LEN_REG & 0xFFF) | 7) + 1;
Skip = (*RSPInfo.SP_RD_LEN_REG >> 20) + Length;
Count = ((*RSPInfo.SP_RD_LEN_REG >> 12) & 0xFF) + 1;
End = ((*RSPInfo.SP_MEM_ADDR_REG & 0x0FFF) & ~7) + (((Count - 1) * Skip) + Length);
if ((*RSPInfo.SP_MEM_ADDR_REG & 0x1000) != 0)
{
Dest = RSPInfo.IMEM + ((*RSPInfo.SP_MEM_ADDR_REG & 0x0FFF) & ~7);
}
else
{
Dest = RSPInfo.DMEM + ((*RSPInfo.SP_MEM_ADDR_REG & 0x0FFF) & ~7);
}
Source = RSPInfo.RDRAM + (addr & ~7);
#if defined(RSP_SAFE_DMA)
for (j = 0 ; j < Count; j++)
{
for (i = 0 ; i < Length; i++)
{
*(BYTE *)(((DWORD)Dest + j * Length + i) ^ 3) = *(BYTE *)(((DWORD)Source + j * Skip + i) ^ 3);
}
}
#else
if ((Skip & 0x3) == 0)
{
for (j = 0; j < Count; j++)
{
memcpy(Dest, Source, Length);
Source += Skip;
Dest += Length;
}
}
else
{
for (j = 0 ; j < Count; j++)
{
for (i = 0 ; i < Length; i++)
{
*(BYTE *)(((DWORD)Dest + i) ^ 3) = *(BYTE *)(((DWORD)Source + i) ^ 3);
}
Source += Skip;
Dest += Length;
}
}
#endif
/* FIXME: could this be a problem DMEM to IMEM (?) */
if (CPUCore == RecompilerCPU && (*RSPInfo.SP_MEM_ADDR_REG & 0x1000) != 0)
{
SetJumpTable(End);
}
*RSPInfo.SP_DMA_BUSY_REG = 0;
*RSPInfo.SP_STATUS_REG &= ~SP_STATUS_DMA_BUSY;
}
void SP_DMA_WRITE (void)
{
DWORD i, j, Length, Skip, Count, addr;
BYTE *Dest, *Source;
addr = (*RSPInfo.SP_DRAM_ADDR_REG) & 0x00FFFFFF;
if (addr > 0x800000)
{
MessageBox(NULL,"SP DMA WRITE\nSP_DRAM_ADDR_REG not in RDRam space","Error",MB_OK);
return;
}
if ((*RSPInfo.SP_WR_LEN_REG & 0xFFF) + 1 + (*RSPInfo.SP_MEM_ADDR_REG & 0xFFF) > 0x1000)
{
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MessageBox(NULL,"SP DMA WRITE\ncould not fit copy in memory segment","Error",MB_OK);
return;
}
Length = ((*RSPInfo.SP_WR_LEN_REG & 0xFFF) | 7) + 1;
Skip = (*RSPInfo.SP_WR_LEN_REG >> 20) + Length;
Count = ((*RSPInfo.SP_WR_LEN_REG >> 12) & 0xFF) + 1;
Dest = RSPInfo.RDRAM + (addr & ~7);
Source = RSPInfo.DMEM + ((*RSPInfo.SP_MEM_ADDR_REG & 0x1FFF) & ~7);
#if defined(RSP_SAFE_DMA)
for (j = 0 ; j < Count; j++)
{
for (i = 0 ; i < Length; i++)
{
*(BYTE *)(((DWORD)Dest + j * Skip + i) ^ 3) = *(BYTE *)(((DWORD)Source + j * Length + i) ^ 3);
}
}
#else
if ((Skip & 0x3) == 0)
{
for (j = 0; j < Count; j++)
{
memcpy(Dest, Source, Length);
Source += Length;
Dest += Skip;
}
}
else
{
for (j = 0 ; j < Count; j++)
{
for (i = 0 ; i < Length; i++)
{
*(BYTE *)(((DWORD)Dest + i) ^ 3) = *(BYTE *)(((DWORD)Source + i) ^ 3);
}
Source += Length;
Dest += Skip;
}
}
#endif
*RSPInfo.SP_DMA_BUSY_REG = 0;
*RSPInfo.SP_STATUS_REG &= ~SP_STATUS_DMA_BUSY;
}