pcsx2/pcsx2/Sif.h

190 lines
4.2 KiB
C++

/* PCSX2 - PS2 Emulator for PCs
* Copyright (C) 2002-2010 PCSX2 Dev Team
*
* PCSX2 is free software: you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* PCSX2 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 PCSX2.
* If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __SIF_H__
#define __SIF_H__
static const int FIFO_SIF_W = 128;
// psxdev: was here on the initial psx merge
//static u32 sif2fifostat = (u32&)eeHw[0xf380];
// Despite its name, this is actually the IOP's DMAtag, which itself also contains
// the EE's DMAtag in its upper 64 bits. Note that only the lower 24 bits of 'data' is
// the IOP's chain transfer address (loaded into MADR). Bits 30 and 31 are transfer stop
// bits of some sort.
struct sifData
{
s32 data;
s32 words;
tDMA_TAG tag_lo; // EE DMA tag
tDMA_TAG tag_hi; // EE DMA tag
};
struct sifFifo
{
u32 data[FIFO_SIF_W];
u32 junk[4];
s32 readPos;
s32 writePos;
s32 size;
s32 sif_free()
{
return FIFO_SIF_W - size;
}
void write(u32 *from, int words)
{
if (words > 0)
{
if ((FIFO_SIF_W - size) < words)
DevCon.Warning("Not enough space in SIF0 FIFO!\n");
if (size < 4)
{
u32 amt = std::min(4 - size, words);
memcpy(&junk[size], from, amt << 2);
}
const int wP0 = std::min((FIFO_SIF_W - writePos), words);
const int wP1 = words - wP0;
memcpy(&data[writePos], from, wP0 << 2);
memcpy(&data[0], &from[wP0], wP1 << 2);
writePos = (writePos + words) & (FIFO_SIF_W - 1);
size += words;
}
SIF_LOG(" SIF + %d = %d (pos=%d)", words, size, writePos);
}
void writeJunk(int words)
{
if (words > 0)
{
if ((FIFO_SIF_W - size) < words)
DevCon.Warning("Not enough Junk space in SIF0 FIFO!\n");
const int wP0 = std::min((FIFO_SIF_W - writePos), words);
const int wP1 = words - wP0;
memcpy(&data[writePos], &junk[4-words], wP0 << 2);
memcpy(&data[0], &junk[(4 - words)+wP0], wP1 << 2);
writePos = (writePos + words) & (FIFO_SIF_W - 1);
size += words;
}
SIF_LOG(" SIF + %d = %d (pos=%d)", words, size, writePos);
}
void read(u32 *to, int words)
{
if (words > 0)
{
const int wP0 = std::min((FIFO_SIF_W - readPos), words);
const int wP1 = words - wP0;
memcpy(to, &data[readPos], wP0 << 2);
memcpy(&to[wP0], &data[0], wP1 << 2);
readPos = (readPos + words) & (FIFO_SIF_W - 1);
size -= words;
}
SIF_LOG(" SIF - %d = %d (pos=%d)", words, size, readPos);
}
void clear()
{
memzero(data);
readPos = 0;
writePos = 0;
size = 0;
}
};
struct old_sif_structure
{
sifFifo fifo; // Used in both.
s32 chain; // Not used.
s32 end; // Only used for EE.
s32 tagMode; // No longer used.
s32 counter; // Used to keep track of how much is left in IOP.
struct sifData data; // Only used in IOP.
};
struct sif_ee
{
bool end; // Only used for EE.
bool busy;
s32 cycles;
};
struct sif_iop
{
bool end;
bool busy;
s32 cycles;
s32 writeJunk;
s32 counter; // Used to keep track of how much is left in IOP.
struct sifData data; // Only used in IOP.
};
struct _sif
{
sifFifo fifo; // Used in both.
sif_ee ee;
sif_iop iop;
};
extern _sif sif0, sif1, sif2;
extern void sifReset();
extern void SIF0Dma();
extern void SIF1Dma();
extern void SIF2Dma();
extern void dmaSIF0();
extern void dmaSIF1();
extern void dmaSIF2();
extern void EEsif0Interrupt();
extern void EEsif1Interrupt();
extern void EEsif2Interrupt();
extern void sif0Interrupt();
extern void sif1Interrupt();
extern void sif2Interrupt();
extern bool ReadFifoSingleWord();
extern bool WriteFifoSingleWord();
#define sif0data sif0.iop.data.data
#define sif1data sif1.iop.data.data
#define sif2data sif2.iop.data.data
#define sif0words sif0.iop.data.words
#define sif1words sif1.iop.data.words
#define sif2words sif2.iop.data.words
#define sif0tag DMA_TAG(sif0data)
#define sif1tag DMA_TAG(sif1data)
#define sif2tag DMA_TAG(sif2data)
#endif /* __SIF_H__ */