mirror of https://github.com/PCSX2/pcsx2.git
153 lines
3.3 KiB
C
153 lines
3.3 KiB
C
/* PCSX2 - PS2 Emulator for PCs
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* Copyright (C) 2002-2010 PCSX2 Dev Team
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*
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* PCSX2 is free software: you can redistribute it and/or modify it under the terms
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* of the GNU Lesser General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with PCSX2.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __SIF_H__
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#define __SIF_H__
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static const int FIFO_SIF_W = 128;
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static DMACh& sif0dma = (DMACh&)eeHw[0xc000];
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static DMACh& sif1dma = (DMACh&)eeHw[0xc400];
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static DMACh& sif2dma = (DMACh&)eeHw[0xc800];
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// Despite its name, this is actually the IOP's DMAtag, which itself also contains
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// the EE's DMAtag in its upper 64 bits. Note that only the lower 24 bits of 'data' is
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// the IOP's chain transfer address (loaded into MADR). Bits 30 and 31 are transfer stop
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// bits of some sort.
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struct sifData
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{
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s32 data;
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s32 words;
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tDMA_TAG tag_lo; // EE DMA tag
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tDMA_TAG tag_hi; // EE DMA tag
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};
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struct sifFifo
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{
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u32 data[FIFO_SIF_W];
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s32 readPos;
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s32 writePos;
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s32 size;
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s32 sif_free()
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{
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return FIFO_SIF_W - size;
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}
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void write(u32 *from, int words)
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{
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if (words > 0)
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{
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const int wP0 = min((FIFO_SIF_W - writePos), words);
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const int wP1 = words - wP0;
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memcpy_fast(&data[writePos], from, wP0 << 2);
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memcpy_fast(&data[0], &from[wP0], wP1 << 2);
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writePos = (writePos + words) & (FIFO_SIF_W - 1);
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size += words;
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}
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SIF_LOG(" SIF + %d = %d (pos=%d)", words, size, writePos);
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}
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void read(u32 *to, int words)
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{
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if (words > 0)
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{
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const int wP0 = min((FIFO_SIF_W - readPos), words);
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const int wP1 = words - wP0;
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memcpy_fast(to, &data[readPos], wP0 << 2);
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memcpy_fast(&to[wP0], &data[0], wP1 << 2);
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readPos = (readPos + words) & (FIFO_SIF_W - 1);
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size -= words;
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}
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SIF_LOG(" SIF - %d = %d (pos=%d)", words, size, readPos);
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}
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void clear()
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{
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memzero(data);
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readPos = 0;
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writePos = 0;
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size = 0;
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}
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};
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struct old_sif_structure
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{
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sifFifo fifo; // Used in both.
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s32 chain; // Not used.
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s32 end; // Only used for EE.
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s32 tagMode; // No longer used.
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s32 counter; // Used to keep track of how much is left in IOP.
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struct sifData data; // Only used in IOP.
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};
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struct sif_ee
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{
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bool end; // Only used for EE.
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bool busy;
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s32 cycles;
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};
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struct sif_iop
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{
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bool end;
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bool busy;
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s32 cycles;
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s32 counter; // Used to keep track of how much is left in IOP.
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struct sifData data; // Only used in IOP.
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};
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struct _sif
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{
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sifFifo fifo; // Used in both.
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sif_ee ee;
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sif_iop iop;
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};
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extern _sif sif0, sif1;
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extern void sifInit();
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extern void SIF0Dma();
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extern void SIF1Dma();
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extern void dmaSIF0();
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extern void dmaSIF1();
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extern void dmaSIF2();
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extern void EEsif0Interrupt();
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extern void EEsif1Interrupt();
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extern void sif0Interrupt();
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extern void sif1Interrupt();
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#define sif0data sif0.iop.data.data
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#define sif1data sif1.iop.data.data
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#define sif0words sif0.iop.data.words
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#define sif1words sif1.iop.data.words
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#define sif0tag DMA_TAG(sif0data)
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#define sif1tag DMA_TAG(sif1data)
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#endif /* __SIF_H__ */
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